Files
player/Project/Src/NES/mapper/118.cpp
2025-06-27 00:32:57 +08:00

228 lines
4.9 KiB
C++

/////////////////////////////////////////////////////////////////////
// Mapper 118
void NES_mapper118::Reset()
{
// clear registers FIRST!!!
for(int i = 0; i < 8; i++) regs[i] = 0x00;
// set CPU bank pointers
prg0 = 0;
prg1 = 1;
MMC3_set_CPU_banks();
// set VROM banks
if(num_1k_VROM_banks)
{
chr0 = 0;
chr1 = 1;
chr2 = 2;
chr3 = 3;
chr4 = 4;
chr5 = 5;
chr6 = 6;
chr7 = 7;
MMC3_set_PPU_banks();
}
else
{
chr0 = chr1 = chr2 = chr3 = chr4 = chr5 = chr6 = chr7 = 0;
}
irq_enabled = 0;
irq_counter = 0;
irq_latch = 0;
}
void NES_mapper118::MemoryWrite(uint32 addr, uint8 data)
{
switch(addr & 0xE001)
{
case 0x8000:
{
regs[0] = data;
MMC3_set_PPU_banks();
MMC3_set_CPU_banks();
}
break;
case 0x8001:
{
uint32 bank_num;
regs[1] = data;
bank_num = regs[1];
if((regs[0] & 0x07) < 6)
{
if(data & 0x80)
{
set_mirroring(0,0,0,0);
}
else
{
set_mirroring(1,1,1,1);
}
}
switch(regs[0] & 0x07)
{
case 0x00:
{
if(num_1k_VROM_banks)
{
bank_num &= 0xfe;
chr0 = bank_num;
chr1 = bank_num+1;
MMC3_set_PPU_banks();
}
}
break;
case 0x01:
{
if(num_1k_VROM_banks)
{
bank_num &= 0xfe;
chr2 = bank_num;
chr3 = bank_num+1;
MMC3_set_PPU_banks();
}
}
break;
case 0x02:
{
if(num_1k_VROM_banks)
{
chr4 = bank_num;
MMC3_set_PPU_banks();
}
}
break;
case 0x03:
{
if(num_1k_VROM_banks)
{
chr5 = bank_num;
MMC3_set_PPU_banks();
}
}
break;
case 0x04:
{
if(num_1k_VROM_banks)
{
chr6 = bank_num;
MMC3_set_PPU_banks();
}
}
break;
case 0x05:
{
if(num_1k_VROM_banks)
{
chr7 = bank_num;
MMC3_set_PPU_banks();
}
}
break;
case 0x06:
{
prg0 = bank_num;
MMC3_set_CPU_banks();
}
break;
case 0x07:
{
prg1 = bank_num;
MMC3_set_CPU_banks();
}
break;
}
}
break;
case 0xC000:
regs[4] = data;
irq_counter = regs[4];
break;
case 0xC001:
regs[5] = data;
irq_latch = regs[5];
break;
case 0xE000:
regs[6] = data;
irq_enabled = 0;
break;
case 0xE001:
regs[7] = data;
irq_enabled = 1;
break;
}
}
void NES_mapper118::HSync(uint32 scanline)
{
if(irq_enabled)
{
if((scanline >= 0) && (scanline <= 239))
{
if(parent_NES->ppu->spr_enabled() || parent_NES->ppu->bg_enabled())
{
if(!(irq_counter--))
{
irq_counter = irq_latch;
parent_NES->cpu->DoIRQ();
}
}
}
}
}
#define MAP118_ROM(ptr) (((ptr)-parent_NES->ROM->get_ROM_banks()) >> 13)
#define MAP118_VROM(ptr) (((ptr)-parent_NES->ROM->get_VROM_banks()) >> 10)
void NES_mapper118::SNSS_fixup()
{
NES_6502::Context context;
parent_NES->cpu->GetContext(&context);
prg0 = MAP118_ROM(context.mem_page[prg_swap() ? 6 : 4]);
prg1 = MAP118_ROM(context.mem_page[5]);
if(num_1k_VROM_banks)
{
if(chr_swap())
{
chr0 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[4]);
chr1 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[5]);
chr2 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[6]);
chr3 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[7]);
chr4 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[0]);
chr5 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[1]);
chr6 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[2]);
chr7 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[3]);
}
else
{
chr0 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[0]);
chr1 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[1]);
chr2 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[2]);
chr3 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[3]);
chr4 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[4]);
chr5 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[5]);
chr6 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[6]);
chr7 = MAP118_VROM(parent_NES->ppu->PPU_VRAM_banks[7]);
}
}
}
/////////////////////////////////////////////////////////////////////