PDP-12 Restoration at the RICM

Paul Anderson useddec at gmail.com
Sun May 10 15:13:31 CDT 2015

Sounds great. Did the newer PDP-12s come with a VR14? I thought most came
with a VR12.

I would love to have a LP01 if anyone out there has one they don't need.


On Sun, May 10, 2015 at 9:42 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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