And we have people like you that take the time and fix these machines to keep them running, to fill my shoes persey, as I dont have time to do it much anymore. But I digress. I did manage to fix that machine, But I got a board from JDW that acts as if no ROM simm is inserted either. it passed all continuity checks. I think the GLU is bad, as its not switching memory map allocations to access ROM at ADR 0.for SCSI issues I would suggest watching techknights video on youtube.