59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
|
|
/////////////////////////////////////////////////////////////////////
|
|
// Mapper 112
|
|
class NES_mapper112 : public NES_mapper
|
|
{
|
|
friend void adopt_MPRD(SnssMapperBlock* block, NES* nes);
|
|
friend int extract_MPRD(SnssMapperBlock* block, NES* nes);
|
|
|
|
public:
|
|
NES_mapper112(NES* parent) : NES_mapper(parent) {}
|
|
~NES_mapper112() {}
|
|
|
|
void Reset();
|
|
|
|
void MemoryWrite(uint32 addr, uint8 data);
|
|
|
|
void HSync(uint32 scanline);
|
|
|
|
protected:
|
|
uint8 regs[8];
|
|
uint32 prg0,prg1;
|
|
uint32 chr01,chr23,chr4,chr5,chr6,chr7;
|
|
uint32 chr_swap() { return regs[0] & 0x80; }
|
|
uint32 prg_swap() { return regs[0] & 0x40; }
|
|
uint8 irq_enabled; // IRQs enabled
|
|
uint8 irq_counter; // IRQ scanline counter, decreasing
|
|
uint8 irq_latch; // IRQ scanline counter latch
|
|
void MMC3_set_CPU_banks()
|
|
{
|
|
if(prg_swap())
|
|
{
|
|
set_CPU_banks(num_8k_ROM_banks-2,prg1,prg0,num_8k_ROM_banks-1);
|
|
}
|
|
else
|
|
{
|
|
set_CPU_banks(prg0,prg1,num_8k_ROM_banks-2,num_8k_ROM_banks-1);
|
|
}
|
|
}
|
|
void MMC3_set_PPU_banks()
|
|
{
|
|
if(num_1k_VROM_banks)
|
|
{
|
|
if(chr_swap())
|
|
{
|
|
set_PPU_banks(chr4,chr5,chr6,chr7,chr01,chr01+1,chr23,chr23+1);
|
|
}
|
|
else
|
|
{
|
|
set_PPU_banks(chr01,chr01+1,chr23,chr23+1,chr4,chr5,chr6,chr7);
|
|
}
|
|
}
|
|
}
|
|
void SNSS_fixup();
|
|
|
|
private:
|
|
};
|
|
/////////////////////////////////////////////////////////////////////
|
|
|