76 lines
2.3 KiB
C#
76 lines
2.3 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper178 Education / WaiXing_FS305 //
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//////////////////////////////////////////////////////////////////////////
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using static VirtualNes.MMU;
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using BYTE = System.Byte;
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namespace VirtualNes.Core
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{
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public class Mapper178 : Mapper
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{
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BYTE[] reg = new byte[3];
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BYTE banknum;
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BYTE OP_rom;
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public Mapper178(NES parent) : base(parent)
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{
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}
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public override void Reset()
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{
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reg[0] = 0;
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reg[1] = 0;
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reg[2] = 0;
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banknum = 0;
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SetBank_CPU();
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OP_rom = 0;
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uint crc = nes.rom.GetPROM_CRC();
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if (crc == 0x925926BC //[ES-XXXX] Kou Dai Zuan Shi Zhi Chong Wu Xiao Jing Ling 2 (C)
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|| crc == 0xB0B13DBD) //[ES-XXXX] Chong Wu Fei Cui Zhi Chong Wu Xiao Jing Ling IV (C)
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{
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OP_rom = 1;
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}
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}
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//void Mapper178::WriteLow(WORD addr, BYTE data)
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public override void WriteLow(ushort addr, byte data)
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{
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// if( addr >= 0x4000 && addr <= 0x5FFF ) DEBUGOUT("Address=%04X Data=%02X\n", addr&0xFFFF, data&0xFF );
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if (addr == 0x4800)
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{
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if ((data & 0x01) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
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else SetVRAM_Mirror(VRAM_VMIRROR);
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}
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else if (addr == 0x4801)
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{
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reg[0] = (byte)((data >> 1) & 0x0F);
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if (OP_rom != 0) reg[0] = (byte)(data << 2);
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SetBank_CPU();
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}
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else if (addr == 0x4802)
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{
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reg[1] = (byte)(data << 2);
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if (OP_rom != 0) reg[1] = data;
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SetBank_CPU();
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}
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else if (addr == 0x4803)
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{
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//unknown
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reg[2] = data;
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}
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else if (addr >= 0x6000)
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{
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CPU_MEM_BANK[addr >> 13][addr & 0x1FFF] = data;
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}
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}
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void SetBank_CPU()
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{
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banknum = (byte)(reg[0] | reg[1]);
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// DEBUGOUT("Bank=%02X\n", banknum&0xFF );
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SetPROM_32K_Bank(banknum);
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}
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}
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}
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