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- Quarterdeck Technical Note
-
- Q: Why does my machine with AMI 3.0 BIOS hang when I boot with
- QEMM?
-
- The problem is that the AMI BIOS version 3.0 (dated Feb. 1, 1989)
- contains information that would indicate that the machine is a
- COMPAQ. QEMM detects this and assumes that the machine will be
- fully COMPAQ compatible, and configures its "Shadow RAM" in the
- same way as the COMPAQ.
-
- Machines that use this BIOS do not seem to be compatible with the
- COMPAQ with respect to shadow RAM and so the machine will fail.
-
- The best solution would be to contact the manufacturer of your
- machine and see about getting a BIOS upgrade. Version 3.11
- apparently fixes the problem. One manufacturer (Northgate) is
- said to be providing these at no charge to users with this
- problem.
-
- Patch for QEMM.SYS to run on AMI BIOS version 3.0:
-
- Another solution that will get you past the problem as it relates
- to QEMM is to install the following patch on QEMM. DO NOT
- perform this on your only copy of QEMM, incase you make a
- mistake.
-
- First use the DOS utility DEBUG to change QEMM.SYS by typing the
- following:
-
- C:\>debug qemm.sys <Enter>
-
- DEBUG should load and display a "-" as a prompt. Then type:
-
- -s 100 L f000 "COMPAQ"
-
- An address should be returned as below
-
- 4F5F:26BA <- This address will vary, but use what is returned.
-
- then, using the address that was returned (not necessarily the
- one in the following example type the following
-
- -e4f5f:26b0 <Enter>
-
- DEBUG will return the address again, followed by a 43 as follows.
- Enter a zero, followed by the Enter key.
-
- 4f5f:26b0 43 __ <-enter a 0 here and hit Enter
-
- Then enter W to write out the changed file
-
- -w <Enter>
-
- Type Q to exit DEBUG
-
- -q <Enter>
-
- Then reboot and give it a try.
-
-
- Copyright (C) 1990 by Quarterdeck Office Systems
- * * * E N D O F F I L E * * *