Sinclair ZX Spectrum Family

The ZX Spectrum is an 8-bit home computer that was developed by Sinclair Research released in the UK in 1982, and is the direct follower of the ZX81. The Spectrum was released as six different models, ranging from the entry level with 16 KB RAM (produced from 1982 to 1985), to the ZX Spectrum +3 with 128 KB RAM and built in floppy disk drive.
The Spectrum was among the first mainstream audience home computers in the UK, similar in significance to the Commodore 64 in the USA.
The Commodore 64, Dragon 32, Oric-1, Oric Atmos, BBC Micro and later the Amstrad CPC range were rivals to the Spectrum in the UK market during the early 1980s. However with the popularity of the Spectrum it eventually went on to become Britain’s best-selling microcomputer, selling over 5 million units worldwide

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