INT 1A - Tandy 2500, Tandy 1000L series - START PLAYING DIGITAL SOUND
AH = 83h
AL = volume (0=lowest, 7=highest)
CX = number of bytes to play
DX = time between sound samples (multiples of 273 nanoseconds)
ES:BX -> sound data (array of 8-bit PCM samples)
Return: ???
Notes:  this call returns immediately while the sound plays in the
background
The sound data pointed to by ES:BX probably shouldn't cross a 64k
boundary.  The BIOS appears to call INT 15/AX=91FBh when the sound
device underflows to allow another INT 1A/AH=83h for seamless
playing of long sounds.
SeeAlso: INT 15/AH=91h

See also: 1A84

1A83 - Tandy 2500, Tandy 1000L series - START PLAYING DIGITAL SOUND