DEC PDP-14 Programmable Controller simulator

Paul Anderson useddec at
Wed Apr 5 21:44:20 CDT 2017

I don't know if I have a complete PDP14 left or not, but I have relay
racks, relays (some NIB), a VT14, tons of other parts, and a lot of
documentation. Would any of this help your project?

On Wed, Apr 5, 2017 at 3:05 AM, Christian Gauger-Cosgrove via cctalk <
cctalk at> wrote:

> On 4 April 2017 at 20:21, Charles Dickman via cctalk
> <cctalk at> wrote:
> > I have written a PDP-14 simulator using the simh framework. Paired
> > with a PDP-8 simulator as a front end it passes all the DEC
> > diagnostics. A pointless effort, perhaps, because there isn't much
> > that can be done with it without connecting it to something to
> > control.
> >
> Please release it! I/O access isn't too exceedingly complicated. I
> just finished up a university class on industrial controllers and
> networking, and we covered Modbus RTU and Modbus TCP. The latter
> protocol would prove to be pretty useful for this PDP-14 emulator. The
> emulator would act as one Modbus master and send out packets (in the
> Modbus TCP format) to a remote/distributed I/O unit of the user's own
> provision. Making it generic means it doesn't require specific
> hardware; making it Modbus protocol means it talks to a gigantic swath
> of hardware.
> So, please do submit it to be merged into the SIMH framework, it
> sounds like fun! (And sounds like practice for writing a Modbus TCP
> master… to me.)
> Cheers,
> Christian
> --
> Christian M. Gauger-Cosgrove
> Contact information available upon request.

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