Acorn Computers, Ltd.

Type	Public (defunct)
Founded	Cambridge, England (December, 1978)
Location	Cambridge, England
Key people	Chris Curry Steve Furber Hermann Hauser Andy Hopper Sophie Wilson
Industry	Computer hardware
Products	Microcomputer System Atom BBC Micro (aka Proton) Communicator Electron BBC Master Acorn Business Computer Archimedes Risc PC Acorn Online Media Set Top Box Acorn Network Computer Phoebe
Revenue	N/A
Website	Formerly www.acorn.com

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. These included the Acorn Electron, the BBC Micro and the Acorn Archimedes. An image that was present on the Acorn FTP site. ... A public company is a company owned by the public. ... The city of Cambridge is an old English university town and the administrative centre of the county of Cambridgeshire. ... Royal motto: Dieu et mon droit (French: God and my right) Englands location within the UK Official language English de facto Capital London de facto Largest city London Area  - Total Ranked 1st UK 130,395 km² Population  - Total (2001)  - Density Ranked 1st UK 49,138,831 377/km² Ethnicity... December is the twelfth and last month of the year in the Gregorian Calendar and one of seven Gregorian months with the length of 31 days. ... 1978 was a common year starting on Sunday (the link is to a full 1978 calendar). ... The city of Cambridge is an old English university town and the administrative centre of the county of Cambridgeshire. ... Royal motto: Dieu et mon droit (French: God and my right) Englands location within the UK Official language English de facto Capital London de facto Largest city London Area  - Total Ranked 1st UK 130,395 km² Population  - Total (2001)  - Density Ranked 1st UK 49,138,831 377/km² Ethnicity... Christopher Curry was, along with Hermann Hauser and Andy Hopper, one of the co-founders of Acorn Computers Ltd. ... Stephen Byram Furber is probably best known for his work at Acorn where he was one of the designers of the BBC Micro and the ARM 32-bit RISC microprocessor. ... Hermann Maria Hauser, CBE FREng FinstP CPhys (23 October 1948 -), is an entrepreneur born in Vienna, Austria. ... Andrew Hopper (b. ... Sophie Wilson, formerly Roger Wilson, is a British computer scientist. ... Hardware comprises all of the physical parts of a computer, as distinguished from the data it contains or operates on, and the software that provides instructions for the hardware to accomplish tasks. ... The Acorn System 1, initially called the Acorn Microcomputer (Micro-Computer), was an early 8_bit microcomputer for hobbyists, based on the MOS 6502 CPU, and produced by British company Acorn Computers from 1979. ... The Atom was Acorns first computer to be aimed squarely at the home market. ... The BBC Micro, affectionately known as the Beeb, was an early home computer. ... The Acorn Communicator was never released. ... The Acorn Electron Acorn Electron BASIC - the first thing displayed when an unexpanded Electron is switched on The Acorn Electron was a budget version of the BBC Micro educational/home computer made by Acorn Computers Ltd. ... A BBC Master 128 with monitor and disk drives. ... The Acorn Business Computer 210, also known as the Cambridge Workstation. ... The Acorn Archimedes was Acorn Computers Ltds first general purpose home computer based on their own ARM RISC CPU, and spawned a family of very capable machines with various options. ... The Risc PC (codenamed Medusa) was Acorn Computers Ltds next generation RISC OS/Acorn RISC Machine computer, launched in 1994, which superseded the Acorn Archimedes. ... The Acorn Online Media Set Top Box was produced by the Online Media division of Acorn Computers Ltd for the Cambridge Cable and Online Media Video on Demand trial and launched early 1996. ... The Acorn Network Computer was a network computer designed and manufactured by Acorn Computers Ltd. ... The Phoebe PC (or RISC PC 2) was to be Acorn Computers Ltds next generation RISC PC, slated for release in late 1998. ... In business, revenue is the amount of money that a company actually receives from its activities, mostly from sales of products and/or services to customers. ... The front page of the English Wikipedia website. ... A computer is a device or machine for making calculations or controlling operations that are expressible in numerical or logical terms. ... The city of Cambridge is an old English university town and the administrative centre of the county of Cambridgeshire. ... Royal motto: Dieu et mon droit (French: God and my right) Englands location within the UK Official language English de facto Capital London de facto Largest city London Area  - Total Ranked 1st UK 130,395 km² Population  - Total (2001)  - Density Ranked 1st UK 49,138,831 377/km² Ethnicity... The Acorn Electron Acorn Electron BASIC - the first thing displayed when an unexpanded Electron is switched on The Acorn Electron was a budget version of the BBC Micro educational/home computer made by Acorn Computers Ltd. ... The BBC Micro, affectionately known as the Beeb, was an early home computer. ... The Acorn Archimedes was Acorn Computers Ltds first general purpose home computer based on their own ARM RISC CPU, and spawned a family of very capable machines with various options. ...

Acorn's BBC Micro computer dominated the UK educational computer market during the 1980s and early 1990s, drawing many comparisons with Apple in the U.S. The BBC Micro, affectionately known as the Beeb, was an early home computer. ... Apple Computer, Inc. ...

Though the company was closed down in 2000, it leaves an impressive legacy, particularly in the development of RISC personal computers. A number of Acorn's former subsidiaries, notably ARM Holdings, live on today. Reduced Instruction Set Computing (RISC), is a microprocessor CPU design philosophy that favors a smaller and simpler set of instructions that all take about the same amount of time to execute. ... The entrance to ARMs headquarters in Cherry Hinton, Cambridge ARM Holdings is a microprocessor company headquartered in England, founded in 1990 by Hermann Hauser. ...

Prehistory: Chris Curry and Sinclair Radionics

The BBC Micro, released by Acorn in 1982.

