ZX Spectrum 128

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The Spectrum 128 was the second model of Spectrum; the main improvements over the base model were 128Kb of RAM and an AY-3-8912 sound chip.

The comp.sys.sinclair FAQ contains detailed information on the Spectrum 128, but contains a number of errors/omissions:

  • Reading from port 0x7ffd does produce an effect: the value read (generally the floating bus value) is written back to port 0x7ffd. (This effect does not occur on the +2A/+3).
  • Contended IO does apply to ports in the range 0xc000 to 0xffff if a contended memory page is currently paged in.

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