Int 13/AH=41h/BX=55AAh

IBM/MS INT 13 Extensions - INSTALLATION CHECK

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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