Sun 3/50 and Shoebox

From: Frank McConnell <fmc_at_reanimators.org>
Date: Sat Feb 7 15:15:45 1998

"Richard A. Cini" <rcini_at_email.msn.com> wrote:
> I don't have a Sun keyboard or mouse, so what are the
> terminal-equivalent keys for L1?

Oh. Never mind L1-A (or stop-A on newer keyboards), just press the
break key.

> I've tried the "b sd(0,0,0)" command from the montior in DIAG mode, but
> it complains that the device is not present. I don't have a SCSI terminator
> on the end of the chain, so that may be an issue (the shoebox did not come
> with one; I ordered one :-)).

Yep, it does want to see one. Something that you may want to look out
for: some Suns (including the 3/50 and 3/60 I think) do not supply
termination power on the bus. And some of these short the termination
power line on the bus to ground, which can lead to fireworks of one
sort or another if another device on the bus is trying to supply
termination power over the bus to an external terminator.

So you may want to do something like open that disk/tape box up,
declare one device to be "on the end" of the SCSI bus, install the
appropriate termination resistors on that device, and get that device
to provide termination power to its resistors but not to the bus.

Confused yet? Good.

-Frank McConnell
Received on Sat Feb 07 1998 - 15:15:45 GMT