INT 66 - IBMSND driver, DIGPAK - SET CALLBACK ADDRESS AX = 068Eh BX:DX -> callback function 0000h:0000h to disable callback DS = value to load into DS when calling the callback function Desc: specify the function to be called when playback of a sound effect is completed Note: the callback function will typically be called during a hardware interrupt, so all the usual precautions should be taken except for preserving registers SeeAlso: AX=0691h