The 75C4 is a 3U cPCI multifunction I/O and communications card. I/O signal routing conforms to PMC on cPCI specification PICMG 2.3, R1.0. The rear I/O J2 connector mimics cPCI carrier PMC I/O mapping. The “mother board” contains 3 independent module slots, two of which can be populated with a function specific module and the third with either a combination module featuring 4 multiplexed A/D channels and 28 Discrete I/O programmable channels, or with a reference supply. The enhanced Motherboard, using multiple DSP, allows for higher processing power and dedicated control for each module. This unique design eliminates the need for multiple, specialized single function cards by providing a single board solution for a broad assortment of I/O, Synchro/Resolver, LVDT and other signal interface functions that can be controlled either via the cPCI or 10/100/1000BaseT Ethernet. The available functions are listed on the following pages. Additionally, the 75C4 incorporates serial communications modules such as RS232/422/485 and ARINC 429. Our approach increases packaging density, saves enclosure slots, reduces power consumption and adds continuous background BIT testing. A Software Support Kit (SSK) is provided