Int 62 Fn C0  U - Gwbtsr - Api                                             [s]

   AH = C0h
   AL = function
       00h installation check

       Return: AX = 00FFh if installed
       01h ???
Program: GWBTSR is a huge (48K) resident mixer controller for the Gateway 2000
     sound card (OEM version of Aztech Sound Galaxy)
Index: installation check;GWBTSR