ZX Spectrum +2A/2B, +3/3B

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Hardware

Common hardware specifications
  • Processor: Zilog Z80A microprocessor clocked at 3.5469MHz.
  • ROM: 64KB ROM. 2*32KB EPROM arranged in 4 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 with metal springs, operating a plastic membrane.
  • I/O: Software controlled RS232 serial port. AUX Port. Tape In (ear) and Tape Out (mic). Two Sinclair SJS Joystick Ports. Parallel Printer Port
+3 specific hardware
  • Floppy Disc Controller: Zilog Z0765A (uPD765A).
  • I/O: "Disk B:" External disk drive connector.
Black +2 specific hardware
  • Cassette interface daughterboard.
  • "Datacorder" cassette mechanism.