ZX81 Technical Section
ZX81 Board Information
Schematics, Component layouts and port/connector pin-outs
| Title | Description | Date |
|---|---|---|
| ZX81 Board Schematics | The schematic diagram of the ZX81 | - |
| Complete Parts | A view of all the component parts that make up the ZX81 | - |
| Replacing the ZX81's ULA | Some background information on the ULA and links to some sites that have replaced it with discrete components | 13th January 2015 |
ZX81 Firmware
Disassembly of ROM code and other firmware-related articles.
| Title | Description | Date |
|---|---|---|
| ROM Disassembly | The complete ZX81 ROM disassembly | - |
| Z80 Instruction Set | The complete Z80 Assembler list of instructions | - |
| Assembly Language resources for the ZX81 | A resource list for those interested in programming Assembler for the ZX81 | - |
Peripherals
Original documents written by third-party manufacturers of Sinclair peripherals.
| Title | Description | Date |
|---|---|---|
| Sinclair 16K RAM Pack Board Schematics | The technical schematic diagram of the Sinclair 16K RAM Pack | - |