13 May
2016
13 May
'16
2:05 p.m.
QBUS termination is a complex subject; when you have
multiple backplane
sections, connected by cables, each section has 'termination'. That's what
this
REV11-E card is; it's also the QBUS 'out'
to the card in the 780 CPU which
the
console -11 uses to control the /780 CPU. Why it's
in the middle slot, I'm
not
sure (unless things have been moved around)?
Pretty sure they have been moved..
M8044ee
m7946
MSV11-?? (My list doesn't contain an '-EE', but it's some sort of small
memory, Q18)
RXV11 (RX01 8" floppy disk controller)
In theory, the M8044-EE should be an "MSV11-DE" (not "MSV11-EE", that
would
be an M8045-EE), but none of my documentation,
including the M8044 prints,
covers such a variant. Maybe I need to look in the /780 prints, it may be
a
special variant for use in the /780 console machines.
The back of the board says M8045 5013128DP1 32K 18bit MOS memory
M8192
LSI-11/73 CPU; a nice machine, if you can eventually get it running. a bunch more memory (note that the M8044/8045 cards
are Q18, and so you
can only have up to 256KB with them - they _WILL NOT WORK_ in a system
with more than 256KB in it).
The REV-11 isn't needed in this configuration. The boot PROM for this
machine
was actually on the card in the /780 CPU, so
eventually you'll need a
replacement - something like a BDV11 or something (they are available, and
not too expensive).
These all seem to have vanished from E-Bay at present.
Noel