help needed: problem with UNIBUS access on my PDP-11/70

From: Ethan Dicks <erd_6502_at_yahoo.com>
Date: Tue Jul 16 17:31:00 2002

--- Tony Duell <ard_at_p850ug1.demon.co.uk> wrote:
> ...Incidentally, leaving the jumper in and putting an NPR-device in the
> slot will also cause 'interesting' problems!

That's what I spent a couple hours debugging, c. 1986 - a new, never-
before-seen-the-light-of-day VAX 11/750 and a TU80 controller. Prior
to that, I'd only ever worked on used VAXen that had previously been
stripped of all NPR wires (since we *sold* DMA Unibus cards and had
as many NPR grant cards as we needed).
 
> That's why when I refit a jumper, I use red wire, to make it easy to
> spot next time!

Good advice. At least use a color other than the typical straw-yellow
wires.

-ethan


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Received on Tue Jul 16 2002 - 17:31:00 BST

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