58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
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/////////////////////////////////////////////////////////////////////
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// Mapper 20
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class NES_mapper20 : 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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friend void adopt_ExMPRD(const char* fn, NES* nes);
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friend void extract_ExMPRD(const char* fn, NES* nes);
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public:
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NES_mapper20(NES* parent) : NES_mapper(parent) {}
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~NES_mapper20() {}
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void Reset();
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uint8 MemoryReadLow(uint32 addr);
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void MemoryWriteLow(uint32 addr, uint8 data);
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void MemoryWriteSaveRAM(uint32 addr, uint8 data);
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void MemoryWrite(uint32 addr, uint8 data);
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void HSync(uint32 scanline);
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void VSync();
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uint8 GetDiskSideNum() { return ROM_banks[4]; }
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uint8 GetDiskSide() { return current_side; }
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void SetDiskSide(uint8 side) { if(side <= ROM_banks[4]) {current_side = side; insert_wait = 0;} }
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uint8 GetDiskData(uint32 pt) { return disk[pt]; }
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void SetDiskData(uint32 pt, uint8 data) { disk[pt] = data; }
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uint8 DiskAccessed() { uint8 retval = access_flag; access_flag = 0; return retval; }
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protected:
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uint8 bios[0x2000];
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uint8 wram[0x8000];
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uint8 disk[0x40000];
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uint8 irq_enabled;
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uint32 irq_counter;
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uint32 irq_latch;
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uint8 irq_wait;
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uint8 disk_enabled;
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uint32 head_position;
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uint8 write_skip;
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uint8 disk_status;
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uint8 write_reg;
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uint8 current_side;
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uint8 access_flag;
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uint8 last_side;
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uint8 insert_wait;
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void SNSS_fixup();
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private:
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};
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/////////////////////////////////////////////////////////////////////
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