| Machine | Memory | Filing Systems | Processor | RAM speed | OS size | OS speed MIPS |
| System 1 | 1k | Cassette | 6502 | 1 MHz | 512 bytes | 0.2 |
| System 2, 3, 4 | 32k | Disc | Varies | 1 MHz | 0.2 | |
| System 5 | 32k | Disc | 6502 | 2 MHz | 0.4 | |
| Atom | 2k | Cassette | 6502 | 2 MHz | 8k | 0.4 |
| Proton | 16k | Cassette | 6502 | 4 MHz | 16k | 0.4 |
| BBC Model A | 16k | Cassette | 6502 | 4 MHz | 16k | 0.4 |
| BBC Model B | 32k | Cassette | 6502 | 2 MHz | 16k | 0.4 |
| BBC Model B+ | 64k | DDFS | 6502 | 4 MHz | 16k | 0.4 |
| Reuters Board | 64k | 6502 | 4 MHz | 16k | 0.4 | |
| Acorn Business Computer PA | 64k | DFS | 6502 | 4 MHz | 32k | 0.4 |
| Acorn Business Computer Terminal | 64k | DFS | 6502 | 4 MHz | 32k | 0.4 |
| Acorn Business Computer 100 | 64k | DFS | Z80 | - | 32k | 0.4 |
| Acorn Business Computer 110 | 64k | DFS 10 meg HD | Z80 | - | 32k | 0.4 |
| Acorn Business Computer 200 | 512k | DFS | 32016 | 10 MHz | 32k | 0.4 |
| Acorn Business Computer 210 | 4096k | DFS 10 meg HD | 32016 | 6 MHz | 32k | 0.4 |
| Acorn Business Computer 300 | 1024k | DFS | 80286 | - | 32k | 0.4 |
| Acorn Business Computer 310 | 1024k | DFS 10 meg HD | 80286 | - | 32k | 0.4 |
| Electron | 32k | Cassette | 6502 | 2 MHz | 16k | 0.2 |
| British Telecom M2105 | 32y | Cassette | 6502 | 2 MHz | 16k | 0.2 |
| Communicator | 512k | NFS | 65816 | 2 MHz | 256k | - |
| Briefcase Communicator | 512k | NFS | 65816 | 2 MHz | 256k | - |
| Master (Master & Compact) | 128k | DFS ADFS Cassette | 65C02 | 4 MHz | 16k + | 0.4 |
| Master 512 | 512k | DOS | 80186 | 10 MHz | DOS | 0.8 |
| Master ET | 128k | NFS | 65C02 | 2 MHz | ||
| Master Scientific | 512k | 32016 | 4 MHz | |||
| Master Turbo | + 64k | 65C02 | 4 MHz | 0.8 | ||
| M19 | 256k | DOS | 8088 | - |
Powered
by a 6502 CPU it had 1024 bytes of static RAM memory and a 512 byte monitor
program. Two eurocards, one for the CPU and the other a kepad and display.
It was a DIY kit. A
very good site by Mike Cowlishaw describing the System 1
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Thanks to Brian (ebay ID brian_metrov) for these photos and information: This is a complete Flex 9 DOS based computer using on the Motorola 6809. It uses components from Acorns System 4 range. The main frame houses:- Acorn 80x25 memory mapped VDU card with front panel video out connector for driving a TV video monitor (through a scart lead). Uses memory &F000-F7FF. Three Acorn Static RAM boards, these use 2114 chips to provide 8k x 8 bit Static ram per card, with two cards having additionally 2 x 8k chips to provide a further 32k. This makes a total of 56k of ram The Acorn 6809 CPU card, with 2k BIOS EPROM. Front panel connector to a 6522 VIA for parallel keyboard input. Also, parallel printer port output on a 15 pin D type. There is also a system reset button. A custom serial port providing RS232 data to drive a VT100 terminal ( this can directly drive a PC comms port through a null modem cable (supplied) using Hyperterminal. The Acorn Disk drive interface Tandon 40 track SS SD floppy disk drive, 390k byte capacity! There is also an uncased Tandon disk drive which is connected as the second drive Included are boot disks with the Flex 9 operating system, Text processor, Line editor, Extended basic and 6809 Assembler; a complete set of manuals for all software, plus additional disks with utilities and software patches etc. This is a programmers computer and there is full information about all the components including circuit diagrams for all items. In fact there is a vast amout of information in three files. Also included is a windrush Eprom programmer which has been used with this system. Even though this system has been in store for 15 years, it boots up and runs the programmes just as it always did. |
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Acorn 6809 computer frame and uncased Tandon 40 track disk drive |
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Acorn 6809 computer rear view of frame showing |
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A collection of items related to the 6809 |
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Acorn 8k memory card modified with additional two HM6264 chips providing a further 16k memory.jpg |
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Acorn 8k memory card modified with additional two HM6264 chips |
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Acorn 80 x 25 memory mapped video card (Slot 1) |
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Acorn 6809 card |
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custom acia card for comms |
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From the left a VIA card, a 40x20 teletext VDU card, a ram card ( one 2114 missing) |
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Windrush Eprom programmer and manual and original disk |
A eurocard rack system with a combination of cards including 6502 cpu, 6809 cpu, 32k static RAM, 32k battery backed CMOS RAM, disc interface, versatile interface adaptor, lab interface, econet, analogue interface, VDU interface and a 6502 ICE (In Circuit Emulation). Functionally it was a System 1 CPU card with extensions.
