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|FPPh
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PrQP
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PrQP
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:&uvv` 	t|]	u	t 	3P(	-* ui%PvV
vV2ui6`#6^#vVFuN6p#6n#vvFt  ~9&X&&e%PFPWƋFv 2PP ]	9&X& & V\2PP ]	
:&u9&X& & ˎ9&X&&k%PFPVǋFvW	3^_]UWVF ǆP  Ɔ{ ǆ8o%:ǆ<w%>ǆ@~%BǆD%FǆH%J+NL9&
&
vx~prt89
+&G&n9&9ptH9&9vt= PP9&6&6` %P9&6&6Z T 
%P|	T:& P 	FVpP 	FV+FF{{<vv~ uZ6`#6^#%P~V P~V"P~VJ]	e never seen one.
   The rest of this list will not cover the 6152 machine.
   More information on the 6152 processor is covered in the AOS FAQ
   posting in this newsgroup.  The 6152 model was discontinued by IBM
   as of August 31, 1990.

   [ More details about the mysterious 6152 model RT would be intresting.
     How widespread is it?  History? Are any still running? - MW ]
 
   There are three versions of the 6150/6151 processor card, and several
   unique RT models using each version of the card.  IBM used the different
   model numbers to designate different base configurations of
   processor speed, installed main memory and installed hard disks. 
   Model numbers can be deciving, as some machines may have been
   field upgraded to different models and/or processor types.

   The standard 032 processor card was in models:
     10, 15, 20, 25 and A25.
      - 1MB memory was standard, with expansion available,
        via 1MB, 2MB or 4MB memory boards.
      - Optional Floating Point Accelerator was also available.
      - AIX 1.0 and 1.1 (RT version) initially shipped with these models.
      - 170ns processor cycle time.

      - The models 10, 20 and A25 were discontinued October, 1988.
      - The models 15, and 25 were discontinued May, 1990.

   The Advanced processor card was in 2 different types: 
     The 115 which had 4MB memory ON the processor card,
     available only on the desktop 6151.
     The 125 and B25 models which had all their memory on external
     FAST ECC 4MB memory cards, used in the 6150 tower models.
      - Memory expansion via 4MB FAST ECC memory boards.
      - Built in 20Mhz Motorola 68881 floating-point processor.
      - Optional Advanced Floating Point Accelerator was also available.
      - These models required AIX 2.1 as a mininum.
      - 100ns processor cycle time.

      - Later 8MB FAST ECC memory boards became available.
      - The models 115, 125 and B25 were discontinued May, 1991.

   The Enhanced Advanced processor card:
     Available only with the model 135 and B35 (6150 tower), and with
     the model 130 (6151 desktop).
      - On-board 16 MB main memory standard.
      - Motorola 68881 was removed and the Enhanced Advanced Floating
          Point Accelerator was made a standard feature.
      - These models required AIX 2.2 as a mininum.
      - 80ns processor cycle time. (Much faster!)
      - Rated by IBM at 5.6 Mips.
      - The models 130, 135 and B35 were discontinued May, 1991.

   Enhanced Advanced processors are easily recognized. Soldered directly
   to the processor board are 20 'SIMM like' memory boards sticking up on
   about 1/2 of the processor card.  All processor cards are installed
   in the special board slot labeled 'A'.

   The A## and B## model machines shipped without the native keyboard, and
   instead used a preinstalled 5080 attachment interface card allowing the
   RT processor to share the keyboard that was attached to the 5080
   graphics system hardware.  Via a special interface card, the 5080
   lighted program function keypad (LPFK) and dials unit (three variable
   position X,Y and Z controls) could be attached either to the RT or
   the 5080 graphics system.  Primarly used in a CADAM and CATIA setup
   running AIX.

   System processor board timings:
        Board            Bus Cycle time      Memory Bandwith
                         (nanoseconds)       (Megabytes/second)
        Original 032         170                    23.5
        Advanced             100                    40
        Enhanced Advanced     80                    50

-------------------------
H.3 - How fast are the different models of RT?

    [ I would like to see some results from users with later benchmark 
      tests on both the native C and Fortran compilers. 
      Tests with a 135 processor using the last available compiler patches
      from IBM, and side-by-side tests with the now available GCC compiler
      for AIX RT would be an intresting addition to this section. 
      I would like to see how those compilers stack up to each other 
      in performance tests.  I would also like to see how the RT still
      stands using some of the newer industry standard benchmark programs.
      Comparisons against other popular processors now in use would be
      intresting.  This information may be dated, considering that IBM
      continued to improve the performance of the native C compiler 
      available with the AIX V2 operating system.

      Comparison running AOS or MACH would also be intresting to see how
      much difference compiler and OS technology has on overall performance.
      Challenge anyone?  - MW ]

    Note: These performance numbers are dependent on various factors,
          including complier update levels, language, Fortran or C,
          compiler options, and instlled floating point accellerators.
          Times given are using the AIX operating system. 
          These numbers were obtained from an IBM announcement letter 
          number 188-120 Dated July 19, 1988, announcing the release
          of the 135 Enhanced Processor. 
          Refer to that IBM announcement for more complete information.

   Test                         Jan 86          Feb 87          July 88
   =====================+===================================================
   Dhrystones           |       1780            6500             8300 (1)
                        |                                       10400 (2)
   =====================+===================================================
   FP KWhetstones       |
    (double precision)  |
        Standard        |       20K             810K            2020K
        Optional        |       200K            1600K           N/A
   =====================+===================================================
   LINPACK KFlops       |
    (double precision)  |
        Standard        |       --              80K             410K
        Optional        |       37K             300K            780K (3)
   =====================+===================================================
   Disk Maximum         |
     - Capacity         |       210Mb           5810Mb          7460Mb
     - Data Rate        |
       (Mbytes/sec)     |       0.26            1.08            1.08 (4)
   =====================+===================================================
   Notes: (1) Benchmark run on an RT System model 125.
          (2) Benchmark run on an RT System model 135.
          (3) Using specially coded basic linear algebra subprograms.
          (4) 310 Meg Fixed disk has a 928 Kbps data rate.

    The date in the columns above refer to IBM announcement letters 
    for the RT, released on the the date indicated.

    Jan 86   generally refers to the Standard 032 processor
             available with models 10, 15, 20, 25 and A25.
    Feb 87   generally refers to the 115 and 125 models and AIX V2.1
             enhancements.
    July 88  refers to the announcment of the 130, 135 and B35 models,   dismantled.  ANS/Merit could probably give you more details on when this
   switchover occurred, but I believe that November 1992 was one of the
   official changeover dates.

   ==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==
   Submitter: <gerald@vnet.IBM.COM> (Gerald Oskoboiny)
     Last night I was reading "Computer Wars" by Charles H. Ferguson and
     Charles R. Morris (ISBN 0812921569, Random House, 1993), and it has
     the code names of the RT and other projects. I forget most of the details,
     but it is very interesting reading. It explains how IBM had RISC
     technology in 1968 but mismanaged it until the disappointing RT was
     released in 1986.  As far as "history of the RT" goes, this book explains
     it all. 

   ==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==
   Submitter: mike@neutron.amd.com (Mike Johnson)
   Newsgroup: comp.arch    Subject: Re: First Commercial RISC Computer

    That's Research OPD Mini Processor.  OPD = Office Products Division.

    ROMP was originally designed to be used in office products, primarily
    text editing systems such as the IBM Office System/6 and DisplayWriter.
    The architectural work started in late spring of 1977, as a spin-off of
    the T.J. Watson Research 801 work (hence the "Research" in the acronym).
    Most of the architectural changes were for "cost reductions," such as
    adding 16-bit instructions for "byte-efficiency"--a main concern at IBM
    at the time.

    The first chips were working in early 1981.  The delay from architecture
    to working chips was caused mainly by building two models of the chip in
    TTL: an emulator that just executed the instruction set and a
    nodal-equivalent model that was more-or-less an exact duplicate of the
    chip (about 6000 7400-series DIPs plus a number of IBM bipolar gate
    arrays and static RAMs).  The delay was also caused by two major revs to
    the architecture: one change to a 32-bit architecture from a 24-bit
    architecture (I'm serious), and another to support demand paged
    virtual memory (the implementation supported out-of-order loads, so
    precise interrupts were hard to come by).

    ROMP was arguably the first working commercial RISC.  The arguments
    would be over whether or not it was a "true" RISC and whether or not
    one could count it as a commerial product in 1981, since it didn't
    actually ship until 1986.  *This* delay, in my opinion, was caused by
    overly ambitious software plans, in the form of porting an IBM version
    of UNIX to a virtual software layer called VRM (Virtual Resource
    Manager), rather than porting Berkeley UNIX directly to the hardware.
    The path from having hardware to developing VRM to porting UNIX and
    then getting VARs to write applications was just too long--a problem
    that IBMs resources couldn't overcome.

    I was the first member of the ROMP design team--something I credit to 
    random chance rather than any personal expertise (my graduate work 
    at the time had been in digital control systems).  ROMP was a good way
    to learn microprocessor design by learning what *not* to do.

    I understand that ROMP was also used in an IBM laser printer, but I
    don't have any first-hand knowledge that this is true.
   ==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==

-------------------------
H.2  - What types of processors were made?

   There are 2 basic types of machines called an RT.
   The tower model, IBM machine number 6150.
   The desktop model, IBM machine number 6151.

   There exists a special version machine that used the same processor,
   available only to educational sites that is a hybrid IBM PS/2 model 60
   with a special mirco-channel board version of the 032 processor, 
   dubbed as a 'crossbow' board. [project name? -MW]
   That machine was IBM machine number 6152.  The 6152 ran only the AOS
   operating system downloaded from another IBM 6150 or 6151 also running
   AOS, via a lan TCP/IP interface (either Token-ring or Ethernet).
   Later versions of AOS could be loaded directly on the 6152 once larger
   hard disk drives for PS/2 became available.
   The availablity of support for VGA adapters in the X11 releases was because
   of the existance of this machine.

