AxibugEmuOnline/References/virtuanessrc097-master/NES/Mapper/Mapper083.cpp
2024-08-05 17:58:53 +08:00

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//////////////////////////////////////////////////////////////////////////
// Mapper083 Nintendo MMC3 //
//////////////////////////////////////////////////////////////////////////
void Mapper083::Reset()
{
for( INT i = 0; i < 3; i++ ) {
reg[i] = 0x00;
}
if( PROM_8K_SIZE >= 32 ) {
SetPROM_32K_Bank( 0, 1, 30, 31 );
reg[1] = 0x30;
} else {
SetPROM_32K_Bank( 0, 1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
}
if( VROM_1K_SIZE ) {
SetVROM_8K_Bank( 0 );
}
chr_bank = 0;
irq_enable = 0; // Disable
irq_counter = 0;
patch = 0;
if( nes->rom->GetPROM_CRC() == 0x1461D1F8 ) {
patch = 1;
}
}
BYTE Mapper083::ReadLow( WORD addr )
{
if( (addr&0x5100) == 0x5100 ) {
return reg[2];
} else if( addr >= 0x6000 ) {
return Mapper::ReadLow( addr );
}
return (BYTE)(addr>>8);
}
void Mapper083::WriteLow( WORD addr, BYTE data )
{
//DEBUGOUT( "MPRWR A=%04X D=%02X L=%3d CYC=%d\n", addr&0xFFFF, data&0xFF, nes->GetScanline(), nes->cpu->GetTotalCycles() );
switch( addr ) {
case 0x5101:
case 0x5102:
case 0x5103:
reg[2] = data;
break;
}
if( addr >= 0x6000 ) {
Mapper::WriteLow( addr, data );
}
}
void Mapper083::Write( WORD addr, BYTE data )
{
//DEBUGOUT( "MPRWR A=%04X D=%02X L=%3d CYC=%d\n", addr&0xFFFF, data&0xFF, nes->GetScanline(), nes->cpu->GetTotalCycles() );
switch( addr ) {
case 0x8000:
case 0xB000:
case 0xB0FF:
case 0xB1FF:
reg[0] = data;
chr_bank = (data&0x30)<<4;
SetPROM_16K_Bank( 4, data );
SetPROM_16K_Bank( 6, (data&0x30)|0x0F );
break;
case 0x8100:
reg[1] = data & 0x80;
data &= 0x03;
if( data == 0 ) SetVRAM_Mirror( VRAM_VMIRROR );
else if( data == 1 ) SetVRAM_Mirror( VRAM_HMIRROR );
else if( data == 2 ) SetVRAM_Mirror( VRAM_MIRROR4L );
else SetVRAM_Mirror( VRAM_MIRROR4H );
break;
case 0x8200:
irq_counter = (irq_counter&0xFF00)|(INT)data;
// nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
case 0x8201:
irq_counter = (irq_counter&0x00FF)|((INT)data<<8);
irq_enable = reg[1];
// nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
case 0x8300:
SetPROM_8K_Bank( 4, data );
break;
case 0x8301:
SetPROM_8K_Bank( 5, data );
break;
case 0x8302:
SetPROM_8K_Bank( 6, data );
break;
case 0x8310:
if( patch ) {
SetVROM_2K_Bank( 0, chr_bank|data );
} else {
SetVROM_1K_Bank( 0, chr_bank|data );
}
break;
case 0x8311:
if( patch ) {
SetVROM_2K_Bank( 2, chr_bank|data );
} else {
SetVROM_1K_Bank( 1, chr_bank|data );
}
break;
case 0x8312:
SetVROM_1K_Bank( 2, chr_bank|data );
break;
case 0x8313:
SetVROM_1K_Bank( 3, chr_bank|data );
break;
case 0x8314:
SetVROM_1K_Bank( 4, chr_bank|data );
break;
case 0x8315:
SetVROM_1K_Bank( 5, chr_bank|data );
break;
case 0x8316:
if( patch ) {
SetVROM_2K_Bank( 4, chr_bank|data );
} else {
SetVROM_1K_Bank( 6, chr_bank|data );
}
break;
case 0x8317:
if( patch ) {
SetVROM_2K_Bank( 6, chr_bank|data );
} else {
SetVROM_1K_Bank( 7, chr_bank|data );
}
break;
case 0x8318:
SetPROM_16K_Bank( 4, (reg[0]&0x30)|data );
break;
}
}
void Mapper083::HSync( INT scanline )
{
if( irq_enable ) {
if( irq_counter <= 113 ) {
// nes->cpu->IRQ();
irq_enable = 0;
// nes->cpu->SetIRQ( IRQ_MAPPER );
nes->cpu->SetIRQ( IRQ_TRIGGER );
} else {
irq_counter -= 113;
}
}
}
void Mapper083::SaveState( LPBYTE p )
{
p[0] = reg[0];
p[1] = reg[1];
p[2] = reg[2];
*(INT*)&p[3] = chr_bank;
p[7] = irq_enable;
*(INT*)&p[8] = irq_counter;
}
void Mapper083::LoadState( LPBYTE p )
{
reg[0] = p[0];
reg[1] = p[1];
reg[2] = p[2];
chr_bank = *(INT*)&p[3];
irq_enable = p[7];
irq_counter = *(INT*)&p[8];
}