AxibugEmuOnline/virtuanessrc097-master/NES/Mapper/Mapper114.cpp

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//////////////////////////////////////////////////////////////////////////
// Mapper114 //
//////////////////////////////////////////////////////////////////////////
void Mapper114::Reset()
{
SetPROM_32K_Bank( 0, 1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
if( VROM_1K_SIZE ) {
SetVROM_8K_Bank( 0 );
}
reg_a = reg_c = reg_m = 0;
for( INT i = 0; i < 8; i++ ) {
reg_b[i] = 0;
}
irq_counter = 0;
irq_occur = 0;
nes->SetRenderMethod( NES::POST_RENDER );
}
void Mapper114::WriteLow( WORD addr, BYTE data )
{
reg_m = data;
SetBank_CPU();
}
void Mapper114::Write( WORD addr, BYTE data )
{
if( addr == 0xE003 ) {
irq_counter = data;
} else
if( addr == 0xE002 ) {
irq_occur = 0;
nes->cpu->ClrIRQ( IRQ_MAPPER );
} else {
switch( addr & 0xE000 ) {
case 0x8000:
if( data & 0x01 ) SetVRAM_Mirror( VRAM_HMIRROR );
else SetVRAM_Mirror( VRAM_VMIRROR );
break;
case 0xA000:
reg_c = 1;
reg_a = data;
break;
case 0xC000:
if( !reg_c ) {
break;
}
reg_b[reg_a&0x07] = data;
switch( reg_a & 0x07 ) {
case 0:
case 1:
case 2:
case 3:
case 6:
case 7:
SetBank_PPU();
break;
case 4:
case 5:
SetBank_CPU();
break;
}
reg_c = 0;
break;
}
}
}
void Mapper114::Clock( INT scanline )
{
// if( irq_occur ) {
// nes->cpu->IRQ_NotPending();
// }
}
void Mapper114::HSync( INT scanline )
{
if( (scanline >= 0 && scanline <= 239) && nes->ppu->IsDispON() ) {
if( irq_counter ) {
irq_counter--;
if( !irq_counter ) {
irq_occur = 0xFF;
nes->cpu->SetIRQ( IRQ_MAPPER );
}
}
}
}
void Mapper114::SetBank_CPU()
{
if( reg_m & 0x80 ) {
SetPROM_16K_Bank( 4, reg_m & 0x1F );
} else {
SetPROM_8K_Bank( 4, reg_b[4] );
SetPROM_8K_Bank( 5, reg_b[5] );
}
}
void Mapper114::SetBank_PPU()
{
SetVROM_2K_Bank( 0, reg_b[0]>>1 );
SetVROM_2K_Bank( 2, reg_b[2]>>1 );
SetVROM_1K_Bank( 4, reg_b[6] );
SetVROM_1K_Bank( 5, reg_b[1] );
SetVROM_1K_Bank( 6, reg_b[7] );
SetVROM_1K_Bank( 7, reg_b[3] );
}
void Mapper114::SaveState( LPBYTE p )
{
for( INT i = 0; i < 8; i++ ) {
p[i] = reg_b[i];
}
p[ 8] = reg_m;
p[ 9] = reg_a;
p[10] = reg_c;
p[11] = irq_counter;
p[12] = irq_occur;
}
void Mapper114::LoadState( LPBYTE p )
{
for( INT i = 0; i < 8; i++ ) {
reg_b[i] = p[i];
}
reg_m = p[ 8];
reg_a = p[ 9];
reg_c = p[10];
irq_counter = p[11];
irq_occur = p[12];
}