  ͻ
                                                                           
          ISA Bus: Installing Multiple Above Boards in a Computer          
                                                                           
  ͼ

INSTALLING MULTIPLE ABOVE BOARDS IN ONE COMPUTER

  If you want to use the Above Board Plus or Plus I/O in a computer that
  already has an Above Board, read this document for advice on setting up
  the boards.

  This document is divided into three parts.  The first part lists the Above
  Boards that can work together in a given computer. The second part
  describes the options you have for setting up multiple Above Boards in
  your computer.  The third part is a Hardware Worksheet for multiple Above
  Boards. Answering the questions on the Hardware Worksheet ensures that all
  the important information about your Above Boards is easy to find when you
  need it.

  Note:  If you're installing more than one Above Board Plus, Plus 8, Plus
  I/O, 286, or PS/286 in the same computer, you must insert them in your
  computer one at a time and run SETBOARD (described in Above Board manual)
  after each insertion.

     WHICH ABOVE BOARDS WORK TOGETHER?
     
     FOR IBM PC AT AND COMPATIBLE COMPUTERS

  In an IBM PC AT or compatible computer, all of the following Above Boards
  can operate together:

           Above Board Plus
           Above Board Plus I/O
           Above Board Plus 8
           Above Board Plus 8 I/O
           Above Board 286
           Above Board PS/286
           Above Board AT
           Above Board PS/AT

  Note:  Only the Above Board Plus, Plus I/O, Plus 8, Plus 8 I/O, Above
  Board 286, and PS/286 will fit in the IBM XT 286 computer with its cover
  on.  The Above Board AT and Above Board PS/AT will run in the IBM XT 286
  computer, but you won't be able to get its original cover back on.

  You can combine any of these Above Boards as long as you follow the
  guidelines presented in the second section (Setting up Multiple Above
  Boards).

     FOR IBM PC, PC XT, AND COMPATIBLE COMPUTERS
  In IBM PC, PC XT, and compatible computers, all of the following Above
  Boards can operate together:

           Above Board Plus
           Above Board Plus I/O
           Above Board Plus 8
           Above Board Plus 8 I/O
           Above Board 286
           Above Board PS/286
           Above Board PS/PC
           Above Board PC

  You can combine any of these Above Boards as long as you follow the
  guidelines presented in the next section.

     SETTING UP MULTIPLE ABOVE BOARDS
     
     PROVIDING CONVENTIONAL MEMORY
  You can set up only one Above Board to provide conventional memory. How
  you set it up depends on the boards in your computer and on your memory
  needs.  The Above Board Plus, Plus I/O, Plus 8, Plus 8 I/O, 286, and
  PS/286 can supply conventional memory in one of the following ranges:

             256K to 640K
             256K to 512K
             512K to 640K

  Both the Above Board/AT and Above Board PS/AT can supply conventional
  memory from 512K to 640K (but not at the same time).

  The Above Board/PC can supply up to 384K of conventional memory.  This
  additional memory, which must be contiguous, can start on any 64K-boundary
  between 256K and 640K.

  The Above Board PS/PC can supply either 384K or 128K bytes of conventional
  memory, and can start at either 256K or 512K.

      PROVIDING EXPANDED MEMORY
  You can provide up to 32M bytes of expanded memory with Above Boards in
  your computer.  The number of boards you use is limited only by the 32M-
  byte memory limit and your computer's power supply.

  Note:  You can use expanded memory with DOS version 3.0 or higher. You
  can't use expanded memory with XENIX or OS/2.

  The following table shows how much memory each Above Board and Piggyback
  Option could supply if all banks on each board were full of 256K-bit
  chips.

  MAXIMUM MEMORY AMOUNTS ON ABOVE BOARDS AND PIGGYBACK OPTIONS
  Ŀ
          Board                     Maximum possible memory    
  ͵
     Above Board Plus                    2M bytes              
     Above Board Plus I/O                2M bytes              
     Above Board Plus 8                  8M bytes              
     Above Board Plus 8 I/O              8M bytes              
     Above Board 286                     2M bytes              
     Above Board PS/286                  2M bytes              
     Above Board AT                      2M bytes              
     Above Board PS/AT                 1.5M bytes              
     Above Board PC                      2M bytes              
     Above Board PS/PC                 1.5M bytes              
     2M-byte Piggyback Option*           2M bytes              
     6M-byte Piggyback Option**          6M bytes              
  

  *  2M-byte Piggyback Options can be connected to an Above Board Plus, Plus
  I/O, 286, PS/286, AT, or PS/AT.

