PDP-12 Restoration at the RICM

Jay Jaeger cube1 at charter.net
Fri May 29 08:20:17 CDT 2015

If you haven't yet found one, I have spares for the switch cover - I
have an entire console and the backplanes (with the cards) whose machine
was disassembled out from underneath them.


On 5/10/2015 9:45 AM, Michael Thompson wrote:
> Sorry, I sent the message before I was finished.
> The CRT in the VR14 has severe screen rot. Hopefully we can find a
> replacement CRT, or get some help with removing the outer layer of glass.
> One of the lime green switches on the front panel has broken pivots. Anyone
> have a spare?
> On Sun, May 10, 2015 at 10:42 AM, Michael Thompson <
> michael.99.thompson at gmail.com> wrote:
>> The RICM is restoring a PDP-12. This system was manufactured in December
>> of 1972, so it is very late in the life of the PDP-12. The Priority
>> Interrupt and the Data Multiplexer are hardwired in two extra columns in
>> the processor chassis. These options were in separate chassis in earlier
>> models. It came with an Omnibus expansion chassis that connects to the
>> Posibus from the PDP-12. The LP01, RK05, and PC04 controllers are in the
>> Omnibus chassis. The VR14 and TU56 controllers are in the processor
>> chassis. We got the LP01 too.
>> The donor did a great job of preserving the machine, and has all of the
>> original documentation and software. The processor and RK8-F prints are
>> newer than what I can find on the Web, so I will scan them and send the
>> PDFs to Bitsavers.
>> Yesterday we reformed the caps in the power supply and powered it on for
>> the first time in 24 years. It is going to need some debugging, but it does
>> show some signs of life.
>> The CRT in the VR14
>> --
>> Michael Thompson

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