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"Acorn Computers Ltd. was a British computer company established in Cambridge, England, in 1978. The company produced a number of computers which were especially popular in the UK, including the Acorn Electron and the Acorn Archimedes. Acorn's BBC Micro computer dominated the UK educational computer market during the 1980s. It is more known for its BBC Micro model B computer than for its other products.

Though the company was broken up into several independent operations in 1998, its legacy includes the development of reduced instruction set computing (RISC) personal computers. One of its operating systems, RISC OS, continues to be developed by RISC OS Open. Some of Acorn's former subsidiaries lived on: ARM Holdings technology is dominant in the mobile phone and personal digital assistant (PDA) microprocessor market.[2]

Acorn is sometimes referred to as the "British Apple" and has been compared to Fairchild Semiconductor for being a catalyst for start-ups. In 2010, the company was listed by David Meyer in ZDNet as number nine in a feature of top ten "Dead IT giants". Many British IT professionals gained their early experiences on Acorns, which were often more technically advanced than commercially successful US hardware." [Wikipedia]

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 Acorn Atom

 Model A
 Model B
 Model B+
 Model B+64
 Model B+128
 BBC Master
 BBC Master Compact

 Acorn Electron
 Acorn Plus 1 (Expansion)
 Acorn Plus 2 (Expansion)
 Acorn Plus 3 (Expansion)

 BBC Archimedes 305
 BBC Archimedes 310
 BBC Archimedes 310M
 Acorn Archimedes 410
 Acorn Archimedes 440
 BBC A3000
 Acorn Archimedes 410/1
 Acorn Archimedes 420/1
 Acorn Archimedes 440/1
 Acorn R140
 Acorn Archimedes 540
 Acorn R225
 Acorn R260
 Acorn Archimedes A5000
 Acorn A4
 Acorn Archimedes A3010
 Acorn Archimedes A3020
 Acorn Archimedes A4000
 Acorn Archimedes A7000

Useful links

Acorn Serial Numbers - helps you to work out which model you have