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AH = 41h BX = 55AAh DL = drive (80h-FFh)
Return:
CF set on error (extensions not supported) AH = 01h (invalid function) CF clear if successful BX = AA55h if installed AH = major version of extensions 01h = 1.x 20h = 2.0 / EDD-1.0 21h = 2.1 / EDD-1.1 30h = EDD-3.0 AL = internal use CX = API subset support bitmap (see #00271) DH = extension version (v2.0+ ??? -- not present in 1.x)
Note: The Phoenix Enhanced Disk Drive Specification v1.0 uses version 2.0 of the INT 13 Extensions API
See Also: AH=42h"INT 13 Ext" - AH=48h"INT 13 Ext"
Bitfields for IBM/MS INT 13 Extensions API support bitmap: Bit(s) Description (Table 00271) 0 extended disk access functions (AH=42h-44h,47h,48h) supported 1 removable drive controller functions (AH=45h,46h,48h,49h,INT 15/AH=52h) supported 2 enhanced disk drive (EDD) functions (AH=48h,AH=4Eh) supported. Extended drive parameter table is valid (see #00273,#00278) 3-15 reserved (0)
Category: Disk I/O Enhancements - Int 13h - I
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