Acorn A4000

The Acorn A4000 placed the ARM250 chipset in a separate desktop case with an 80MB hard disc and PC-style keyboard. It offered the A3020 generation in a more conventional office and secondary-school form.

The A4000 was the last mainstream desktop derived directly from the original Archimedes memory architecture before the Risc PC and A7000 generations.

Notable Features

• Acorn ARM250 at 12 MHz provides the system’s processing architecture.
• The standard memory configuration was 2MB; expandable to 4MB.
• Storage was supplied as 1.6MB floppy drive and 80MB IDE hard disc.

Historical Significance

• The A4000 was the last mainstream desktop derived directly from the original Archimedes memory architecture before the Risc PC and A7000 generations.
• This record separates a genuine processor, memory, enclosure or storage model from software bundles and dealer-only configurations.

Collector’s Notes

• Confirm the exact model from its front badge and rear serial label because many Acorn systems were upgraded during their working lives.
• Original monitors, three-button mice, keyboards, expansion podules, manuals and installation media add historical value.

Specifications

Technical Information
Name	Acorn A4000
Manufacturer	Acorn Computers
Launched	Tuesday, September 1, 1992
Discontinued	1994
Country	United Kingdom
CPU	Acorn ARM250 at 12 MHz
Units Sold
Operating System	RISC OS 3.11
I/O	Video, audio, serial, parallel, network option and one internal podule slot
Keyboard	Separate PC-style keyboard and three-button mouse
Storage	1.6MB floppy drive and 80MB IDE hard disc
Sound	Eight-channel, eight-bit stereo sound
Graphics	Integrated VIDC in ARM250 supporting RISC OS display modes
Display	External RGB or VGA monitor
ROM	2MB RISC OS ROM
RAM	2MB; expandable to 4MB
CPU Speed	12 MHz