   I am not sure the 6152 machine can rightly be called an RT, as the
   only interface boards used were the same as used in PS/2 machines.
   This version may be somewhat rare, and I havserial numbers BELOW
   a selected value were a different upgrade.  However, the upgrade
   announcement letter (187-022) does NOT mention a planar upgrade in
   its text.

   The only planar problem I know of was with REAL old model RT's not
   working with ethernet adapters.. here is a cut of the 6150 model
   hardware information..dated Feb 26, 1991.

   ================= start cut of IBM info ===============================
   Hardware Requirements:  The Baseband Adapter will plug into any model of the
   6150 and 6151 system units.
 
   Software Requirements:  This product requires that the RT AIX Operating
   System Version 1.1 (59X8994) be installed.
 
   Limitations:  The Baseband Adapter must NOT be plugged into slot 8 on the
   6150 Models 020, 025, and A25, or slot 5 on the 6151 Model 010.
 
   Planar must be at, or higher than, EC A31282M on the 6150 Models 020, 025,
   and A25, or EC A31283M on the 6151 Model 010.  If the customer serial number
   is 3500 or lower on Models 020, 025, and A25, or lower than 2250 on Model
   010, have them contact IBM for an upgraded planar board.  There will be an
   "Attention" card placed in each Baseband Adapter box.  The upgraded planar
   board will be installed at no charge to the customer.
   ================= end cut of IBM info ===============================
 
   [ I am still searching for more complete upgrade information. 
     IBM had some specific minimum planar serial numbers that
     were required for the faster processors, but I do not have
     any of that information.  Anybody? - MW ]

-------------------------
H.5 - How can I tell what kind of processor type is installed?

    For a quick determination of the processor type, observe the LED digits
    during a power on IPL.  The general sequence for initial 'Power On 
    Self Tests' (POST) codes is:
       88, xx, zz, yy, 09, 10, 14 (long), 15, 16, 21, 22

    The XX, YY and ZZ LED values will have a value of:
        XX  YY  ZZ
        01  03  05  = Standard 032 processor. (010,020,025,A25)
        1c  3c  5c  = Advanced 032 processor. (115,125 and B25)
        1u  3u  5u  = Enhanced Advanced 032 processor. (130,135,B35)

    The XX and YY codes stay around the longest, and are easiest to see.
    A few other codes fly by as well, but try as I could, I could not
    tell what they were.  Other codes can show up, depending on what other
    I/O boards are found in the system during power up.  If any code 
    remains in the LED display for over 5 minutes, a failure had been found
    with the system during self tests.  All LED codes after the code 22
    (boot record processing), are dependent on the operating system being
    loaded into the RT.  LED codes prior to the 22 are placed in the LED
    display by the Power On Self Tests (POST) of the RT planar.  Almost
    all the other LED codes are displayed by Loadable POST (LPOST) routines
    invoked during VRM initialization and IPL.  Obviously systems NOT 
    running AIX with VRM will have different LED codes.

-------------------------
H.6 - Where can I get parts for RT systems?

    [ This section needs more entries, addresses and/or phone numbers.
      Third party suppliers or used equipment dealers known to deal 
      in RT hardware would be great. - MW ]

    Parts at this time are still available from IBM. 
    At this time, IBM does not have any announced discontinuance of 
    individual parts.

    As of September 15, 1993, IBM has announced (letter 193-161 dated
    June 15, 1993) discontinuance of selling all the different monitors
    (6153, 6154, 6155, 5081) and some of the external perheriperials 
    (6156, 6192).  The 6157 tape drive was discontinued earlier in the
    year.

    IBM still offers maintence contracts for RT computers and equipment.

    IBM parts may be ordered by calling IBM-Direct, 1-800-426-2468.

        Other IBM numbers:
        1-800-426-7378  Service/Maintenance
        1-800-426-2468  Supplies/Dealer Referral
        1-800-426-3333  Information

    However, IBMs prices may be a little steep.

    Some used and surplus parts houses from time to time get RT systems,
    but not on any regular basis.  Lots of times, they are broken up for
    some of the re-usable parts, and the rest junked. :-(

    Dickens Data Systems used to make special 8, 16 and 64 port async 
    adapters for RT systems. They also sold device drivers for various SCSI
    attached devices, including 9-track tape.  I am not sure if they
    still make any of these.

   ==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==
   Submitter:  rrogers@chinet.chinet.com (Richard Rogers)

       [ I have made a few editorial changes and corrections to
         Richards submission, mostly phone number corrections or
         address/contact corrections. - MW ]

   In searching for a source of RT Megapel cards I put a call out over the
   net for RT parts sources and said that I would summarize back to the net.
   Two responses were received, so a personal thank you to Jon Brinkmann and
   Matt Rush. All leads were contacted with the following results:

        Dickens Data Systems      1-800-848-6177
                Don't inventory RT parts, but do have some RT
                add in hardware and software.

        Dickens Technologies      404-418-0630
                Carry all parts.

           From: woody@dickens.com (Mike (Woody) Woods)
           Subject: Re: RT Products
           Date: Thu, 30 Dec 93 15:14:20 EST
     
           > Inclosed Prices for I/O Boards for the RT 
           P/N     Desciption        Current Stock St      List Price
           10011   64 Port Controller    5 in stock        $1,000.USD,
                   for RT
           10012   16 Port Cluster Box   10+ in stock      $1,295.USD
         
           10001   8 Port board Plus for  1 in stock       $1,395.USD 
                   RT DB25
           10003   16 Port board RJ45 RT  16 in stock      $2,195.USD
           10003DB 16 Port board DB25 RT   7 in stock      $2,895.USD
     
           NOTE: On hard Drives RT 310 -- out of stock -- don't know if I
                 can get any more.

        Next Generation Systems   313-435-5086
        Contact: Randy Hastings

        Alpine Computer Sales
        P.O. Box 1500
        1052 Hwy 395
        Gardnerville, NV  89410
        (800) 274-5876
                Carry all parts.

        International Data Products
        4445 W. 77th St.
        Mpls, MN  55435
        (714) 851-0222
                Don't inventory RT parts any longer.

        RGdata Inc.
        975 Jefferson Road
        Rochester, NY  14623
        (716) 424-7500
                Carry all parts.
                Contact: Dave Gerritsen

        Dempsey Business Systems
        18377 Beach Blvd., Suite 323
        Huntington Beach, CA  92648
        (800) 637-2620
                Carry all parts, "large quantity".
                Contact: Steve


    We purchased purchased 5 cards and cables from Dave Gerritsen at RGdata.
    Everything arrived OK. We've had good experiences with RGdata in the past,
    I just didn't realize that they carried RT parts.
   ==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==

-------------------------
H.7 - What adapter cards are supported in an RT?

      The IBM RT has what is called in the industry a ISA bus.  Based on
      the original IBM PC AT bus in design, the RT has 8 I/O slots in the
      tower (6150 model), and 6 slots in the desktop (6151 model).
      Slot 3 and 6 on the tower model and slot 1 on the desktop models are
      eight bit style slots.  Slot 8 on the tower and slot 5 on the desktop
      model are wired slightly different than standard.

      Technically, any adapter that conforms to ISA standards would work
      provided there are appropiate device drivers AND no conflicts with
      existing adapter registers and bus addresses.

      The RT diagnostics program disks are unfortunately rather particular
      about OEM cards that emulate IBM adapters.  This can sometimes lead
      to problems running diagnostics, where the system MAY otherwise run
      fine with the regular operation system.
 
      NOTE: See the OS dependent FAQ list for additional hardware that
            may be supported by that operating system.  The information
            and part numbers shown below generally reflect AIX usage.

      Feature code numbers and part numbers, where known, are shown in
      parenthesis like this (#feature,partnum).  Part numbers DO change
      with EC (Error Correction) changes and production run changes. 

      [ These numbers should be able to be cross-referenced if no longer
       correct. - MW ]

        Memory cards -
           - For Model 10,15,20,25,and A25.
             * 1Mb Memory Expansion  (#8222,6848223)
             * 2Mb Memory Expansion  (#4739,6299228)
             * 4Mb Memory Expansion  (#3156,61X6157)
           - For Models 115,125 and B25 only
                (for use with RT PC Advanced Processor Board 08F3639 only)
             * 4Mb Fast Memory Expansion  (#7004,61X7005)
             * 8Mb Fast Memory Expansion  (#7008,61X7009)

           - Clearpoint Systems made memory cards for RT systems
             * 8Mb Fast Memory 
                [ Need address/phone number of Clearpoint - MW ]

           - Note: The model 130,135 and B35 are at their maximum
             16MB of memory soldered on the processor card.

        Perhiperial adapters -
         * Small Computer System Interface Adapter  (#7000,61X7001)
           - Fuse 1.0A 250V  (0855253)

        Fixed Disk adapters -
         * PC AT Fixed Disk and Diskette Drive Adapter  (#3428,79X3431)
         * ESDI Magnetic Media Adapter  (#6341,00F2160)
         * RT PC Extended ESDI Magnetic Media Adapter  (#????,08F3766)
         * RT PC Portable ESDI Magnetic Media Adapter  (#3506,08F3506)
           (usable only in models 115/130/125/135/B25/B35)

        Tape Drive adapter -
         * RT PC Streaming Tape Drive Adapter  (#4797,6299222)

        Display Adapters -
         * IBM Monochrome Display and Printer Adapter (#4900,8529148)
         * IBM PC Enhanced Graphics Adapter [EGA] (8654215)
           - IBM PC Graphics Memory Expansion Card (6323468)
           - 640 x 350 pixels,  16 colors, with color display.
           - 640 x 350 pixels,  16 grey level with monochrome display.
         * RT PC Advanced Monochrome Graphics Display Adapter (00F2357)
           - 720 x 512 pixels,   2 colors
         * RT PC Extended Monochrome Graphics Display Adapter (6299351)
           - 1024 x 768 pixels,  2 colors
         * RT PC Advanced Color Graphics Display Adapter (00F2350)
           - 720 x 512 pixels,  16 colors from palette of 64 colors.
         * Megapel Display Adapter (#7658)
           - has two boards fastened together
             - Display Controller (6247666 or 6247529)
             - Display Processor  (6247662)
           - 1024 x 1024 pixels,  256 colors from palette of 4096 colors.
                using the 5081 model 12, 16 or 19.
           - 1024 x 1024 pixels    16 grey levels on the 5081 model 11
             monochrome display.

