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Acorn ANC21 Universal 2nd Processor Unit

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Acorn Universal 2nd Processor Unit (front)

Acorn ANC21 Universal 2nd Processor Unit (front) 

Acorn Universal 2nd Processor Unit right

Acorn ANC21 Universal 2nd Processor Unit (right)  

Acorn Universal 2nd Processor Unit back

 Acorn ANC21 Universal 2nd Processor Unit (back) 

Acorn Universal 2nd Processor Unit bottom

Acorn ANC21 Universal 2nd Processor Unit (bottom) 

The serial number, on the bottom, is 03-ANC21-1000861.

Acorn Universal 2nd Processor Unit open

Acorn ANC21 Universal 2nd Processor Unit open with co-processor 

Acorn Universal Second Processor with an Acorn ADC06 6502 Co-processor fitted.

Acorn Universal 2nd Processor Unit without co-processor

Acorn ANC21 Universal 2nd Processor Unit open without co-processor

The Acorns Universal Second Processor Unit allows a Master Co-processor to be fitted inside and used as a second processor with a BBC Micro or external co-processor with a BBC Master 128.

Here is the Acorn brochure APP111 Universal Second Processor .