16 Oct
1999
16 Oct
'99
6:46 p.m.
--- Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
Makes sense.
> One of the other interesting items are a
M7260/M7251 pair...
For the record, the above number is a typo... it should be M7260/M7261 pair.
You need the 11/05 (or 11/10 -- they're the same)
backplane and
frontpanel for these.
I might have a 5.25" 11/05 box at the back of the pile. I probably pulled
the cards to keep them in a better environment.
Finally, we
come to an RK11D board set...
IIRC 3 of the 4 cards in that box are the same as the ones for the
RK11-D. The bus control is different (I think). Oh, RK11-Cs are fun to fix (for suitable values of
'fun'). I learnt about
hard disk controllers, Unibus DMA cycles, etc while tracking down a dead
chip in mine.
I have an ace up my sleeve - I can test basic M-series modules out of
circuit with a chip tester and a harness I built from a test clip and some
ribbon cable. I can clamp the test clip on each chip in turn for cards
like the M216 or M111 etc. Takes second. I did build a FLIP-CHIP tester
for the VIC-20 (the bare boards were available at RatShack), but I never
wrote the software. I wanted to make a table-driven thing with graphical
display of what faulty chips were found, but I never wrote a meta-language
to decribe each signal, in and out, to be able to succinctly list off enough
info to test a few dozen types of boards.
Having the printset is _essential_, though!
Almost always the case.
I have prints for the RK11-C and RK11-D, and the
PDP11/05. I don't think
I have the RKV11-D set anywhere, but it can't be that hard to figure out.
Are these available scanned anywhere? Are you looking for any docs that
we might be able to swap bits on? I don't relish paying to ship slices of
dead trees across the pond.
-ethan
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