On Sun, 2005-07-03 at 12:57 -0700, Vintage Computer Festival wrote:
However, the termination is something that I've
been concerned with.
Howard used it with a short (~3ft) SCSI cable. I'm using it with a longer
(~6ft) cable. The tape drive has two 50-pin IDC connectors on the back.
There's a ribbon cable coming out of one of the connectors with two
amphenol connectors on the end. One amphenol connector is terminated, and
the other is connected to my SCSI cable, which is then connected to my
SCSI interface on the PC.
Umm, that's plain wrong.
SCSI's just a single bus which needs to be terminated at each end,
nowhere inbetween. The controller can be anywhere physically on the bus
so long as termination rules are observed. It really is that simple.
Sounds like what you have is something where one end of the bus is
terminated *before* the last device (the tape drive). That *might* just
work (often with the odd data error during use) on a short cable or at a
low speed, but it's still wrong.
Not sure what controller you're using, but you might need to drop the
transfer rate in the BIOS too for that particular device if it's a bit
old and clunky.
I've never worked out why people think SCSI's so complex - it's always
seemed easy to me; the only hassle is tracing oddball data faults when
running close to the limit of performance and with a fully loaded bus.
I have (or at least I think I have) a terminator that
will plug into a
50-pin IDC type connector, but I can't find it. I'm hoping that fixing
this cabling mess will solve the problem.
Does the drive not have termination built-in that's activated by a
jumper? That's reasonably common, even on really old drives. Worst case,
grab any old SCSI disk that can also do termination and put *that* at
the end of the bus 'past' the tape drive; power it from an old PC PSU or
something. (as someone else has suggested)
I'll try again, though at this point I'd
rather be shot in the head.
it's easy :) Seriously, I've always had more trouble with IDE setups
than I have with SCSI (usually because the drives / cables / controllers
tend to be cheap crap)
have fun!
Jules