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ZX81 Specifications


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Firmware:

3.25 MHz Zilog Z80A CPU

  8K ROM, 1K RAM externally expandable to 64K (56K usable)
Display: 24 lines x 32 character text display
  Monochrome only
Sound: None
I/O: Z80 bus, 250 baud cassette interface, UHF television out
Storage: External cassette recorder
Chris Owen 1994-2003