一个类似windows

				/*
				 * COPYRIGHT:        See COPYING in the top level directory
				 * PROJECT:          ReactOS kernel
				 * FILE:             drivers/dd/sound/dsp.c
				 * PURPOSE:          Digital Signal Processing ?
				 * PROGRAMMER:       Snatched from ?
				 *
				 * UPDATE HISTORY:
				 *              ??/??/??: Created
				 * 		10/23/02: Steven Edwards (Steven_Ed4153@yahoo.com)
				 *			  Minor build fix
				 */
				
				#include "sb16.h"
				#include "dsp.h"
				
				/************************************
				 * unsigned char read_dsp(void)
				 *
				 * Reads the DSP chip
				 * Arguments: none
				 * Returns: Byte read
				 ************************************/
				unsigned char read_dsp(unsigned short base)
				{
				//	while((inb(base+0x0e)&0x80)==0);	//Wait until there is something to read
				//	return	inb(base+0x0a);
					return 0;
				}
				
				/************************************'
				 * sb_status detect_dsp(void);
				 *
				 * Detects if a SB16 is installed
				 * Arguments: None
				 * Returns: Success or failure
				 ************************************/
				sb_status detect_dsp(SB16* sb16)
				{
					for(base=0x200;base						if(reset_dsp(base)==SB_TRUE)
						{
							sb16->base=base;
						 	return SB_TRUE;
						}
					return SB_FALSE;
				}
				
				/**************************************
				 * sb_status reset_dsp(unsigned short base_address);
				 *
				 * Tries to reset a DSP chip
				 * Arguments: base address
				 * Returns: Success of failure
				 **************************************/
				sb_status reset_dsp(unsigned short base_address)
				{
				//	int delay;
				
				//	outb(base_address+DSP_RESET_PORT,1);
				//	for(delay=0;delay				
				//	outb(base_address+DSP_RESET_PORT,0);
				//	for(delay=0;delay				
				//	if((inb(base_address+DSP_READ_STATUS_PORT)&0x80)==0) return SB_FALSE;
				
				//	if(inb(base_address+DSP_READ_DATA_PORT)!=0xAA) return SB_FALSE;
				
					return SB_TRUE;
				}
				
				void write_dsp(unsigned short base,unsigned char data)
				{
				//  while ((inb(base+DSP_WRITE_PORT) & 0x80) != 0);
				//  outb(base+DSP_WRITE_PORT, data);
				}