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System/34 - THE FOUR LIGHTS

System/34 - THE FOUR LIGHTS: Encyclopedia II - System/34 - THE FOUR LIGHTS

The four red lights on the System/34 were as follows: (1) Power check. (2) Processor check. (3) Program check. (4) Console check. If any of the first three lights ever come on, the system must be IPLed. Console can be restored if it has been powered off, but the other conditions are unrecoverable. ...

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System/34: Encyclopedia II - System/34 - THE FOUR LIGHTS

System/34 - THE FOUR LIGHTS

The four red lights on the System/34 were as follows: (1) Power check. (2) Processor check. (3) Program check. (4) Console check.

If any of the first three lights ever come on, the system must be IPLed. Console can be restored if it has been powered off, but the other conditions are unrecoverable.