The Intel/Microsoft APM specification provides a system that allows
computers (especially laptops) to conserve electricity.
See About Advanced Power Management for background information.
The APM specification defines the following functions:
Connection
Interface Connect Services needed?
INT 15H 5300H Installation check No
INT 15H 5301H Interface Connect No
INT 15H 5302H Interface Connect (Protected Mode/16-bit) No
INT 15H 5303H Interface Connect (Protected Mode/32-bit) No
INT 15H 5304H Interface Disconnect Yes
CPU Control Services
INT 15H 5305H CPU Idle Yes
INT 15H 5306H CPU Busy Yes
INT 15H 5307H Set Power State Yes
Status/Control Services
INT 15H 5308H Enable/Disable APM Functionality Yes
INT 15H 5309H Restore APM BIOS Defaults No
INT 15H 530aH Query Status No
Power Management Event Notification
INT 15H 530bH Get Power Management Event Yes
See Also: About APM
INT 15H (AT Extended Services)
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