AxibugEmuOnline/References/VirtuaNESex_src_191105/NES/Mapper/Mapper052.cpp
2024-08-05 17:58:53 +08:00

168 lines
3.9 KiB
C++

//////////////////////////////////////////////////////////////////////////
// Mapper052 Konami VRC2 type B //
//////////////////////////////////////////////////////////////////////////
void Mapper052::Reset()
{
for( INT i = 0; i < 8; i++ ) {
reg[i] = i;
}
reg[8] = 0;
irq_enable = 0;
irq_counter = 0;
irq_latch = 0;
irq_clock = 0;
SetPROM_32K_Bank( 0, 1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
SetVROM_8K_Bank( 0 );
nes->SetRenderMethod( NES::PRE_ALL_RENDER );
// nes->SetRenderMethod( NES::POST_RENDER );
// nes->SetRenderMethod( NES::POST_ALL_RENDER );
}
void Mapper052::Write( WORD addr, BYTE data )
{
if(addr>=0xf000) DEBUGOUT( "MPRWR A=%04X D=%02X L=%3d CYC=%d\n", addr&0xFFFF, data&0xFF, nes->GetScanline(), nes->cpu->GetTotalCycles() );
if(addr>=0xf000) DEBUGOUT( "MPRWR A=%04X RAM=%02X L=%3d CYC=%d\n", addr&0xFFFF, RAM[0x1c0]&0xFF, nes->GetScanline(), nes->cpu->GetTotalCycles() );
switch( addr & 0xFFFF ) {
case 0x8000:
if(reg[8]) SetPROM_8K_Bank( 6, data );
else SetPROM_8K_Bank( 4, data );
break;
case 0x9002:
reg[8] = data & 0x02;
break;
case 0x9004:
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 0xA000:
SetPROM_8K_Bank( 5, data );
break;
case 0xB000:
reg[0] = (reg[0] & 0xF0) | (data & 0x0F);
SetVROM_1K_Bank( 0, reg[0] );
break;
case 0xB001:
reg[0] = (reg[0] & 0x0F) | ((data & 0x0F) << 4);
SetVROM_1K_Bank( 0, reg[0] );
break;
case 0xB002:
reg[1] = (reg[1] & 0xF0) | (data & 0x0F);
SetVROM_1K_Bank( 1, reg[1] );
break;
case 0xB003:
reg[1] = (reg[1] & 0x0F) | ((data & 0x0F) << 4);
SetVROM_1K_Bank( 1, reg[1] );
break;
case 0xC000:
reg[2] = (reg[2] & 0xF0) | (data & 0x0F);
SetVROM_1K_Bank( 2, reg[2] );
break;
case 0xC001:
reg[2] = (reg[2] & 0x0F) | ((data & 0x0F) << 4);
SetVROM_1K_Bank( 2, reg[2] );
break;
case 0xC002:
reg[3] = (reg[3] & 0xF0) | (data & 0x0F);
SetVROM_1K_Bank( 3, reg[3] );
break;
case 0xC003:
reg[3] = (reg[3] & 0x0F) | ((data & 0x0F) << 4);
SetVROM_1K_Bank( 3, reg[3] );
break;
case 0xD000:
reg[4] = (reg[4] & 0xF0) | (data & 0x0F);
SetVROM_1K_Bank( 4, reg[4] );
break;
case 0xD001:
reg[4] = (reg[4] & 0x0F) | ((data & 0x0F) << 4);
SetVROM_1K_Bank( 4, reg[4] );
break;
case 0xD002:
reg[5] = (reg[5] & 0xF0) | (data & 0x0F);
SetVROM_1K_Bank( 5, reg[5] );
break;
case 0xD003:
reg[5] = (reg[5] & 0x0F) | ((data & 0x0F) << 4);
SetVROM_1K_Bank( 5, reg[5] );
break;
case 0xE000:
reg[6] = (reg[6] & 0xF0) | (data & 0x0F);
SetVROM_1K_Bank( 6, reg[6] );
break;
case 0xE001:
reg[6] = (reg[6] & 0x0F) | ((data & 0x0F) << 4);
SetVROM_1K_Bank( 6, reg[6] );
break;
case 0xE002:
reg[7] = (reg[7] & 0xF0) | (data & 0x0F);
SetVROM_1K_Bank( 7, reg[7] );
break;
case 0xE003:
reg[7] = (reg[7] & 0x0F) | ((data & 0x0F) << 4);
SetVROM_1K_Bank( 7, reg[7] );
break;
case 0xF000:
break;
case 0xF004:
case 0xFF04:
RAM[0x7f8] = 1;
break;
case 0xF008:
case 0xFF08:
irq_enable = 1;
// irq_latch = ((RAM[0x7f8]*2)+0x11)^0xFF; //Akumajou Special - Boku Dracula-kun
irq_latch = ((RAM[0x1c0]*2)+0x11)^0xFF; //Teenage Mutant Ninja Turtles
irq_counter = irq_latch;
irq_clock = 0;
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
case 0xF00C:
irq_enable = 0;
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
}
}
void Mapper052::HSync( INT scanline )
{
//
}
void Mapper052::Clock( INT cycles )
{
if( irq_enable ) {
irq_clock += cycles*3;
while( irq_clock >= 341 ) {
irq_clock -= 341;
irq_counter++;
if( irq_counter == 0 ) {
irq_counter = irq_latch;
nes->cpu->SetIRQ( IRQ_MAPPER );
}
}
}
}
void Mapper052::SaveState( LPBYTE p )
{
//
}
void Mapper052::LoadState( LPBYTE p )
{
//
}