Acorn System 4

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Introduction

The System 4 is disc-based computer housed in a double height rack with the capacity for up to 14 Eurocards. The minimum configuration is:

• 1MHz 6502 CPU,
• VDU Interface,
• 16K RAM,
• Floppy disc controller  with 2 floppy disc drives mounted in the top half of the rack.

Additional Eurocards can be added if required.

Manuals and documents

Here is the brochure for the Acorn System 4 Computer .

I don't have any manuals for the System 4.

System 4

I do not have a complete System 4, but here is a picture from the Control Universal Catalogue:

However I do have the System 4 case and some of the eurocards, donated by Ben Harris. The main items missing are the 2 disc drives that fit in the top rack. Also there is only an 8K static RAM card, as an Econet file server an additional 32 K would be nice. Finally there is no Operating System in ROM and I don't have the discs.

 Acorn System 4 case with some cards

 The Eurocards installed in the System 4, from left to right, are:

1. 1MHZ 6502 CPU  which has a connector for a System keyboard  .
2. 8K Static RAM 
3. 40 Column VDU Interface 
4. Econet 
5. Universal Interface Board  (lacks faceplate)

The remaining cards are incomplete duplicates, except for the Bus Extender  on the far right.

 Acorn System 4 with card removed

 Acorn System 4 with the top cage removed

 Acorn System 4 with card guides and power switch removed

 Acorn 14-slot backplane

 Acorn System 4 from top showing the power supply

 Acorn System 4 right hand side

 Acorn System 4 (back)

Acorn System 4 (bottom)