PDP-8/M Rebuild – Job checklist
To ensure nothing gets missed, I use a checklist of tasks to be done when rebuilding machines. This is the the list for my 8/M rebuild:
Completed
- Perform a general appraisal of machine
- Photograph machine in detail
- Remove console and cards
- Remove power supply
- Remove wiring looms and any other remaining items attached to chassis
- Remove backplane
- Clean and sand chassis
- Spray chassis to primer
- Rub down primer
- Respray chassis (to matt black)
- Clean backplane
- Clean wiring loom and other chassis furniture
- Take detailed pictures of power supply
- Dismantle PSU
- Clean power supply components
- Remove and reform capacitors
- Reassemble power supply
- Bench test power supply and confirm operation
- Reinstall power supply (but do not reconnect AC or DC at this point)
- Reinstall backplane
- Reinstall chassis furniture
- Power on and confirm fans are operational
- Reconnect AC to power supply and confirm operation of PSU
- Reconnect DC from power supply to backplane and confirm voltages on backplane
- Install minimal card set (console and CPU) and test console operation
To Do
- Add further earth straps – they appeared to be non existent when I got the machine and I’m far from convinced the chassis is earthed at the moment
- Tidy up DC wiring loom
- Configure and fit core memory
- Debug console to establish why address bit 5 isn’t working
- Confirm correct operation of the console
- Enter basic test programs and confirm operation
- Solve problem of some console keys catching on console plexi
- Repair 3 console keys that having broken pivot shafts
- Fit console and confirm operation
- Fit RX8E and confirm its working

















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