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                     Inboard 386 Common Problems                          
                                                                          
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 101 KEY ENHANCED KEYBOARD PROBLEMS

     IBM PC AT Model 339 (8 MHz) computers are the only IBM computers that
     can use a 101 keyboard.  The Shift or Ctrl keys may stick in an AT
     computer with an earlier BIOS.  A newer version of the BIOS will fix
     the problem.

 BEEPS AT POWER UP

     Ŀ
      These sounds:               Indicate a problem with this:   
     ͵
      CONTINUOUS BEEP             The power supply                
      REPEATING SHORT BEEPS       The power supply                
      1 LONG AND 1 SHORT BEEP     System Board                    
      1 LONG AND 2 SHORT BEEPS    Display                         
      1 LONG AND 3 SHORT BEEPS    Enhanced Graphics Adapter       
     

 BOOT FAILURE DURING INSTALLATION

     Some 8-MHz COMPAQ DESKPROS (with memory on the system board) and
     PORTABLE IIs (with assembly numbers 324.XX and 328.XX), won't boot when
     you install an OS/2 compatible Inboard 386.  If you have this problem,
     contact Intel customer support.

 COMPAQ DESKPRO 286 AND 164 AND 201 MESSAGES

     You must fill all system board sockets in the COMPAQ DESKPRO 286 before
     you can add additional memory to the computer.

 COMPUTER AUTOMATICALLY REBOOTS

     Adding an expansion board such as the Above Board can cause the COMPAQ
     286 to reboot itself automatically.  This is symptom of either a
     failing power supply or a bad connection between the power supply and
     the system board.

     First check the connection between the power supply and the system
     board.  Vigorously reseat the connection, but be careful to not press
     so hard that you break the connector or system board.  If the power
     supply is bad or too weak, you'll need to replace it.

 ILIM386 PRIVILEGED OPERATION EXCEPTION ERROR

     ILIM386 generates this error when an instruction is incompatible with
     the current CPU operation mode.  An interaction between the application
     software, ILIM386, and the system BIOS can cause this error.  Changing
     the system BIOS may solve the problem.

     This error can also be caused by the incorrect amount of Extended
     memory being set by the EXT= parameter on the ILIM386.SYS command line
     of the CONFIG.SYS. If the user wants to set aside some Extended memory,
     the EXT= parameter must specify the amount needed, plus 144K for
     ILIM386.SYS to load into. For example, if a user wanted to have 256K of
     Extended memory available for use by the ICACHE.COM disk caching
     utility, the ILIM386.SYS command line of the CONFIG.SYS would look
     like:
         DEVICE=ILIM386.SYS EXT=400
         (256K for the ICACHE, and 144K for ILIM386.SYS)

 ILIM386 VERSION 4.07 AND SOFTWARE WARMBOOTS

     When you use ILIM386 version 4.07, a software generated warmboot  will
     result in an error when INBRDPC.SYS tries to load.  The error will
     state that 80386 control software has been loaded.  This is because
     ILIM386 put the 386 CPU into "virtual 86" mode and this mode is not
     reset by the software warmboot.

 LOCKUPS WITH CAD PROGRAMS

     Some programs will recognize a math coprocessor even if the math
     coprocessor switch is set incorrectly.  Other programs won't, so make
     sure the switch is set correctly.

 MEMORY BOARD FAILURE

     Installing the Inboard 386 and the faster crystal in 6-MHz IBM ATs can
     cause memory boards to fail.  If the BIOS is dated Jan. 10, 1984 it's
     okay to leave the original 12-MHz crystal in the computer to avoid
     memory board failure.

 MONITOR BOOTS UP IN 40-COLUMN MODE

     This can happen with EGA boards.  The solution is to use the EGASIZE=
     parameter in the INBRDAT.SYS device driver command.

 OUT OF ENVIRONMENT SPACE

     The environment may be up to 32K bytes long.  During power on,
     COMMAND.COM receives a default environment size of 160 bytes.  This can
     fill up quickly, in which case DOS displays the message "Out of
     environment space."  If you use DOS 3.1 through 3.3, you can increase
     the environment size by including the following command in the
     CONFIG.SYS file:
         shell=[d:][path]command.com /p /e:xxxx

     In DOS 3.1, xxxx is the # of paragraphs (16 byte blocks) in the
     environment.  The allowable range is from 10 to 2048.  In DOS 3.2 and
     3.3, xxxx is the actual # of bytes in the environment.  The allowable
     range is from 160 to 32,768.

 SCO XENIX SERIAL PORT IDENTIFICATION PROBLEMS

     Xenix can have trouble identifying serial ports On any cached 386
     machine, including those equipped with Inboard 386.  This is a problem
     with Xenix, not the Inboard.  It occurs only on fast cached machines.
     Xenix requests a status report from the serial ports then tries to read
     the results before the routine returns them.

     To fix this problem, edit the SIOCNF.C file in the /USR/SYS directory.
     Locate the table declaration containing many different types of serial
     ports.  Put the declaration of the affected serial port at the top of
     the list and make at least 5 duplicate entries. This way Xenix will
     check the port several times and one of the requests will retrieve the
     results.  Recompile the "siocnf.c" file, then do a "make libio" to make
     the I/O libraries.  When you're done, link it into the kernel and
     reboot.  Field reports indicate that this procedure has completely
     fixed the problem.

 SCO XENIX 386 AND ESDI HARD DISK CONTROLLERS

     (Field report) A customer reports intermittent VERY slow hard disk
     access using 3 brands of ESDI controllers in system with Inboard 386.
     No known solution.  The same hardware works fine in different 386
     systems.

 301 KEYBOARD ERROR

     This error message may occur on boot up.  So far it has not been
     related to any real problems.  The solution is to hit (F1) to continue
     and ignore the message.  The message should be intermittent, and seems
     to be related to having the "old"-style AT keyboard on an new 8 MHz AT.



End of file                 Intel FaxBack # 2064          June 25,1992
