The Sinclair ZX80 was introduced in 1980 and only cost £100. It was available preassembled or as a kit for a discounted price. The ZX80 had had a tape storage device, 1 KB of RAM and 4 KB of ROM that held the Sinclair BASIC programming language, and the operating system. Commands were entered into the computer in the same fashion as a scientific calculator, each key had a different function and could be changed by a shift key, of by the context in which it was being used.
The computer’s display shown over an RF connection on a normal television. The display generator used a mixture of of hardware and software to generate a signal. Because of the very minimal configuration of the ZX80, it could only show an image on the display when it wasn’t processing data. Running a program or even typing would cause the display to black out until the processor became idle.
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