Int 13 Fn 41  - Ibm/ms Int 13 Extensions - Installation Check              [d]

   AH = 41h
   BX = 55AAh
   DL = drive (80h-FFh)

Return: CF set on error (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)
       AL = internal use
       CX = API subset support bitmap (see #0203)
       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 0203)
 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 #0205,#0208)
 3-15  reserved (0)