44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
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/////////////////////////////////////////////////////////////////////
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// Mapper 4
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class NES_mapper4 : public NES_mapper
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{
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friend void adopt_MPRD(SnssMapperBlock* block, NES* nes);
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friend int extract_MPRD(SnssMapperBlock* block, NES* nes);
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public:
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NES_mapper4(NES* parent) : NES_mapper(parent) {}
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~NES_mapper4() {}
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void Reset();
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uint8 MemoryReadLow(uint32 addr);
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void MemoryWrite(uint32 addr, uint8 data);
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void HSync(uint32 scanline);
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protected:
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uint8 patch;
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uint8 regs[8];
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uint32 prg0,prg1;
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uint32 chr01,chr23,chr4,chr5,chr6,chr7;
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uint32 chr_swap() { return regs[0] & 0x80; }
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uint32 prg_swap() { return regs[0] & 0x40; }
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uint8 irq_enabled; // IRQs enabled
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uint8 irq_counter; // IRQ scanline counter, decreasing
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uint8 irq_latch; // IRQ scanline counter latch
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uint8 vs_index; // VS Atari RBI Baseball and VS TKO Boxing
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void MMC3_set_CPU_banks();
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void MMC3_set_PPU_banks();
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void SNSS_fixup(); // HACK HACK HACK HACK
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private:
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};
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/////////////////////////////////////////////////////////////////////
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