23 May
2007
23 May
'07
3:18 a.m.
On Tuesday 22 May 2007 17:03, Pete Turnbull wrote:
On 21/05/2007 18:19, Patrick Finnegan wrote:
Well, the system has two backplanes.
The system has two labels on the side... the first is "11/84-HX" and the
second is "PDP-11/94E"
The QBUS backplane has 3 quad-width slots and 6 hex-width slots. It's
labelled:
5018955 01 B1
11/84 QBUS BACKPLANE
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.
That is odd. Can you see a number on the backplane? Does this
machine have two backplanes, one entirely QBus and one entirely
Unibus? If the whole of the CPU backplane is QBus, I sort of agree
with Johnny that it's not a "real" 11/94, although software probably
can't tell the difference. From the labelling, it's definately a DEC
backplane. I can't find any
other (ie Hxxxx) labelling on the backplane.
The UNIBUS backplane is made by ABLE.
According to my manuals, there are two backplanes for
11/84
systems. The Users and Maintenance Guide for the 11/84-A (and -P)
(EK-1184A-MG-001, June 1988) shows a 13-slot H9277A, part number
70-20650-01. The Users and Maintenance Guides for the 11/84-D and -E
(EK-1184D-MG-001, EK-1184E-MG-001, June 1988) show a 9-slot H9277B,
part number 70-17228-01. But in both cases, the slots below slot 4
are Unibus. Specifically, for the 9-slot backplane, the slots are
listed as
Well, the label on the side says it was an 11/84-HX, which isn't any of
the models you listed above...
Pat
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