Here is a corrected version to the previous note
Later I bought a seagate ST277N 60MB SCSI drive. I recall it supported
ProDOS and CP/M perhaps Dos 3.3 as well. I stll have the drive but it
doesn't always spin up.
In order to get the seagate to work on the Xebec controller I definately
needed the SLS rom.
I also recall I think I needed to supply the drive geometry and they
setup the ROM for me.
It was 15+ years ago and that's all I can recall at the moment .. I was
really into SCSI back then ... I even bought and still have the original
SCSI spec document.