        Communication adapters - 
         * RT PC 4-Port Asynchronous RS-232C Adapter (UN-Buffered) 
             (#4763,???????)
         * RT PC 4-Port Asynchronous RS-422A Adapter (UN-Buffered) 
             (#4764,???????)
         * RT PC 4-Port Asynchronous RS-232C Adapter (Buffered) 
             (#1356,61X6339)
         * RT PC 4-Port Asynchronous RS-422A Adapter (Buffered) 
             (#1357,79X3782)
         * IBM PC AT Serial/Parallel Adapter (#0215,8286147)
         * IBM PC 3278/79 Emulation Adapter  (long)  (#????,???????)
                 (Early version is long, and only one may be installed, 
                  and has no switches to alter memory addresses.)
         * IBM PC Advanced 3278/79 Emulation Adapter  (#5050,8665792)
                 (later version is short, has switches, and a maximum
                  of 4 may be installed.)
         * IBM PC Network Adapter - discontinued 07/88. (#0213,8286171)
         * IBM Token-Ring Network RT PC Adapter (#3797,67X0432) Early version
         * IBM Token-Ring Network RT PC Adapter (#3797,69X8142) Late version
         * RT PC Multiprotocol Adapter (#4762,08F3193)
         * RT PC Baseband Adapter [Ungerman-Bass Ethernet] (#6810,61X6809)
         * 8-Port Asynchronous Mil-Std 188 Adapter (#3169,08F3170)
         * 8-Port Asynchronous RS-232-C Adapter (#3165,08F3166)
         * 8-Port Asynchronous RS-422-A Adapter (#3171,08F3172)

        Special -
         * RT PC Floating-Point Accelerator (#4758,6299220)
           (for use with RT PC Processor board 79X3766 only)                 
         * Advanced Floating-Point Accelerator [115,125,B25 only]
           Note: There are two versions of this card:
             - level 1 (#6814,61X6814) (bar code A117Kxxxxxx) can be used with
               either the original processor board (P/N 79X3766), or the
                   Advanced Processor board (P/N 08F3639).
             - level 2 (#6815,08F3589) (bar code A1206xxxxxx) 
               use with RT PC Processor Board 79X3766, or               
               RT PC Advanced Processor Board 08F3639, or              
               RT PC Enhanced Advanced Processor Board 08F3587.                
         * Enhanced Advanced Floating-Point Accelerator [130,135,B35 only]
                (#6815,???????) [is this the level 2 board? - MW]
         * Personal Computer AT Coprocessor Card (#4756,6299226)
           - AT Math processor chip [80287], (#0211,8286127)
         * 5080 Peripheral Adapter (#7561,6487562)
           - used to attach the 5085 dials feature and the 5085 Lighted
             Program Function Keyboard feature.
             Identifyable by the three 10-pin MODU connectors
         * 5080 Attachment Adapter (#7860,6247851)
           - used to attach the RT processor to the 5085 Graphics processor.
         * 5086 Model 1 Attachment Adapter (#7876,???????)
         * S/370 Host Interface Adapter (#7893,6247891)
           - used to connect the RT processor to the IBM 5088 graphics
             controller.
         * Expansion unit adapter (#3540,08F3727)
           - used to attach the RT PC 6192 expansion unit.
         * IBM Personal Pageprinter adapter RT edition (#2400, 06F2400)
           [No longer available as of September 6, 1989]
           - Provides the capability to attach an IBM  4216-020 printer,
             and is the postscript engine for the printer.
           - Occupies two adjoining slots.
           - Requires the RT Pageprinter Software package to operate.

-------------------------
H.8 - What IBM perhiperials were available?

    There may be other devices supported by other operating systems. 
    Refer to the one of the OS specific FAQ lists for more information. 
    The following IBM peripheral devices were officially supported by
    IBM for use on the 6150 and 6151:
        [ Feature code numbers and part numbers, where known, are shown
          in parenthies like this (#feature,partnum) - MW ]
 
    Storage Devices -
      Floppies:
        *   IBM PC AT High-Capacity Diskette Drive (68X3752)
        *   IBM PC AT Dual-Sided Diskette Drive (68X3753)
      Fixed Disk drives -
        *  40Mb Fixed Disk Drive [ R40 ] (#4735,6299235)
        *  70Mb Fixed Disk Drive [ R70 ] (#6941,61X6942)
        *  70Mb Extended ESDI Fixed Disk Drive [ E70 ] (#3988,79X3989)
        * 114Mb Extended ESDI Fixed Disk Drive [ E114 ]
            (#3272,00F2272 or 00F2273)
        * 310Mb Extended ESDI Fixed Disk Drive [ E310 ] (#3310,08F3358)
        * 310Mb Extended ESDI Fixed Disk Drive [ H310 ] (#3310,08F3358)
              [ this drive is really a Maxtor XT-4380E, with a minor
                modification for what Maxtor calls a 'short index pulse' ]

        * IBM 9332 DASD Models 240, 250, 440, and 450
        * IBM 9309 Rack Enclosure Models 1 and 2

        * IBM 6156-1 Portable Disk drive enclosure (1 drive bay).
          - No longer available new as of Sept 15, 1993.
        * IBM 6156-3 Portable Disk drive enclosure (3 drive bays).
          - No longer available new as of Sept 15, 1993.

      Tape Devices -
        * IBM 6157-001 Streaming Tape Drive (QIC 24) 
        * IBM 6157-002 Streaming Tape Drive (QIC 150)

    Displays -
        * IBM 5151 Personal Computer Display [PC XT monochrome display]
            (8529171 - low voltage 120VAC)
            (8529209 - high voltage - 220VAC )
        * IBM 5154 Personal Computer Enhanced Color Display [ EGA ]
            (6321035 - model 1 low voltage)
            (6321049 - model 2 high voltage Northern Hemisphere)
            (6321036 - model 3 high voltage Southern Hemisphere)
        * IBM PC Display Stand (#????) (for EGA display)
        * IBM 5081 Display Models 11, 12, 16, and 19
        * IBM 6153 Advanced Monochrome Graphics Display  
          - No longer available new as of Sept 15, 1993.
            (6299240 - 120VAC 50/60 Hz.)
            (6299241 - 220VAC 50/60 Hz.)
        * IBM 6154 Advanced Color Graphics Display 
          - No longer available new as of Sept 15, 1993.
            (6848113 - 120VAC 50/60 Hz. group 1) 
            (6848114 - 120VAC 50/60 Hz. group 2)
            (6848115 - 120VAC 50/60 Hz. group 3)
            (6848116 - 220VAC 50/60 Hz. group 1)
            (6848117 - 220VAC 50/60 Hz. group 2)
            (6848118 - 220VAC 50/60 Hz. group 3)
            (6848119 - 220VAC 50/60 Hz. group 4)
           [ what do the group numbers mean?  Power connector style? - MW ]
        * IBM 6155 Extended Monochrome Graphics Display
          - No longer available new as of Sept 15, 1993.
            (6848215 - 120VAC 50/60 Hz.)
            (6848216 - 220VAC 50/60 Hz.)
        * MONITERM monitor VY-6155.  19 inch Black and White display.
            - attaches via the Extended Monochrome Graphics adapter.
          [ Moniterm Corp.'s address and information needed. - MW ]

    Pointing devices -
        *  IBM 5083 Tablet Models 11 and 12 (NO LONGER AVAILABLE)
        *  IBM 5083 Model 11A tablet. (6248516)
        *  IBM 5083 Model 12A tablet. (6248515)
        *  IBM Mouse (#8426,00F2384)  Also called a 6100 pointing device.

    Special devices -
        *  IBM 5085 Lighted Program Function Keyboard (#4710,6246899)
        *  IBM 5085 Dials (#8710,6248436)
        *  IBM 5085 Graphic display system.
        *  IBM 5082 Color Projector Model 1
        *  IBM 5087 Screen Printer

    Printers -
        *  IBM 3852 Model 2 Color JetPrinter
        *  IBM 4202 Proprinter XL
        *  IBM 5842 Modem
        *  IBM 6184 Color Plotter
        *  IBM Pageprinter (3812). 
           (Requires special RT font diskette, #3065 on 3812.)
        *  IBM Pageprinter 4216 model 020
           (Requires special RT Adapter and Pagepritner software for
attachment)
        *  IBM Pageprinter 4216 model 030
           (Attaches via standard serial or parallel port)
        *  IBM 5201 QUIETWRITER Printer, Models 1 and 2
           (Model 2 supported in character mode and 5152 compatible 
            graphics mode only).
        *  IBM 4201 Proprinter
        *  IBM 5152 Graphics Printer (NO LONGER AVAILABLE)
        *  IBM 5182 Color Printer (NO LONGER AVAILABLE)
        *  IBM 6180 Color Plotter Model 1
        *  IBM 7371 Color Plotter
        *  IBM 7372 Color Plotter
        *  IBM 7374 Color Plotter
        *  IBM 7375 Color Plotter Model 1 and 2
        *  IBM PC Printer Stand (#5614)
  
    ASCII Terminal devices -
        * IBM 3151 and IBM 3161 ASCII Display Station
        * IBM 3162 and IBM 3163 (in 3161 mode).
        * ASCII terminals that adhere to ANSI 3.64 protocol as implemented
           by DEC VT100 and DEC VT220 (tm) or equivalent.
           VT-100 and VT-220 are Registered Trademarks of Digital
           Equipment Corporation.

-------------------------
H.9 - What cables are available?

      Feature codes, where known are listed like this (#xxxx).

