BBC+Micro

a series of 8-bit 6502 based [|home computers] by Acorn Computers Ltd, initially designed by a team including [|Steve Furber] and [|Sophie Wilson], first released in December 1981. The Micro was contracted by the [|British Broadcasting Corporation (BBC)] after a [|call for bids] for a computer to accompany the [|TV series] and literature for their //Computer Literacy Project// , which was won by Acorn with the Proton, a successor of the Acorn Atom - renamed the BBC Micro. Acorn also employed the machine to simulate and develop the ARM architecture which, many years later, has become hugely successful. || toc =Hardware= The BBC Micro had a 6502 processor running at full 2 MHz speed, accessing fast DRAM, alternating concurrently with the [|MC6845] [|video display controller], featuring eight display modes for text and graphics varied between 20 and 40-column text suitable for a [|TV], to 80-column text requiring an [|RGB-connected] [|video monitor]. As noted by [|Steve Furber] in a recent interview, the alternating fast 4 MHz RAM access required some address [|multiplexing] using exactly the 81LS95 [|tri-state] octal buffer from [|National Semiconductor] - for unknown reasons, 81LS95 from other vendors were not working.
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 * [[image:320px-BBC_Micro.jpg link="https://commons.wikimedia.org/wiki/File:BBC_Micro.jpeg"]] ||~ || **BBC Micro**, (BBC Microcomputer System)
 * BBC Micro ||~ ||^ ||

Multiple [|input/output] ports were available to connect with [|peripherals] or other machines, such as [|serial] [|PS-423] ports, [|parallel ports], [|analogue] input ports with [|ADC] for instance used by a [|joystick], [|light pen] input, an expansion connector (the "1 MHz bus") to expand the system with additional hardware such as the [|BBC Micro expansion], and the [|Tube interface] to connect a secondary processor. The BBC Micro had an integrated [|keyboard] and a [|cassette interface]. [|Floppy disks] were optional through the Intel [|8271] programmable [|floppy disk controller], in later models replaced by [|Western Digital's] [|FD1771]. The [|Texas Instruments] [|SN76489] was responsible for [|sound]. [|Phoneme] based [|speech synthesis] using TI's [|TMS5220] speech chip with a custom Acorn ROM of [|Kenneth Kendall's] voice was optional.  =Models= The initial BBC Micro was shipped as Model **A** with 16 KiB of user RAM, and Model **B** with 32 KiB. The [|Acorn Electron] was a budget version of the B-Model released by Acorn in 1983. Two export models were developed for the US and [|West Germany] in 1983. As a sideline, the [|Acorn Business Computer (ABC)] range of machines was announced in October 1984.

The Model **B+** in mid 1985, increased the total RAM to 64 KiB, the **B+128** came with an additional 64 KiB (4 × 16 KBi "Sideways" RAM banks) to give a total RAM of 128 KiB. The [|BBC Master] with integrated [|floppies] followed in 1986 with an enhanced [|65SC12] CPU, and expandable 128 KiB RAM as default, and remained in production until 1993. =Software= The [|Acorn Machine Operating System] (MOS) was held in 16 KiB of ROM on the [|motherboard]. A further 16 KiB ROM contained the BBC BASIC interpreter. [|Acornsoft] was the major publisher of software for the BBC Micro and Acorn Electron, who released Acornsoft Chess written by Arthur Norman and Nick Pelling. Other British companies in the fast growing software market were [|Micro Power], [|Computer Concepts, Ltd.] and [|Bug-Byte].

