382:. The hardware and software design was created by Graham Toal. The initial software to use the adapter was quite basic but the BBC decided to rewrite it and produced the Advanced Teletext System in conjunction with GIS. The new ROM software added several features including support for the new Fastext system, which introduced the four coloured buttons subsequently found almost ubiquitously on European remote controls, including the "red button" which remains a feature of digital television broadcasting. A software downloader was also provided in ROM, permitting access to software available via the broadcast medium known as telesoftware. The downloader could be accessed by pressing a function key, this initiating a search for a catalogue of available software and opening a menu displaying the catalogue. Various commands were also provided to access teletext and telesoftware features.
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start of 1982 could have cost £20,000. To realise the "full potential" of the solution, a plotter was recommended, although A3-sized plotters cost at least £1,000, with a
Tektronix A2-sized model costing £6,500 but offering a precision of 0.001mm. In a review published in late 1982, the solution was regarded as "the most powerful drawing system available in Britain today for use on small computers". By 1984, Robocom was claiming to be the UK's leading supplier of CAD solutions, with 2,500 users, and the Acorn-licensed version of the Bitstik solution offered a higher screen resolution, more colours, and better performance. At launch, only Acorn's own sparkjet printer was supported as an output device, however.
143:
the second processor at £199, the cost of the BBC Micro itself at £399, and the price of a colour monitor (Acorn recommending their own RGB monitor), the total investment was estimated to be between £1500 and £2000 depending on any particular customer's existing equipment and preferences. Featuring a three-axis joystick, offering the usual two-dimensional navigation plus a knob to control zooming, the software worked in the high-resolution four-colour display mode, providing support for the display and editing of scalable vector graphics. The dual-drive arrangement was necessary to allow the first drive to provide access to the utilities and for the second drive to act as a "drawing buffer".
329:-compatible hard drives, coupled with the use of a relatively fast 8 MHz CPU. Due to the method of interfacing the second processor to the host system, the board was also able to give the 68008 direct access to the host machine's user port, 1 MHz bus and analogue port, permitting the development of programs in languages like C to utilise these capabilities. Indeed, Cumana bundled an estimated £3000 worth of software with the board, including assembly language, BASIC, Pascal and C language tools, the "fourth generation language" Sculptor, word processing, spellchecking, mail merge, spreadsheet and database applications, plus a screen editor.
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serial or parallel interface, offer up to 1 MB of RAM, up to 5 MB of hard disk storage, and either a minimal operating system or Unix. Subsequent news of the second processor indicated the renaming of the product, dropping the Gluon name, the use of Acorn's own Panos operating system instead of Xenix, with availability in 1985.
338:
processor project had been pursued internally within Acorn, leading to a tentative product that would offer better support for high-level languages, but the product was not brought to market, with Acorn choosing to emphasise the 6502, whose performance was being steadily improved relative to the 6809.
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Cumana chose to produce a 68008 second processor running the OS-9 operating system that was installed into the 6502 CPU socket, relocating the 6502 to the second processor board itself, and providing 512 kB RAM and its own disk controller. Initial pricing was announced as £695 plus VAT, although
341:
Permanent Memory
Systems produced a 6502 second processor, the B2P 6502, employing a 2 MHz 65C02 processor – as opposed to the faster 6502 device used by the Acorn 6502 Second Processor unit – together with 64 kB of RAM. Connecting to the Tube and 1 MHz
321:
subsequent recommended retail prices were around £800 for the upgrade board alone, with "particularly keenly priced" bundles of the board with 10 MB and 20 MB hard drives available for £900 and £1,000 respectively. Performance concerns associated with the 68008, due to experiences with the
251:
The
Universal Second Processor Unit was an adapter for BBC Master internal co-processor boards, to allow them to be used as external co-processors. It comprised a power supply, interface logic and a connector that matched the internal co-processor connector built into the BBC Master main board. This
199:
