INT 2F - xDISK v3.32+ - INSTALLATION CHECK
AH = DDh
BX = 7844h ('xD')
CX = 4953h ('IS')
DX = 4B3Fh ('K?')
AL = desired drive (01h-1Ah) or 00h to check for xDISK on any drive
ES:DI -> 25-byte data buffer (see #03099)
Return: AX = DDFFh if installed (on specified drive if AL nonzero on entry)
BX = 87BBh
DX = B4C0h
ES:DI buffer filled
CX,CF destroyed
SeeAlso: INT 21/AX=4404h"xDISK",INT 21/AX=4405h"xDISK"