ZX Spectrum 128

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  • This article is about the "toastrack" 128K model. For other Spectrum models with 128K of RAM see ZX Spectrum 128K models
Infobox: ZX Spectrum 128
Manufacturer Sinclair Research / Investrónica
Mfg. volume
CPU Z80A @ 3.5469MHz
ROM 32kB
RAM 128kB
as pages 8*16kB
Gfx Res 256x192
Gfx Colours 15 (2 per 8x8 cell)


  • 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 192 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).



The memory space of the Spectrum+ 128K is divided into four 16k pages. The 32k of ROM and 128k of RAM can be paged into the memory space as shown in the diagram below: Template:Spectrum 128k memory map