second processor solution was apparently planned for the BBC Micro and for other 8-bit microcomputers, with the BBC Micro version employing the Tube interface and offering a quarter of a megabyte of RAM, whereas the "Universal Gluon" would be connected to a microcomputer acting as a terminal using a
332:
Cambridge
Microprocessor Systems (CMS) and Control Universal both offered 6809 second processor solutions equipped with 64 kB of RAM and supporting the FLEX operating system. The CMS product was a single board that could be fitted inside the BBC Micro's case and connected to the Tube interface
312:
Although Acorn never released a 68000 second processor product, Acorn's co-founder, Chris Curry, speculated on the nature of a 68000-based second processor product utilising its predecessor to the BBC Micro, the Proton. Indicating the need for "quite a full Proton system" acting as a front end to a
142:
The
Bitstik CAD system, originally developed by Robocom for the Apple II, was offered as an accessory for the 6502 Second Processor, also requiring dual 80-track floppy drives. The Bitstik system itself was introduced with a price of around £375, which combined with floppy drives estimated at £500,
337:
rack, whereas
Control Universal's product consisted of two separate boards providing the CPU and memory mounted in a Eurocard rack, plus a separate interface board. Both products employed two 6522 VIA devices to interface with the Tube interface instead of using a dedicated Tube ULA. A 6809 second
150:
in 1982 at a price of £275 for the device and software itself, with a complete system costing around £2000. This was, however, considered "extremely good value", given that a "ready-to-use 'turnkey' drawing computer" would have cost £100,000 for a minicomputer-based system in 1980, and even at the
293:
Several other second processor solutions were produced by third party suppliers, typically employing a different style of casing than the standard expansion unit profile, with some using the 1 MHz bus instead of the Tube connector, and with others merely providing a conventional serial link.
203:
The product that was eventually delivered is a sophisticated second processor expansion sometimes branded as "Acorn
Cambridge Co-Processor" with an Acorn logo, and sometimes as "BBC Microcomputer System 32016 Second Processor" along with the BBC Micro's owl logo. The device uses the 32016 CPU and
182:
The product was launched in mid-1984 at a price of £299 and included an estimated £3000 worth of bundled software that included the CP/M 2.2 operating system itself (with GSX graphics), CIS Cobol and utilities from
Microfocus, the Memo Plan, Graph Plan and File Plan office applications from Chang
242:
line. Originally, Acorn had apparently sought to use CPUs rated for 10 MHz, but seemed to have settled for available parts as the different products were introduced. The second processor board was also able to use 64-kilobit or 256-kilobit RAM devices, thus allowing the earlier 256 kB
186:
Despite "a policy of continuous improvement", Acorn apparently abandoned plans to update the software bundle in mid-1986 due to a review of the CP/M market. Other suppliers continued to support the Z80, delivering Z80 second processor hardware and software bundles, such as the Task-Master which
304:
Torch also offered the Intel 8088-based
Graduate running MS-DOS and having 256 kB of RAM and dual floppy drives, priced at £1000 plus VAT, and the Z80- and 68000-based HDP68K or Unicorn, the latter running Unix and having 256 kB of RAM or more, floppy drive and 20 MB hard drive.
308:
Various other 68000-based second processor solutions were offered, such as the Casper by CA Special
Products, the Cambridge Microprocessor Systems 68000 second processor, the Flight Electronics 68000 processor board, and the Micro Developments MD512k Universal Second Processor System.
256:
with 512 kB of RAM), by fitting them into this expansion unit. It also allowed the BBC Master to have two internal co-processor boards connected, only one of which could be enabled through software. Watford Electronics sold a similar solution called the Co-Pro Adaptor.
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segments together. An Econet bridge is capable of automatically learning a simple network topology and selectively forwarding packets from one LAN segment to the other using a simple routing table based on the contents of the network byte in the Econet packet.
187:
combined an externally connected second processor, compatible with the BBC Model B, B+ and Master, and a suite of software including a CP/M 2.2-compatible operating system known as ZCPR3 and Borland's Turbo Pascal plus other development tools.
106:
processor was slightly misleading, since connected and switched on, the system worked on a "host-parasite" model, with the processor in the external unit taking control while the 6502 in the "main" computer simply took on responsibility for
178:
programs. As noted in one review, with reference to the intended appeal of the BBC Micro to the home, education and business markets, with the Z80 second processor "Acorn have completed the BBC Microcomputer system as originally planned".
