11 Oct
2006
11 Oct
'06
6:48 p.m.
Hi folks,
today I digged out some PDP11 modules. I wonder what I can do with them.
A Plessey-labeled Unibus Box with 11/34 front panel (the simple one) is
still waiting to be picked up by me or put to scrap...
Ok, what I found:
* DEC M8265+M8266 (11/34A CPU), M9301 bootstrap/terminator
Question: Is that enough to get the machine going? Do I need anything
else (except memory and a kind of tty interface)? What about the "parity
controller" which I don't have?
Other things you'll need are the backplane (which is not the normal
Unibus-only backplane, some slots are specially wired for the CPU cards),
as you say, memory and a console interface, a terminator (M9302) for the
other end of the bus and grant continuity cards.
You don't need a parity controller unless you have an 18 bit wide RAM
board (i.e. with parity fro each byte) which doesn't have the controller
built-in.
* Plessey PM-DC/11 "status control", P/N 700485-100C
Plessey PM-K11 "disc control", P/N 700490-101E
Plessey PM-K11 "data control", P/N 700475-100B
Plessey PMDC/11 "bus control", P/N 700470-100B
These are four quad wide boards. I have no clue what they are/where good
for. No connectors. Some DIP switches.
If anyone could help me out with some information and/or docs - would
be great.
Those sound like the boards from a Plessy disk controller. Again you need
a special backplane,it's a 4 slot thing. It was mostly RK11-D compatible,
althoghh there were minor differeces in the drive interface (that were
easy to get round).
-tony