forked from sin365/AxibugEmuOnline
129 lines
3.7 KiB
C#
129 lines
3.7 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper109 SACHEN The Great Wall SA-019 //
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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 Mapper109 : Mapper
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{
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BYTE reg;
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BYTE chr0, chr1, chr2, chr3;
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BYTE chrmode0, chrmode1;
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public Mapper109(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;
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SetPROM_32K_Bank(0);
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chr0 = 0;
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chr1 = 0;
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chr2 = 0;
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chr3 = 0;
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SetBank_PPU();
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chrmode0 = 0;
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chrmode1 = 0;
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}
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//void Mapper109::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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switch (addr)
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{
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case 0x4100:
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reg = data;
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break;
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case 0x4101:
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switch (reg)
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{
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case 0:
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chr0 = data;
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SetBank_PPU();
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break;
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case 1:
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chr1 = data;
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SetBank_PPU();
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break;
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case 2:
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chr2 = data;
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SetBank_PPU();
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break;
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case 3:
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chr3 = data;
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SetBank_PPU();
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break;
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case 4:
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chrmode0 = (byte)(data & 0x01);
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SetBank_PPU();
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break;
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case 5:
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SetPROM_32K_Bank(data & 0x07);
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break;
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case 6:
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chrmode1 = (byte)(data & 0x07);
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SetBank_PPU();
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break;
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case 7:
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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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break;
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}
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break;
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}
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}
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void SetBank_PPU()
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{
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if (VROM_1K_SIZE != 0)
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{
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SetVROM_1K_Bank(0, chr0);
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SetVROM_1K_Bank(1, chr1 | ((chrmode1 << 3) & 0x8));
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SetVROM_1K_Bank(2, chr2 | ((chrmode1 << 2) & 0x8));
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SetVROM_1K_Bank(3, chr3 | ((chrmode1 << 1) & 0x8) | (chrmode0 * 0x10));
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SetVROM_1K_Bank(4, VROM_1K_SIZE - 4);
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SetVROM_1K_Bank(5, VROM_1K_SIZE - 3);
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SetVROM_1K_Bank(6, VROM_1K_SIZE - 2);
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SetVROM_1K_Bank(7, VROM_1K_SIZE - 1);
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}
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}
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//void Mapper109::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = reg;
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p[1] = chr0;
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p[2] = chr1;
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p[3] = chr2;
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p[4] = chr3;
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p[5] = chrmode0;
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p[6] = chrmode1;
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}
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//void Mapper109::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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reg = p[0];
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chr0 = p[1];
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chr1 = p[2];
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chr2 = p[3];
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chr3 = p[4];
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chrmode0 = p[5];
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chrmode1 = p[6];
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}
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public override bool IsStateSave()
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{
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return true;
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}
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}
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}
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