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A > ACORN COMPUTER  > Archimedes A4000   

Acorn Computer
Archimedes A4000

The Acorn A4000 was a slightly cheaper cut down A5000, with a shorter case, one expansion slot and an ARM250 processor.

Curiously, the machine had its floppy and hard drive fixed to the chassis with a wire clip which meant these could be quickly replaced without tools, whereas replacing the hard disk on the A5000 was a more fiddly operation requiring the expansion slot plane and the whole chassis holding the drives to be removed.

Many of the features (ARM250, VGA screen modes, RISC OS 3) of this model were implemented into the lower end A3010 and A3020 computers.

The keyboard was a much cheaper type more similar to a generic PC unit.

A rare 486 PC emulator on a card was available, similar cards became popular on the later RISC PC models.

Information supplied by Jonathan Hayward

Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).

Special thanks to Darren Mc Moran who donated us this computer !


My old A4000 is sick, when it is booting there is a message "Internal error: undefined instruction at $03877AC8" does anyone have any clues about this ?? Is it corruption on hard drive or does this indicate hardware problems? or is the old machine on the way to the scrap yard?

Tuesday 1st February 2011
Chris (UK)

Hi Jamie,

Thank you for your post! Im pleased to report I got the A4000 up and running and it now has an A3000 to keep it company.



Saturday 27th November 2010
Dean Graham (Selby, UK)


You are probably not going to see this but yes it will work with a VGA monitor. PS2 Keyboard and mouse? I dont know

Monday 22nd November 2010


NAME  Archimedes A4000
MANUFACTURER  Acorn Computer
TYPE  Professional Computer
ORIGIN  United Kingdom
YEAR  september 1992
KEYBOARD  Full-stroke PC 102 keys style
CPU  ARM 250 32 bit RISC
CO-PROCESSOR  MEMC (memory), VIDC (Video and Sound), IOC (I/O)
RAM  2 to 4 MB
TEXT MODES  Up to 132 columns x 32 rows
GRAPHIC MODES  VGA video output. Several graphic modes. Among them 640 x 256 or 512 pixels
COLORS  Palette of 4096 colours
SOUND  8 voices synthesizer
I/O PORTS  Centronics, RS423, VGA, 1 expansion slot (same as A3000, A3010 and A3020)
BUILT IN MEDIA  One 3.5'' FDD, 0 to 210 MB HDD
OS  RISC OS 3.11
POWER SUPPLY  Built-in power supply unit
PRICE  Approx. £800

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