Similar
to the Systems 2,3 & 4 except that it had a 2 MHz 6502 and was the first Acorn
machine to be supplied with DRAM rather than static RAM
With a 6502 and 2k of memory with total expansion of 12k. It had an integer
only BASIC supplied in ROM as well as the OS. An extension ROM added floating
point operations to the BASIC. Econet became available for the machine in
late 1980 and a floppy drive plus DFS could be added. It was available in
DIY kit form
Prototype version of the BBC Model A. It was never released commercially under the Proton name and all prototypes became BBC prototypes when the BBC contract was won
Cut down version of the very BBC B. 16k of memory. Released November 1981
6502 processor and 32k of memory. Expandable to 4-16 sideways ROMs
Released November 1981 - early 1982. Also released was an American/Canadian version of the Model B that had several differences. Econet and Speech were included and the machine was set up for American monitors by default requiring a *UK to enable it to run most software.
64k of memory and DDFS. Released to fill the gap while the Master was produced
A BBC Model B+ on a eurocard for rack mounting.
Acorn's first attempt at entering the business market. A BBC Model B+ with a selection of second processors all packaged in a new case with an integral monitor and seperate keyboard. Second processors included a 32016 running Panos, 80186 running DOS and a Z80 running CPM. There are 8 models:
Acorn Business Computer Model PA (Personal Assistant)
Acorn Business Computer Model Terminal.
Acorn Business Computer Model 100.
Acorn Business Computer Model 110.
Acorn Business Computer Model 200.
Acorn
Business Computer Model 210. (Later known as the Cambridge Workstation)
Acorn Business Computer Model 300.
Acorn Business Computer Model 310.
A
cut down BBC B. Designed to be a cheap alternative to the model B, it had
alot of design trade offs in order to keep it cheap. It had expansion options
that offered upgrades to the same as those of a BBC B (the image here is an
electron with plus one and plus 3). In high demand initially, that demand
could not be met due to supply problems
An Electron with an expansion box containg a speech synthesier
and modem. Designed as a `smart` comms terminal.
A
comms machine based on a 65816 processor with an on board modem, comms software
and featured 32k of CMOS RAM.
Basically the same hardware as the communicator repackaged in a briefcase with an added ramcard interface
The successor to the Model B range. It was 4 different machines. The Master
128, Turbo, Scientific and 512. It came by default with a new and greatly
improved Disc Filing System called ADFS (Advanced Disc Filing System) as well
as 128k of memory as standard.
Released late January 1986 for the Master 128 and September 1986 Master Compact.
BBC Master Turbo, Scientific and 512
80186
(512)
80186 with 1 meg upgrade (512). The
512 requires the GEM discs to run DOS+
65C02 (Turbo)
32016 (Scientific) These were Master 128s with internal second processors
and sold as a complete package although a Master 128 can be upgraded very
easily by plugging in the co-processor
ET
(Econet Terminal) The Master ET was an Econet Terminal. It is missing most
of the ports on a Master 128. It only has Econet, RGB and Comp Video ports
at the back and no connectors underneath. Unlike the other Masters, the Master
ET does not have any applications in ROM (i.e. View, ViewSheet, Edit and Terminal).
These omissions reduced the cost of the Master ET to £399 (inc VAT).
Re-badged Olivetti M19 PC-clone. Based on an 8088 processor it also came with it's own monitor