130 lines
2.7 KiB
C#
130 lines
2.7 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper009 Nintendo MMC2 //
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//////////////////////////////////////////////////////////////////////////
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using static VirtualNes.MMU;
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using static VirtualNes.Core.CPU;
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using INT = System.Int32;
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using BYTE = System.Byte;
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//using Codice.CM.Client.Differences;
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namespace VirtualNes.Core
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{
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public class Mapper009 : Mapper
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{
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BYTE[] reg = new byte[4];
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BYTE latch_a, latch_b;
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public Mapper009(NES parent) : base(parent) { }
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public override void Reset()
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{
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SetPROM_32K_Bank(0, PROM_8K_SIZE - 3, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
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reg[0] = 0; reg[1] = 4;
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reg[2] = 0; reg[3] = 0;
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latch_a = 0xFE;
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latch_b = 0xFE;
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SetVROM_4K_Bank(0, 4);
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SetVROM_4K_Bank(4, 0);
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nes.ppu.SetChrLatchMode(true);
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}
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//void Mapper009::Write(WORD addr, BYTE data)
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public override void Write(ushort addr, byte data)
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{
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switch (addr & 0xF000)
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{
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case 0xA000:
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SetPROM_8K_Bank(4, data);
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break;
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case 0xB000:
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reg[0] = data;
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if (latch_a == 0xFD)
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{
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SetVROM_4K_Bank(0, reg[0]);
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}
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break;
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case 0xC000:
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reg[1] = data;
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if (latch_a == 0xFE)
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{
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SetVROM_4K_Bank(0, reg[1]);
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}
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break;
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case 0xD000:
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reg[2] = data;
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if (latch_b == 0xFD)
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{
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SetVROM_4K_Bank(4, reg[2]);
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}
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break;
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case 0xE000:
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reg[3] = data;
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if (latch_b == 0xFE)
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{
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SetVROM_4K_Bank(4, reg[3]);
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}
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break;
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case 0xF000:
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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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}
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//void Mapper009::PPU_ChrLatch(WORD addr)
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public override void PPU_ChrLatch(ushort addr)
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{
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if ((addr & 0x1FF0) == 0x0FD0 && latch_a != 0xFD)
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{
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latch_a = 0xFD;
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SetVROM_4K_Bank(0, reg[0]);
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}
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else if ((addr & 0x1FF0) == 0x0FE0 && latch_a != 0xFE)
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{
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latch_a = 0xFE;
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SetVROM_4K_Bank(0, reg[1]);
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}
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else if ((addr & 0x1FF0) == 0x1FD0 && latch_b != 0xFD)
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{
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latch_b = 0xFD;
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SetVROM_4K_Bank(4, reg[2]);
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}
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else if ((addr & 0x1FF0) == 0x1FE0 && latch_b != 0xFE)
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{
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latch_b = 0xFE;
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SetVROM_4K_Bank(4, reg[3]);
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}
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}
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//void Mapper009::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = reg[0];
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p[1] = reg[1];
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p[2] = reg[2];
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p[3] = reg[3];
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p[4] = latch_a;
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p[5] = latch_b;
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}
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//void Mapper009::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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reg[0] = p[0];
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reg[1] = p[1];
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reg[2] = p[2];
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reg[3] = p[3];
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latch_a = p[4];
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latch_b = p[5];
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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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