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WAHANG.TXT
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1995-02-26
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3KB
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36 lines
TITLE: 950118 TIMING HANG ON IBM PC 300 SERIES - 486 SYSTEMS AND ON
ALL APTIVA'S FROM THE 310 (2144-22P) THROUGH THE 530
(2144-66P).
DESCRIPTION OF SYMPTOMS:
When the IBM PC 300 Series - 486 Systems BIOS code switched CMOS
banks, OS/2 (and the physical clock Device Driver) did not know
that the CMOS bank was switched. If an IRQ 8 (realtime clock
interrupt) came in when the CMOS bank was switched, then the system
would hang because the clock DD would read the RTC CMOS locations
on the 2nd bank when it should have read them on the 1st bank.
The OS/2 virtual DD (VCMOS.SYS) did not allow writes to CMOS with
addresses < 0Eh. So, the Rapid Resume data could not be written by
a VDM (DOS session or windows). VCMOS.SYS virtualizes ports 70H
and 71H.
RESOLUTION:
VCMOS.SYS will now virtualize ports 22H and 24H when on IBM
PC 300 Series - 486 Systems or Aptiva.
A fix must be applied to the OS/2 system to correct this
problem.
How to apply the fix
In the fixes sent to you will be a file called VCMOS.SYS. After the
install is complete, copy VCMOS.SYS to ?:\OS2\MDOS directory (? is
the drive you installed OS/2 into).
NOTE: Please refer to PDDB Item FFZTV title APTIVA UPDATE.
It has information on how to get the fix.