The Motherboard Module 2 is a CubeSat Kit (CSK)-compatible host for the COTS BeagleBone Black (BBB) Rev C and compatible variants thereof. When installed onto an MBM 2, the BBB interfaces to the CSK electrical bus via standardized signals. Additional features like a Real-Time Clock (RTC) with battery backup and a full-size SD Card operating in SPI mode are also provided.

Four and a half UARTs (two with -CTS/-RTS flow control), one SPI, one I2C, five general-purpose outputs and one general-purpose input are mapped between the BBB and the CSK bus connector.