      Part Num  Description
      ========  ====================================================
      61X6937   Cable, fixed-disk and diskette drive positions A-D 
      79X3777   Cable, fixed-disk and diskette drive positions A-E 
      6298359   Cable, power distribution.
      6450217   PC AT Communications Cable (#0217) 
                (3 Meters 9-pin to 25 pin)
      6450242   IBM PC AT Serial Adapter Connector Cable (#0242)
                (10-inch  DB 9-pin to 25 pin)
      79X3914   RS232 Terminal attach cable. (#????)
                (3 meters 10-pin MODU to DB25 pin MALE
                 use with 8-port, 4-port or native serial ports)
      6298526   RS232 Terminal attach cable. (#3913)
                (3 meters 10-pin MODU to DB25 pin FEMALE
                 use with 8-port, 4-port or native serial ports)
      6298525   RS232 Serial Printer attach cable.
                (3 meters 10-pin MODU to DB25 pin FEMALE
                 use with 8-port, 4-port or native serial ports)
      6294704   RS232 Modem attach cable.
                (3 meters 10-pin MODU to DB25 pin MALE
                 use with 8-port, 4-port or native serial ports)
      1525612   IBM PC Printer Cable (#5612)
      79X3468   SCSI interface card to device cable (#3468) (8 Meters)
                Includes Terminator plug 79X3795.
      79X3470   SCSI device to device cable (#3470) (1 Meter)
      6294812   Modem Cable RS232C for Multi-Protocol adapter
                ( 3 meters 16 Pin MODU to DB25 male )
      6294814   Autocall Cable RS366 for Multi-Protocol adapter
                ( 3 meters 16 Pin MODU to DB25 male )
      6294816   Modem Cable X.21 for Multi-Protocol adapter
                ( 3 meters 16 Pin MODU to 15 pin male )
      08F3157   8-Port RS232C Fan-out cable assembly (#3157)
                ( 6 foot cable to fanout box with 8 10-pin MODU connectors)
                (also used with MIL-188 adapter)
      08F3158   8-Port RS422A Fan-out cable assembly (#3158)
                ( 6 foot cable to fanout box with 8 6-pin MODU connectors]
      6487586   RT PC 5083 Tablet cable kit. (#7586)
                - used only to attach a model 1 or 2 tablet to an RT.
                  not needed for 11A or 12A tablets.
      6487563   RT PC 5080 Peripheral Adapter cable kit
      6247861   RT PC 5080 Attachment cable kit. (#7861)
                Includes two cables, terminator, diskettes and documentation. 
      22F9207   RT PC Expansion unit cable, 2m.

-------------------------
H.10 - What is the pinout of the 6150 serial ports?
       How do I make my own RS232 cables compatible for use with AIX?

    The funny connector on the back of the 6150 labeled 'S1' and 'S2'
    are the native serial ports built into the system planar board
    of the 6150 tower models of the RT.  This connector is refered
    to in the IBM hardware manuals as a MODU connector. 

    The 10-pin connector used on the native serial ports, is also used by
    the fan-out box for the RT RS232 8-port card.  These part numbers 
    for the connector were given to me by the IBM support center in
    Austin, TX for the RiscSystem/6000.  The 6000 has the same 10 pin
    MODU connectors for the 6000 systems native serial ports, and is the 
    same connnector used by the RT systems native serial ports.

                AMP Product Corp.

                  Housing       AMP P/N         102394-3
                  Cover         AMP P/N         102541-3
                  Back Cover    AMP P/N         102536-3
                  Ferrule       AMP P/N         102903-3
                  Receptacle    AMP P/N         2-87195-0
                  Receptacle    AMP P/N         86491-4
                  Shield Kit    AMP P/N         103125-2

   You can also get a 10-pin MODU connector pre-wired to a DB 25 pin 
   male connector, used for the Risc/System 6000 and is a short stub
   about 4 inches long.  It is IBM P/N  00G0943.  This stubby cable
   will work just fine for connecting modems, and with a properly wired
   extension able, for printers and terminals as well.

   ======================================================================
    Looking INTO the connector pins in the back of the RT tower,
    here is the pin-out assignments and functions.  The connector on the
    back of the RT tower model is a male MODU connector.  This pinout
    is the same for the IBM 4-port card, and the fan out box of the IBM
    8-port card.

                               @   pin  abb   function
    +-----------------+        T    1   TX  = Transmited data from RT
    |                 |        T    2   DTR = Data Terminal Ready   
    |  1  2  3  4  5  |        T    3   RTS = Ready to send
     |               |         R    4   RI  = Ring Indicate
     | 6  7  8  9 10 |         -    5   -     No connection
     |               |         R    6   RX  = Received data to RT
     +---------------+         R    7   DSR = Data Set Ready
                               R    8   CTS = Clear to send
                               R    9   CD  = Carrier Detect
                               -   10   GND = Signal Ground

       @ means   T = RT transmits  R = RT receives (listens)

   ======================================================================
   RS232 Modem attach cable. Feature #4704, Part# 6298240  Option #6294704
         IBM supplied cable is 3 meters long, with a 25 pin male connector.

   This has worked for my modem attach.. I have not actually used a meter
   on a STOCK IBM RT modem cable, but this works for me.

   NOTE: Metering the IBM RS6000 stubby cable P/N 00G0943 matches this pinout.

     Pin#   1   2  3   4  5  6  7  8  9  10      10-PIN MODU  female
            |   |  |   |  |  |  |  |  |  |
            |   |  |   |     |  |  |  |  +--+
            |   |  |   |     |  |  |  |  |  |
            2  20  4  22     3  6  5  8  7  1    DB25 male connector

       NOTE: pin 5 of the MODU connector is unused.

   ======================================================================
   The following cable wirings were discovered by using a meter probe on 
   IBM RT RS232 cables and by opening the hoods on the DB25 connector ends.
   IBM part numbers and option numbers listed where known.
   They are still orderable from IBM the last time I checked.

   ======================================================================
   RS232 Terminal attach cable. Feature #3913  Part# 6298526  Option# 6298186

     Pin#  10     6   1     9   2  8   3   7   10-PIN MODU female
            |     |   |     |   |  |   |   | 
            |     |   |     |   |  +---+   |
            +--+  |   |  +--+   |  |       |
            |  |  |   |  |  |   |  |       | 
     Pin#   1  7  2   3  4  5   6  8       20   DB25 Female connector

   ======================================================================
   RS232 Serial Printer attach cable.
         Feature #4803  Part# 6298525 Option# 6294803

     Pin#  10      6   1   7  9  3  2      8     10-PIN MODU female
            |      |   |   |  |  |  |      | 
            |      |   |   |  +--+  |      |
            +--+   |   |   |  |     +--+   |
            |  |   |   |   |  |     |  |   | 
     Pin#   1  7   2   3   4  5     6  8   20    DB25 female connector

-------------------------
H.11 - What is the pinout of the 6150/6151 Mouse/Tablet port?
  
   [ Has anybody gotten a NON-IBM RT mouse running on an RT? - MW ]

     Here is pin-out and information on the RT locator port.
     More information is available from "IBM RT PC Hardware Technical
     Reference" Volume 1 P/N 75X2032,  Chapter 9  pages 9-24 thru 9-29,
     and from Chapter 5, pages 5-131 thru 5-135 and page 5-145. 

    [ The connector is a AMP type, I don't have the P/N of how to get the
     parts to construct one - MW ]

        Connector Specifications: 
        (view is looking into the connector (male receptacle) socket on the
         back of the RT system unit.

         +--------------+            1 = ground.
         |    1  3  5   |            2 = Transmit to device.
         |              |            3 = +12 Volts
          -   2  4  6  -             4 = -12 Volts
           |          |              5 =  +5 Volts
           +----------+              6 = Receive from device.

    The RT standard locator device is a two button mouse. 
    The middle button on a three button mouse can be simulated by 
    pressing both buttons simultaniously, mostly used for X-windows.

      Resolution: 25, 50, 100 or 200 counts per inch.  Default=100.
      Sampling rate: Programmable 10,20,40,60,80 or 100.  Default=100.
      Data modes:  Stream (default), remote.
      Scaling: Linear (default), exponential.
      Protocol: RS232C, 9600 baud, async, full duplex,
         1 stop bit, odd parity.

      - Self test at power-on or when requested by system.
      - The locator device is semi-intelligent and has 14 different
        commands that it understands.
      - 11 bit framing protocol.

    IBM part numbers for the RT mouse are:

      00F2384   Mouse.  Also called a 6100 pointing device.

    A IBM 5083 tablet may also be used as a locator device.

    IBM part numbers for the 5083 tablet are:

      6248516   IBM 5083 Model 11A tablet.
      6248515   IBM 5083 Model 12A tablet.
      6248522   Stylus for 11A or 12A tablet.
      6248523   4-Button Cursor for 11A or 12A tablet.
      6248524   Cable RT PC to 5083 for 11A or 12A tablet.

-------------------------
H.12 - What is the pinout of the 6150/6151 Keyboard port?

     Here is pin-out and information on an RT keyboard.
     More information is available from "IBM RT PC Hardware Technical
     Reference" Volume 1 P/N 75X2032,  Chapter 9  pages 9-3 thru 9-23,
     and from Chapter 5, pages 5-85 thru 5-114. 

    [ The connector is a AMP type, I don't yet have the P/N of how to get
      the parts to construct one. Anybody?  - MW ]

     Connector Specifications: 
        (view is looking INTO the female connector socket on the cable attached

         to the keyboard)

         +--------------+            1 = +5 Volts
         |    5  3  1   |            2 = Keyboard Data
         |              |            3 = Speaker Signal
          -   6  4  2  -             4 = Speaker Return (+5V)
           |          |              5 = Ground
           +----------+              6 = Clock  (diagrams in the book seem
                                         to indicate that clock is generated
                                         BY the keyboard)

    Microcomputer in keyboard performs following functions:
      - Self test at power-on or when requested by system.
      - keyboard scanning.
      - Buffering of up to four key scan codes.
      - Executing the hand-shake protocol requred by each scan code transfer.
        - full-duplex serial interface
      - communicates with a 8255A PIO chip and a 8501 microprocessor
        in the RT planar.
      - 11 bit framing protocol.

