> The last board is a 919 UNIBUS connector with long cable connecting
> into another drawer.  That one is a backplane of unknown nature.  It
> has one card to play the UNIBUS adapter, then a whole bunch of
> MEGATEK cards all together making up a frame-buffer and digitizer
> assembly that was used for a SCICARDS circuit layout system.  Any
> shred of information about this would be appreciated.  I don't think
> its UNIBUS or QBUS (no grants between the two clusters of cards.)

Quite likely.  I know in years past, I worked with a unibus VAX that
had a drum transparency scanner attached.  (It was a really nice
scanner, too; if I'd had hardware interface docs and space, I'd've
snagged it on its way out.)  This is relevant because the interface to
it consisted of a section of what looked like unibus backplane that had
been completely rewired (or perhaps it started as bare card-edge
connectors and calling it _re_wired is inappropriate :-).  There were a
half-dozen or so boards that had to be plugged into this special
section of backplane, each in the right slot.

It wouldn't surprise me a bit if your framebuffer/digitizer was done
similarly.

Ah, working with the 780 and 750.  Those were the days.

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