On 25 July 1961, Clive Sinclair founded Sinclair Radionics to develop and sell electronic devices such as calculators. The failure of the Black Watch wrist watch and the calculator market's move from LEDs to LCDs led to financial problems and Sinclair approached the National Enterprise Board (NEB) for help. After losing control of the company to the NEB, Sinclair encouraged Chris Curry to leave Radionics and get Science of Cambridge (SoC) up and running. In June 1978, SoC launched a microcomputer kit that Curry wanted to develop further but Sinclair could not be persuaded. During the development of the MK14, Hermann Hauser, a friend of Curry's, had been visiting SoC's offices and had grown interested in the product. Famous BBC Micro advert This is a copyrighted promotional image. ... Famous BBC Micro advert This is a copyrighted promotional image. ... The BBC Micro, affectionately known as the Beeb, was an early home computer. ... 1982 is a common year starting on Friday of the Gregorian calendar. ... Sir Clive Marles Sinclair (born July 30, 1940), is a British entrepreneur and inventor of, among other things, the worlds first pocket calculator, in 1962 and the beloved ZX Spectrum computer in 1982. ... Sinclair Radionics Ltd was founded by Clive Sinclair in Cambridge, England on 25 July 1961. ... A basic arithmetic calculator. ... Various light-emitting diodes (5 mm reds, 3 mm greens and yellows) A light-emitting diode (LED) is a semiconductor device that emits incoherent monochromatic light when electrically biased in the forward direction. ... Reflective twisted nematic liquid crystal display. ... The National Enterprise Board (NEB) was a government body set up in the United Kingdom in 1975 to implement the Wilson Labour governments objective of extending public ownership of industry. ... Christopher Curry was, along with Hermann Hauser and Andy Hopper, one of the co-founders of Acorn Computers Ltd. ... Sinclair Research Ltd was a home computer company founded by Clive Sinclair in Cambridge, England. ... Hermann Maria Hauser, CBE FREng FinstP CPhys (23 October 1948 -), is an entrepreneur born in Vienna, Austria. ...

CPU Ltd (1978–1983)

Curry and Hauser decided to pursue their joint interest in microcomputers and, on 5 December 1978, they set up Cambridge Processor Unit Ltd (CPU) as the vehicle with which to do this. CPU soon obtained a consultancy contract to develop a microprocessor-based controller for a fruit machine for Ace Coin Equipment (ACE) of Wales. The ACE project was started at office space obtained at 4a Market Hill in Cambridge. Initially, the ACE controller was SC/MP based but soon the switch to a 6502 was made. Slot machines in the Trump Taj Mahal A slot machine (American English), poker machine (Australian English), or fruit machine (British English) is a certain type of gambling machine. ... The city of Cambridge is an old English university town and the administrative centre of the county of Cambridgeshire. ... The SC/MP from National Semiconductor was an early microprocessor, becoming available in early 1974. ... The MOS Technology 6502 is an 8-bit microprocessor designed by MOS Technology in 1975. ...

The microcomputer systems

CPU had financed the development of a 6502-based microcomputer system using the income from its design-and-build consultancy. This system was launched in January 1979 as the first product of Acorn Computer Ltd, a trading name used by CPU to keep the risks of the two different lines of business separate. Acorn was chosen because the microcomputer system was to be expandable and growth-oriented... and it had the attraction of appearing before "Apple" in a telephone directory. Around this time, CPU and Andy Hopper set up Orbis Ltd to commercialise the Cambridge Ring networking system Hopper had worked on for his PhD but it was soon decided to bring him into CPU as a director because he could promote CPU's interests at the University of Cambridge Computer Laboratory. CPU purchased Orbis and Hopper's Orbis shares were exchanged for shares in CPU Ltd. CPU's role gradually changed as its Acorn brand grew and soon CPU was simply the holding company and Acorn was responsible for development work. At some point Curry had a disagreement with Sinclair and formally left Science of Cambridge but did not join the other Acorn employees at Market Hill until a little while later. Andrew Hopper (b. ... The Cambridge Ring was an experimental local area network architecture developed at the Cambridge University Computer Laboratory in the mid-late 1970s and early 1980s. ... Doctor of Philosophy (Ph. ... The William Gates Building, which currently houses the Computer Laboratory The Computer Laboratory (CL) at Cambridge is the University of Cambridges computer science department. ...

The Acorn System 1, upper board; this one shipped on 9 April 1979.

The Acorn Microcomputer, later renamed the Acorn System 1, was designed by Sophie Wilson. It was a semi-professional system aimed at engineering and laboratory users but its price was low enough, at around £80, to appeal to the more serious enthusiast as well. It was a very small machine built on two cards, one (shown right) with an LED display, keypad, and cassette interface (the circuitry to the left of the keypad), and the other with the rest of the computer (including the CPU). Almost all CPU signals were accessible via a Eurocard connector. Upper board of the Acorn Microcomputer (Acorn System 1) Camera: Canon PowerShot G1 Timestamp: 30/12/2001 11:46:15 Shutter Speed: 1/50 Aperture: 2. ... Upper board of the Acorn Microcomputer (Acorn System 1) Camera: Canon PowerShot G1 Timestamp: 30/12/2001 11:46:15 Shutter Speed: 1/50 Aperture: 2. ... The Acorn System 1, initially called the Acorn Microcomputer (Micro-Computer), was an early 8_bit microcomputer for hobbyists, based on the MOS 6502 CPU, and produced by British company Acorn Computers from 1979. ... April 9 is the 99th day of the year in the Gregorian calendar (100th in leap years). ... 1979 is a common year starting on Monday. ... The Acorn System 1, initially called the Acorn Microcomputer (Micro-Computer), was an early 8_bit microcomputer for hobbyists, based on the MOS 6502 CPU, and produced by British company Acorn Computers from 1979. ... Sophie Wilson, formerly Roger Wilson, is a British computer scientist. ... Various light-emitting diodes (5 mm reds, 3 mm greens and yellows) A light-emitting diode (LED) is a semiconductor device that emits incoherent monochromatic light when electrically biased in the forward direction. ... For the meaning of cassette in genetics, see cassette (genetics). ... This CPU uses numerous pins to connect to the motherboard. ... Eurocard is a European standard format for PCB cards, which can be plugged together into a standardized subrack. ...