    IBM part numbers for the RT keyboard are:

      1392366   Keyboard, United States English.
      1392374   Keyboard, United Kingdom English.
      1392373   Keyboard, Canadian-French.

    Ten other part numbers are listed for other language layout keyboards.

-------------------------
H.13 - Can I use an AT keyboard on an RT?

       NO.  While most of the signals are the same, there are four 
       major differences:
           1) There is a speaker in the keyboard.
           2) The physical connector is not the same.
           3) Some of the scan codes are different.
           4) Some of the programing commands are not implemented in 
              the AT keyboard.

     Difference 1 and 2 are managable, but 3 and 4 imply some way
     is needed to alter the keyboard ROM chips, or basic hardware.

    [ ANY input on how to hack a keyboard for RT compatibility is
      gladly welcomed!  - MW ]

-------------------------
H.14  How do I get a parallel printer attached to an RT?

      [ This information has been taken from the AIX manuals, if there
        is a difference for AOS, let me know. - MW ]
        
      There are three different ways to attach a centronics parallel
      printer to the RT.
      A maximum of two parallel printer interfaces are supported, but
      only by using a AT serial/Parallel card, jumpered at the
      secondary printer port address.

        1) AT Serial/Parallel interface card.
           Parallel port primary address = 3BC
           Parallel port secondary address = 278

        2) PC/XT Monochrome/Parallel printer card.
           Parallel port only address = 3BC 
           No jumper available to disable this port.

        3) Megapel card has a parallel interface on it. 
           Parallel port only address = 3BC
           Swich 1 position 2 enables/disables the port.
           Shipped disabled from factory.

        Recent discussions in this newsgroup indicate that clone printer
        port cards will work with AIX.  Personally, I have used both
        the AT Serial/Parallel card and the XT monochrome adapter just
        fine to run parallel printers.

-------------------------
H.15  What are the switches on the Megapel adpater for?
      Technicial information on Megapel adapter and display.
        
      Switch 1 is located on the display processor card (the one with the
      25-pin parallel printer connector on it).

          1   Not used. Must be set to OFF.
          2   On = Enable printer port.   Off = Disable printer port.
          3   Enable CGA emulation mode.  Off = Normal Megapel mode.
          4   Not used. Must be set to ON.

      [ Anybody know what the 'not used' switches do? - MW ]

     Megapel and display technicial information:
        Slot position           Must be installed in slots 4 and 5 ONLY.
        I/O Addresses           0930-094F
        Memory ddresses:        0B8000-0BBFFF   CGA emulation mode.
                                C00000-C3FFFF   Adapter data space.
                                D60000-D7FFFF   Adapter program space.
        DMA channel             7
        Interrupt level         11  (shared)
        Horizontal Frequency    63.36 Khz
        Vertical Frequency      60 Hz,  Non-Interlaced.
        Display connector       3-pin Video (D-shell)

