> 
> One other thing that can cause trouble is that Fast SCSI-2 devices
> sometimes work if they're close to the CPU, but fail when they're out
> on the SCSI chain.   Believe it or not, getting better SCSI cables and
> using active termination can clear up this sort of problem.
> 
Fast SCSI-2 has a thighter spec than previous scsi specs. Don't expect
old cables, both wiring and length, to work with Fast. I don't have
the spec handy so this is from memory but not completely wrong :-)