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 !
Hi, 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
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.