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:&u9&X& & ˎ9&X&&k%PFPVǋFvW	3^_]UWVF ǆP  Ɔ{ ǆ8o%:ǆ<w%>ǆ@~%BǆD%FǆH%J+NL9&
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%P|	T:& P 	FVpP 	FV+FF{{<vv~ uZ6`#6^#%P~V P~V"P~VJ]	--H.21 - What SCSI devices can be attached?     The amount and type of support for SCSI devices varies by the     operating system used. Please refer to the different RT operating     system specific FAQ list for more information about SCSI support.         The IBM suported SCSI adapter is a 'Differential Driver/Receiver      option' with the 'Alternative 2 connector'.  The SCSI interface      conforms to (then) proposed ANSI standard X3T9.2/82-2 Rev. 17B.     Two wires are used for each signal lead in a push-pull signaling     method also called 'differential-ended'.  Most drives for other vendor     workstations and PCs use a 'single-ended' SCSI implementation.     What this boils down to is that the IBM SCSI card is electriclly      incompatible with a lot of the off-the-shelf SCSI drives.     IBM officially supported only one device attached to the SCSI     interface card, the 9332 'Athens' disk drive.     However, all is not lost. :-)     Some vendors do offer their SCSI drives with an optional differential     interface.  There also exist a couple of manufacturers of     'Differential-to-single-ended' converter boxes.  These boxes allow     a bi-directional conversion of the SCSI bus and will allow attachment     of these single ended disk drives.     See the AIX FAQ for more information about using OEM SCSI disks      on an RT using the IBM SCSI board.      Under the AOS operating system, several people have modified the     system to use an Adaptec SCSI controller.  That controller uses     single-ended devices.        [ More information about this Adaptec controller can be found in          the AOS specific FAQ list. - MW ]-------------------------H.22 - What do the LED codes mean during power on?     When power is first applied, initial self tests are performed by      built it ROM routines and special processor on the system planar     board.  These self tests should complete with in 1-2 minutes.        ROS LED Values during IPL        00      Initialization of Mono/Printer adapter failed        01      ROS CRC did not compare - Fatal        02      Soft IPL check failed - Fatal        03      Memory error or no memory - Fatal        04      Processor card logic error - Fatal        05      Processor or memory error condition - Fatal        07      IOCC test resident POST - Fatal        08      Bad processor card in IOCC test - Fatal        09      Keyboard adapter resident POST - Fatal        0c      initialization failed - Mono/Printer adapter and APC        10      System timer resident POST - Fatal        11      Interrupt controller POST - Fatal        12      DMA arbiter resident POST - Fatal        13      Serial port resident POST        14      Fixed disk resident POST adapter 1 test        15      Fixed disk resident POST adapter 2 test        16      Diskette resident POST adapter 1 test        17      Diskette resident POST adapter 2 test        18      Extension ROS        19      Attemting Manufacturing IPL        1c      Advanced Processor card - Fatal        1u      Enhanced Advanced Processor and memory Mgmt card - Fatal        20      NVRAM CRC check        21      No boot record found (NVRAM selected devices)        22      No boot record found (ROS selected devices)        23      Disk or diskette adapter slot or address - Fatal        25      User error - invalid RamSpecReg - Fatal        26      Attempting soft IPL        27      Bootable code exceeds available storage - Fatal        28      Unexpected return from loaded code - Fatal        29      IPL process passed control to loaded code.        3c      Advanced Processor card and first 128K of memory.        3u      Enhanced Advanced Processor and memory Mgmt card.        4c      APC logic (Advanced Processor Card).        4u      Enhanced Advanced Processor and memory Mgmt card Logic.        5c      APC logic and system memory.        5u      Memory expansion option or Enhanced Advanecd Processor and                 memory managment card.        88      reserved - POR or processor check        89      Unexpected machine or program check - Fatal.        8c      IOCC test for APC.        8u      Enhanced Advacned processor and memory managment card.        96      Memory card 1 resident POST error condition.        97      Memory card 2 resident POST error condition.        98      Memory card 1 and 2 resident POST error condition.        99      KEY locked, locked response.-------------------------H.23 - What does LED code xx mean (during runtime)?     LED codes displayed while running vary greatly depending on the     operating system used. Please refer to the different RT operating     system specific FAQ list for more information about these LED     codes used.-------------------------H.24 - What is different about the RT I/O slots.       What cards will run in slot 8.    The IBM RT 6150 and 6151 system units use ISA (AT) style I/O slots,   however slot 5 on the 6151 and slot 8 on the 6150 are unique to the RT.     Most cards that do not use memory refresh, or DMA channel 7 will   have no problem with that slot.  Bus timings may be slightly different,   from an AT, as I/O accesses are not driven by the processor directly,   but are routed via a special bus processor called the IOCC.    The 8th slot in the 6150 RT and the 5th slot for the 6150 only   have three signals different from the normal PC/AT assignments.     Pin    Standard     CO-proc slot usage    My notes..      B19    REFRESH      + SPK DRV             (Wire or'd to speaker control)     D14    DACK 7       - DACK 8              DMA channel is reassigned..     D15    DRQ 7        + DRQ 8                 .. ditto   The following cards cannot go in slot 8:     - AT 512Kb Memory expansion card (no refresh signal available).     - Baseband adapter (Ethernet, Ungerman-Bass) [Timing?? -MW]     - SCSI adapter ONLY when it is using DMA channel 7... channel 7 is       not connected to SLOT 8.   These cards require special slot placements:     - EGA adapter only in slot 3 or 6 (6150) or slot 1 (6151).     - Megapel adapter is two boards sandwiched together, and can       only be installed in slots 4 & 5 in a 6150 tower.       It can also be installed in slots 2 & 3 (prefered), slots 3 & 4,       or slots 4 & 5 (least prefered) in the 6151.       [ It has been noted via discussions in this newsgroup that the        the later X servers will have problems, errors and timing problems        if the megapel adapter is NOT placed in the prefered slots! -MW ]     - AT-Coprocessor in installable ONLY in slot 8 of the 6150 tower,       or in slot 5 of the 6151 desktop.       (That's why it is called the coprocessor slot!  :-)     - The PC XT mono/printer adapter, is ONLY supported in slot 3 in         the 6150 tower, or ONLY in slot 1 in the 6151 desktop.         [ I'm not sure why this slot 3 restriction is here, what's          wrong with slot 6?  Timing? - MW ]        IBM Mono Adapters with Part numbers 1804065, 1804073 or 1501667         cannot be used according to the parts book that I have seen.        The options book indicates that those part number mono adapters        will not operate correctly with an RT.                I have had reports that clone monochrome cards also may have        problems running in an RT.  I have not tried them myself.   Any 8-bit card is better off in slots 3 or 6 (6150) or     in slot 1 (6151), as those slots are 8-bit only anyway.     Save a 16-bit slot for a card that needs it.-------------------------H.25 - How do I run diagnostics.       IBM supplied with most RT systems several books, one set of three books       are maroon in color, and contain setup, install and one book labeled       "IBM RT PC Problem Determination Guide" (RT PD).  The Problem       Determination guide is usually composed of two manuals in one       binder.  IBM manual number SA23-2604, and for those users who       ordered AIX with their systems, it also contains SA23-2603 titled:       "IBM RT AIX Operating System Problem Determination Guide".       This binder also contains three diskettes with maroon labels.        Volume one of the three diskettes is bootable, and when booted,       causes it to examine the system hardware, and place a menu of       diagnostic options on the screen.  Most of the diagnostics are menu        driven and are self-explanatory.  The RT PD guide will take you thru       any special procedures if necessary.        Further problem diagnosis is available in the dark blue book        with the title "IBM RT PC 6150 System Unit Hardware Maintenance       and Service"  Manual# SA23-2605 or Part Number  22F9803.        This book contains problem isolation charts, part numbers,       installation information and a SRN (Service Request Number) to       FRU (Field Replaceable Unit) part index.  This book also contains       a LED fault code to SRN reference, as well as probable failure part       analysis charts.       -------------------------H.26 - Serial port cards maximums and limitations.   NOTE: The following information is gleaned from the IBM announcement         letters and general information sheets.  It is the only information          I have acess to and concentrates on the limitations imposed by         AIX 2.2.1 on the RT hardware, the only announced OS IBM supported         for the RT systems.         AOS users report that the baud rate limits have been exceeded         up to 56Kb by modifications to the standard AOS kernel.          I am not sure at this time what the exact speed capabilities and         limitations may exist with the modified AOS kernel.  - MW        *   The internal serial ports of the 6150 tower model RT are            normally able to run at a maximum of 19.2K bits per second.        *   The IBM RT 8-Port Adapter is capable of all 8 ports operating            concurrently at 19.2 K bits per second.         *   All 8-Port Adapters installed in a single system unit should            be set to the SAME interrupt level for best performance.        *   For proper software operation, 4-Port Asynchronous Adapters            must be set to a DIFFERENT interrupt level than 8-Port            Adapters, when installed in the same system unit.        *   IBM RT 8-port Adapters in the 6192 Expansion Unit should be            set to DIFFERENT interrupt levels.  Interrupt sharing is not            supported between the IBM RT System Unit and the 6192            Expansion Unit.        *   A maximum of EIGHT 8-port Adapters can be installed on a system.             (e.g. 6 adapters in the 6192 Expansion Unit and 2 in the RT             system unit)        *   Concurrent use of 4-Port Adapters and/or PC AT Serial/Parallel            Adapters and/or 6150 native Serial Ports with the 8-Port            Adapters may result in reduced performance on the devices            attached to the 8-Port adapters, depending upon line speeds             and device usage.        *   If a 5080 Peripheral Adapter is installed in the system            unit, the maximum numbe-------------------H.20 - What are the characteristics of the various IBM RT disk drives?       This table is collected from the various hardware manuals       for the IBM RT, and from other sources.        Note: All drives have a 512 byte sector size.        Drive   part#           type    Cyl     head    Sects intrl (2)        R40     6299235         MFM     733     7       17      2   (1)  R70     61X6942         ESDI    566     7       36      4        E70     73X3989         ESDI    582     7       36      1        E114    00F2273         ESDI    914     7       36      1        E310    08F3358         ESDI    1225    15      34      1   (3)  H310    08F3358         ESDI    1225    15      34      1  Note 1: I am not sure why the tech manuals give such radically          different number of available cylinders for the identical          disk drive.  I have seen an R70 and E70 side by side, and          they are identical, and are 'IBM type 0667' drives!          [ Are there some other 'R70' drives out there?? -MW ]  Note 2: intrl = Sector interleave value,  sects = Sectors per track.  Note 3: The MAXTOR documentation indicates that the drive normally               has 36 sectors per track, yet all the IBM drive tables and              documentation indicate differently.              See also the VRM table below.             An intresting recent addition is this table I built by examining the        VRM utility format program. When you need to reformat a new or         non-IBM drive, this utility will place the minidisk partition table        and other IBM required identification information on the drive.         While you can enter non-standard paramenters, built into the        program are the parameters for all the IBM drives.        Anybody know the reason for the discrepency?  Which is correct?        The R30 is intresting, I have never seen it described in any        IBM liturature for the RT.                Drive   type    cyls    heads   sects   intrl   skew    precomp        R30     MFM?     733     5      17      2       0       300        R44     MFM      733     7      17      2       0       300        R70     ESDI     566     7      36      4       0       none        E70     ESDI     683     7      35      1       0       none        E114    ESDI     915     7      35      1       7       none        E310    ESDI    1225    15      33      1       8       none   (3)  H310    ESDI    1189    15      34      1       0       none-----------------------   |_____|  |____________|     |       Position A is for floppy drive cable.     B  = for dasiy chained data cable for both hard drives.     C  = for first drive control cable, or third drive on second card.     D  = for second drive control cable.     Jupmers in "S" direction for secondary, "P" for Primary.     I/O addresses used (jumpered primary, slot 1):        Floppy drives A and B - 03F0 - 03F7        Drives C and D        - 01F0 - 01F7     I/O addresses used (jumpered secondary, slot 2):        Drives E              - 0170 - 0177     DMA channel 2 (diskette only)     IRQ diskette - 6  Fixed disk - 14.