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The Sinclair ZX81 home computer, released by Sinclair Research in 1981, was the follow up to the company's ZX80. The case was black, with a membrane keyboard; the machine's distinctive appearance was the work of industrial designer Rick Dickinson. Video output, as in the ZX80, was to a television set, and saving and loading programs was via an ordinary home audio tape recorder to magnetic audio tapes. It was very significant historically because it was the first home computer under $100 USD (in kit form), and therefore was a big volume seller. Business Cards - 70% Off. A US-only version was produced by Timex as the "Timex Sinclair 1000".

General description

As with the ZX80, the processor was a NEC Zilog Z80-compatible, running at a clock rate of 3. 25 MHz. The system board had been redesigned with a custom chip and now had only four or five chips: a Z80A microprocessor, a custom logic chip (Ferranti ULA) or ASIC, a 2364 8Kx8 bit ROM chip, and either one 4118 1Kx8 bit or two 2114 1Kx4 bit RAM chips. The system ROM had grown to 8 KB in size, and the BASIC now supported floating point arithmetic. 30%-60% OFF INKJET CARTRIDGES! - at Inkjetscom.