Re: What else does power to mobo actually do?

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On Tue, 24 May 2005 09:49:53 +0100, Franklin

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5VSB keeps the logic available to turn on the system and
keep the clock from draining battery.

This includes any PCI devices triggering power on, a bios
setting for turning on at a user-specified time, a setting
to turn on (or not, or same-state) after a power failure,
and triggering system on by any other devices the
motherboard manufacturer implements.  They may implement a
WOL (wake on lan) header for a network adapter, but more
commonly on modern systems the network adapter uses a PCI
feature to do this.  5VSB and sometimes 3V-derived (via
motherboard or rarely from proprietary systems) power to the
PCI slots enable this.

For example, it's now more common to be able to turn a
system on by PS2 or USB keyboard or mouse.  TYpically there
is a motherboard jumper to determine if the main 5V rail or
the 5VSB rail is used to power the USB and/or PS2 ports,
with the 5VSB being necessary for the device availability to
turn system on.

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