www.pudn.com > ngcd080s.zip > z80intrf.c

/************************ 
*** Z80 CPU Interface *** 
************************/ 
 
//-- Include Files ---------------------------------------------------------- 
#include	"../ym2610/ym2610.h" 
#include 	 
#include 	 
#include	"mz80.h" 
 
//-- Exported Functions ----------------------------------------------------- 
void	PortWrite(UINT16 PortNo, UINT8 Value, struct z80PortWrite *ptr); 
UINT16	PortRead(UINT16 PortNo, struct z80PortRead *ptr); 
UINT16 PortRead2(UINT16 PortNo, struct z80PortRead *ptr); 
 
//-- Structures ------------------------------------------------------------- 
struct	z80PortRead ReadPorts[] = 
{ 
	{0x0000,		0xffff,		PortRead}, 
	{(UINT16)-1,	(UINT16)-1,	NULL} 
}; 
 
struct	z80PortWrite WritePorts[] = 
{ 
	{0x0000,		0xffff,		PortWrite}, 
	{(UINT16)-1,	(UINT16)-1,	NULL} 
}; 
 
struct MemoryReadByte	MemRead[] = 
{ 
	{(UINT16)-1,	(UINT16)-1,	NULL} 
}; 
 
struct MemoryWriteByte	MemWrite[] = 
{ 
	{(UINT16)-1,	(UINT16)-1,	NULL} 
}; 
 
//-- Variables -------------------------------------------------------------- 
CONTEXTMZ80	subcpu_context; 
UINT8		subcpu_memspace[65536]; 
int			sound_code = 0; 
int			pending_command = 0; 
int			result_code = 0; 
int			z80_cycles = Z80_VBL_CYCLES; 
 
//--------------------------------------------------------------------------- 
void z80_init(void) 
{ 
	subcpu_context.z80Base = subcpu_memspace; 
	 
	subcpu_context.z80IoRead  = ReadPorts; 
	subcpu_context.z80IoWrite = WritePorts; 
	 
	subcpu_context.z80MemRead = MemRead; 
	subcpu_context.z80MemWrite = MemWrite; 
	 
	mz80SetContext((void *)&subcpu_context); 
	 
	mz80reset(); 
 
	// Let Z80 do its initialization 
	mz80exec(100000); 
} 
 
//--------------------------------------------------------------------------- 
void PortWrite(UINT16 PortNo, UINT8	Value, struct z80PortWrite *ptr) 
{ 
	FILE	*fp; 
 
/*	fp = fopen("C:\\TMP\\Z80.LOG", "at"); 
	fprintf(fp, "Write: %02X %02X\n", PortNo, Value); 
	fclose(fp);*/ 
 
	switch( PortNo ) 
	{ 
	case	0x4: 
		YM2610Write(0, Value); 
		break; 
	 
	case	0x5: 
		YM2610Write(1, Value); 
		break; 
	 
	case	0x6: 
		YM2610Write(2, Value); 
		break; 
	 
	case	0x7: 
		YM2610Write(3, Value); 
		break; 
	 
	case	0xC: 
		result_code = Value; 
		break; 
	} 
} 
 
//--------------------------------------------------------------------------- 
UINT16 PortRead(UINT16 PortNo, struct z80PortRead *ptr) 
{ 
	int	Value; 
	FILE	*fp; 
	 
	Value = PortRead2(PortNo, ptr); 
	 
/*	fp = fopen("C:\\TMP\\Z80.LOG", "at"); 
	fprintf(fp, "Read: %02X %02X\n", PortNo, Value); 
	fclose(fp);*/ 
	 
	return Value; 
} 
 
UINT16 PortRead2(UINT16 PortNo, struct z80PortRead *ptr) 
{ 
	switch( PortNo ) 
	{ 
	case	0x0: 
		pending_command = 0; 
		return sound_code; 
		break; 
	 
	case	0x4: 
		return rand()&0x83;//YM2610Read(0); 
		break; 
	 
	case	0x5: 
		return YM2610Read(1); 
		break; 
	 
	case	0x6: 
		return YM2610Read(2); 
		break; 
	}; 
	 
	return 0; 
}