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AX = 5300h BX = device ID of system BIOS (0000h)
Return:
CF clear if successful AH = major version (BCD) AL = minor version (BCD) BX = 504Dh ("PM") CX = flags (see #00472) CF set on error AH = error code (06h,09h,86h) (see #00473)
BUG: Early versions of the Award Modular BIOS with built-in APM support reportedly do not set BX on return
Bitfields for APM flags: Bit(s) Description (Table 00472) 0 16-bit protected mode interface supported 1 32-bit protected mode interface supported 2 CPU idle call reduces processor speed 3 BIOS power management disabled 4 BIOS power management disengaged (APM v1.1) 5-7 reserved
(Table 00473) Values for APM error code: 01h power management functionality disabled 02h interface connection already in effect 03h interface not connected 04h real-mode interface not connected 05h 16-bit protected-mode interface already connected 06h 16-bit protected-mode interface not supported 07h 32-bit protected-mode interface already connected 08h 32-bit protected-mode interface not supported 09h unrecognized device ID 0Ah invalid parameter value in CX 0Bh (APM v1.1) interface not engaged 0Ch (APM v1.2) function not supported 0Dh (APM v1.2) Resume Timer disabled 0Eh-1Fh reserved for other interface and general errors 20h-3Fh reserved for CPU errors 40h-5Fh reserved for device errors 60h can't enter requested state 61h-7Fh reserved for other system errors 80h no power management events pending 81h-85h reserved for other power management event errors 86h APM not present 87h-9Fh reserved for other power management event errors A0h-FEh reserved FFh undefined
Category: Power Management - Int 15h - A
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