Files
player/Project/Src/NES/mapper/043.cpp
2025-06-27 00:32:57 +08:00

96 lines
1.5 KiB
C++

/////////////////////////////////////////////////////////////////////
// Mapper 43
void NES_mapper43::Reset()
{
set_CPU_banks(2,1,0,4,9);
set_PPU_banks(0,1,2,3,4,5,6,7);
//set_mirroring(NES_PPU::MIRROR_VERT);
irq_enabled = 1;
irq_counter = 0;
}
uint8 NES_mapper43::MemoryReadLow(uint32 addr)
{
if(0x5000 <= addr && addr < 0x6000)
{
return ROM_banks[0x2000*8 + 0x1000 + (addr - 0x5000)];
}
return (uint8)(addr >> 8);
}
void NES_mapper43::MemoryWriteLow(uint32 addr, uint8 data)
{
if((addr & 0xF0FF) == 0x4022)
{
switch(data & 0x07)
{
case 0x0:
case 0x2:
case 0x3:
case 0x4:
{
set_CPU_bank6(4);
}
break;
case 0x1:
{
set_CPU_bank6(3);
}
break;
case 0x5:
{
set_CPU_bank6(7);
}
break;
case 0x6:
{
set_CPU_bank6(5);
}
break;
case 0x7:
{
set_CPU_bank6(6);
}
break;
}
}
}
void NES_mapper43::MemoryWrite(uint32 addr, uint8 data)
{
if(addr == 0x8122)
{
if(data & 3)
{
irq_enabled = 1;
}
else
{
irq_counter = 0;
irq_enabled = 0;
}
}
}
void NES_mapper43::HSync(uint32 scanline)
{
if(irq_enabled)
{
irq_counter += 114;
if(irq_counter >= 4096)
{
irq_counter -= 4096;
parent_NES->cpu->DoIRQ();
}
}
}
/////////////////////////////////////////////////////////////////////