Acorn Archimedes A305

The Acorn Archimedes A305 was the entry member of the first commercial ARM-based desktop range. It combined the 8 MHz ARM2, MEMC memory controller, VIDC video and IOC input/output chips in a modular desktop case.

The A305 helped introduce the ARM architecture as a complete personal-computer platform and began the Archimedes family that later adopted RISC OS.

Notable Features

• Acorn ARM2 at 8 MHz provides the system’s processing architecture.
• The standard memory configuration was 512KB; expandable to 1MB or more with upgrades.
• Storage was supplied as 800KB 3.5-inch floppy drive; optional external or internal hard-disc upgrades.

Historical Significance

• The A305 helped introduce the ARM architecture as a complete personal-computer platform and began the Archimedes family that later adopted RISC OS.
• 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 Archimedes A305
Manufacturer	Acorn Computers
Launched	Monday, June 1, 1987
Discontinued	1989
Launch Price	£799 plus VAT
Country	United Kingdom
CPU	Acorn ARM2 at 8 MHz
Units Sold
CPU Speed	8 MHz
RAM	512KB; expandable to 1MB or more with upgrades
ROM	512KB Arthur ROM
Display	External RGB, monochrome or multiscan monitor
Graphics	Acorn VIDC; resolutions up to 1152 x 896 monochrome or 640 x 512 colour depending on monitor
Sound	Eight-channel, eight-bit stereo sound
Storage	800KB 3.5-inch floppy drive; optional external or internal hard-disc upgrades
Keyboard	Separate 103-key keyboard and three-button mouse
I/O	Video, stereo audio, serial, parallel, Econet option and two internal podule slots
Operating System	Arthur 0.20 initially; upgradeable to Arthur 1.2 and RISC OS