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The Acorn Business Computer (ABC) was produced from 1984 by the British company Acorn Computers. The series of eight computers was aimed at the business, research and further education markets.

The system was developed by Acorn essentially as a repackaged BBC Micro with a second processor to complement the Micro's 6502. The Zilog Z80, Intel 80286 and National Semiconductor 32016 were all used as second processors in the various models. Two of the eight models produced, the Personal Assistant (PA) and the Terminal, had no second processor. Despite having a ROM-based operating system, most of the users ran different operating systems. The ABC 100 and 110 were usually ran with CP/M, the 200 and 210 were mostly run with Xenix, and the 300 and 310 usually ran with either MS-DOS, CP/M-86, or PC-DOS.

Range and specificationsEdit

Model PAEdit

  • 64 KB RAM
  • 6502 processor running at

Model TerminalEdit

  • 64 KB RAM.
  • No file system by default.
  • 6502 processor running at 2 MHz
  • 32 KB of operating system in ROM with a VT100 emulator.


Model 100Edit

  • 64 KB RAM.
  • Disc Filing System by default.
  • Z80 processor. (6502 processor acting as host for parasite Z80)

Model 110Edit

Model 200Edit

Model 210/Cambridge WorkstationEdit

  • 4 MB of RAM
  • 32016 parasite with a 6502 host.
  • 10 MB HDD

Model 300Edit

  • 1024 KB RAM memory.
  • Disc Filing System by default.
  • 80286 processor. (6502 processor acting as host for parasite 80286)

Although the Model 300 hand a 32 KB embedded operating system, mosr people used CP/M-86, MS-DOS, or PC-DOS instead as those systems were more popular at the time.


List of Acorn Computers microcomputers

Computers: Microcomputer SystemAtomBBC Micro (aka Proton)ElectronCommunicatorBusiness ComputerBBC MasterArchimedes rangeRisc PC · Network ComputerSet-Top BoxPhoebe

Operating systems: Acorn MOSPanos · ArthurARXRISC iXRISC OS



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