design that gives the maximum flexibility

of implementation. It has 48 point

82C55 mode 0 compatible I/Os with

extendable driving capacity (adopt

74HC245 as buffer). Not only the

emulate the basic function of 82C55, we

also provide 16 extra nibble

programmable I/O for your best

performance/cost result. For the most

convenience of the user the connectors are OPT022 compatible and the circuit

diagram of the card also provided.