Question: What kind of group does Amstrad and BBC Micro have in common?

full_context: Document 1: Acorn Atom: The Acorn Atom is a home computer made by Acorn Computers Ltd from 1980 to 1982, when it was replaced by the BBC Micro (originally "Proton").
Document 2: Amstrad PCW: The Amstrad PCW series is a range of personal computers produced by British company Amstrad from 1985 to 1998, and also sold under licence in Europe as the "Joyce" by the German electronics company Schneider in the early years of the series' life. The PCW, short for "Personal Computer Word-processor", was targeted at the wordprocessing and home office markets. When it was launched the cost of a PCW system was under 25% of the cost of almost all IBM-compatible PC systems in the UK, and as a result the machine was very popular both in the UK and in Europe, persuading many technophobes to venture into using computers. However the last two models, introduced in the mid-1990s, were commercial failures, being squeezed out of the market by the falling prices, greater capabilities and wider range of software for IBM-compatible PCs.
Document 3: Commodore 64x: The Commodore 64x is a replica PC based on the original Commodore 64, powered by standard x86 Intel processors ranging from the Intel Atom to the Intel Core i7. It was sold by Commodore USA starting in April 2011. Because Commodore USA went out of business after the death of its founder, Barry Altman, this machine is no longer available.
Document 4: Amstrad: Amstrad is a British electronics company. s of 2006 , Amstrad's main business is manufacturing Sky UK interactive boxes.
Document 5: Amsprop: Amsprop is the property company of Alan Sugar. Amsprop now holds the majority of Sugar's £800 million wealth and owns several office building freeholds in Mayfair and other parts of London. Amsprop also owns the Sampson House building on the South Bank of the Thames, which is currently leased back to IBM.
Document 6: Apple II series: The Apple II series (trademarked with square brackets as "Apple ][" and rendered on later models as "Apple //") is a family of home computers, one of the first highly successful mass-produced text command microcomputer products, designed primarily by Steve Wozniak, manufactured by Apple Computer (now Apple Inc.) and introduced in 1977 with the original Apple II. In terms of ease of use, features and expandability, the Apple II was a major technological advancement over its predecessor, the Apple I, a limited-production bare circuit board computer for electronics hobbyists that pioneered many features that made the Apple II a commercial success. Introduced at the West Coast Computer Faire on April 16, 1977, the Apple II was among the first successful personal computers; it launched the Apple company into a successful business (and allowed several related companies to start). Throughout the years, a number of models were sold, with the most popular model remaining relatively little changed into the 1990s. While primarily an 8-bit computer, by mid-run a 16-bit model was introduced.
Document 7: Acornsoft: Acornsoft was the software arm of Acorn Computers, and a major publisher of software for the BBC Micro and Acorn Electron. As well as games, it also produced a large number of educational titles, extra computer languages and business and utility packages – these included word processor "VIEW" and the spreadsheet "ViewSheet" supplied on ROM and cartridge for the BBC Micro/Acorn Electron and included as standard in the BBC Master and Acorn Business Computer.
Document 8: Sky UK: Sky UK Limited (formerly British Sky Broadcasting and BSkyB) is a telecommunications company which serves the United Kingdom. Sky provides television and broadband internet services, fixed line and mobile telephone services to consumers and businesses in the United Kingdom. It is the UK's largest
Document 9: TRS-80: The TRS-80 Micro Computer System (TRS-80; later known as the Model I to distinguish it from successors) is a desktop microcomputer launched in 1977 and sold by Tandy Corporation through their Radio Shack stores. The name is an abbreviation of "Tandy/Radio Shack, Z-80 microprocessor". It was one of the earliest mass-produced and mass-marketed retail personal computers.
Document 10: Acorn Electron: The Acorn Electron is a budget version of the BBC Micro educational/home computer made by Acorn Computers Ltd. It has 32 kilobytes of RAM, and its ROM includes BBC BASIC v2 along with its operating system.
Document 11: Electronix corporation: Electronix Corporation distributes electronic parts and accessories for home and business use, as well as data storage devices (under the name RaidWeb) and electronic technician information services (under the name RepairWorld). In addition, Electronix operates a computer repair/IT service division under the name Electronix Computer Center. Founded in 1986, Electronix is a privately owned small business.
Document 12: Acorn Computers: 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.
Document 13: The Micro User: The Micro User (titled BBC Micro User in the first three issues) was a British specialist magazine catering to users of the BBC Microcomputer series, Acorn Electron, Acorn Archimedes and, to a limited extent, the Cambridge Z88. It had a comprehensive mix of reviews of games, application software, and the latest Acorn computers; type-in programs (duplicated on a "cover disk" which was available separately), a correspondence page offering help with computer problems, and approachable technical articles on programming and the BBC Micro's internals.
Document 14: Currys: Currys is a British electrical retailer operating in the UK and Republic of Ireland, owned by Dixons Carphone. It specialises in selling home electronics and household appliances, with 295 superstores and 73 high street stores. Smaller stores also trade under the Currys Digital brand in the UK, which was introduced to rebrand all former Dixons stores in 2006. Dixons stores in Ireland followed in August 2008, without the Digital suffix.
Document 15: BBC Micro: The BBC Microcomputer System, or BBC Micro, is a series of microcomputers and associated peripherals designed and built by the Acorn Computer company for the "BBC Computer Literacy Project", operated by the British Broadcasting Corporation. Designed with an emphasis on education, it was notable for its ruggedness, expandability, and the quality of its operating system. An accompanying 1982 television series ""The Computer Programme"" featuring Chris Serle learning to use the machine was also broadcast on BBC 2.
ground_truth: company