I'm not sure whether the BIOS is installed when you have no HDD connected.

Have you tried the ASPI8XX.SYS drivers in version 4.11.00 ?

I don't have them at hand, but I have done some experiments with SDMS drivers in 2021.
INT13 Extensions to SDMS 3.0 & 4.0 - SCSI by NCR / Symbios Logic / LSI Logic

Do you mean I also need to have an internal SCSI hard disk connected on the chain to get this setup to work? I only intend to use a SCSI CD-ROM. Version 4.00.00 caused my system to hang. Version 3.02 did not, so it stands to reason I that I should use the 3.02 version.

Thanks.

I just thought about a SDMS BIOS won't be installed without hard disk.
I haven't investigated this issue.
I think 3.xx drivers maybe don't load without BIOS, as read in your message.
Please just try the 4.xx driver stack with your old BIOS.

There is a page in my BIOS settings dedicated to the NCR SCSI. I have it set to 'Enabled' and it is set to 'Master'. I have assigned the IRQ 15.

Never use full CAM support driver last 20 years.
I use minicam.sys + cdrom.sys from v.3.x drivers set.
DEVICE=C:<PATH>MINICAM.SYS
DEVICE=C:<PATH>CDROM.SYS /D:NAME

My v3.02 driver package does not have a file called minicam.sys.

Richy1985 wrote on 2026-09-20, 16:44:

My v3.02 driver package does not have a file called minicam.sys.

You can also use doscam.sys at the disadvantage that it uses a much bigger amount of conventional memory with no advantage for your use case. This should at least confirm whether your configuration works at all.

Maybe try the Retroweb driver set for the board? https://theretroweb.com/motherboards/s/unknown-dt-pci-viglen

Not got any experience with that SCSI controller.
But this is in a era where controllers seem to like to ignore certain CDROM drives because you seem to be loading all the right drivers, but theres nothing there.

Richy1985 wrote on 2026-09-20, 16:44:

My v3.02 driver package does not have a file called minicam.sys.

https://vogonsdrivers.com/getfile.php?fileid= … menustate=76,71