The System 2 made it easier to expand the system by putting the CPU card from the System 1 in a 19" Eurocard rack that allowed a number of optional additions. The System 2 typically shipped with keyboard controller, external keyboard, a text display interface, and a cassette operating system with built-in BASIC interpreter. The System 2 was a home computer produced by Acorn Computers from 1980. ... BASIC is a family of high-level programming languages. ... An interpreter is a computer program that executes other programs. ...

The System 3 moved on by adding floppy disk support and the System 4 by including a larger case with a second drive. The System 5 was largely similar to the System 4, but included a newer 2MHz version of the 6502. The System 3 was a home computer produced by Acorn Computers from 1980. ... A floppy disk is a data storage device that is composed of a circular piece of thin, flexible (i. ... The System 4 was a home computer produced by Acorn Computers. ... The System 5 was a home computer produced by Acorn Computers. ... A megahertz (MHz) is one million (106) hertz, a measure of frequency. ... The MOS Technology 6502 is an 8-bit microprocessor designed by MOS Technology in 1975. ...

The Atom

Development of the ZX80 started at Science of Cambridge in May 1979. Learning of this probably prompted Curry to conceive the Atom project to target the consumer market. Curry and another designer, Nick Toop, worked from Curry's home in the Fens on the development of this machine. It was at this time that Acorn Computers Ltd was incorporated and Curry moved to Acorn full-time. The Sinclair ZX80 was a home computer brought to market in 1980 by Sinclair Research. ... The Atom was Acorns first computer to be aimed squarely at the home market. ... The Fens may also refer to the Back Bay Fens, park in Boston, Massachusetts. ...

It was Curry who wanted to target the consumer market – other factions within Acorn (including the engineers) were happy to be out of that market, considering a home computer to be a rather frivolous product for a company operating in the laboratory equipment market. To keep costs down and not give the doubters reason to object to the Atom, Curry asked industrial designer Allen Boothroyd to design a case that could also function as an external keyboard for the microcomputer systems. The internals of the System 3 were placed inside the keyboard, creating a quite typical setup for an inexpensive home computer of the early 80s – the relatively successful Acorn Atom. The home computer is a consumer-friendly word for the second generation of microcomputers (the technical term that was previously used), entering the market in 1977 and becoming common during the 1980s. ... Allen Boothroyd is an industrial designer. ... The Atom was Acorns first computer to be aimed squarely at the home market. ...

To facilitate software development, a proprietary local area network had been installed at Market Hill. It was decided to include this (the Econet) in the Atom and, at its launch at a computer show in March 1980, eight networked Atoms were demonstrated with functions that allowed files to be shared, screens to be remotely viewed and keyboards to be remotely slaved. Econet is an abbreviation of Economy Network. ... 1980 is a leap year starting on Tuesday. ...

The BBC Micro

With the Atom on the market, Acorn could begin to think about its replacement. There were new 16-bit processors coming onto the market – should they move in that direction? After a great deal of discussion, Hauser suggested a compromise – an improved 6502-based machine with far greater expansion capabilities: the Proton. Acorn's technical staff had not wanted to do the Atom and they now saw the Proton as their opportunity to "do it right".¹ In computer science, 16-bit is an adjective used to describe integers that are at most two bytes wide, or to describe CPU architectures based on registers, address buses, or data buses of that size. ...

One of the developments proposed for the Proton was the Tube®: a proprietary interface allowing a second processor to be added. The idea was that processing would be farmed out to the second processor leaving the host to perform I/O. In later years the Tube would play an important role in the development of Acorn's own processor.

The owl logo of the BBC Series.

In early 1980, the BBC Further Education department conceived the idea of a computer literacy programme, mostly as a follow-up to a BBC documentary, The Mighty Micro, in which Dr. Christopher Evans from the UK National Physical Laboratory predicted the coming (micro)computer revolution. It was a very influential documentary – so much so that questions were asked in parliament. As a result of these questions, the Department of Industry (DoI) became interested in the programme, as did BBC Enterprises, who saw an opportunity to sell a machine to go with the series. BBC Engineering was instructed to draw up an objective specification for a computer to accompany the series. From a photograph of a BBC micro accessory File links The following pages link to this file: Acorn Computers Ltd ... From a photograph of a BBC micro accessory File links The following pages link to this file: Acorn Computers Ltd ... Families Strigidae Tytonidae An owl is any of some 200+ species of solitary nocturnal birds of prey in the order Strigiformes. ... This article is an overview article about the Crown chartered British Broadcasting Corporation formed in 1927. ... Documentary film is a broad category of cinematic expression united by the intent to remain factual or non-fictional. ... Dr. Christopher Riche Evans (1931 - October 10, 1979) British psychologist and computer scientist. ... The National Physical Laboratory (NPL) is the national measurement standards laboratory for the United Kingdom, based at Bushy Park in Teddington, near London. ... The Parliament of the United Kingdom of Great Britain and Northern Ireland is the supreme legislative institution in the United Kingdom and British overseas territories (it alone has parliamentary sovereignty). ... The Department of Trade and Industry is a United Kingdom government department. ...

