Int 66 Fn 0688  - Ibmsnd Driver, Digpak - Play 8-bit Digitized Sound       [s]

   AX = 0688h
   DS:SI -> SNDSTRUC (see #3190)

Return: ???
Program: The IBMSND driver is part of John W. Ratcliff's
      The IBM Digitized Sound Package
   DIGPAK is a set of digitized sound drivers written by
     John W. Ratcliff, The Audio Solution, Inc.

Note:  the installation check consists of looking for a valid signature
     string six bytes prior to the interrupt handler; this string may
     be either "KERN" or "MIDI" (in the latter case, call AX=0701h to
     determine whether IBMSND is installed)

See Also: AX=068Bh,AX=068Fh,AX=0701h

Format of IBMSND driver SNDSTRUC:
Offset Size    Description (Table 3190)
 00h   DWORD   -> audio data
 04h   WORD    length of audio data in bytes
 06h   DWORD   -> playback status flag
 0Ah   WORD    playback frequency