Mini I/O card for Casio FX850/880P

A marked difference between large and small computers is the number ot possibilities available tor communication with peripheral devices. In particular pocket-size personal computers, like the Casio FX850/880P,could do with a tew communication extensions. The I/O extension card described in this article adds an RS232 interface and a parallel printer port to the Casio FX850/880 pocket computer.