Acorn BBC Micro Model B+ 64K (Acorn R&D)

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This machine was used in Research and Development. It has a motherboard which is Issue A. Boards with letters are for development, ones with numbers for production.

Towards the end of the BBC Micro era, Acorn were developing an enhanced version called ‘Master’ and had hired the engineer, Paul Swindell from Racal Decca in Leicester, who was tasked with fixing the rather suspect timing in the original BBC Micro. This is his hand-built prototype with all the major chips socketed.

The BBC Microcomputer was launched in December 1981 as part of the BBC's Computer Literacy Project. The Computer Literacy Project was created by the BBC (British Broadcasting Corporation) to increase computer literacy and to encourage as wide a range of people as possible to gain hands-on experience with a microcomputer. The BBC Micro was very successful in the UK, selling over 1.5 million units, and was widely used in schools, with the large majority of schools having one.

As part of the project the BBC wanted to commission the development of a microcomputer that could accompany the TV programmes and literature. The BBC created a list of required specifications in early 1981, with companies including Acorn Computers, Sinclair Research, Tangerine Computer Systems, NewBury Laboratories and Dragon Data showing interest in the project. Acorn's bid won in March 1981 with their Proton prototype, which was being developed as the successor to the Acorn Atom. While the BBC Micro was launched in December 1981, production problems meant that deliveries of the computer were delayed.

The BBC Microcomputer, or the 'Beeb', is based on the 6502A microprocessor, which ran at 2MHz, and has 32K of ROM. The Model A shipped with 16K RAM and cost £299. The Model B shipped with 32K RAM and cost £399. The Model B featured higher-resolution graphics due to the higher RAM. Both models used the same circuit board, therefore making it possible to upgrade a Model A to a Model B. The machine's high cost was compensated for by its impressive expansion possibilities including disc drives, a second processor and network capabilities (Econet).

The BBC Micro used the BBC BASIC programming language, a version of the BASIC programming language. It was created mainly by Sophie Wilson for the BBC Micro

The BBC Micro is housed in a case which includes an internal power supply and a 64-key keyboard with 10 additional user-definable keys. On the back of the case there are ports for UHF out, video out, RGB, RS-423, cassette, analogue in and Econet.

"For me this was the machine that really got me into programming and micro electronics. The BBC Micro was developed by Acorn computers for the BBC who were embarking on an education programme for the UK called the "BBC Computer Literacy Project". The BBC made it their mission to have at least one of these machines available in every school in the UK.
 
The 'beeb' as it quickly became known as was fantastic for connecting to external equipment. It featured an anlogue 'joystick' port, a digital 'user' port, a 1Mhz bus connection, a 'tube' connection and a plethora of other connections. So many infact the the back of the machine ran out of space and they had to create a cut-away bay underneath the machine to accommodate them. But it was due to its connectivity and expandability that I really took to the beeb and started designing peripherals and software.
 
It was not a cheap machine. The BBC Model B sold for £399 on the high street in 1983 which was relatively expensive compared with other available machines like the Commodore 64 which sold for around £229. Regardless of the difference in price, because it was backed by the BBC, the beeb sold very well with over 1 million units sold."

Three years after the release of the BBC Microcomputer Model A and B, the BBC Microcomputer Model B+ was released in mid-1985. The Model B+ 64K increased the BBC Micro's memory from 32K to 64K. It was also available with 128K.

Compared to the Model B, it has:

  • a redesigned motherboard with the ROM sockets moved to the left side of the board so that they are not covered by the keyboard.
  • the CPU is changed from a 6502 to a 65C12
  • a new OS version 2.00 to support the new features. The startup messages is changed from "BBC Computer" to "Acorn OS"
  • a Western Digital 1770 disc controller, instead of the Intel 8271, which supports ADFS as well as DFS
  • a new DFS version 2.10 to support the WD1770
  • additional 32K RAM with 20K for shadow video memory and 12K workspace
  • additional 2 ROM expansion sockets
Machine was kindly donated by Andrew McKernan

Manufacturer: Acorn
Date: 1984



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This exhibit has a reference ID of CH64431. Please quote this reference ID in any communication with the Centre for Computing History.

 

Acorn BBC Micro Model B+ 64K (Acorn R&D)


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