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 !
BUILT IN LANGUAGE
Full-stroke PC 102 keys style
ARM 250 32 bit RISC
MEMC (memory), VIDC (Video and Sound), IOC (I/O)
2 to 4 MB
Up to 132 columns x 32 rows
VGA video output. Several graphic modes. Among them 640 x 256 or 512 pixels
Palette of 4096 colours
8 voices synthesizer
Centronics, RS423, VGA, 1 expansion slot (same as A3000, A3010 and A3020)