... for higher driving capacity than 8255 Main Features72 TTL digital I/O lines Emulates mode 0 of 8255 PPI ... critical I/O monitoring Keeps I/O setting and digital output values when hot system reset Supports dry contact ... and wet contact The MIC-3753 is a 72-channel digital I/O card for ... C0, A1, B1, C1, A2, B2, C2, A3, B3 and C3. Users can configure each port as input or output ...