=Chess Programs=  =First Computer Go Tournament= The BBC Micro Go Tournament was held in [|London], on January 7 and 8, 1984, sponsored by [|Acornsoft]. All eight programs ran on BBC Micro. The Go playing program by Bronyslaw Przybla won the event.
 * Beeb Chess
 * Acornsoft Chess
 * Chess (David Thompson)
 * Colossus Chess 4.0
 * Micro Power Chess
 * White Knight

=See also=
 * Acorn Atom
 * Acorn Archimedes
 * BBC Micro Bit

=Publications=
 * John Vaux (**1983**). //Micro takes on Chess Machine//. [|Acorn User], No. 8, [|pdf]
 * Tony Harrington (**1983**). //University Challenge - Martin Bryant and White Knight//. [|Personal Computer World], [|August 1983], [|pdf] hosted by Mike Watters
 * Alex Bell (**1983**). //[|Chess for three gives the White Knight a winning gambit]//. [|The Micro User Magazine], December 1983
 * Arthur Norman, [|Gillian Cattell] (**1983**). //[|LISP on the BBC Microcomputer]//. [|Acornsoft] » LISP

=Manuals= > [|Circuit Diagram] (pdf)
 * [|John Coll], [|David Allen] (ed.) (**1984**). //BBC Microcomputer System User Guide//. [|pdf]
 * [|Acorn Computer] (**1985**). //BBC Microcomputer Service Manual//. Section 1, Models A + B, [|pdf]

=Forum Posts= > [|those good old times... in the 70-80ties] by Thorsten Czub, CCC, May 06, 2002
 * [|Okay, i know now: Colossus and BBC ACORN A: White Knight] by Frank Phillips, CCC, May 06, 2002

=External Links=

BBC Micro

 * [|BBC Micro from Wikipedia]
 * [|BBC Micro expansion unit from Wikipedia]
 * [|Tube (BBC Micro) from Wikipedia]
 * [|BBC Microcomputer Model B] by [|Terry Stewart] (Tezza)
 * [|Acorn BBC Micro Model B - Computing History]
 * [|DigiBarn Systems: BBC Microcomputer by Acorn]
 * [|Chris Turner - Acorn and the BBC Micro - Computing History]
 * [|Wouter's BBC micro software, scans, pictures, etc.]
 * [|Acorn Electron from Wikipedia]
 * [|BBC Master from Wikipedia]
 * [|ARX, Arthur and RISC OS] by [|Paul Fellows], [|RISC OS User Group Of London], October 15, 2012 » Acorn Archimedes

Software

 * [|Acorn MOS from Wikipedia]
 * [|BBC BASIC from Wikipedia] » BBC BASIC
 * [|BBC Micro Software at the Centre for Computing History]
 * [|Complete BBC Games Archive]
 * [|BBC Games Archive - The Stairway To Hell]
 * [|Acornsoft - BBC Micro/Acorn Electron Professional Games - Acorn Electron World]
 * [|BBC Games from the past - MicroPower Games]
 * [|BBC Computer Related Manuals: Games]

Chess Programs

 * [|Beeb Chess - Complete BBC Games Archive] » Beeb Chess
 * [|Chess - Complete BBC Games Archive] » Chess (David Thompson)
 * [|Chess (Micro Power) - Complete BBC Games Archive] » Micro Power Chess
 * [|Chess (V2.1) - Complete BBC Games Archive] » Acornsoft Chess
 * [|Colossus Chess 4 for BBC Micro (1986) Ad Blurbs] - [|MobyGames] » Colossus Chess

Computer Literacy Project

 * [|BBC - Computer Literacy Project - Computing History]
 * [|The Computer Programme from Wikipedia]
 * [|Making the Most of the Micro from Wikipedia]
 * [|Micro Live from Wikipedia]
 * [|David Allen and Steve Lowry - The BBC Micro and Computer Literacy Project - Computing History]

Misc
> media type="youtube" key="y4WG549i3YY" > media type="youtube" key="r9oAAcRk2Ys"
 * [|Computer Go - Past Events - Acorn 1984] » Go
 * Building the BBC Micro (The Beeb) with [|Steve Furber] - Computerphile, [|YouTube] Video
 * [|The BBC Model B Microcomputer System]: As seen in [|Tezza's classic computer collection], [|YouTube] Video

=References= =What links here?= include page="BBC Micro" component="backlinks" limit="40"
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