VAX 4000-100 QBUS cables

Glen Slick glen.slick at
Tue Nov 29 17:13:44 CST 2016

On Nov 29, 2016 11:44 AM, "Peter Coghlan" <cctalk at> wrote:
> Another thing I noticed is that there are rather more than 50 QBUS signals
> listed on the top right of the circuit diagram.  I guess which ones are
> from the 50 pin D connectors will become apparant when I find a pinout for
> those connectors.  I suppose the power rails and those labeled "spare" are
> likely candidates for omission.

There are *two* 50-pin bus extension cables, not just one. More than enough
signal lines for the 72 card edge fingers on a dual wide card. (18 per 2
sides per the A and B card edge connector positions).

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