189 lines
5.1 KiB
C#
189 lines
5.1 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper065 Irem H3001 //
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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 Mapper065 : Mapper
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{
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BYTE patch;
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BYTE irq_enable;
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INT irq_counter;
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INT irq_latch;
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public Mapper065(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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patch = 0;
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// Kaiketsu Yanchamaru 3(J)
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if (nes.rom.GetPROM_CRC() == 0xe30b7f64)
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{
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patch = 1;
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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_8K_SIZE != 0)
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{
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SetVROM_8K_Bank(0);
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}
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irq_enable = 0;
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irq_counter = 0;
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}
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//void Mapper065::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)
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{
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case 0x8000:
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SetPROM_8K_Bank(4, data);
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break;
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case 0x9000:
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if (patch == 0)
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{
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if ((data & 0x40) != 0) SetVRAM_Mirror(VRAM_VMIRROR);
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else SetVRAM_Mirror(VRAM_HMIRROR);
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}
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break;
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case 0x9001:
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if (patch != 0)
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{
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if ((data & 0x80) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
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else SetVRAM_Mirror(VRAM_VMIRROR);
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}
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break;
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case 0x9003:
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if (patch == 0)
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{
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irq_enable = (byte)(data & 0x8);
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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}
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break;
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case 0x9004:
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if (patch == 0)
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{
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irq_counter = irq_latch;
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}
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break;
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case 0x9005:
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if (patch != 0)
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{
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irq_counter = (BYTE)(data << 1);
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irq_enable = data;
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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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irq_latch = (irq_latch & 0x00FF) | ((INT)data << 8);
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}
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break;
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case 0x9006:
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if (patch != 0)
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{
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irq_enable = 1;
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}
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else
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{
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irq_latch = (irq_latch & 0xFF00) | data;
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}
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break;
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case 0xB000:
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case 0xB001:
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case 0xB002:
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case 0xB003:
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case 0xB004:
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case 0xB005:
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case 0xB006:
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case 0xB007:
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SetVROM_1K_Bank((byte)(addr & 0x0007), data);
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break;
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case 0xA000:
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SetPROM_8K_Bank(5, data);
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break;
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case 0xC000:
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SetPROM_8K_Bank(6, data);
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break;
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}
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}
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//void Mapper065::HSync(INT scanline)
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public override void HSync(int scanline)
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{
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if (patch != 0)
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{
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if (irq_enable != 0)
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{
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if (irq_counter == 0)
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{
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// nes.cpu.IRQ_NotPending();
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nes.cpu.SetIRQ(IRQ_MAPPER);
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}
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else
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{
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irq_counter--;
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}
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}
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}
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}
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//void Mapper065::Clock(INT cycles)
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public override void Clock(int cycles)
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{
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if (patch == 0)
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{
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if (irq_enable != 0)
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{
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if (irq_counter <= 0)
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{
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// nes.cpu.IRQ_NotPending();
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nes.cpu.SetIRQ(IRQ_MAPPER);
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}
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else
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{
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irq_counter -= cycles;
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}
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}
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}
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}
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//void Mapper065::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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//p[0] = irq_enable;
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//*(INT*)&p[1] = irq_counter;
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//*(INT*)&p[5] = irq_latch;
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}
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//void Mapper065::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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//irq_enable = p[0];
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//irq_counter = *(INT*)&p[1];
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//irq_latch = *(INT*)&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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