Plessey "PDP-11"

From: Jerome Fine <jhfine_at_idirect.com>
Date: Tue Aug 28 18:13:50 2001

>Pete Turnbull wrote:

> I've acquired a Plessey PDP-11 clone, which has a KDJ11-AC and a bunch of
> Plessey boards (no other original DEC parts). I was interested in it
> because it has a full install of RT11 V4.00 and TSX-11, and it has a SCSI
> (or maybe just SASI) card in it. However, it has no documentation :-( It
> also has no floppy, just a winchester and an ancient QIC tape drive.
>
> Has anyone got any information on the Plessey cards in this machine?

Jerome Fine replies:

I may have one of these as well - it sounds similar. I have not used it in
about 4 years. It is too slow (I have only an 11/23) and has too little
disk drive capacity compared to the system in a BA123 box that I
acquired somewhat later. There is a program that goes on the QIC
tape to make a backup of the RL02 plus there is an RT-11 V4.00
device driver for the tape drive.

At one point I added the DEC RX02 controller and the RX02 drive.

I don't know how much longer I will keep it. Anyone willing to pick
it up in Toronto.

Also, I just received an 11/93 system board with 2 MBytes of memory
and a KXJ11-CA (M8981-AA and M7616). I remember reading about
software to use the KXJ11-CA as a co-processor. Can anyone provide
any information?

Also, the cabinet kit for the 11/93 uses one DB25 and 7 DB9 connectors.
But one cable is not separate from the cable going to the front panel. Is
this a problem in a Qbus system?

The 11/94 box is damaged, but there are a number of other boards including:

(a) 91-G41402-C REV B QTLM
(b) Able Computer 10340 - probably a Qnivertor???
(c) M9061
(d) Imperial Technology A4880
(e) Imperial Technology A358 (quantity 2)
(f) M9047 - Qbus Bus Grant cards - many
(g) G7273 - Unibus Bus Grant cards ??? - many
(h) Advanced Computer Communication UPB-HSIO
       93-000484-E Rev A (a two board set)

These boards are available (as is the damaged power supply
and backplane) subject to some sort of compensation for the
person that gave them to me. The boards can be shipped.

Sincerely yours,

Jerome Fine
Received on Tue Aug 28 2001 - 18:13:50 BST