pdp problems

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Sat Jan 17 17:00:13 2004

> I am having problems with the pdp 11/04 I picked up last week. If I
> power on with the machine without the extra cards, I get output on the
> la36 with a $ prompt. So far so good. But with the card cage connected
> the run light is permenantly on (ie. with halt switched), with no
> output.on anything (There are two rs232, la36 and a display unit)
> So the main questions are :
> what could cause this ?.

Is your terminator an M9302 (I would guess so, that's the normal one for
the 11/04 and 11/34 machines). If so, then this is the classic symptom of
an open grant chain (this has been discussed here many times before).
Perhaps you're missing a grant continuity card, or perhaps there's a
missing NPG wire-wrap jumper.

> It has a dead rk11-d and an untested rk11-c with no power supply unit
> and no case. What sort of power supply runs this, I also picked up about

The original PSU for the RK11-C is an H720 of some flavour.

Received on Sat Jan 17 2004 - 17:00:13 GMT

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