111 lines
3.5 KiB
C#
111 lines
3.5 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper135 SACHEN CHEN //
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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 Mapper135 : Mapper
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{
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BYTE cmd;
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BYTE chr0l, chr1l, chr0h, chr1h, chrch;
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public Mapper135(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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cmd = 0;
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chr0l = chr1l = chr0h = chr1h = chrch = 0;
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SetPROM_32K_Bank(0);
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SetBank_PPU();
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}
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//void Mapper135::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 & 0x4101)
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{
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case 0x4100:
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cmd = (byte)(data & 0x07);
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break;
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case 0x4101:
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switch (cmd)
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{
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case 0:
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chr0l = (byte)(data & 0x07);
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SetBank_PPU();
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break;
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case 1:
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chr0h = (byte)(data & 0x07);
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SetBank_PPU();
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break;
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case 2:
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chr1l = (byte)(data & 0x07);
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SetBank_PPU();
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break;
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case 3:
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chr1h = (byte)(data & 0x07);
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SetBank_PPU();
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break;
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case 4:
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chrch = (byte)(data & 0x07);
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SetBank_PPU();
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break;
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case 5:
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SetPROM_32K_Bank((byte)(data & 0x07));
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break;
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case 6:
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break;
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case 7:
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switch ((data >> 1) & 0x03)
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{
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case 0: SetVRAM_Mirror(VRAM_MIRROR4L); break;
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case 1: SetVRAM_Mirror(VRAM_HMIRROR); break;
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case 2: SetVRAM_Mirror(VRAM_VMIRROR); break;
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case 3: SetVRAM_Mirror(VRAM_MIRROR4L); break;
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}
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break;
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}
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break;
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}
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CPU_MEM_BANK[addr >> 13][addr & 0x1FFF] = data;
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}
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void SetBank_PPU()
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{
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SetVROM_2K_Bank(0, 0 | (chr0l << 1) | (chrch << 4));
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SetVROM_2K_Bank(2, 1 | (chr0h << 1) | (chrch << 4));
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SetVROM_2K_Bank(4, 0 | (chr1l << 1) | (chrch << 4));
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SetVROM_2K_Bank(6, 1 | (chr1h << 1) | (chrch << 4));
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}
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//void Mapper135::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = cmd;
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p[1] = chr0l;
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p[2] = chr0h;
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p[3] = chr1l;
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p[4] = chr1h;
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p[5] = chrch;
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}
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//void Mapper135::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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cmd = p[0];
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chr0l = p[1];
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chr0h = p[2];
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chr0l = p[3];
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chr0h = p[4];
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chrch = p[5];
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}
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}
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}
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