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 <[email protected]> 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 > > >
