INT 66 - IBMSND driver, DIGPAK - REPORT CALLBACK ADDRESS                        
	AX = 0691h
Return: AX:DX -> current callback function
	BX = original caller's DS register
Program: The IBMSND driver is part of John W. Ratcliff's
	   The IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. Digitized Sound Package
	DIGPAK is a set of digitized sound drivers written by
	  John W. Ratcliff, The Audio Solution, Inc.
SeeAlso: AX=068Eh