Thanks Steve.
It appears that there is only one SCSI adaptor in this machine. I know that it works as it is currently configured under SCO and can access the CD no problem. I thought about IDE myself, but it appears that although the BIOS supports it there's no actual connector

I think the problem may be the Linux driver for the Mylex unit. From a quick read at the docs it appears that it only expects to find RAID units attached, not a CD ROM!
I've tried all versions of SME from 4.0 upwards (don't think I ever throw out a cd

). None of them can access the CD.
Looks like this machine could be heading for the skip

Richard