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Acorn "Duet" ARM610 2nd processor (front)
Acorn "Duet" ARM610 2nd processor (back)
The Acorn Duet card was developed to test the 2nd processor socket in the RiscPC (codename "Medusa"). It has a GPS P611ARM-PR CPU clocked at 30MHz. The Serial No. implies it is no. 8 and I suspect that very few were made, it was never developed as a product for sale.
Here is the Duet - Medusa 2nd ARM Processor Functional Specification