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ZX21

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@fordp2002

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KiCad projectAll 103 files, ready to open in KiCad15 MB
For fabricationGerbers, drill, pick-and-place and BOMGerbers and drill zip237 KBGerbers and drill zip: ESP32-Footprints14 KBPick and place (CSV)11 KBPick and place (CSV): ESP32-Footprints35 BPCB BOM CSV (PCB SVG)8.4 KBPCB BOM CSV (PCB SVG: ESP32-Footprints)50 B
3D modelThe board with its parts, for an enclosure (GLB)22 MB
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README

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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