Big Red Switch
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<jargon> (BRS) IBM jargon for the power switch on a computer,
especially the "Emergency Pull" switch on an IBM mainframe or
the power switch on an IBM PC where it really is large and red.
"This !@%$% bitty box is hung again; time to hit the Big Red
It is alleged that the emergency pull switch on an IBM 360/91
actually fired a non-conducting bolt into the main power feed; the
BRSes on more recent mainframes physically drop a block into place
so that they can't be pushed back in. People get fired for
pulling them, especially inappropriately (see also molly-guard).
Compare power cycle, three-finger salute, 120 reset; see
also scram switch.
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