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IBM System/36
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====System/36 Model 5360==== The System/36 5360 was the first model of System/36. It weighed 700 lb (318 kg), cost $140,000 and is believed to have had processor speeds of about 2 MHz and 8 MHz for its two processors. The system ran on 208 or 240 volts AC. The five red lights on the System/36 were as follows: (1) Power check. (2) Processor check. (3) Program check. (4) Console check. (5) Temperature check. If any light other than #4 ever came on, the system needed to be rebooted. Console can be restored if it has been powered off, but the other conditions are unrecoverable. There were various models of the 5360, including a C and D model that dealt with speed and the ability to support an additional frame to house two additional drives.
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