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?
Here's the layout:
[ DEC KDJ11-AC ] [.....empty.....] [.....empty.....]
[ 705919-001 "MIN 1360" 1MB RAM ] [.....empty.....]
[ 703755-600E ] [ 703330-100L ] [.....empty.....]
[ 703330-100L ] [ 703330-100B ] [.....empty.....]
[ 703330-100C ] [.....empty.....] [.....empty.....]
[.....empty.....] [.....empty.....] [.....empty.....]
[.....empty.....] [.....empty.....] [.....empty.....]
[.....empty.....] [.....empty.....] [.....empty.....]
[ 705200-300E ] [ 703365-100J ] [.....empty.....]
705919-001 is 1MB DRAM. The board is 1/4 populated, with 36 DRAMs.
703755-600 is a tape controller. It's connected by a 50-way ribbon cable
to an Archive Corporation Cartridge Tape Drive, Model 9020L-2. QIC02?
QIC36?
703330-100 is a DLV11-J lookalike. Links and switch settings unknown! I
could probably work out the address and vector switch settings without too
much trouble, since I have four of them set for consecutive addresses, but
I don't know about the rest.
705200-300 is a SCSI (SASI?) disk controller. It appears to emulate an
RLV21 with 4 x RL02, and has a Wren-2 43MB drive on it. It has a couple of
PROMs, one labeled "UK5" and the other "335-100A".
703365-100 has a serial line for the console terminal, connections to the
front panel switches, terminators, a bootstrap (?) made up of 4 x TBP28L22
PROMs, three 8-pole DIL switches and several wire-wrap posts.
Any info/docs welcome, as would be formatting software (or instructions, if
it's built in) for the disk controller...
--
Pete Peter Turnbull
Network Manager
University of York
Received on Mon Aug 27 2001 - 15:48:28 BST