Eventually, under some pressure from the DoI to choose a British system, the BBC chose the NewBrain from Newbury Laboratories. This selection revealed the extent of the pressure brought to bear on the supposedly independent BBC's computer literacy project – Newbury was owned by the National Enterprise Board, a government agency operating in close collaboration with the DoI. The choice was also somewhat ironic given that the NewBrain started life as a Sinclair Radionics project and it was Sinclair's preference for developing it over Science of Cambridge's MK14 that led to Curry leaving SoC to found CPU with Hauser. The NEB moved the NewBrain to Newbury after Sinclair left Radionics and went to SoC. The Grundy NewBrain was a microcomputer sold in the early-1980s by Grundy Business Systems Ltd of Teddington and Cambridge, England. ...

Although the NewBrain was under heavy development by Newbury, it soon became clear that they were not going to be able to produce it – certainly not in time for the literacy programme, nor to the BBC's specification. The BBC's programmes, initially scheduled for Autumn 1981, were moved back to Spring 1982. After Curry and Sinclair found out about the BBC's plans, the BBC allowed other manufacturers to submit their proposals. The BBC visited Acorn and were given a demonstration of the Proton. Shortly afterwards, the literacy programme computer contract was awarded to Acorn and the Proton was launched early in 1982 as the BBC Micro. The BBC Micro, affectionately known as the Beeb, was an early home computer. ...

Acorn received the Queen's Award for the BBC Micro.

In April 1984 Acorn won the Queen's Award for Technology for the BBC Micro. The award paid special tribute to the BBC Micro's advanced design and it commended Acorn "for the development of a microcomputer system with many innovative features". Queens Award for Technology image used on Acorn advertisements This is a copyrighted promotional image. ... Queens Award for Technology image used on Acorn advertisements This is a copyrighted promotional image. ...

The Electron

In April 1982 Sinclair launched the Spectrum. Curry conceived of the Electron as Acorn's sub-200 pound competitor. In many ways a cut-down BBC Micro, it used one Acorn-designed ULA to reproduce most of the functionality. But problems in producing the ULAs led to short supply and the Electron, although launched in August 1983, was not on the market in sufficient numbers to capitalise on the 1983 Christmas sales period. Acorn resolved to avoid this problem in 1984 and negotiated new production contracts. The Sinclair ZX Spectrum was a small home computer released in the United Kingdom in 1982 by Sinclair Research. ... The Acorn Electron Acorn Electron BASIC - the first thing displayed when an unexpanded Electron is switched on The Acorn Electron was a budget version of the BBC Micro educational/home computer made by Acorn Computers Ltd. ... The pound sterling, which strictly speaking refers to basic currency unit of sterling, now the pound, can generally refer to the currency of the United Kingdom (UK). ... A Gate array or Uncommitted Logic Array (ULA) is an approach to the design and manufacture of application_specific integrated circuits (ASICS). ...

Acorn Computer Group plc (1983–1985)

The BBC Micro sold spectacularly well - so much so that Acorn's profits rose from a mere £3000 in 1979 to £8.6m in July 1983. In September 1983, CPU shares were liquidated and Acorn was floated on the Unlisted Securities Market as Acorn Computer Group plc, with Acorn Computers Ltd as the microcomputer division. With a minimum tender price of 120p, the group came into existence with a market capitalisation of about £135 million. CPU founders Herman Hauser and Chris Curry leapt instantly into the paper millionaire bracket: Hauser's 53.25 million shares made him worth £64m; Curry's 43 million shares translated into £51m. The Unlisted Securities Market (USM), which ran from 1980 to 1996, was a stock exchange set up by the London Stock Exchange. ...

A new RISC architecture

Even from the time of the Atom Acorn were considering how to move on from the 6502 - for example, the 16-bit Acorn Communicator developed in 1982 using the 65816. The MOS Technology 6502 is an 8-bit microprocessor designed by MOS Technology in 1975. ... In computer science, 16-bit is an adjective used to describe integers that are at most two bytes wide, or to describe CPU architectures based on registers, address buses, or data buses of that size. ... The Acorn Communicator was never released. ... The 65816 Microprocessor (also: 65C816), a 16_bit CPU developed by the Western Design Center (WDC), is an expanded and compatible successor to the venerable MOS Technology 6502. ...

The IBM PC was launched on August 12 1981. Although a version of that machine was aimed at the enthusiast market much like the BBC Micro, its real area of success was business. The successor to the PC, the XT (EXtended Technology) was introduced in early 1983. The success of these machines, and the variety of Z80-based CP/M machines, in the business sector (and that sector's ability to cope with premium prices) demonstrated that it was a viable market - the development of a business machine looked like a good idea to Acorn. A development programme was started to create a business computer using Acorn's existing technology - the BBC Micro mainboard, the Tube and second processors to give CP/M, MS-DOS and Unix (Xenix) workstations. IBM PC (IBM 5150) with keyboard and green screen monochrome monitor (IBM 5151), running MS-DOS 5. ... The Zilog Z80 is an 8-bit microprocessor designed and manufactured by Zilog from 1976 onwards. ... CP/M is an operating system created for Intel 8080/85 and Zilog Z80 based microcomputers by Gary Kildall of Digital Research, Inc. ... CP/M is an operating system created for Intel 8080/85 and Zilog Z80 based microcomputers by Gary Kildall of Digital Research, Inc. ... Microsofts disk operating system, MS-DOS, was Microsofts implementation of DOS, which was the first popular operating system for the IBM PC, and until recently, was widely used on the PC compatible platform. ... Unix or UNIX is a computer operating system originally developed in the 1960s and 1970s by a group of AT&T Bell Labs employees including Ken Thompson, Dennis Ritchie, and Douglas McIlroy. ... Xenix was a Unix-like computer operating system derived from the UNIX system developed by Microsoft in the 1980s. ...

