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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

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

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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