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Switch Interface Card (SIC)
The SIC is a daughterboard for the rDIM although it can also be used standalone as well.
It primarily provides a means to interface the rDIM to a number of switches, analogue joysticks and indicator LEDs as would be found in a typical control console.
When used as an rDIM daughterboard, the rDIM supplies the necessary power for the SIC and transfers data via the rDIM daughterboard connector. In order to allow the SIC to be used standalone, it includes a local power supply section and connector and 2 serial port connectors for data transfer.
A secondary capability of the SIC is to implement a USB Host and Device interface for use with any USB connected devices such as a keyboard or mouse.
Further technical information is available here.