Another PDP-11 available: Wisconsin

From: Bill Bradford <mrbill_at_mrbill.net>
Date: Mon Oct 9 17:25:43 2000

(another mail sent to me _at_ pdp11.org that I'm not personally able to
 save/salvage - perhaps someone else here can? --bill )

If interested in this system, please email Tom at
the e-mail address given below. He'd like to see his
PDP-11 system go to a good home.

He's asking $100 plus shipping for the lot.

 - - -
My first home computer was a LSI-11: A Netcom box (card cage) with Diablo
emulations of RK05 drives. I ran RT-11 3, then version 4, and I may have
actually genned a v5 system for it. Still have it in storage, need to get
rid of it.

I don't know if the processor is an LSI 11 or 11/02. It's QBUS. I think I
have assorted serial and parallel cards installed. I made a 8" floppy
subsystem based on a heathkit card, built into the most incredibly ugly
plywood box. I have 3 working diablo drives and a 4th that has serious
electrical problems, but the heads are good.

The original bootstrap/terminator card used a charge pump/inverter chip to
provide negative 12v for the boot prom, but it never came up fast enough
and you always got dumped to the _at_ prompt at power-up. Type 173000g and off
you go - but that wasn't good enough for me. I hid a little transformer,
bridge, and capacitor behind the backplane, and maybe a 7912 regulator (can't
remember) and thereafter, it takes off from power-up without help.

It has a Digital Pathways TCU-50 clock card, but the batteries are
probably long dead, and you have to hard-code the year into the fortran
/ macro program that reads the hardware clock and sets the RT-11 time/date,
which meant a small edit and recompile every January. I have a compiler and
assembler. I've got an armload of RK05 packs for it.

This pup is a real dinosaur. Please help!

Thomas M. Peters
<Peters.Tom.M_at_MBCO.COM>
(414) 931-3887

-- 
Bill Bradford * KD5LQR
  mrbill_at_mrbill.net
    Austin, TX
Received on Mon Oct 09 2000 - 17:25:43 BST

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