John Poltorak wrote in a message to All:

 JP> The machine is an 486 DX 25MHz IBM PS/2 8595-AJD with a
 JP> Fast/Wide SCSI-2 controller and 4GB disk. Everything works
 JP> fine in 16MB but when I add any memory the system won't boot
 JP> properly - I get a SYS0693 msg at the point where WPS would
 JP> normally start. This happens whilst using the IBM2SCSI.ADD
 JP> device driver. If I REM this out, the machine boots normally
 JP> and I can use all the installed memory. Unfortunately,
 JP> without this device driver I cannot access my DAT, CD-ROM or
 JP> Optical drive.

Your POS info is wrong.  IBM2SCSI.ADD checks bit 12 of the slot size field
in the POS info in order to determine if the card is in a 16-bit or 32-bit
slot and accordingly either disables or enables access to memory above 16
MB.  If your ADF was wrong, it is possible that this information would be
wrong.

 JP> Does anyone know of any utility I can use to try and trace
 JP> what is happening? 

You can use the /TR switch on IBM2SCSI.ADD to enable tracing, and you can
emit debugging information out COM1 or COM2 with the /C1 or /C2 switches. 
You should also try striking the Alt-F2 key when the white box and
"OS/2" appears at the very beginning of the boot sequence; this
will display the names of device drivers as they are loaded.  The SYS0693
error message is emitted only by HPFS.IFS, not by WPS.

 JP> IBM's OS/2 support people have run out of ideas, and are
 JP> suggesting a hardware error, although my PS/2 diagnostics
 JP> have not revealed anything. 

You're not going to believe this, but what happens if you use the /LED
switch? This has to do with the display panel on the Model 95.

This is not a programming question, so drop me some netmail and let me know
how you made out.
 
-- Mike


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