ZX Spectrum 128K

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Revision as of 20:26, 24 October 2010 by Guesser (talk | contribs) (→‎Timings)
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For other models of 128K Spectrum see ZX Spectrum 128K models


  • Processor: Zilog Z80A microprocessor clocked at 3.5469MHz.
  • ROM: 32KB ROM, arranged in 2 pages of 16KB.
  • RAM: 128KB of Dynamic RAM, arranged in 8 pages of 16KB.
  • Graphics: 256 x 129 pixels, 16 colours, attribute based. See Spectrum Video Modes.
  • Sound: AY-3-8912 3 channel, 8 octave Programmable Sound Generator and "beeper". Modulated onto video signal.
  • Keyboard: 58 plastic keys above a rubber pad and plastic membrane. Optional editor keypad.
  • I/O: Software controlled RS232 serial port. Keypad Port. Tape In (ear) and Tape Out (mic).


Memory timings and contention are described in detail in the contended memory article