INT 94 u - PCM driver - INITIALIZE DMA BUFFER
        SI = 0003h
        ES:BX -> parameters (see below)
Return: ???
SeeAlso: SI=0000h,SI=000Ah,SI=000Bh

Format of parameters:
Offset  Size    Description
 00h    DWORD   -> DMA buffer
 04h    WORD    size of DMA buffer
 06h    WORD    number of divisions

.