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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:
Additional Eurocards can be added if required.
Here is the brochure for the Acorn System 4 Computer .
I don't have any manuals for the 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:
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)