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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

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