A very sad PDP-8/S

Lyle Bickley lbickley at bickleywest.com
Sat Nov 3 00:12:13 CDT 2018

On Sat, 03 Nov 2018 15:13:16 +1100
Guy Dunphy via cctalk <cctalk at classiccmp.org> wrote:

> This is rather sad.
> I've received a PDP-8/S. It turns out to be missing so much, that
> it's probably beyond restoration. Anyone who can think of potential
> ways to find the missing parts, please speak up.
> http://everist.org/pics/PDP-8S/
> Missing:
>  - Front panel PCB, 
>  - Case top AND bottom, 
>  - Power supply.
>  - Some flip-chip slots are empty. Not sure if supposed to be.

I have a restored and running PDP-8/S.

It looks to me that you're not missing modules - the open slots are
for the I/O cables.

The P/S is a standard DEC linear P/S and can be easily substituted until
you come across the real thing.

You need to get the schematics for the version of the PDP-8/S you have
and check the modules in your system against the module chart.

When you say the front panel PCB is missing - do you mean that there
is not a large circuit board with incandescent lamps in the system?
That would seem unusual to me - given that all the switches are on the
front panel.

> Also there's no sign of any I/O circuitry.

There is NO I/O on a PDP-8/S. The I/O cables connected to any I/O that

Please get a PDP-8/S service manual and schematics...

> A curse on slack people who remove stuff from a machine for servicing
> or whatever, then never got around to putting it back. Resulting in
> this kind of tragedy.

I may not be as you think...


73   NM6Y
Bickley Consulting West Inc.

"Black holes are where God is dividing by zero"

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