Retro Isle - Sinclair ZX81 Technical Section

CPC464, 664 and 6128 PCW-SERIES NOTEPAD COMPUTERS PCS

ZX SPECTRUM ZX81 ZX80 CAMBRIDGE Z88 TIMEX-SINCLAIRS QL (QUANTUM LEAP)

C64 AND C128 VIC-20 C16 AND PLUS/4 AMIGA PCS

VCS (2600) 5200 7800 400 AND 800 XL AND XE RANGE LYNX JAGUAR ST RANGE

NES / FAMICOM SNES / SUPER FAMICOM GAME BOY DS NINTENDO 64 GAME CUBE

APPLE ][ CAMPUTERS LYNX DRAGON 32 AND 64 MSX PSION ORGANISER PSION SERIES 3 SEGA MEGADRIVE SEGA SATURN SONY PLAYSTATION HP PALMTOPS

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 -