An Acorn Electron with Plus 1 expansion unit attached

The Acorn Plus 1 added two ROM slots, an analogue interface ( supporting 2 channels ) and a Centronics parallel port.

Per a News article on Page # 9 of the October 1984 issue of Acorn User, the Acorn ' Plus 2 ' interface was due to provide Econet capability.

Acorn Plus 3, showing the connector and disc drive

Per a News article on Page # 9 of the October 1984 issue of Acorn User, the Plus 3 was originally destined to have used the Intel 8272 disk controller, ( and not 8271, which were in short supply at the time ).

The Advanced Plus 3 was very similar to the Acorn Plus 3 but packaged as an ADFS ROM cartridge for the Plus 1 with a disc drive connector at the head.

Advanced Plus 5 and Acorn 6502 2nd Processor.

In the years immediately after the 1983 ratification of the MIDI specification, MIDI features were adapted to several early computer platforms, including Apple II Plus, IIe and Macintosh, Commodore 64 and Amiga, Atari ST, Acorn Archimedes, and PC-DOS.

Acorn 32-bit family, Commodore 16 and Commodore Plus / 4 ( as a single grouping ), Nuon, SG-1000, ZX80, and the ZX81 were added in April 2012.

Mallard BASIC is a BASIC interpreter for CP / M written by Locomotive Software and supplied with the Amstrad PCW range of small business computers, the ZX Spectrum + 3 version of CP / M Plus, and the Acorn BBC Micro Z80 second Processor.

These were physically identical to those used by the Acorn Electron ' Plus 1 ' interface, but with enhanced electrical characteristics for some of the cartridge connector pins ( See " Appendix 7, The Master 128 Cartridge Interface "-" Advanced Reference Manual for the BBC Master ").

They also released licenced ports to smaller systems such as Software Projects ' Jet Set Willy ( Atari 8-bit, Commodore 16 / Plus / 4, BBC Micro and Acorn Electron ), First Star Software's Boulder Dash ( BBC, Electron ) and Spy vs. Spy ( C16 /+ 4, BBC, Electron ) and Mindscape's Indoor Sports ( C16 /+ 4, BBC, Electron ).

If Acorn had thought to include this small modification in the original Electron design it is likely the machine would have had a much greater impact as it would have nearly doubled the amount of motion possible in games and saved modes 0 – 3 ( including the only 16 colour mode ) from being nearly useless due to contended memory timings.

It could also draw lines 3 times faster than an Amiga and even handle the maths of 3D models faster than the 32-bit Acorn Archimedes.

The 6809E was used in the TRS-80 Color Computer ( CoCo ), the Acorn System 2, 3 and 4 computers ( as an optional alternative to their standard 6502 ), the Fujitsu FM-7, the Welsh-made Dragon 32 / 64 home computers, and the SWTPC, Gimix, Smoke Signal Broadcasting, etc.

The Atom was a cut-down Acorn System 3 without a disk drive but with an integral keyboard and cassette tape interface, sold in either kit or complete form.

:: 3 Acorn Podule expansion sockets

To prepare developers for the changes to the OS, Acorn released to its ' Registered Developer ' program RISC OS 3. 80, designed to load on Acorn's previous generation Risc PC and A7000 computers.

Originally there were 3 versions of Elite released: Acorn Electron Tape, BBC B Tape and BBC B Disk.

An Acorn Woodpecker group may consist of 1 – 7 male breeders that compete to mate with 1 – 3 females.

The graphics range was used to demonstrate the graphical power of the Acorn computers but only 3 titles were made available.

* Sonic Firsts ( 1998 ) ( Includes the first appearances of Sonic the Hedgehog, Princess Sally Acorn, Bunnie Rabbot, Super Sonic, and Knuckles the Echidna, taking stories from issue # 0 of the original Sonic Miniseries, and issues # 3, # 4, and # 13 of the regular series.

Econet was first introduced for use with the Acorn Atom and Acorn System 2 / 3 / 4 computers in 1981.

Currently Acorn has 24 members and 3 interns living on 75 acres ( 304, 000 m² ).

In addition, a Psion Series 3a variant with factory installed software for the Russian language was called a Psion Series 3aR, and Acorn Computers sold a rebadged version of the Psion Series 3 and 3a marketed as the Acorn Pocket Book and Acorn Pocket Book II.

Essentially a rebadged OEM version of the Series 3 with slightly different on-board software, the Acorn Pocket Book was marketed by Acorn Computers as an inexpensive computer for schoolchildren, rather than as an executive tool.

* Acorn System 2, System 3, System 4, System 5

The hardware of the BBC Micro was emulated by a single customized ULA chip designed by Acorn in conjunction with Ferranti.

Following Olivetti's 1985 cash injection into Acorn the machine was effectively sidelined.

It was ported to the Acorn Archimedes by Jonathan Naylor ( G4KLX ).

The first commercial RISC microprocessor design was released either by MIPS Computer Systems, the 32-bit R2000 ( the R1000 was not released ) or by Acorn computers, the 32-bit ARM2 in 1987.

Sibelius, originally created for RISC-based Acorn computers, was so well-regarded that, before Windows and Macintosh versions were available, composers would purchase Acorns for the sole purpose of using Sibelius.

A British computer that used the 6502 was the BBC Micro, manufactured by Acorn, Ltd.

The recurring " Acorn Antiques " skit on the UK's Victoria Wood As Seen On TV ( 1985 – 87 ) was modeled on Crossroads and other British soap operas of the 1970s.

A 256-colour version of the game was released for the Acorn RISC OS platform on floppy disk, with a CD version including voice acting released later.

It was also used in a number of products including the Acorn Computers Risc PC and Eidos Optima video editing system.

Beginning in December 1914, London worked on The Acorn Planter, A California Forest Play, to be performed as one of the annual Grove Plays, but it was never selected — it was described as too difficult to set to music.

An Acorn Archimedes port was underway in May 1994.

Acorn Computers Ltd. was a British computer company established in Cambridge, England, in 1978.

' Best Of ' DVDs were released in the UK over the years however a complete series had never been released until Series 18 was released by Acorn Media UK on February 6, 2012.

The Acorn Business Computer ( ABC ) plan required a number of second processors to be made to work with the BBC Micro platform, but processors such as the Motorola 68000 and National Semiconductor 32016 were unsuitable, and the 6502 was not powerful enough for a graphics based user interface.

A trip to the Western Design Center in Phoenix, where the 6502 was being updated by what was effectively a single-person company, showed Acorn engineers Steve Furber and Sophie Wilson that they did not need massive resources and state-of-the-art R & D facilities.

VLSI Technology, Inc was chosen as silicon partner, since it already supplied Acorn with ROMs and some custom chips.