Each MEGA-IO card adds the following functions to the Raspberry Pi:
- Eight on-board relays
- Eight 12 bit A/D inputs
- Eight optically isolated inputs
- One 12 bit DAC Output
- Four open collector outputs
- Six GPIO's
Up to four MEGA-IO cards can be stacked on top of a Raspberry Pi.
Any of the inputs of the MEGA-IO can be configured as interrupt inputs.