Int 21 Fn FD12  - Gravis Ultrasound - Megaem/mega_em - Installation Check  [s]

   AX = FD12h
   BX = 3457h

Return: AX = 5678h if installed
   BX = 1235h if v1.x or v2.x installed
       CL = interrupt vector used by MegaEm (default 81h)
   BX = 1237h if v3.x installed
       CL = interrupt vector used by MegaEm (default 81h)
       DX = version number
Program: MegaEm is a protected-mode SoundBlaster, SoundCanvas, and MT-32
     emulator for the Gravis UltraSound

See Also: INT 2F/AX=CD00h/BX=464Fh,INT 7E/AX=00FEh"SBOS",INT 81/AX=0200h