INT 4F - ATA Software Programming Interface (ATASPI) - INSTALLATION CHECK
AX = 0082h
CX = 8765h
DX = CBA9h
Return: AH = 00h if installed
CX = 9ABCh
DX = 5678h
ES:DI -> "$ATAMGR$"
Note: this interface has probably appeared in some later revisions of ATASPI
than 0.72
SeeAlso: INT 21/AX=4402h"ATASPI",INT 4F/AX=0081h
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