ZX81 Technical Section
ZX81 Board Information
Schematics, Component layouts and port/connector pin-outs
|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|
Disassembly of ROM code and other firmware-related articles.
|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||-|
Original documents written by third-party manufacturers of Sinclair peripherals.
|Sinclair 16K RAM Pack Board Schematics||The technical schematic diagram of the Sinclair 16K RAM Pack||-|