Acorn System Computers

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Introduction

The Acorn System 3 is disc-based computer in a card frame. A minimum System 3 configuration is:

• 1MHz 6502 CPU
• VDU interface
• 8K RAM with 4K BASIC ROM
• Floppy disc controller
• 100K 5.¼" disc drive mounted in the card frame.

Additional cards can be added as required.

Acorn also produced a 6809 CPU  card to create a disc-based system running the FLEX OS.

Manuals and documents

Here is a brief description of FLEX for Acorn 6809 Systems .

System 3

I bought this System 3 in September 2004 from eBay. The computer came with FLEX OS manuals and discs but I have not yet got round to scanning or archiving them. The System 3 has:

• 80 x 25 character VDU card
• 3 x Acorn Memory cards
• Acorn 6809 CPU card
• Custom RS232 serial card (can drive a PC comms port via a null modem cable)
• Acorn floppy disc controller card
• 2 x Tandon 40 track SS SD floppy disc drives (1 in card rack, the second external)

 Acorn System 3 (front)

 Acorn System 3 (right side)

 Acorn System 3 (bottom)

 Acorn System 3 (back)