Circuit schematics
Amiga and Spectrum boards, power supplies and keyboards, redrawn by people who share them under a free licence. Open them here, zoom in to the component and download the PDF.
- 11
- 23
- 8
These are third-party redraws and may contain mistakes: always check against the board before you touch it. Never work on a power supply or a monitor while it is plugged in, and don't open the 230 V side.
Commodore Amiga
Amiga 1000328015-01 rev. 1.1
A single-sheet redraw, made to follow the original as closely as possible.
- Jeremy Kellogg
- MIT
Amiga 2000rev 6.2
Redrawn in KiCad from the scanned schematics, over 13 sheets. The first sheet notes that pins 18 and 19 of the XX4256-15 are swapped in the original scans.
- rhaamo
- CC0 1.0
Amiga 500312503-02
Traced from a real power supply, and the author warns it has not been validated. It also shows the 230 V side: it is there to understand the supply, not to open it.
- CoconutSmarts
- Unlicense
Amiga 500Open Amiga 500 Fast RAM
A new memory expansion for the A500's trapdoor. It is not a copy of the A501.
- SukkoPera
- CERN-OHL 1.2
Sinclair
ZX Spectrum 16K/48KIssue 2
Redrawn from photos of a board and the known schematic. It includes the most common factory fixes, so it is not exactly the drawing as it left Sinclair.
- liveboxandy
- CC0 1.0
ZX48K Essentials
A modern version of the Spectrum 48K, designed from scratch. It helps to understand the circuit, but it is not the original board.
- Tomek Szafrański
- CERN-OHL-S 2.0
Sinclair QLIssue 5
Redrawn from photos of real boards. The author says the drawing is complete but has not been tested.
- Álvaro Alea
- CERN-OHL-S 2.0
Sinclair QLIssue 6
Redrawn from photos of real boards. The author says the drawing is complete but has not been tested.
- Álvaro Alea
- CERN-OHL-S 2.0
ZX81
A new mechanical keyboard for the ZX81, electrically the same as the original: the same key matrix.
- Brian Swetland
- MIT
Elsewhere
These are not hosted here. Some are copies of the original Commodore and Sinclair schematics, which are still owned by someone; for others the licence doesn't allow it or the author doesn't say which licence applies. Here are the links.
- A500, A500+, A600, A1200, A2000, A3000, A4000, CD32, CDTVamigawiki.org ↗
- Rämixx500 (A500+)SukkoPera · GitHub ↗
- A600A600Reborn · GitHub ↗
- +2A/+3, +2B, +3Bzxnet.co.uk ↗
- 16K/48K, 128, +2, +2A/+3, ZX81Spectrum for Everyone ↗
- ZX Spectrum 48K Issue 3BPCBWay ↗
- ZX81 Issue Onebit-preserve · GitHub ↗
- ZX80TankedThomas · GitHub ↗
About the licences
Each schematic keeps its author's licence, and the PDF is the author's original, unchanged. The sheet images were generated from that PDF so you can view them here. If you are the author of one of these schematics and want us to correct or remove it, write to us. Contact →