forked from sin365/AxibugEmuOnline
185 lines
5.0 KiB
C#
185 lines
5.0 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper114 //
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//////////////////////////////////////////////////////////////////////////
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using static VirtualNes.Core.CPU;
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using static VirtualNes.MMU;
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using BYTE = System.Byte;
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using INT = System.Int32;
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namespace VirtualNes.Core
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{
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public class Mapper114 : Mapper
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{
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BYTE reg_m, reg_a;
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BYTE[] reg_b = new BYTE[8];
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BYTE reg_c;
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BYTE irq_counter;
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BYTE irq_occur;
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public Mapper114(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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SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
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if (VROM_1K_SIZE != 0)
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{
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SetVROM_8K_Bank(0);
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}
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reg_a = reg_c = reg_m = 0;
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for (INT i = 0; i < 8; i++)
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{
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reg_b[i] = 0;
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}
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irq_counter = 0;
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irq_occur = 0;
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nes.SetRenderMethod(EnumRenderMethod.POST_RENDER);
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}
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//void Mapper114::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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reg_m = data;
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SetBank_CPU();
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}
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//void Mapper114::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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if (addr == 0xE003)
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{
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irq_counter = data;
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}
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else
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if (addr == 0xE002)
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{
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irq_occur = 0;
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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}
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else
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{
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switch (addr & 0xE000)
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{
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case 0x8000:
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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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case 0xA000:
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reg_c = 1;
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reg_a = data;
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break;
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case 0xC000:
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if (reg_c == 0)
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{
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break;
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}
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reg_b[reg_a & 0x07] = data;
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switch (reg_a & 0x07)
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{
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case 0:
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case 1:
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case 2:
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case 3:
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case 6:
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case 7:
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SetBank_PPU();
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break;
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case 4:
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case 5:
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SetBank_CPU();
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break;
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}
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reg_c = 0;
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break;
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}
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}
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}
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//void Mapper114::Clock(INT scanline)
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public override void Clock(int cycles)
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{
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// if( irq_occur ) {
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// nes.cpu.IRQ_NotPending();
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// }
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}
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//void Mapper114::HSync(INT scanline)
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public override void HSync(int scanline)
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{
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if ((scanline >= 0 && scanline <= 239) && nes.ppu.IsDispON())
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{
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if (irq_counter != 0)
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{
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irq_counter--;
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if (irq_counter == 0)
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{
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irq_occur = 0xFF;
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nes.cpu.SetIRQ(IRQ_MAPPER);
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}
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}
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}
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}
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void SetBank_CPU()
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{
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if ((reg_m & 0x80) != 0)
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{
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SetPROM_16K_Bank(4, reg_m & 0x1F);
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}
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else
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{
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SetPROM_8K_Bank(4, reg_b[4]);
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SetPROM_8K_Bank(5, reg_b[5]);
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}
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}
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void SetBank_PPU()
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{
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SetVROM_2K_Bank(0, reg_b[0] >> 1);
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SetVROM_2K_Bank(2, reg_b[2] >> 1);
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SetVROM_1K_Bank(4, reg_b[6]);
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SetVROM_1K_Bank(5, reg_b[1]);
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SetVROM_1K_Bank(6, reg_b[7]);
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SetVROM_1K_Bank(7, reg_b[3]);
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}
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//void Mapper114::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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for (int i = 0; i < 8; i++)
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{
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p[i] = reg_b[i];
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}
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p[8] = reg_m;
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p[9] = reg_a;
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p[10] = reg_c;
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p[11] = irq_counter;
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p[12] = irq_occur;
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}
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//void Mapper114::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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for (int i = 0; i < 8; i++)
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{
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reg_b[i] = p[i];
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}
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reg_m = p[8];
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reg_a = p[9];
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reg_c = p[10];
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irq_counter = p[11];
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irq_occur = p[12];
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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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