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40 Years after the Sinclair ZX81 was released this project aims to preserve the first 4 chip computer

BSD-3-Clause license

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Name		Name	Last commit message	Last commit date
Latest commit History 34 Commits
Composite Video		Composite Video
Datasheets		Datasheets
KiCad/ZX21		KiCad/ZX21
Schematic		Schematic
LICENSE		LICENSE
README.md		README.md

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ZX21

40 Years after the Sinclair ZX81 was released this project aims to preserve the first 4 chip computer

This a computer presevation project for the Sinclair ZX81.

Features (Hopefully).

Drop in replacement for a ZX81
Built in 16K RAM, no need for a RAM Pack
Built in Composite Video Output
Barrel Jack power input, center Positive
OPTION: Single Joystick port (not compatible with quickfire etc.)
OPTION: Switchable to 1K RAM
OPTION: Back Porch Support for early ULAs
OPTION: Built in support for ZX-Wespi
OPTION: ZON-X Compatible Yamaha YM2149F Based Sound
OPTION: Switchable between Sinclair ROM OR AT28C256 EEPROM
OPTION: 16 Pin Box Header for DK'Tronics Keyboard

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40 Years after the Sinclair ZX81 was released this project aims to preserve the first 4 chip computer

sinclair pcb z80 kicad pcb-layout zx81

BSD-3-Clause license

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