The TINI DS80C400 microcontroller evaluation (EV) kit (comprised of the TINIm400 module and TINIs400 socket) provides an excellent platform for evaluating the TINI hardware and software. The EV kit is, however, limited by scarce general-purpose IO (GPIO) pins. This application note explains how to add a CPLD (complex programmable logic device) to the socket board to provide a 32-bit, parallel IO interface.