This Acorn Business Computer (ABC) plan required a number of second processors to be made to work with the BBC Micro platform. In developing these, Acorn had to implement the Tube protocols on each processor chosen - in the process finding out (during 1983) that there were no obvious candidates to replace the 6502; for example, because of many-cycle uninterruptible instructions, the interrupt response times of the 68000 were too slow to handle the communication protocol that the host 6502-based BBC Micro coped with easily. Development of the National Semiconductor 32016-based model of the ABC range (later sold as the Cambridge Workstation) had shown Sophie Wilson and Steve Furber the value of memory bandwidth. It also showed that an 8MHz 32016 was completely trounced in performance terms by a 4MHz 6502. Furthermore, the Apple Lisa had shown the Acorn engineers that they needed to develop a windowing system - and this was not going to be easy with a 2-4MHz 6502-based system doing the graphics! Acorn would need a new architecture. The Acorn Business Computer 210, also known as the Cambridge Workstation. ... In computer science, an interrupt is a signal from a device which typically results in a context switch: that is, the processor sets aside what its doing and does something else. ... The Motorola 68000 is a CISC microprocessor, the first member of a successful family of microprocessors from Motorola, which were all mostly software compatible. ... Stephen Byram Furber is probably best known for his work at Acorn where he was one of the designers of the BBC Micro and the ARM 32-bit RISC microprocessor. ... Apple Lisa The Apple Lisa was a revolutionary personal computer designed at Apple Computer during the early 1980s. ...

Acorn had tested all of the available processors and found them wanting. Having ruled out existing CPUs, it was clear to the developers that that Acorn should seriously consider designing its own processor.

Acorn’s engineers came across papers on the Berkeley RISC project. They could now handle the truth - if a class of graduate students could create a competitive 32-bit processor, Acorn would have no problem! A trip to the Western Design Center in Phoenix showed Furber and Wilson that they didn't need massive resources and state-of-the-art R&D facilities. Reduced Instruction Set Computing (RISC), is a microprocessor CPU design philosophy that favors a smaller and simpler set of instructions that all take about the same amount of time to execute. ... If you were looking for the Western Digital Corporation, see Western Digital. ...

Sophie Wilson set about developing the instruction set, writing a simulation of the processor in BBC Basic that ran on a BBC Micro with a 6502 second processor. It convinced the Acorn engineers that they were on the right track... but before they could go any further they would need more resources. It was time for Wilson to approach Hauser and explain what was afoot. Once the go-ahead had been given, a small team was put together to implement Wilson's model in hardware. BBC BASIC was developed in 1981 as a native programming language for the MOS Technology 6502 based Acorn BBC Micro home/personal computer, mainly by Roger Wilson. ...

The official Acorn RISC Machine project started in October 1983. VLSI Technology, Inc were chosen as silicon partner since they already supplied Acorn with ROMs and some custom chips. VLSI produced the first ARM silicon on 26 April 1985 – it worked first time and came to be known as ARM1. Its first practical application was as a second processor to the BBC Micro, where it was used to develop the simulation software to finish work on the support chips (VIDC, IOC, MEMC) and to speed up the operation of the CAD software used in developing ARM2. Wilson subsequently coded BBC Basic in ARM assembly language and the in-depth knowledge obtained from designing the instruction set allowed the code to be very dense (a typical Wilson trait), making ARM BBC Basic an extremely good test for any ARM emulator. VLSI Technology, Inc (Nasdaq: VLSI) was an American company that designed and manufactured custom chips. ...

Such was the secrecy surrounding the ARM CPU project that when Olivetti were negotiating to take a controlling share of Acorn in 1985 they were not told about the development team until after the negotiations had been finalised. Olivetti is an Italian manufacturer of computers, printers and other business machines. ... 1985 is a common year starting on Tuesday of the Gregorian calendar. ...

In 1992 Acorn once more won the Queen's Award for Technology for the ARM.

Financial problems

1984 was Acorn's watershed year – it had gone public just as the home computer market collapsed. It was the year when Atari was sold, Apple nearly went bust, and Acorn had solved the one problem it had had throughout its history: production volumes. For the concept Atari (当たり) in the board game of Go, see Atari (go term). ... Apple Computer, Inc. ...

The Electron had been launched in 1983 but problems with the supply of its ULAs meant that Acorn was not able to capitalise on the 1983 Christmas selling period – a successful advertising campaign, including TV advertisements, had led to 300,000 orders but the Malaysian suppliers were only able to supply 30,000 machines. The apparently strong demand for Electrons proved to be illusory: rather than wait, parents bought Commodore 64s or Sinclair Spectrums for their children's presents. Ferranti solved the production problem and in 1984 production reached its anticipated volumes, but the contracts Acorn had negotiated with its suppliers were not flexible enough to allow volumes to be reduced quickly in this (unanticipated) situation – supplies of the Electron built up. Acorn was in real trouble: by the end of the year it had 250,000 unsold Electrons on its hands, which had all been paid for and needed to be stored – at additional expense. A Gate array or Uncommitted Logic Array (ULA) is an approach to the design and manufacture of application_specific integrated circuits (ASICS). ... The Commodore 64 (C64, CBM 64) was a popular home computer of the 1980s. ... The Sinclair ZX Spectrum was a small home computer released in the United Kingdom in 1982 by Sinclair Research. ... Ferranti or Ferranti International Signal plc by the time of its collapse, was a major UK electrical engineering and equipment firm, known primarily for their defense electronics and power grid systems. ...

Acorn was also spending a large portion of its reserves on development: the BBC Master was being developed; the ARM project was underway; the Acorn Business Computer entailed a lot of development work but ultimately proved to be something of a flop, with only the 32016-based version ever being sold (as the Cambridge Workstation); and obtaining Federal approval for the BBC Micro in order to expand into the United States proved to a drawn-out and expensive process that proved futile - all of the expansion devices that were intended to be sold with the BBC Micro had to be tested and radiation emissions had to be reduced. Around $20m was sunk into the US operation but the NTSC modified BBC Micros sold barely at all, although they did get an appearance at Supergirl's school! Supergirl is also a 1966 hit by British singer Graham Bonney. ...

