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be careful
Authored by: serres on Feb 28, '02 09:05:20PM

there's an PMU reset on almost every mac, even the old 68k machines (at least the powerbooks, probably every mac which supports sleep mode). generally it works the way that you unplug ALL power, including batteries, than press the reset button for 10 seconds or so and than wait ... and finally you have to leave the computer or AC adaptor plugged in for at least 1 to 2 days! take a look in the apple knowledge base and do not play with this stuff.

the PMU ("Power Management Unit") is some sort of superchip running all the time, which can reset are start the CPU, switch on/off peripherals etc. you can imagine that this can be done with some wires :).

it's also responsible for the autowake and autopower feature (choose a time when you ibook wakes up!) -- sadly not enabled in current mac os x. but there is activity going on in the darwin source, including a command line utility to set the PMU features. so let's hope that ibook can be used as mp3 alarm clocks in the near future.



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