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A collection of links to circuit diagrams/schematics
Sinclair Research Computers
Sinclair Branded Amstrad Computers
- Redrawn schematics in PDF format for the Spectrum +2A/+3, +2B, and +3B which fix several errors — based on the schematic from the Amstrad +2B/+3B Service Manual.
- See  for additional notes.
Timex Sinclair/Timex Computer
- Timex/Sinclair 2068 schematic from the Timex Computer Corporation technical reference manual for the 2068.
- SAMS Computerfacts Sinclair/Timex Model 2068 service manual.