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Watford Electronics BBC User I/O card (top)
Watford Electronics BBC User I/O card (back)
Watford Electronics BBC User I/O card (bottom)
The Watford Electronics BBC User I/O card provides an Archimedes computer with BBC compatible User and Analogue ports which allows hardware and software designed for the BBC micro to run on a Archimedes. The card uses a 65SC22 chip to control the user port and a NEC D7002C analog to digital converter for the Analogue port.
Here is the Watford Electronics BBC A3000 I/O Card User Guide .