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In page Cray-1:
"The initial model, the Cray-1A, weighed 10,500 pounds (4,800 kg) including the Freon refrigeration system. Configured with 1 million words of main memory, the machine and its power supplies consumed about 115 kW of power;[2] cooling and storage likely more than doubled this figure.[citation needed] A Data General SuperNova S/200 minicomputer served as the maintenance control unit (MCU), which was used to feed the Cray Operating System into the system at boot time, to monitor the CPU during use, and optionally as a front-end computer. Most, if not all, Cray-1As were delivered using the follow-on Data General Eclipse as the MCU.