Sinclair ZX81

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Manufacturer	Sinclair Research Ltd.
Model	ZX81, shown with ZX Rampack and ZX Printer.
Age	Introduced 1981
Service Data	Original user manual and documentation
Condition	Working, still in original box.
Dimensions	About 8" square (200mm x 200mm)
Comments	The ZX81 was introduced hot on the heels of the ZX80, and was considerably cheaper, as a single VLSI chip had been used to replace about 16 integrated circuits from the ZX80. Storage was still to cassette, and video to a TV set. The Rampack added an extra 16K to the internal 1K, and the printer used a special thermal paper (it also needed a larger power supply). The RAMpack and printer