21 May
2007
21 May
'07
5:19 p.m.
On Monday 21 May 2007 04:34, Johnny Billquist wrote:
Patrick Finnegan <pat at computer-refuge.org>
skrev:
I'd agree, but the case quite clearly has a Digital logo on it, an 11/94
placard, and has a note on the side that it was upgraded to an 11/94
On Saturday 19 May 2007 06:35, Johnny Billquist
wrote:
My "11/94" (which was an upgraded 11/84, and which I got CPU-less)
actually does have a QBUS... it's got an Able Qniverter to hook
the UNIBUS in the chassis to the QBUS from the CPU, and both QBUS
and UNIBUS peripherals.
Does anyone know how common that was? I don't see any evidence
pointing towards it not being designed that way by DEC. The
chassis is DEC badged, with a label on the side indicating that it
was upgraded from an 11/84 to be an 11/94 at some point.
Pat, what you have is what I would describe as an 11/93 with an
Qniverter. That will not be exactly the same thing as an 11/94.
The KTJ11-B, which is DECs Unibus adapter, have some special signals
to the CPU telling it that the KTJ11 is there, and that changes the
behaviour of the Qbus, according to the manuals. from an 11/84. I see no evidence that DEC didn't
sell this machine as
it currently is configured, as an 11/94 (or 11/84).
One more interesting bit about it is the QBUS backplane... the first 3
slots are quad-width Q/CD slots for the memory and CPU, and the rest of
the slots (quite a few, maybe 6 or 8?) are hex-width slots that are Q/Q
serpentine on the left 4 fingers, and CD on the right 2 fingers.
Pat
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