Good news: Synth Fool! (the web site) is back. Kevin gave me permission to post the missing Oberheim files (basically the 4-voice keyboard schematics) herewhich I never got around to doing. Meanwhile I still need to scan the tech manual. Keep bugging me.

• Schematics (570KB pdf; the SynthFool scan broken into separate pages--easy to browse & print--includes the 4/2-voice PS schematic as a bonus for those who wondered how this thing is powered)
• Manual (includes calibration and mods) [not ready--diagrams are back up at SynthFool]
• The VCO linear detuning mod is here

Two-voice Synthesizer

• Instruction Manual (~ 1MB pdf; novice level, includes some basic theory)
• Mini-Sequencer schematic (720KB; higher-res than the SynthFool scan--thanks Jeff)

Schematics for the SEM-1A, 4/2-voice Power Supply, and the 4-voice keyboard courtesy of SynthFool. Used with permission.

More to come...