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Risc Developments ECO/IO board (top)
Risc Developments ECO/IO board (back)
The Risc Devlopments ECO/IO board is a mini podule which provides a BBC User port and Analogue port for A30x0 and A4000 computers. On this card there is a 3rd port in the middle, which is not fitted, I am not sure what it was intended to be or if there was an upgrade for it.