mapper114.c

一款游戏机的模拟器

#include	"..\DLL\d_iNES.h"
#include	"..\Hardware\h_MMC3.h"

static	struct
{
	u8 PRG;
	u8 Valid;
}	Mapper;

static	void	Sync (void)
{
	MMC3_SyncPRG(0x3F,0);
	MMC3_SyncCHR_ROM(0xFF,0);
	MMC3_SyncMirror();
	if (Mapper.PRG & 0x80)
		MP->SetPRG_ROM16(0x8,Mapper.PRG & 0xF);
}

static	void	__cdecl	SaveMI (Ar128 MI)
{
	u8 x = 0;
	MI[x++] = Mapper.PRG;
	MI[x++] = Mapper.Valid;
	x = MMC3_SaveMI(MI,x);
}
static	void	__cdecl	LoadMI (const Ar128 MI)
{
	u8 x = 0;
	Mapper.PRG = MI[x++];
	Mapper.Valid = MI[x++];
	x = MMC3_LoadMI(MI,x);
	Sync();
}

static	void	__cdecl	UnloadMapper (void)
{
	iNES_UnloadROM();
	MMC3_Destroy();
}

static	void	__cdecl	Write6 (int Bank, int Where, int What)
{
	switch (Where & 7)
	{
	case 0:	Mapper.PRG = What;	break;
	}
	Sync();
}

static	void	__cdecl	Write89 (int Bank, int Where, int What)
{
	MMC3_WriteAB(Bank,0,What);
}

static	void	__cdecl	WriteAB (int Bank, int Where, int What)
{
	unsigned char LUT[8] = {0,3,1,5,6,7,2,4};
		MMC3_Write89(Bank,0,(What & 0xC0) | LUT[What & 0x7]);
	Mapper.Valid = 1;
}

static	void	__cdecl	WriteCD (int Bank, int Where, int What)
{
	if (Mapper.Valid)
		MMC3_Write89(Bank,1,What);
	Mapper.Valid = 0;
}

static	void	__cdecl	WriteEF (int Bank, int Where, int What)
{
	if (What)
	{
		MMC3_WriteCD(Bank,0,What);
		MMC3_WriteEF(Bank,1,What);
	}
	else	MMC3_WriteEF(Bank,0,What);
}

static	void	__cdecl	InitMapper (const PMapperParam _MP, int IsHardReset)
{
	MP = _MP;
	iNES_InitROM();

	MMC3_Init(Sync);

	MP->SetWriteHandler(0x6,Write6);
	MP->SetWriteHandler(0x8,Write89);
	MP->SetWriteHandler(0x9,Write89);
	MP->SetWriteHandler(0xA,WriteAB);
	MP->SetWriteHandler(0xB,WriteAB);
	MP->SetWriteHandler(0xC,WriteCD);
	MP->SetWriteHandler(0xD,WriteCD);
	MP->SetWriteHandler(0xE,WriteEF);
	MP->SetWriteHandler(0xF,WriteEF);

	Mapper.PRG = 0x00;
	Mapper.Valid = 1;

	Sync();
}

CTMapperInfo	MapperInfo_114 =
{
	"Mapper 114",
	114,
	MS_Partial,
	8192,
	InitMapper,
	UnloadMapper,
	MMC3_HBlank,
	NULL,
	SaveMI,
	LoadMI,
	NULL,
	NULL
};