INT 16 - HP HIL Vectras - HP HIL Extended BIOS INSTALLATION CHECK
        AX = 6F00h
        BX = 0000h
Return: BX = 4850h if present
Notes:  called by recent MS Mouse drivers looking for an HP-HIL mouse
        supported by ES, QS, and RS series HP Vectras
SeeAlso: AX=6F0Dh

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