-------------------------H.29 - Jumper locations and information on ESDI adapter.    The ESDI controller has the same connector arrangement as the MFM    controller and only a SINGLE jumper in about the same position as the    MFM controller.  Looking at the card, the jumpers would be with the "S"    direction being for Primary (backwards from the jumpering for the MFM    controller) and the "P" direction for secondary.    This interface board was discontinued with the announcement of the    EESDI controller card.     This controller has a part number of  00F2160.     I/O addresses used (jumpered primary, slot 1):        Floppy drives A and B - 03F0 - 03F7        Drives C and D        - 01F0 - 01F7     I/O addresses used (jumpered secondary, slot 2):        Drives E              - 0170 - 0177     DMA channel 2 (diskette drives only)     IRQ diskette = 6  Fixed disk = 14.-------------------------H.30 - Jumper locations and information on EESDI adapter.   The Extended ESDI controller had two versions:  (see below)      ----------------------------------------------------- ---      |                 ::  ::  ::  ::  ::                 ||      |                 ::  ::  ::  ::  ::                 ||      |                 E   D   C   ::  ::                 ||      |                             B   A  X Y Z           ||    early card      |                                    . o-o           ||      --------------------------+     +--+            +----+                                 |_____|  |____________|     |      ----------------------------------------------------- ---      |                 ::  ::  ::  ::  ::                 ||      |                 ::  ::  ::  ::  ::                 ||      |                 E   D   C   ::  ::                 ||      |    Z Y X                    B   A                  ||    later card      |    o-o .                                           ||      --------------------------+     +--+            +----+                                 |_____|  |____________|     |         Position A - is for floppy drive cable both floppies.         Position B - dasiy chained data cable for all three hard drives.         Position C - for first drive control cable.         Position D - for second drive control cable.         Position E - for third drive control cable.           Primary address,  jumper  Z to Y.         Secondary Address, jumper Y to X.     Later version Part Number, 08F3766.     I/O addresses used:        Floppy drives A and B - 03F0 - 03F7        Drives C, D and E     - 01F0 - 01F7  and  05F0 - 05F7     DMA channels  Diskette = 2  FIxed disk = 0 or 1 (set by program).     IRQ diskette = 6  Fixed disk = 12 or 14 (set by program).-------------------------H.31 - Jumper locations and information on the 'PORTED' EESDI adapter.    The "Ported" or Portable Drive adapter was a special version of the    standard Extended ESDI controller that had the same identical layout,     jumper and pin configuration as the "later" version of the Extended    ESDI controler.  The one difference was an external connector on the end    plate of the card that could hook up the IBM "Portable drive bay"    enclosure.  The portable controller had the same connectors in the middle,    and I suspect that the "portable" controller was not any different from    the stock controller.        In a non-standard configuration, I have run run 6 ESDI drives by having    a standard Extended ESDI controller in slot one and a PORTED controller    in slot 2. The portable controller even had to be jumpered to the     "secondary" position for installation.  I also have tested the card    in the primary position (undocumented on the jumper setting in the manual,    but it looked JUST like the standard EE-ESDI card!) running the internal    E310 drives, and it worked just fine.       Part Number, 08F3612.     I/O addresses used: [looks like secondary addresses to me! - MW]        Drives F, G and H     - 0170 - 0177  and  0570 - 0577     DMA channels  FIxed disk = 1 or 3 (set by program).     IRQ Fixed disk = 12 or 14 (set by program).-------------------------H.32 - IBM 9332 Disk drive information.     IBM 9332 DIRECT ACCESS STORAGE DEVICE      No Longer Available, for ordering by IBM US as of May 17, 1993.     The IBM 9332 "Athens" fixed disk drive has models with both IPI-3      and SCSI interfaces.  The only version attached to the RT was via     the differential SCSI interface.  During boot time the AIX operating     system has the ability to download microcode to the drive.     The Models 240 and 440 drives are intended to be Rack-mounted      in a 9309 Rack Enclosure.  The Models 250 and 450 are mounted     in a standalone enclosure providing cooling and power.         The pinout of the SCSI connectors on the back of the 9332     conforms to (then) proposed ANSI standard X3T9.2/82-2 Rev. 17B,     In accordance with that standard, the 9332 uses the 'Alternative 2'     style shielded connector, wired for differential SCSI devices.     NOTE: These are the only model 9332 drives issued with SCSI interfaces.           Other model 9332 drives use an IPI-3 interface.         Model.................  240,250  440,450               Capacity in Mb          200.3      400.6               Format          Number of Cylinders     1349       1349            User                   1346       1346           Reserved                  3          3               Access in Milliseconds          Average                 19.5       19.5          Track-to-Track           3.2        3.2               Data Rate--Mb/sec           Maximum burst           4.0        4.0             multisector         1.4-1.9    1.4-1.9                Rotation Speed RPM       3119       3119               Latency in          Milliseconds             9.6        9.6               Number of Actuators         1          2-------------------------H.33 - Pin connections and tech. info on 6153, 6154 and 6155 monitors.  IBM 6153 Advanced monochrome Graphics adapter. - P/N 00F2357           Screen:         - Etched surface for reduced glare.        - 720 dots horizontal by 512 scan lines vertical.        - 12 inch diagonal white phosphor monochrome CRT.      Video Signal:        - Two-level video.        - Maximum bandwidth of approx 25.7 Mhz.        - Compatible with standard TTL driver.      Horizontal Drive:        - Free running Oscillator        - Normally low, positive TTL pulse        - Nominal horizontal frequency of 24.68 Khz        - Retrace blanking time of 8.0 usec.      Vertical Drive:        - Free running Oscillator        - Normally low, positive TTL pulse        - Nominal vertical frequency of 92 Khz        - Nominal frame rate 46 Hz.          Pinout:          Looking into female connector on the display cable.           (NOT into the adapter socket).          +---------------------------+          |  15 13 11  9  7  5  3  1  |           | 16 14 12 10  8  6  4  2 |           +-------------------------+             1 = Signal ground for vertical sync        2 = Vertical Sync        3 = Signal ground        4 = Reserved         5 = Signal ground        6 = Reserved        7 = Signal ground for video.        8 = Video        9 = Signal ground       10 = Reserved        11 = Signal ground       12 = Reserved         13 = Signal ground       14 = Reserved        15 = Signal ground for horizontal sync       16 = Horizontal Sync  IBM 6154 Advanced Color Graphics adapter.   - P/N 00F2350      Screen:         - Etched surface for reduced glare.        - 720 dots horizontal by 512 scan lines vertical.        - 14 inch diagonal shadow mask color CRT.      Video Signal:        - Two-level video for 6 video lines.        - Maximum bandwidth of approx 25.7 Mhz.        - Compatible with standard TTL driver.      Horizontal Drive:        - Free running Oscillator        - Normally low, positive TTL pulse.        - Nominal horizontal frequency of 24.68 Khz        - Retrace blanking time of 8.0 usec.      Vertical Drive:        - Normally low, positive TTL pulse        - Nominal vertical frequency of 92 Khz        - Nominal frame rate 46 Hz.        - Retrace blanking time of 527.0 usec.          Pinout:          Looking into female connector on the display cable.           (NOT into the adapter socket).          +---------------------------+          |  15 13 11  9  7  5  3  1  |           | 16 14 12 10  8  6  4  2 |           +-------------------------+             1 = Signal ground for vertical sync        2 = Vertical Sync        3 = R1 signal ground        4 = low order red bit (R1)        5 = R2 signal ground        6 = high order red bit (R2)        7 = G1 signal ground        8 = low order green bit (G1)        9 = G2 signal ground       10 = high order green bit (G2)       11 = B1 signal ground       12 = low order blue bit (B1)       13 = B2 signal ground       14 = high order blue bit (B2)       15 = Signal ground for horizontal sync       16 = Horizontal Sync       IBM 6155 Extended Monochrome Graphics Display      Low voltage   90 - 137 VAC  - P/N 6848215      Hi  voltage  180 - 259 VAC  - P/N 6848216      Power Frequency  48 - 62 Hz      Screen:         - 1024 dots horizontal by 768 scan lines vertical.        - 14 inch diagonal shadow mask color CRT.      Video Signal:        - 60 Hz non-interlaced.      Horizontal Drive: ??      Vertical Drive: ??     Pinout:          Looking into female connector on the display cable.           (NOT into the adapter socket).          +---------------------------+          |  15 13 11  9  7  5  3  1  |           | 16 14 12 10  8  6  4  2 |           +-------------------------+             1 = Signal ground for vertical sync        2 = Vertical Sync        3 = Reserved        4 = Reserved         5 = Reserved        6 = Reserved        7 = Video 1 Signal ground.        8 = Video 1        9 = Video 2 Signal ground       10 = Video 2        11 = Video 3 Signal ground       12 = Video 3        13 = Video 4 Signal ground       14 = Video 4         15 = Signal ground for horizontal sync       16 = Horizontal Sync-------------------------H.34 - 5081 Display technical information.        Horizontal Frequency  63.36 Khz        Vertical   Frequence  60    Hz  non-interlaced        Sync is on Green         Seperate Red, Green and Blue input and output connections.        Input  is labeled with circles with arrows pointing INTO the circles.        Output is labeled with circles with arrows poinging OUT OF the circles.        Output is intended to be used with daisy changed slave displays.        Switch on back of display labeled "0 2 4" is called the "Gain" switch.        It changes the termination value used for the video signals in the        display.  Position 0 is used when hooking up a single display.        RPQ 8K1679 modifies this display to 1280x1024 capability for                   the model 016.        RPQ 8K1680 modifies this display to 1280x1024 capability for                   the model 019.        NOTE: The 1280x1024 resolution is not available from the              standard megapel display adapter.              A Matrox PG1281/R display adapter and corresponding              device drivers supported this adapter/display combination.        NOTE2: The megapel adapter will NOT work with the 5081 model 2              monitor.-------------------------H.35 - Jumpers and documentation on the Ungermann-Bass IBM ethernet board.  The IBM ethernet board was made by Ungermann-Bass, and is the exact same  board as Ungarmann-Bass model 2273A NIC Baseband adapter.  Ungarmann-Bass may be reached direct at 1-800-873-6381.  With the gold fingers towards your stomach, and the bracket on the right  with the electronics up, the IRQ jumpers are just above the gold contacts.  The Address jumpers W10 thru W13 are to the left of the prom about the  middle of the board.  The unlabeled jumpers (W14 on some boards) on the  almost far left are the timer interrupt interval.  The jumper connects  only one pair of pins.          1    2    3    4  W14    . .  . .  . .  . .    position 1 = interrupt ever  9.1 ms                               position 2 = interrupt ever 18.3 ms                               position 3 = interrupt ever 36.6 ms                               position 4 = interrupt ever 73.2 ms  IRQ jumpers are labeled:   IR3 IR4 IR5 IR6 IR7 IR2 <--- IR2 is really IRQ 9, all others are correct.    .   .   .   .   .   X      connect only one vertical pair of pins.    .   .   .   .   .   X      IRQ9 is the factory default.  I/O Memory address jumpers  (Labled W10 thru W13)   W10   W11   W12   W13                  . .   . .   . .   . .    XXXX     =  jumper is connected two adjacent pins together.       X        =  Jumper is actually only jumpering ONE pin, the other side   X           of the jumper is hanging off of the row of pins and is               just there for future use.   W10   W11   W12   W13    ADDR        W10   W11   W12   W13    ADDR  ========================   ======  +   ======================   ======   X     X     X     X              |   X     X     X         X  .  X  .  X  .  X  .   080000  |   X  .  X  .  X  .  XXXX   0C0000 ========================   ======  +   ======================   ======         X     X     X              |         X     X         XXXX  X  .  X  .  X  .   088000  |   XXXX  X  .  X  .  XXXX   0C8000 ========================   ======  +   ======================   ======   X           X     X              |   X           X         X  .  XXXX  X  .  X  .   090000  |   X  .  XXXX  X  .  XXXX   0D0000 ========================   ======  +   ======================   ======               X     X              |               X         XXXX  XXXX  X  .  X  .   098000  |   XXXX  XXXX  X  .  XXXX   0D8000 ========================   ======  +   ======================   ======   X     X           X              |   X     X               X  .  X  .  XXXX  X  .   0A0000  |   X  .  X  .  XXXX  XXXX   0E0000 ========================   ======  +   ======================   ======         X           X              |         X               XXXX  X  .  XXXX  X  .   0A8000  |   XXXX  X  .  XXXX  XXXX   0E8000 ========================   ======  +   ======================   ======   X                 X              |   X                     X  .  XXXX  XXXX  X  .   0B0000  |   X  .  