Q-bus pinout

From: Chuck McManis <cmcmanis_at_mcmanis.com>
Date: Thu Apr 8 23:02:12 1999

At 01:37 AM 4/9/99 +0100, you wrote:
>Surely an extender card simply links the edge fingers at one end of the
>board to the socket at the other. It shouldn't be bus-specific.

As it turns out, this one is a UNIBUS extender and one of its features is
that it connects the ground pins to an internal ground plane in the card.
Unfortunately those aren't the ground pins on Q or OMNIBUS so it only works
in a UNIBUS machine. AA2,AC2, and AP1 are all connected together on the
internal ground plane. As are the BA2, BC2, and BP1, etc.

>I have used the same quad-height extender for SPCs, RK07 cards, Q-bus
>cards, Omnibus cards, etc. No problems.

I guess I need to find such a card.

>I have the schematic. The pins of the 2 output connectors (J3 and J4) are
>simply wired in parallel, so if one works and the other doesn't, it must
>be a broken connection somewhere. Shouldn't be hard to check.

Hmmm, curious, the +5V on the second back plane is like 1.5v (and no
obvious signs of smoke that would be apparent if something were shorting it
out back there) I'll check the connectors as they are pretty easy to get at.

--Chuck
Received on Thu Apr 08 1999 - 23:02:12 BST

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