Int 13 Fn 8006  - Fast! V4.02+ - Installation Check                        [c]

   AX = 8006h
   CX = 6572h
   DX = 1970h
   ES:BX -> request packet (see below)

Return: AX = 1965h if installed

See Also: AH=80h,AX=8001h,AX=8007h

Format of request packet:
Offset Size    Description
 00h   DWORD   -> 19-byte signature string (see AH=80h)