IBM 560 (2640) Benutzerhandbuch
Power Shutdown Switch:
The power shutdown
switch resets the system regardless of the microcode
status and forces the power off. Use this push button to
power-off when power is not completely off or the
microcode is in a hung state.
status and forces the power off. Use this push button to
power-off when power is not completely off or the
microcode is in a hung state.
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IBM Mobile Systems - ThinkPad HMM Volume 3