139:, called Hi-BASIC, was delivered on ROM with this processor together with a DNFS ROM containing the latest versions of the disc filing system (DFS) and Econet network filing system (NFS). The product was launched with a price of £199.
342:
bus connectors, the expansion did not use Acorn's Tube ULA and thus risked incompatibility with some software written for the Acorn unit, but the benefit of this approach was the B2P's more competitive price of around £100.
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operating system. It was not branded "BBC", but it is physically contained within the family's "cheese wedge" case. The ARM 1 processor was clocked at 8 MHz, and was fitted with 2 MB or 4 MB of RAM.
385:
The adapter itself was mains powered with its own power switch matching the one on the BBC microcomputer. Connection to the computer was via a ribbon cable and the only other connector on the adapter was a female
135:, of which typically 30–44 kB was free for application data (compared to as little as 8.5 kB on an unexpanded Model B in graphics mode, or only 5.75 kB with the disc interface). A version of
313:
68000-based unit, the tentative projected cost of the Proton system was thought to be around £450, with the expansion unit costing around £1,000, offering 256 KB or 512 KB of RAM. The Unix and
231:. Initially offered as the 32016 Second Processor with 256 kB of RAM, the expansion was subsequently delivered as the Cambridge Co-Processor with 512 kB or 1 MB of RAM as standard.
102:. Only one second processor unit could be connected at a time to a BBC Micro, although a Master 128 could also have a co-processor fitted internally at the same time. The terminology of
1585:
297:
Z80 second processors offering 64 kB of RAM and CP/M-compatible operating systems included the Multiform Z80 from Technomatic, priced at £299, and several products from
183:
Laboratories, the Accountant and Nucleus packages from Compact Accounting Services, and two BASIC implementations: Z80 BBC BASIC and Mallard Professional BASIC.
1578:
394:. Once tuned, use of the adapter, including switching channels, was controlled via the computer. Teletext pages were displayed on the computer monitor.
285:
In 2006, a new ARM processor board using an ARM7TDMI processor was designed and sold, without an enclosure but able to fit within the original case.
43:
30:
442:
The Econet bridge is unique among the cheese wedge expansions, in that it is a stand-alone device that does not require a BBC computer to operate.
391:
265:
The ARM Evaluation System was announced in July 1986 for fourth quarter availability at a cost of £4,500 plus VAT. As one of the first production
1571:
325:, were alleviated through the presence of "plenty of sub processors", these utilised for managing peripherals including control of floppy and
963:"ACORN COMPUTERS ANNOUNCE THE AVAILABILITY OF AN EVALUATION SYSTEM FOR THEIR SINGLE CHIP, 32-BIT REDUCED INSTRUCTION SET COMPUTER - THE ARM"
908:
374:-like "Mode 7" display mode inside the 8-bit BBC Micros made a broadcast teletext adapter an obvious expansion, and the BBC would broadcast
351:
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allowed the BBC B and B+ to use the Turbo board (4 MHz 65C102 with 64 kB of RAM) and the Master 512 board (10 MHz
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154:
Various CAD programs were able to take advantage of the 6502 Second Processor, as was the second processor-specific version of
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390:(in) connector. The adapter contained four manual tuning wheels to receive signals from four different broadcast channels.
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131:) was clocked at 3 MHz, a full 50% faster than the 6502 inside a BBC Model B, and also had 64 kB of
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specification to be upgraded to 1 MB as the higher-density devices became available and affordable.
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Second Processor featured a Z80B CPU running at 6 MHz accessing 64 kB of RAM. It required the
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is one of a number of peripherals in a box with the same profile and styling as the main computer.
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1195:"High Speed CP/M Compatibility at Low Cost with the MD512k Universal Second Processor System"
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The 32016 processor is clocked at 6MHz, compared with 8MHz on the Cambridge Workstation.
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fitted into the "cheese wedge"-shaped case. It enabled the user to connect to Prestel
350:
The adapters connected to the BBC Micro's 1 MHz bus interface. Adapters could be
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operating systems were considered to be likely candidates to run on the expansion.
