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KEYFIX02.DOC
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1992-06-03
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Sunni Holland, from Microsoft Corporation (sunni@microsoft.com)
provided the following information from the MS database:
-----------------------------------------------------------------------
March 23, 1992
You may encounter erratic keyboard behavior when using the MS-DOS 5.0
HIMEM.SYS driver on certain systems. Symptoms may include a variety of
problems interpreting the state of the SHIFT, CAPS LOCK, NUM LOCK,
ALT, and CTRL keys.
If you encounter this kind of problem, use the HIMEM /machine:xxxx
switch to specify an alternative delay for the A20 handler. Try
switches 11, 12, and 13 (in that order). These switches represent
progressively longer delays in the switch state of the A20 line.
Setting the /CPUCLOCK: switch to ON may also alleviate the problem.
This information applies to Microsoft MS-DOS version 5.0.
More Information:
Another workaround is to include the line
c:\dos\keyb us,,c:\dos\keyboard.sys
in your AUTOEXEC.BAT file. KEYB replaces the ROM BIOS INT 09h keyboard
interrupt handler with its own routine. This may allow handling of the
keyboard in a manner that does not conflict with A20 handling.