18 Aug
2025
18 Aug
'25
10:06 a.m.
AyAlthough I've never seen one in the wild, the 8/S has always intrigued
me. I would love to see a cycle accurate emulator of one. Wish I could do
it myself but that's way out of my wheelhouse.
RayRay the Emulation Guy
On Sun, Aug 17, 2025, 5:26 PM Tom Hunter via cctalk <cctalk(a)classiccmp.org>
wrote:
I forgot to say that my PDP-8/s has serial number 296
which means it uses
the "8k core module" which has only 4k core populated. Below serial number
200 the PDP-8/s were delivered with the "4k core module" which is somewhat
different in both backplane layout and electronically.
On Sun, Aug 17, 2025 at 12:02 PM Tom Hunter <ccth6600(a)gmail.com> wrote:
I have recently bought a DEC PDP-8/s. It
hasn't been powered on for about
40 years before I got it. I cleaned it and did some repairs on it (glued
broken flip-chip handles, replaced all front panel lights, restored the
acrylic front panel to as new condition and built a new switch mode power
supply for +10V and -15V).
After testing each flip-chip individually for dead shorts on the power
rails I reassembled the flip-chips into the backplane and on power up it
shows signs of life, but has a number of problems I will have to debug
and
fix.
Does anyone here have the original Engineering Drawings or good PDF scans
of the drawings?
There are reduced copies of the PDP-8/s Engineering Drawings in Appendix
A
of the two PDP-8/s Maintenance Manuals on
Bitsavers, but I have not been
able to find scans of the actual Engineering Drawings. Some details in
the
reduced copies in Appendix A are not legible.
Thank you
Tom