AxibugEmuOnline/References/virtuanessrc097-master/NES/Mapper/Mapper160.cpp
2024-08-05 17:58:53 +08:00

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//////////////////////////////////////////////////////////////////////////
// Mapper160 PC-Aladdin //
//////////////////////////////////////////////////////////////////////////
void Mapper160::Reset()
{
SetPROM_32K_Bank( 0, 1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
irq_enable = 0;
irq_counter = 0;
irq_latch = 0;
refresh_type = 0;
}
void Mapper160::Write( WORD addr, BYTE data )
{
switch( addr ) {
case 0x8000:
SetPROM_8K_Bank( 4, data );
break;
case 0x8001:
SetPROM_8K_Bank( 5, data );
break;
case 0x8002:
SetPROM_8K_Bank( 6, data );
break;
case 0x9000:
if( data == 0x2B ) {
refresh_type = 1;
} else if( data == 0xA8 ) {
refresh_type = 2;
} else if( data == 0x1F ) {
refresh_type = 3;
} else if( data == 0x7C ) {
refresh_type = 4;
} else if( data == 0x18 ) {
refresh_type = 5;
} else if( data == 0x60 ) {
refresh_type = 6;
} else {
refresh_type = 0;
}
SetVROM_1K_Bank( 0, data );
break;
case 0x9001:
SetVROM_1K_Bank( 1, data );
break;
case 0x9002:
if( refresh_type == 2 && data != 0xE8 ) {
refresh_type = 0;
}
SetVROM_1K_Bank( 2, data );
break;
case 0x9003:
SetVROM_1K_Bank( 3, data );
break;
case 0x9004:
SetVROM_1K_Bank( 4, data );
break;
case 0x9005:
SetVROM_1K_Bank( 5, data );
break;
case 0x9006:
SetVROM_1K_Bank( 6, data );
break;
case 0x9007:
SetVROM_1K_Bank( 7, data );
break;
case 0xC000:
irq_counter = irq_latch;
irq_enable = irq_latch;
break;
case 0xC001:
irq_latch = data;
break;
case 0xC002:
irq_enable = 0;
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
case 0xC003:
irq_counter = data;
break;
}
}
void Mapper160::HSync( INT scanline )
{
if( scanline == 0 || scanline == 239 ) {
switch( refresh_type ) {
case 1:
SetVROM_8K_Bank(0x58,0x59,0x5A,0x5B,0x58,0x59,0x5A,0x5B);
break;
case 2:
SetVROM_8K_Bank(0x78,0x79,0x7A,0x7B,0x78,0x79,0x7A,0x7B);
break;
case 3:
SetVROM_8K_Bank(0x7C,0x7D,0x7E,0x7F,0x7C,0x7D,0x7E,0x7F);
break;
case 5:
SetVROM_8K_Bank(0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77);
break;
case 6:
SetVROM_8K_Bank(0x5C,0x5D,0x5E,0x5F,0x7C,0x7D,0x7E,0x7F);
break;
}
}
if( scanline == 64 ) {
if( refresh_type == 4 ) {
if( PPU_MEM_BANK[8][32*10+16] == 0x0A ) {
SetVROM_1K_Bank( 0, 0x68 );
SetVROM_1K_Bank( 1, 0x69 );
SetVROM_1K_Bank( 2, 0x6A );
SetVROM_1K_Bank( 3, 0x6B );
} else {
SetVROM_1K_Bank( 0, 0x6C );
SetVROM_1K_Bank( 1, 0x6D );
SetVROM_1K_Bank( 2, 0x6E );
SetVROM_1K_Bank( 3, 0x6F );
}
}
}
if( scanline == 128 ) {
if( refresh_type == 4 ) {
SetVROM_1K_Bank( 0, 0x68 );
SetVROM_1K_Bank( 1, 0x69 );
SetVROM_1K_Bank( 2, 0x6A );
SetVROM_1K_Bank( 3, 0x6B );
} else if( refresh_type == 5 ) {
SetVROM_8K_Bank(0x74,0x75,0x76,0x77,0x74,0x75,0x76,0x77);
}
}
if( scanline == 160 ) {
if( refresh_type == 6 ) {
SetVROM_8K_Bank(0x60,0x61,0x5E,0x5F,0x7C,0x7D,0x7E,0x7F);
}
}
if( irq_enable ) {
if( irq_counter == 0xFF ) {
// nes->cpu->IRQ_NotPending();
irq_enable = 0;
irq_counter = 0;
nes->cpu->SetIRQ( IRQ_MAPPER );
} else {
irq_counter++;
}
}
}
void Mapper160::SaveState( LPBYTE p )
{
p[0] = irq_enable;
p[1] = irq_counter;
p[2] = irq_latch;
p[3] = refresh_type;
}
void Mapper160::LoadState( LPBYTE p )
{
irq_enable = p[0];
irq_counter = p[1];
irq_latch = p[2];
refresh_type = p[3];
}