20 Mar
2000
20 Mar
'00
10:38 a.m.
----- Original Message -----
From: "Tony Duell" <ard(a)p850ug1.demon.co.uk>
To: <classiccmp(a)classiccmp.org>
Sent: Tuesday, March 21, 2000 9:14 AM
Subject: Re: DEC RAxx drive
OK, as I understand it...
Black cables do a mirror flip between the 2 ends. White cables don't.
Bulkhead adapters (obviously) do a mirror flip.
Now what I can't remember is whether you need a
mirror flip between
the
controller and the drive (-> an odd number total of
bulkheads and
black
cables) or not. What I can remember is that whatever
combination you
have
doesn't work :-), and it's necessary to swap
cable types until it
does.
I've never actually had a problem with this.
My cabinets come out to ports on the bulkhead of the cabinet.
(RA7x and RA9x drives, - same for RA82's when I was still running them.
They are, (rummage, rummage) uh, ok, the connectors for the SA70
enclosures
that hold the RA7x drives are a white cable with a 37 pin d connector
that fans out
to 4 SDI bulkhead connectors. I put a black cable from there to either
a
KDB50 or the HSC70 and they work.
The RA8x drive cabinet cables are black, and go to a bulkhead connector.
Black from there to
the HSC or KDB50 works.
I have another RA9x cabinet at home but I *think* it has white cables in
it, I'll take a look later.
Black cable from there to the HSC or KDB50.
ISTR that I have also gone direct from an RA90 with a black cable to a
KDB50, and that worked too.
Are you not holding your mouth at the correct angle? ;^)
I've tried to make sense of the cable part no's, but there seems to be
several (length is a factor obviously)
different numbers and it's hard to tell what's what.
Cheers
Geoff Roberts
Computer Systems Manager
Saint Mark's College
Port Pirie,
South Australia
geoffrob(a)stmarks.pp.catholic.edu.au
netcafe(a)pirie.mtx.net.au
ICQ: 1970476