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such as the Z80 Disc Pack (ZDP) and ZEP, the latter priced at around £340.
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The second processors are connected to Acorn's proprietary and trademarked
21:
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806:
The British Broadcasting Corporation Microcomputer 32016 Second Processor
423:
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Evaluation System was part of the development programme leading to the
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internally, with the option of connecting the board externally in a
174:
upgrade and, being aimed at business, enabled the BBC system to run
146:
The original Bitstik product had been introduced for the 64 kB
158:. Hi versions of View, WordWise and Intersheet were also produced.
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407:
361:
253:
238:
using an 8 MHz CPU and 4 MB of RAM, sold as part of the
128:
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bus to specialised equipment. "Acorn" rather than "BBC" branded.
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Acorn Cambridge Co-Processor @ The Centre for Computing History
1827:
1559:
Acorn ARM Evaluation System @ The Centre for Computing History
108:
15:
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204:
32081 FPU running at 6 MHz. It runs the non-graphical
234:
The 32016 second processor is also present as part of the
988:"Sprow's webpages - Internal or external ARM coprocessor"
211:. Various programming languages are available including
1273:
Grace, Clive (January 1987). "Up, Up & Upgrade?".
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839:. Acorn Computers Limited. July 1985. p. 5.
1089:Cummins, Andrew; Voke, Peter (September 1984).
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8:
1450:"Acorn (Was Re: Reading PDP-8 paper tapes)"
1370:"Acorn (Was Re: Reading PDP-8 paper tapes)"
366:The BBC with Teletext Adaptor on the right.
1745:
1586:
1572:
1564:
509:
507:
1470:Owen, Ann (October 1988). "On The Air".
67:Teletext Adapter alongside a BBC Model B
46:of all important aspects of the article.
450:
354:, allowing more than one to be fitted.
195:Originally referred to as the Gluon, a
1889:
759:. October 1982. pp. 62–63, 69, 71
422:Allowed the BBC Micro to talk over an
42:Please consider expanding the lead to
1885:Adapters (IEEE488, Prestel, Teletext)
1343:"Graham Toal's 6809 Second Processor"
123:Interior of the 6502 Second Processor
7:
1037:"Can the ZEP 100 Zap the Acorn Z80?"
1510:Binary Dinosaurs 32016 co-processor
127:The 6502 Second Processor (using a
486:"New Dimension in Time and Space?"
14:
1395:Toal, Graham (1 September 2003).
1091:"Unicorn: Cheapest Route to Unix"
833:Cambridge Co-Processor User Guide
1248:"Cumana launch 16-bit processor"
414:services over a telephone line.
20:
1795:Doctor Who: The First Adventure
1422:Rietti, Benjamin (March 1987).
916:. Acorn Computers Limited. 1987
883:"Acorn dispels superchip doubt"
678:. June 1984. pp. 26–27, 31
533:Simpson, Richard (April 1984).
247:Universal Second Processor Unit
34:may be too short to adequately
1554:ARM Evaluation System software
1549:ARM Evaluation System pictures
1035:Williams, Simon (April 1985).
935:Taylor, Gordon (August 1987).
852:"Cambridge 32016 Co-Processor"
850:Cullis, Roger (October 1985).
617:Gibbs, Tony (September 1982).
516:For ideas that can multiply...
484:Williamson, Clive (May 1984).
227:, in addition to a version of
44:provide an accessible overview
1:
1890:Second processors (6502, Z80)
1884:
1595:BBC Computer Literacy Project
1315:Fojut, Vincent (March 1985).
1833:Cambridge Systems Technology
1650:Making the Most of the Micro
1368:Toal, Graham (1 July 2003).
968:(Press release). 7 July 1986
459:"Plug-in boards boost power"
197:National Semiconductor 32016
1761:Advanced Disc Filing System
1526:Acorn Cambridge Workstation
1201:. October 1986. p. 101
1123:. December 1986. p. 15
785:. December 1984. p. 10
619:"Apple Graphics on a Stick"
535:"Low cost step into design"
465:. February 1986. p. 11
236:Acorn Cambridge Workstation
1948:
1788:Doctor Who and the Warlord
1493:BeebMaster's Cheese Wedges
1288:Grace, Clive (July 1985).
