Energy Saver Schedule

what is the hardware mechanism that allows for the OS X to automatically startup and shutdown
chrolson wrote on :
Just curious, what is the hardware mechanism that allows for the OS X to automatically startup and shutdown via setting the Energy Saver Schedule?
Mike Rosenberg replied on :

chrolson@redacted.invalid chrolson@redacted.invalid wrote:

Just curious, what is the hardware mechanism that allows for the OS X to automatically startup and shutdown via setting the Energy Saver Schedule?

Um, how about a timer? I mean, I can have a table lamp turn on and off at scheduled times using that mechanism, so why shouldn't a computer use one?

Clever Monkey replied on :

On Feb 10, 9:08 am, "chrol...@redacted.invalid" chrol...@redacted.invalid wrote:

Just curious, what is the hardware mechanism that allows for the OS X to automatically startup and shutdown via setting the Energy Saver Schedule?

A real-time clock and a non-maskable interrupt, probably.

Jolly Roger replied on :

On 2007-02-10 08:08:00 -0600, "chrolson@redacted.invalid" chrolson@redacted.invalid said:

Just curious, what is the hardware mechanism that allows for the OS X to automatically startup and shutdown via setting the Energy Saver Schedule?

The Power Management Unit (PMU) is an integrated chip on the motherboard.

Matthew T. Russotto replied on :

In article 1171116480.507294.20550@redacted.invalid, chrolson@redacted.invalid chrolson@redacted.invalid wrote:

Just curious, what is the hardware mechanism that allows for the OS X to automatically startup and shutdown via setting the Energy Saver Schedule?

A proprietary microcontroller called the PMU (Power Management Unit) in later PowerPC Macs. It appears this function is part of another proprietary microcontroller called the System Management Controller in the Intel macs.