XXXX  XXXX  XXXX   0F0000 ========================   ======  +   ======================   ======                     X              |                         XXXX  XXXX  XXXX  X  .   0B0000  |   XXXX  XXXX  XXXX  XXXX   0F8000 ========================   ======  +   ======================   ======-------------------------H.36 - RT Token Ring card jumpers and addressing.      The Token-Ring card has a 9-pin female connector, and usually a green    dot sticker on the metal plate, but not always.     The adapter card had two versions, early and late.    For both versions, with J1 and J2 to the left, indicates no proms are    installed in the sockets shown by the XXX's.            ----------------------------------------------------- ---      |       ...  ...  +----------+           ...         ||      |       J1   J2   |small card|           J5          ||=|  9-pinconnector      |                 +----------+                       ||=|      |  XXX                                               ||          |  XXX                                               ||    early card      |   XXX                 YYYZZZ J3                    ||      --------------------------+     +--+            +----+|                                |_____|  |____________|     |       ----------------------------------------------------- ---      |       ...  ...                      ...  ...       ||      |       J1   J2                       J5   J6        ||=|  9-pinconnector      |                                                    ||=|      |  XXX                                               ||          |  XXX                                               ||    late card      |   XXX                 YYYZZZ J8                    ||      --------------------------+     +--+            +----+|                                |_____|  |____________|     |   During installation, make sure that the interrupt/DMA level does not   conflict with any other card, and that the I/O and DMA address jumpers   match, in accordance with the devices settings.  Note how the address and   DMA settings travel together.         I/O range     DMA     J5     J6        01c0-01cf      5      up     up        0140-014f      6      up     down        11c0-11cf      7      down   up     (see note below)        11d0-11df      3      down   down   (can conflict with serial port 1)   The 11c0 address cannot go in slot 8 of the tower (6150) model 25 or   slot 5 of the desktop (6151) model 10.  DMA channel 7 conflicts with   use of the megapel adapter. DMA channel 3 conflicts with serial port 1   (S1) on the planar.  Only a problem if you have that port defined via   devices, otherwise you can use DMA channel 3.   The early version of the RT Token ring card can only go at ONE of two   possible addresses.  It is recognized by having a daughter card plugged   on it about in the middle of the card (sometimes).   It also has a J1 and J2 jumpers in upper left and a J3 jumper in the   middle of the card along by the gold fingers, and a J5 address jumper only.   I personally have never seen the 'early' version of the RT Token card.   See page 1-21 of the 'User Setup Guide and Options Installation manual'   for more complete matrix of interrupt/DMA conflicts.-------------------------H.37 - What are the differences between the 032, APC and EAPC processor types.    The standard 032 processor in the original models of the RT had the    following features:      * 170 Nanosecond processor cycle time.      * 16  32-bit general purpose registers      * 16  32-bit system control registers, including:            - countdown timer register            - exception control registers            - interrupt request buffer register            - instruction address register      * 118  2 and 4 byte instructions with storage, branch, control, and        integer math, including multiply and divide step instruction.      * Memory Managment Unit with translation look-aside buffers, and        address translation including:            - 40-bit virtual address.            - 256 Megabyte memory segments.            - Multiple independent virtual address spaces.            - address space size of 4 gigabytes.            - demand paging.            - page size of 2048 or 4096 bytes.            - Memory protection.            - Real memory addressability of up to 16 Megabytes.            - Hardware assist for load real address     The Advanced processor (APC) has these enhancements to the original     processor.       * 100 Nanosecond processor cycle time.      * Overlapped Load and Store operations.      * Several instructions are serialized to allow for better memory and I/O        operations.      * Additional exception control register information.      * Instruction prefetch, and 16 byte loop detection.      * MMU allows multiple outstanding load and store requests      * On board 20 Mhz MC68881 floating point processor.            - Trigonometrice and transcendental functions.            - Seven different data types and conversions.      * I/O interface enhancements.    The Enhanced Advanced processor (EAPC) has these changes from the    original and APC processor.      * 80 Nanosecond processor cycle time.      * 16 Megabytes main memory on the processor board.      * Faster operation of the MMU.      * MC68881 and one I/O chip removed.      * Intended to be used with an Advanced Floating Point Accellerator.      -------------------------H.38 - Speed and capability of the Floating Point options for              the RT computers.  FPA, MC68881, AFPA.    All models of the RT systems running AIX can run with no floating     point hardware assist and provide for simulation routines for floating    point operations.    The standard Floating Point Accellerator (FPA) contains instructions    for general floating point operations, but does not include direct    hardware support for trancendental functions (sin, cos, tan, ect..).    The model 115 and 125 computers, with the Advanced Processor card    include a Motorola MC68881 chip running at 20 Mhz.  This chip is    faster than the FPA, but not as fast as the Advanced Floating     Point Accellerator (AFPA).    In genral the FPA is slower than the MC68881, which in turn is    slower than the AFPA.   The FPA advantange is it can run in     parallel with the processor, providing some overlap of operations.-------------------------H.39 - Where can I obtain a replacement battery?   The battery located under the front cover of the tower model RT next to   the keylock, and inside the case on the desktop unit behind the keylock   mounting bracket. It maintains the real-time clock for the system when   the power is off.  It also maintains the non-volatile ram (NVRAM) contents.   The NVRAM contains several items, among which are:   the last error record, and the current list of boot devices.   ==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==   Submitter: Matt "C P." Rush <mrush@ecst.csuchico.edu>   Subject: RT batteries through Radio Shack   Date: 26 Oct 93 21:10:43 GMT    Just in case anyone out there needs to replace the battery in    their RT, they can be Special Ordered through your local Radio Shack.    Amazingly, the IBM-RT is actually listed in their battery cross-    reference, but in case YOUR Radio Shack is lame,    the part no. is:   CLB-5293/W    The painful thing is the PRICE:  $15.99.  I decided that it    wasn't that bad to do a 'date' command every time I booted up. :-)   ==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==**==  My notes here..    This is average price for a lithium computer battery.    The batteries on some RT systems that I have used, have lasted as long as    6 years before needing replacement, others are still going strong,    so it is a relatively small price comared to other replaceables.    Someone asked:    > Are these batteries any different from garden-variety AT batteries?    There IS NO one common AT battery.  Some are 3V some a 6V.  Some are plug    in, some snap in more traditional battery carriers.    The RT battery (IBM P/N 6299201) for the RT is 6.8 volts!    Last I heard, IBM wanted $25.00 US for a RT battery.  The Radio Shack    battery sounds like a good deal, if it is a proper replacement.     I have seen FIRES start in an RT that had an improper battery!    At least one user has reported using AA batteries in a traditional    carrier.    As always.. caveat emptor, user beware, your milage may vary, ect..    - MW.-------------------------H.40 - RT 6157 tape interface card pinout and drive information.>   I have a type 6157 RT tape drive here, and I'm trying to find out what> sort of interface it uses.  It's the 45 meg 1/4" cartridge drive, and> popping it open revealed a Cipher modem 540 (or 640?) tape mechanism.Depending on the model of the drive, it is either a model 6157 (plain,with no dash) 60 Mb capabile (QIC-24 format tapes) drive or a model6157-2, 150 Mb drive (QIC-120 or QIC-150 format tapes) on write/read.Both models can read QIC-24 only the model 1 (no dash) can write QIC-24. The interface is used with either the IBM RT interface card, or acompatible vendor QIC-02 interface.  This is a industry standard interface,so you may be able to find another interface card that will support it.IBM used this drive on several pieces of equipment besides RT systems:6152 (PS2/60), and AS/400 and mabey others.I have never examined the internal works on one, so I am not sure of thepinout of the internal connector used between the IBM 37-pin cableand the internal transport.  I have no information on the actualtransport itself.  TANDON or CIPHER made the drives for IBM, and lotsof other vendors.The orignal cable terminates in a 37 Pin Male D-Shell connector.  Signal name         Signal pin      Matching ground pin  Cable shield        19              1  Parity Bit (odd)    20              2  Bit 7               21              3  Bit 6               22              4  Bit 5               23              5  Bit 4               24              6  Bit 3               25              7  Bit 2               26              8  Bit 1               27              9  Bit 0               28              10  On-Line             29              11  Request             30              12  Reset               31              13  Transfer            32              14  Acknowledge         33              15  Ready               34              16  Exception           35              17  Direction           36              18  Reserved            37Signal Interface:      QIC-02 Industry standardTransfer Rate          86.7K bits per second (model-1)Tape Speed             90 Inches per secondInternal data buffer   2K bytesI have the IBM schematics on the RT interface card.My notes:  (take with a minor grain of salt, I have not gotten out a             scope or meter on this..)  * Signal documentation leads me to belive all signals are active low.     (-Online..ect..)  * All grounds in pins 1-18 are attached to internal ground on the     interface card.  * All DATA interface leads appear to be driven by 74LS640's pulled up    to +5v by a 220/330 Ohm DIP resistor pack.    Thus... TTL level interface.  * Status leads are driven/recived by a 74LS244 constantly enabled.        *  Input status leads:  (From drive to interface)         Exception, Direction, Ack, Ready     * Output status leads:  (From interface to drive)         Request, Reset, Transfer, Online         * The IBM interface card uses a 8042 mated to a 82S105 for interface    controller duties, plus lots of 74LS support chips, plus two    TMM 2016 ram chips.-------------------------9.0   Credits, Acknowledgements and other information.X.1 - Acknolowgements and copyright information.This file is provided AS IS with no warranties of any kind as to theusefullness/correctness of these procedures/questions.  The authorshall have no liability with respect to the infringement of copyrights,trade secrets or any patents by this file or any part thereof.  In noevent will the author be liable for any lost revenue or profits orother special, indirect and consequential damages.IBM, AIX, AT, XT, RT, RT PC and RT Personal Computer are trademarks of  International Business Machines Inc.UNIX is a registered trademark of American Telephone & Telegraph in the  United States of America and other countries.Any other trademarks not specifically mentioned are owned by their respective  companies.X.2 - AIX/RT software FTP site(s).         Anonymous ftp site for AIX-2.2.1 softwares: ftp-rt.matheth.polymtl.ca   Fsp site (port 21) for AIX-2.2.1 softwares: ftp-rt.matheth.polymtl.ca   Gopher site (port 70) for AIX-2.2.1 softwares: gopher.matheth.polymtl.ca   The FTP site information above is maintained by: =======================   Francois Normant                      | Internet: fn@mathappl.polymtl.ca   Ecole Polytechnique - Mathematiques   | Compu$erve: 75210,525   C.P. 6079 - succursale centre ville   | Tel. (514) 340-5968   Montreal - Quebec - Canada - H3C 3A7  | Fax. (514) 340-4463X.3 - Credits:      The following people have either submitted articles for       inclusion, made suggestions, or had parts of old articles       included within re-arranged information.      If you want your name dropped please let me know.Marc Brett              <ltso@london.waii.com>Jon BrinkmannJohn Carr               <jfc@athena.mit.edu>David L. Crow           <crow@austin.ibm.com>Bjorn Engsig            <bengsig@dk.oracle.com>eliot                   <eliot@engr.washington.edu>Mike Johnson            <mike@neutron.amd.com>John R. Moore           <jrm@lgc.com>Francois Normant        <fn@mathappl.polymtl.ca>Gerald Oskoboiny        <gerald@vnet.IBM.COM> Richard Rogers          <rrogers@chinet.chinet.com>Matt Rush               <mrush@ecst.csuchico.edu>Russell Schulz          <russell@alpha3.ersys.edmonton.ab.ca>David Snearline         <davids@engin.umich.edu>John Tracey             <jtracey@cse.nd.edu>Andrew Yeomans          <ayeomans@vnet.ibm.com>Pim Zandbergen          <pim@cti-software.nl>====================== end of FAQ ibm-rt-faq/hardware =========================AIX..... NOT just another UNIX.Mark Whetzel                          | My own RT system.. My own thoughts..DOMAIN: markw@antimatr.hou.tx.us      | IBM RT/135 running AIX 2.2.1 UUCP ..!menudo!lobster!antimatr!markw | comp.sys.ibm.pc.rt FAQ maintainer