  ** 6M-byte Piggyback Options can be connected to an Above Board Plus, Plus
  I/O, Plus 8, Plus 8 I/O, 286, or PS/286.

  PROVIDING EXTENDED MEMORY (IBM PC AT AND COMPATIBLE COMPUTERS ONLY)
  You can provide up to 15M bytes of extended memory with Above Boards in
  your computer.  Table 1 shows how much memory could be supplied by each
  Above Board and Piggyback Option.  Extended memory can be supplied by any
  combination of these boards.

  If you have an Above Board AT with a serial number beginning with "B,"
  your computer can only have up to 6.5M bytes of extended memory.

     USING PARALLEL PORTS
  Your computer can have up to three parallel ports (LPT1, LPT2, and LPT3),
  provided LPT1 is on the IBM Monochrome Display Adapter or some other
  manufacturer's equivalent.  Otherwise, DOS limits your computer to two
  parallel ports.

  The Above Board Plus I/O, Plus 8 I/O, PS/286, PS/AT and PS/PC can each
  supply one parallel port.

  If your computer already has all the parallel ports it can support,
  disable the parallel port on your Above Board(s).  Read your Above Board
  manual for more information about the parallel port.

     USING SERIAL PORTS
  Your computer can have up to two serial ports, COM1 and COM2.  The Above
  Board Plus I/O and the Above Board PS/286 can each supply up to two serial
  ports, and the Above Board Plus 8 I/O, PS/AT and PS/PC can each supply
  one.

  If your computer already has all the serial ports it can support, disable
  the serial port on your Above Board.  Read your Above Board manual for
  more information about the serial port.

     FILLING OUT THE HARDWARE WORKSHEET
     
  Before installing this Above Board, fill in the first three columns of the
  worksheet (on the last page of this chapter) for the Above Boards you've
  already installed.

  For Above Board Pluses, Plus I/Os, Plus 8s, Plus 8 I/Os, 286s, and PS/286s
  in your computer, record the following:

           Serial number (on the Above Board and listed in SETBOARD)
           Number of memory columns filled
           Type and speed of RAM chip you are using

  For Above Board PCs, PS/PCs, ATs, and PS/ATs in your computer, record the
  following:

           Switch settings  (The Above Board's manual explains what each
            switch does.)
           Number of memory columns filled
           Type and speed of RAM chip

  Run SETBOARD for each Above Board installed in your computer. Complete the
  information on the worksheet with the help of the summary screen at the
  end of SETBOARD.

                          HARDWARE WORKSHEET
  Ŀ
   Above Boards                 1       2       3       4   
  ͵
   Serial Number                                            
   or Switch Settings*                                      
  Ĵ
   Number of memory                                         
   columns filled                                           
  Ĵ
   Type (and speed)                                         
   of RAM chip                                              
  Ĵ
   Parallel Port name                                       
  Ĵ
   Serial Port name                                         
  Ĵ
   Extended memory address                                  
   (starting/ending)                                        
  Ĵ
   Base I/O address*                                        
  Ĵ
   Board Number (TESTAB Only)                               
  

  *  When you have two or more Above Boards and one is supplying only
  extended memory, don't include its I/O address on the EMM command. There
  is a possiblity of memory shift if one of the boards is an Above Board
  Plus.

         PIGGYBACK MEMORY BOARD
         Ŀ
          Piggyback Memory Board         1        2     
         ͵
          Number of Columns filled                      
         Ĵ
          Type (and speed)                              
          of RAM chip                                   
         

  *  Fill in the serial number for Above Board Plus, Plus I/O, Plus 8, Plus
  8 I/O, 286, and PS/286.  Fill in the switch settings for Above Board/PC,
  PS/PC, /AT, and PS/AT.



End of file                 Intel FaxBack # 1018          December 2,1992