1254:. November 1985. p. 9
1220:Kewney, Guy (April 1981).
1008:Brown, Ed (October 1986).
910:Universal Second Processor
704:. August 1986. p. 159
563:Webb, Mark (August 1984).
522:. Acorn Computers Limited.
406:adapter was essentially a
1397:"BBC Micro 6809 2nd proc"
1062:Vogler, Jon (June 1985).
812:. Acorn Computers Limited
698:"Acorn drops Z80 upgrade"
644:Pipes, Alan (June 1984).
590:Mudge, Robin (May 1984).
1323:. pp. 175, 177, 179
1149:. March 1987. p. 15
1097:. pp. 139, 141, 165
392:Rear view of the adapter
73:BBC Micro expansion unit
1878:BBC-branded peripherals
1628:TV programmes, services
1619:Archimedes range, A3000
1532:Acorn Business Computer
1226:Personal Computer World
1068:Personal Computer World
1043:. pp. 141, 143–144
730:. July 1987. p. 15
592:"CAD Within Your Grasp"
289:Other Second Processors
240:Acorn Business Computer
1643:The Computer Programme
1636:Now the Chips Are Down
1317:"6809 A Useful Number"
1175:. June 1987. p. 7
889:. July 1984. p. 7
750:"Chris Curry of Acorn"
367:
191:32016 Second Processor
124:
92:
68:
1854:Pace Micro Technology
1538:ARM Evaluation System
1010:"Improve Your Memory"
779:"Add-ons out..almost"
388:75 ohm TV aerial
365:
261:ARM Evaluation System
122:
115:6502 Second Processor
91:6502 Second Processor
90:
66:
1906:BBC Domesday Project
598:. pp. 27–29, 98
565:"Processor Progress"
434:Used to connect two
162:Z80 Second Processor
1869:Watford Electronics
1544:ARM Processor types
1016:. pp. 143, 145
937:"BBC to PC by Tube"
859:Practical Computing
757:Practical Computing
1766:Disc Filing System
1718:Ian McNaught-Davis
1602:BBC microcomputers
1515:BeebMaster's 32016
1296:. pp. 109–112
1290:"Flexible Options"
1070:. pp. 162–163
418:IEEE 488 interface
368:
125:
93:
69:
1914:
1913:
1859:Superior Software
1839:Castle Technology
1811:
1810:
1693:Christopher Curry
1474:. pp. 44–45.
1472:A&B Computing
1349:. 31 October 2007
1294:A&B Computing
1277:. pp. 12–16.
1275:A&B Computing
1222:"Acorn's growing"
1169:"BBC take Flight"
941:A&B Computing
724:"Z80 Task-Master"
672:"Business Bundle"
569:A&B Computing
492:. pp. 39, 84
83:Second Processors
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571:. pp. 42–46
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539:Bits & Bytes
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943:. pp. 9–11
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646:"Acorn Bitstik"
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1713:Lesley Judd
1708:Fred Harris
1683:David Allen
972:14 February
545:11 November
323:Sinclair QL
172:floppy disc
1921:Categories
1657:Micro Live
1434:3 December
1428:Acorn User
1321:Acorn User
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463:Acorn User
446:References
378:free over
75:, for the
1816:Companies
1771:BBC BASIC
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1688:John Coll
1407:3 October
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229:BBC BASIC
100:interface
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36:summarize
1742:Software
1454:mdfs.net
1347:mdfs.net
656:22 March
629:22 March
424:IEEE-488
412:viewdata
372:teletext
346:Adapters
335:Eurocard
1780:BBCSoft
1487:General
1327:10 June
993:2 March
404:Prestel
217:FORTRAN
1844:Cumana
1676:People
1667:Ceefax
1401:cctalk
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1232:15 May
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650:Design
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380:Ceefax
315:TRIPOS
279:Arthur
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104:second
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206:Panos
156:Elite
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