"Christopher W. Curtis" <[EMAIL PROTECTED]> writes:
> UDB (adaptor - id7)
> 3ft external HD50 cable to external CD-R (id2)
> 6ft external HD50 cable to secondary case
That's the problem. You may use 3 m (9 ft) cable for up to four devices,
taking into account the host adaptor. That went okay for your four
devices (i. e. IBM + 1 Seagate HDD + Tape + UDB).
> secondary case to ribbon cable
> cable:
> IBM HDD (id0, TERM)
> Seagate Tape (id1)
> Seagate HDD (id3)
> (new stuff:)
> Seagate HDD (id6)
> Seagate HDD (id5)
> Seagate HDD (id4)
Now, if you have more than four devices (you have seven), the maximum
allowed bus length decreases to 1.5 m (5 ft) overall. (That is not the
length of a part, but adding together internal + external cables plus
anything). I'm not that sure about Alpha hardware, yet, I know that
there is at least one Ultra SCSI device, I assume the new Seagate are
Ultra SCSI as well, so since there is at least one device, the entire
cabling needs to satisfy Ultra SCSI requirements, even though your host
adaptor does not support Ultra SCSI.
If nothing else helps, get another of those NCR53C810A (or better, get a
53C860 since that's Ultra SCSI capable).
--
Matthias Andree
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