INT 16 - PC-Cache v6+ - INSTALLATION CHECK AX = FFA5h CX = 1111h Return: CH = 00h if installed ES:DI -> internal data (see #00620) CL = cache state 01h enabled 02h disabled SeeAlso: INT 13/AH=27h,INT 13/AH=A0h,INT 21/AH=2Bh/CX=4358h