Acorn Group as an Olivetti subsidiary (1985–1998)

The dire financial situation was brought to a head in February 1985, when one of Acorn's creditors issued a winding up petition. After a short period of negotiations, Curry and Hauser signed an agreement with Olivetti on 20 February. The Italian computer company took a 49.3% stake in Acorn for £12 million, which went some way to covering Acorn's £11 million losses in the previous six months. This valuation fell some £165m below Acorn's peak valuation of £190m. In September 1985, Olivetti took a controlling share of Acorn with 79% of shares. Olivetti is an Italian manufacturer of computers, printers and other business machines. ...

BBC Master

The BBC Master was launched in February 1986 and met with great success. From 1986 to 1989, about 200,000 systems were sold, mainly to UK schools and universities. A number of enhanced versions were launched - for example, the Master 512, which had 512 KB of RAM and an internal 80186 processor for MS-DOS compatibility, and the Master Turbo, which had a 65C02 second processor. A BBC Master 128 with monitor and disk drives. ... An Intel 80186 Microprocessor The 80186 is a microprocessor that was developed by Intel circa 1982. ... Microsofts disk operating system, MS-DOS, was Microsofts implementation of DOS, which was the first popular operating system for the IBM PC, and until recently, was widely used on the PC compatible platform. ...

Archimedes and Risc PC

The first commercial use of the ARM architecture was in the ARM Development System, a Tube-linked second processor for the BBC Master which allowed one to write programs for the new system. It sold for around £4,000, and included the ARM processor and three support chips, 4MB of RAM and a set of development tools with an enhanced version of BBC BASIC. ARMs headquarters in Cambridge The ARM architecture (originally the Acorn RISC Machine) is a 32-bit RISC processor architecture that is widely used in a number of applications. ... This article needs to be cleaned up to conform to a higher standard of quality. ... This article is about a unit of data measurement. ...

The second ARM-based product was the Acorn Archimedes desktop-computer, released in mid-1987. The Archimedes was popular in the United Kingdom, Australasia and Ireland, and was considerably more powerful and advanced than most offerings of the day, but the market was already stratifying into the PC dominated world. Acorn continued to produce updated models of the Archimedes including a laptop (the A4) and in 1994 launched the Risc PC where the top specification included a 200MHz+ StrongARM processor. These were sold mainly into education, specialist and enthusiast markets. The Acorn Archimedes was Acorn Computers Ltds first general purpose home computer based on their own ARM RISC CPU, and spawned a family of very capable machines with various options. ... 1987 is a common year starting on Thursday of the Gregorian calendar. ... Australasia is the area that includes Australia, New Zealand, New Guinea, and the many smaller islands in the vicinity, most of which are the eastern part of Indonesia. ... One of the first PCs from IBM - the IBM PC model 5150. ... The Risc PC (codenamed Medusa) was Acorn Computers Ltds next generation RISC OS/Acorn RISC Machine computer, launched in 1994, which superseded the Acorn Archimedes. ... Strongarm Using the arm strength instead of a more tactful method. ...

ARM Ltd

Acorn's silicon partner, VLSI, had been tasked with finding new applications for the ARM CPU and support chips. Hauser's Active Book company had been developing a handheld device and for this the ARM CPU developers had created a static version of their processor, the ARM2aS. VLSI Technology, Inc (Nasdaq: VLSI) was an American company that designed and manufactured custom chips. ...

Apple was developing an entirely new computing platform, the Newton. Various requirements had been set for the processor in terms of power consumption, cost and performance and there was also a need for fully static operation in which the clock could be stopped at any time. Only the Acorn RISC Machine came close to meeting all these demands, but there were still deficiencies - the ARM did not, for example, have an integral memory management unit (this function being provided by the MEMC support chip) and Acorn did not have the resources to develop one. Apple Computer, Inc. ... The Newton was an early personal digital assistant (PDA) developed by Apple Computer and sold from 1993 to 1999. ...

Apple and Acorn began to collaborate on developing the ARM, and it was decided that this would be best achieved by a separate company. The bulk of the Advanced Research and Development section of Acorn that had developed the ARM CPU formed the basis of ARM Ltd when that company was spun off in November 1990. Acorn Group and Apple Computer Inc each had a 43% shareholding in ARM, while VLSI were an investor and first ARM licensee. The entrance to ARMs headquarters in Cherry Hinton, Cambridge ARM (Advanced RISC Machines) Ltd is a microprocessor design company headquartered in England, founded in 1990 by Hermann Hauser. ...

Set-Top boxes

Acorn Online Media was founded in 1994 to exploit the projected Video-On-Demand (VOD) boom. Video on demand systems are systems which allow users to select and watch video content over a network as part of an interactive television system. ...

In September 1994 the Cambridge Trial of video-on-demand services was set up by Acorn Online Media, Anglia Television, Cambridge Cable and Advanced Telecommunication Modules Ltd (ATML) – the trial involved creating a wide area ATM network linking TV-company to subscribers' homes and delivering services such as home shopping, online education, software downloaded on-demand and the World Wide Web. The wide area network used a combination of fibre and coaxial cable and the switches were housed in the roadside cabinets of Cambridge Cable's existing network. Olivetti Research Laboratory developed the technology used by the trial. An ICL video server provided the service via ATM switches manufactured by ATML, another company set up by Hauser and Hopper. The trial commenced at a speed of 2 Mbit/s to the home, subsequently increased to 25 Mbit/s. Anglia Television is the ITV station for East Anglia. ... Advanced Telecommunication Modules Ltd (ATML) was set up in 1993 by Dr Hermann Hauser and Professor Andy Hopper as a spin-off from the Olivetti Research Laboratory in Cambridge. ... Graphic representation of the World Wide Web around Wikipedia The World Wide Web (WWW, W3, or simply Web) is an information space in which the items of interest, referred to as resources, are identified by global identifiers called Uniform Resource Locators (URLs). ... The Olivetti Research Laboratory (ORL) was founded in 1986 by Hermann Hauser and Andy Hopper. ... The initialism ICL may have at least four meanings: Imperial College London, although this initialism is strongly discouraged by Imperial International Computers Ltd, the British computer hardware and services company, formerly International Computers and Tabulators Company (ICT) and others that merged with them the International Communist League Icon Library, a...

