Creative SB0350 Programming Manual page 54

3. Turn off the DAC speaker.
outp(wSBCBaseAddx+0xC, 0xD3)
4. Disable the interrupt used.
5. Restore the original interrupt service routine.
6. Release the allocated DMA buffer.
During high-speed DMA mode data I/O, the DSP will not accept any further
commands. Hence, to stop data transfer before the end of a block, send the reset DSP
command.
Digitized Sound I/O Programming 3-25