ay8910.h

这个是延伸mame的在wince平台下的游戏模拟器的代码

#ifndef AY8910_H
#define AY8910_H


#define MAX_8910 5

struct AY8910interface
{
	int num;	/* total number of 8910 in the machine */
	int baseclock;
	int volume[MAX_8910];
	int (*portAread[MAX_8910])(int offset);
	int (*portBread[MAX_8910])(int offset);
	void (*portAwrite[MAX_8910])(int offset,int data);
	void (*portBwrite[MAX_8910])(int offset,int data);
	void (*handler[MAX_8910])(void);	/* IRQ handler for the YM2203 */
};


void AY8910_reset(int chip);

void AY8910_set_clock(int chip,int _clock);

/*
** set output gain
**
** The gain is expressed in 0.2dB increments, e.g. a gain of 10 is an increase
** of 2dB. Note that the gain only affects sounds not playing at full volume,
** since the ones at full volume are already played at the maximum intensity
** allowed by the sound card.
** 0x00 is the default.
** 0xff is the maximum allowed value.
*/
void AY8910_set_volume(int chip,int volume,int gain);


void AY8910Write(int chip,int a,int data);
int AY8910Read(int chip);


int AY8910_read_port_0_r(int offset);
int AY8910_read_port_1_r(int offset);
int AY8910_read_port_2_r(int offset);
int AY8910_read_port_3_r(int offset);
int AY8910_read_port_4_r(int offset);

void AY8910_control_port_0_w(int offset,int data);
void AY8910_control_port_1_w(int offset,int data);
void AY8910_control_port_2_w(int offset,int data);
void AY8910_control_port_3_w(int offset,int data);
void AY8910_control_port_4_w(int offset,int data);

void AY8910_write_port_0_w(int offset,int data);
void AY8910_write_port_1_w(int offset,int data);
void AY8910_write_port_2_w(int offset,int data);
void AY8910_write_port_3_w(int offset,int data);
void AY8910_write_port_4_w(int offset,int data);

int AY8910_sh_start(struct AY8910interface *interface,const char *chipname);
void AY8910_sh_stop(void);
void AY8910_sh_update(void);

#endif