Subscribers used Acorn Online Media set-top boxes. For the first six months the trial involved 10 VOD terminals; the second phase was expanded to cover 100 homes and 8 schools with a further 150 terminals in test labs. A number of other organisations gradually joined in, including NatWest Bank, the BBC, the Post Office, Tesco and the local education authority. The Acorn Online Media Set Top Box was produced by the Online Media division of Acorn Computers Ltd for the Cambridge Cable and Online Media Video on Demand trial and launched early 1996. ... Old NatWest logo NatWest (formerly the National Westminster Bank) is the United Kingdoms third biggest bank. ... The Post Office in Oxford. ... Tesco PLC is a United Kingdom-based international supermarket chain. ... A Local Education Authority (LEA) is the part of a council in England or Wales that is responsible for education within that councils juristriction. ...

BBC Education tested delivery of radio-on-demand programmes to primary schools and a new educational service, Education Online, was established to deliver material such Open University television programmes and educational software. Netherhall secondary school was provided with an inexpensive video server and operated as a provider of Trial services, with Anglia Polytechnic University taking up a similar role some time later. Open University Logo © Open University The Open University (OU) is a distance learning university which has students all over the UK and accepted its first students in 1971. ...

It was hoped that Online Media could be floated as a separate company, but the video-on-demand boom never really boomed.

Network Computers

When the BBC's The Money Programme screened an interview with Larry Ellison in October 1995, Acorn Online Media Managing Director Malcolm Bird realised that Ellison's network computer was, basically, an Acorn set-top-box. After initial discussions between Oracle and Olivetti, Hauser and Acorn a few weeks later, Bird was dispatched to San Francisco with Acorn's latest Set Top Box. Oracle had already talked seriously with computer manufacturers including Sun and Apple about the contract for putting together the NC blueprint machine; there were also rumours in the industry that said Oracle itself was working on the reference design. After Bird's visit to Oracle, Ellison visited Acorn and a deal was reached: Acorn would define the NC Reference Standard. Larry Ellison Oracle Logo Lawrence Joseph Ellison (born August 17 , 1944) is the co-founder and CEO of the major database software firm Oracle Corporation. ... A network computer is a lightweight computer system that operates exclusively via a network connection. ... ORACLE LIKES THE COCK For alternate usages of Oracle, see Oracle (disambiguation) An Oracle is a person or agency considered to be a source of wise counsel or prophetic opinion; an infallible authority, usually spiritual in nature. ... Sun Microsystems is a computer, semiconductor and software manufacturer headquartered in Santa Clara, California, in Silicon Valley. ...

Ellison was expecting to announce the NC in February 1996. Sophie Wilson was put in charge of the NC project and by mid-November a draft NC specification was ready. By January 1996 the formal details of the contract between Acorn and Oracle had been worked out and the PCB was designed and ready to be put into production. In February 1996 Acorn Network Computing was founded. In August 1996 it launched the Acorn Network Computer. The Acorn Network Computer was a network computer designed and manufactured by Acorn Computers Ltd. ...

It was hoped that the Network Computer would create a significant new sector in which Acorn Network Computing would be a major player, either selling its own products or earning money from licence fees paid by other manufacturers for the right to produce their own NCs.

Having incorporated its STB and NC business areas as separate companies, Acorn re-organised its PC manufacturing into a further wholly-owned subsidiary, Acorn RISC Technologies (ART). One of ART's major projects was the creation of a new 'consumer device' operating system, Galileo. Galileo's main feauture was a guarantee of a certain quality of service to each process in which the resources (CPU, memory, etc.) required to ensure reliable operation would be kept available regardless of the behaviour of other processes. In the fields of packet-switched networks and computer networking, the traffic engineering term Quality of Service (QoS) refers to the probability of the telecommunication network meeting a given traffic contract, or in many cases is used informally to refer the probability of a packet succeeding in passing between two...

The last acorns fall (1998–2000)

Acorn's last real hopes of becoming a major player in the computer industry had fizzled out: set-top boxes were not taking off as expected, and the Network Computer, too, had been a bit of a flop – traditional PCs were reaching the types of prices thought to justify such a design, and increases in bandwidth to the home were slow to come about, making a web connection something of a luxury for the late 90s. Between 1996 and 1998 Olivetti disposed of its interest in Acorn Group through a series of structured transactions, raising £54m. Acorn re-structured its operations, bringing its subsidiary companies back together as divisions within Acorn. Acorn Risc Technologies became the Workstation Division, which was closed in late 1998 when Acorn finally stopped producing desktop-computers in favour of set-top boxes. The last machine (codenamed "Phoebe" or Risc PC 2) was nearly fully developed at the time of the project's abandonment, and therefore was never produced in volume nor sold to the public (notably, numbers of its distinctive yellow case were produced and sold off cheaply). The Phoebe PC (or RISC PC 2) was to be Acorn Computers Ltds next generation RISC PC, slated for release in late 1998. ...

