17 Oct
1999
17 Oct
'99
6:02 a.m.
--- daniel <daniel(a)internet.look.ca> wrote:
I'm not sure I have one of those.
>> One of the other interesting items are a
M7260/M7261 pair...
Actually the 11/05 and the 11/10 have two different
backplanes (as I have
both) and the cards are fitted differently in each one. Keep your H214
memory and G231/G110 core drivers.. The 11/05 uses that for it's own memory.
The older 11/05 backplane did not use +15V either!
Given where this stuff came from (there's an inventory sticker glued to the
back of one of the CPU boards of the company I rescued it from), that all
makes sense.
Which CPU boards do you have. It's easy to tell.
Does one of them have a
rotary switch to set the baud rate?
It's not in front of me, but I do rememeber spotting one of those button
rotaries on there and wondering what it was for. I recovnize it as usually
being for baud rate, but I was guessing it was some kind of timing adjustment.
To get an 11/05 running you need:
To jump in out of turn, IIRC, this particular unit also came to me with
an RX11 controller.
M7260
M7261
Check.
G231 X 2
G110 X 2
H214 X2
Well... I've only got 16K
G727 (grant)
I have crates of those, including several "Grantasaurous Rex" cards, the
original third-party double grant card (NPR plus the other three). I should
scan one. For those that haven't seen them, they have no colored handle, but
the PCB is but into a soft-edged T-handle with a dinosaur silkscreened in
red on the "component" side. Somewhere, I still have the original artwork.
Software Results Corp made and shipped one with every COMBOARD(R)
You don't need a console serial board (M7800) as
that was built into the CPU
board.
I didn't know that. I take it that it uses the standard DL11 cable?
You can tell the year of the PDP 11/05 CPU set by:
74 - if the back of the boards are green (solder masked)
Bingo.
I have restored many PDP 11/05s for
"collectors" - yes, at $875 a pop!
Stunning.
I have about 5-6 cpu sets, 1 is beta.
Interesting.
> Finally,
we come to an RK11D board set... M7254 through M7257.
I have two sets of these and
run 8 RK05s, again, restored many of these. You
need a RK11-D backplane. You can hand wire one (yes I know many who have for
UNIBUS operation
I can probably come up with the goodies to do that. I have the remnants
of a PDP-8/L that came as parts with the first one I got... the chassis was
broken (mounting bar in the front), the front panel scavenged, no core and
obviously broken wires on the backplane. I wish I hadn't now, but I did
remove the remaining wires from the backplane (one at a time, documenting
them because it was the only way at the time to try and understand how the
other one worked). The end result is that I have a set of DEC backplane
blocks I could wire into a different configuration. I recycled the stamped
metal bus strips on a couple segments into the upper address bits on a BA11N
way back. DEC used to sell that stuff by the foot. I'd love to get a spool
of it (Ha!)
The best backplane I have is from someone who
completely modified a PDP
11/05 (16K backplane).He took out the second core memory set and completely
hand wired the RK11-D on it. Yikes. It works and I still have the plane if
you are interested in the wire list to do that.
Wow. Much work. I'll get back to you if I can't find an RK11D backplane.
The PDP 11/05 needs AClow, DClow,5V, -15V.
The newer ones required +15V.
Muchas Gracias.
-ethan
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