ZX Spectrum +2A/2B, +3/3B: Difference between revisions
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==Hardware== | ==Hardware== | ||
===== | =====Common hardware specifications===== | ||
* Processor: Zilog Z80A microprocessor clocked at 3.5469MHz. | * Processor: Zilog Z80A microprocessor clocked at 3.5469MHz. | ||
* ROM: 64KB ROM. 2*32KB EPROM arranged in 4 pages of 16KB. | * ROM: 64KB ROM. 2*32KB EPROM arranged in 4 pages of 16KB. | ||
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* I/O: Software controlled RS232 serial port. AUX Port. Tape In (ear) and Tape Out (mic). Two Sinclair SJS Joystick Ports. Parallel Printer Port | * 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]]). | * Floppy Disc Controller: Zilog Z0765A ([[uPD765A]]). | ||
* I/O: "Disk B:" External disk drive connector. | * I/O: "Disk B:" External disk drive connector. | ||
===== | =====Black +2 specific hardware===== | ||
* Cassette interface daughterboard. | * Cassette interface daughterboard. | ||
* "Datacorder" cassette mechanism. | * "Datacorder" cassette mechanism. |
Revision as of 19:01, 24 October 2010
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.