ARM, however, had gone from strength to strength. In 1998, the Company underwent an initial public offering (IPO) and re-registered as a public company under the name ARM Holdings plc when it completed its IPO and listed its shares for trading on the London Stock Exchange and for quotation on the Nasdaq National Market. Morgan Stanley Dean Witter acted as global co-ordinator and bookrunner for the Offering as well as sponsor and broker for the listing on the London exchange. In financial markets, an initial public offering (IPO) is the first sale of a companys common shares to public investors. ... [edit intro] Morgan Stanley (NYSE: MWD) is an investment bank and retail broker based in New York. ...

In January 1999, Acorn Group changed the name of Acorn Computers Ltd to Element 14 Ltd as it recast itself in the image of ARM – that is as a developer of intellectual property (IP), in this case in the digital signal processing (DSP) market. In law, particularly in common law jurisdictions, intellectual property or IP refers to a legal entitlement which sometimes attaches to the expressed form of an idea, or to some other intangible subject matter. ... Digital signal processing (DSP) is the study of signals in a digital representation and the processing methods of these signals. ...

By 1999 ARM's share value had increased to a point where the capital value of Acorn Group plc was worth less than the value of its 24% holding in ARM. This situation led shareholders to press Acorn to sell its stake in ARM to provide a return on their investment. The situation also led ARM to consider taking action itself since a financially weak shareholder such as Acorn was putting ARM in a vulnerable position.

Acorn Computers Group plc was purchased on 1 June 1999 by Morgan Stanley Dean Witter Investments Limited. The transaction involved the de-listing of Acorn Group plc, as a result of which its shareholding in ARM was distributed to Acorn's shareholders.

MSDW sold the set-top box division to Pace for £200,000, and Pace thereby acquired control of RISC OS. On 26 July 1999, an Acorn management team led by Stan Boland bought the DSP business, Element 14, from MSDW for £1.5 million – its net asset value. Pace Micro Technology is a British manufacture of set top boxes for digital and analogue satellite television, founded in 1982. ... RISC OS (Reduced Instruction Set Computing Operating System) is a British GUI operating system for ARM-processor based computers or similar devices. ...

Element 14 subsequently secured £8.25 ($13) million in first round funding from Bessemer Venture Partners, Atlas Ventures and Hauser's Amadeus Capital Partners. It had its headquarters in Cambridge and an engineering facility in Bristol, UK. It headhunted Alcatel's top digital subscriber line (DSL) engineers (including designers of analogue front-end and digital ICs, xDSL modem software and specialists in asymmetric DSL (ADSL) and very high rate DSL (VDSL) systems) and thereby acquired an engineering centre in Mechelen, Belgium. Alcatel SA (NYSE: ALA) is a global company, headquartered in France that provides hardware, software and services to telecommunications service providers and enterprises. ... DSL Modem Digital Subscriber Line, or DSL, is a family of technologies that provide a digital connection over the copper wires of the local telephone network. ... Asymmetric Digital Subscriber Line (ADSL) is a form of DSL, a data communications technology that enables faster data transmission over copper telephone lines than a conventional modem can provide. ... VDSL (very high bit-rate DSL (DSL) is an xDSL technology providing data transmission up to a theoretical limit of 52 Mbit/s downstream and 12 Mbit/s upstream over a single twisted pair of wires. ... Mechelen Cathedral Mechelen (English traditionally Mechlin, French Malines, German Mecheln) is a municipality located in Belgium, Flemish region, province of Antwerp. ...

Element 14 continued to develop its DSP products until it was purchased by Broadcom in November 2000 for £366 ($594) million. Broadcom Corporation (NASDAQ: BRCM) is a supplier of integrated circuits for broadband communications. ...

RISC OS

The operating system developed for Phoebe (RISC OS 4, codename Ursula) was made available to Risc PC users by RISCOS Ltd, which licensed the operating system, and continues to develop, support and sell RISC OS today. In computing, an operating system (OS) is the system software responsible for the direct control and management of hardware and basic system operations. ... RISCOS Ltd was a UK limited company created in 1999 to continue user-focused development of the RISC OS operating system after the collapse of Acorn. ...

However, the market is still competitive with two strands of the OS currently being developed, the 26-bit RISC OS 4 which is currently sold for the Microdigital Omega, and the 32-bit RISC OS 5 for the Castle Iyonix. This competition recently caused a crisis in the community, one that threatened the platform's existence. 32-bit is a term applied to processors, and computer architectures which manipulate the address and data in 32-bit chunks. ...

See also

• ARM Holdings

The entrance to ARMs headquarters in Cherry Hinton, Cambridge ARM Holdings is a microprocessor company headquartered in England, founded in 1990 by Hermann Hauser. ...

Footnotes

1. "do it right" - quotation from an email from Sophie Wilson.

References

• Personal Computer World review of the BBC Micro (including details of BBC contract), December 1981 Personal Computer World
• "ARM's Way" (LISA influence, Berkeley RISC, Fabrication date), April 1988, Electronics Weekly
• "The history of the ARM CPU", taken from 'The ARM RISC Chip: A Programmers' Guide' by Carol Atack and Alex van Someren, published 1993 by Addison-Wesley.
• "From Atom to ARC - The ups and downs of the development of Acorn", from October, November and December 1988 editions of Acorn User.
• "ARM’s Race to Embedded World Domination" (Motorola 68000 was considered as a replacement to 6502), Paul DeMone, 2000
• "Sophie Wilson's most admired CPU" (32016 chip as example of "how to completely make a mess of things), Sophie Wilson
• Flotation of Acorn on Unlisted Securities Market, Electronics Times, 6 October 1983

External links

• The Acorn Atom pre-history
• RISC OS and Acorn pages
• Atom Review documentation of the Atom and lots of extensions made by Dutch Atom clubs
• About Acorn computers and ARM processors
• Computer History Museum - Museum of home computing and gaming.