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 IBM Digitized Sound Package DIGPAK is a set of digitized sound drivers written by John W. Ratcliff, The Audio Solution, Inc. SeeAlso: AX=068Eh