Advance Power Management (APM) Functions

 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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