Files
player/Project/Src/NES/mapper/183.cpp
2025-06-27 00:32:57 +08:00

227 lines
4.0 KiB
C++

/////////////////////////////////////////////////////////////////////
// Mapper 183
void NES_mapper183::Reset()
{
// set CPU bank pointers
set_CPU_banks(0,1,num_8k_ROM_banks-2,num_8k_ROM_banks-1);
// set PPU bank pointers
set_PPU_banks(0,1,2,3,4,5,6,7);
for(uint8 i = 0; i < 8; i++)
{
regs[i] = i;
}
irq_enabled = 0;
irq_counter = 0;
}
void NES_mapper183::MemoryWrite(uint32 addr, uint8 data)
{
switch(addr)
{
case 0x8800:
{
set_CPU_bank4(data);
}
break;
case 0xA800:
{
set_CPU_bank5(data);
}
break;
case 0xA000:
{
set_CPU_bank6(data);
}
break;
case 0xB000:
{
regs[0] = (regs[0] & 0xf0) | (data & 0x0f);
set_PPU_bank0(regs[0]);
}
break;
case 0xB004:
{
regs[0] = (regs[0] & 0x0f) | ((data & 0x0f) << 4);
set_PPU_bank0(regs[0]);
}
break;
case 0xB008:
{
regs[1] = (regs[1] & 0xf0) | (data & 0x0f);
set_PPU_bank1(regs[1]);
}
break;
case 0xB00C:
{
regs[1] = (regs[1] & 0x0f) | ((data & 0x0f) << 4);
set_PPU_bank1(regs[1]);
}
break;
case 0xC000:
{
regs[2] = (regs[2] & 0xf0) | (data & 0x0f);
set_PPU_bank2(regs[2]);
}
break;
case 0xC004:
{
regs[2] = (regs[2] & 0x0f) | ((data & 0x0f) << 4);
set_PPU_bank2(regs[2]);
}
break;
case 0xC008:
{
regs[3] = (regs[3] & 0xf0) | (data & 0x0f);
set_PPU_bank3(regs[3]);
}
break;
case 0xC00C:
{
regs[3] = (regs[3] & 0x0f) | ((data & 0x0f) << 4);
set_PPU_bank3(regs[3]);
}
break;
case 0xD000:
{
regs[4] = (regs[4] & 0xf0) | (data & 0x0f);
set_PPU_bank4(regs[4]);
}
break;
case 0xD004:
{
regs[4] = (regs[4] & 0x0f) | ((data & 0x0f) << 4);
set_PPU_bank4(regs[4]);
}
break;
case 0xD008:
{
regs[5] = (regs[5] & 0xf0) | (data & 0x0f);
set_PPU_bank5(regs[5]);
}
break;
case 0xD00C:
{
regs[5] = (regs[5] & 0x0f) | ((data & 0x0f) << 4);
set_PPU_bank5(regs[5]);
}
break;
case 0xE000:
{
regs[6] = (regs[6] & 0xf0) | (data & 0x0f);
set_PPU_bank6(regs[6]);
}
break;
case 0xE004:
{
regs[6] = (regs[6] & 0x0f) | ((data & 0x0f) << 4);
set_PPU_bank6(regs[6]);
}
break;
case 0xE008:
{
regs[7] = (regs[7] & 0xf0) | (data & 0x0f);
set_PPU_bank7(regs[7]);
}
break;
case 0xE00C:
{
regs[7] = (regs[7] & 0x0f) | ((data & 0x0f) << 4);
set_PPU_bank7(regs[7]);
}
break;
case 0x9008:
{
if(data == 1)
{
for(uint8 i = 0; i < 8; i++)
{
regs[i] = i;
}
set_CPU_banks(0,1,num_8k_ROM_banks-2,num_8k_ROM_banks-1);
set_PPU_banks(0,1,2,3,4,5,6,7);
}
}
break;
case 0x9800:
{
if(data == 0)
{
set_mirroring(NES_PPU::MIRROR_VERT);
}
else if(data == 1)
{
set_mirroring(NES_PPU::MIRROR_HORIZ);
}
else if(data == 2)
{
set_mirroring(0,0,0,0);
}
else if(data == 3)
{
set_mirroring(1,1,1,1);
}
}
break;
case 0xF000:
{
irq_counter = (irq_counter & 0xFF00) | data;
}
break;
case 0xF004:
{
irq_counter = (irq_counter & 0x00FF) | (data << 8);
}
break;
case 0xF008:
{
irq_enabled = data;
}
break;
}
}
void NES_mapper183::HSync(uint32 scanline)
{
if(irq_enabled & 0x02)
{
if(irq_counter <= 113)
{
parent_NES->cpu->DoIRQ();
irq_counter = 0;
}
else
{
irq_counter -= 113;
}
}
}
/////////////////////////////////////////////////////////////////////