INT 94 u - PCM driver - INITIALIZE USER FUNCTION                                
	SI = 0004h
	ES:BX -> parameters (see #03999)
Return: ???
SeeAlso: SI=0000h,SI=0001h


Format of PCM driver function 0004h parameters:
Offset	Size	Description	(Table 03999)
 00h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	-> user function