IS215VCMIH2C is a VME Bus Master Controller Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Control Systems. The communication link between the controller and the I/O boards, as well as the link to the IONet system control network, is provided by the VME Bus Master Controller (VCMI) board. The IDs for all the boards in the rack and their corresponding terminal boards are managed by VCMI, which is also the VME bus master in the control and I/O racks.