177 lines
5.4 KiB
C#
177 lines
5.4 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper069 SunSoft FME-7 //
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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 Mapper069 : Mapper
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{
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BYTE patch;
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BYTE reg;
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BYTE irq_enable;
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INT irq_counter;
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public Mapper069(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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irq_enable = 0;
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irq_counter = 0;
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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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nes.apu.SelectExSound(32);
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nes.SetIrqType(NES.IRQMETHOD.IRQ_CLOCK);
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patch = 0;
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uint crc = nes.rom.GetPROM_CRC();
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if (crc == 0xfeac6916)
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{ // Honoo no Toukyuuji - Dodge Danpei 2(J)
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// nes.SetIrqType( NES::IRQ_HSYNC );
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nes.SetRenderMethod(EnumRenderMethod.TILE_RENDER);
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}
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if (crc == 0xad28aef6)
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{ // Dynamite Batman(J) / Dynamite Batman - Return of the Joker(U)
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patch = 1;
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}
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}
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//void Mapper069::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 & 0xE000)
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{
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case 0x8000:
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reg = data;
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break;
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case 0xA000:
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switch (reg & 0x0F)
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{
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case 0x00:
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case 0x01:
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case 0x02:
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case 0x03:
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case 0x04:
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case 0x05:
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case 0x06:
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case 0x07:
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SetVROM_1K_Bank((byte)(reg & 0x07), data);
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break;
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case 0x08:
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if (patch == 0 && (data & 0x40) == 0)
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{
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SetPROM_8K_Bank(3, data);
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}
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break;
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case 0x09:
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SetPROM_8K_Bank(4, data);
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break;
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case 0x0A:
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SetPROM_8K_Bank(5, data);
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break;
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case 0x0B:
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SetPROM_8K_Bank(6, data);
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break;
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case 0x0C:
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data &= 0x03;
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if (data == 0) SetVRAM_Mirror(VRAM_VMIRROR);
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else if (data == 1) SetVRAM_Mirror(VRAM_HMIRROR);
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else if (data == 2) SetVRAM_Mirror(VRAM_MIRROR4L);
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else SetVRAM_Mirror(VRAM_MIRROR4H);
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break;
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case 0x0D:
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irq_enable = data;
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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break;
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case 0x0E:
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irq_counter = (irq_counter & 0xFF00) | data;
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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break;
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case 0x0F:
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irq_counter = (irq_counter & 0x00FF) | (data << 8);
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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break;
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}
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break;
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case 0xC000:
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case 0xE000:
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nes.apu.ExWrite(addr, data);
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break;
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}
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}
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//void Mapper069::Clock(INT cycles)
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public override void Clock(int cycles)
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{
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//if (irq_enable && (nes.GetIrqType() == NES::IRQ_CLOCK))
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if (irq_enable != 0 && (nes.GetIrqType() == (int)NES.IRQMETHOD.IRQ_HSYNC))
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{
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irq_counter -= cycles;
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if (irq_counter <= 0)
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{
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nes.cpu.SetIRQ(IRQ_MAPPER);
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irq_enable = 0;
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irq_counter = 0xFFFF;
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}
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}
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}
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//void Mapper069::HSync(INT scanline)
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public override void HSync(int scanline)
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{
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if (irq_enable != 0 && (nes.GetIrqType() == (int)NES.IRQMETHOD.IRQ_HSYNC))
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{
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irq_counter -= 114;
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if (irq_counter <= 0)
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{
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nes.cpu.SetIRQ(IRQ_MAPPER);
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irq_enable = 0;
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irq_counter = 0xFFFF;
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}
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}
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}
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//void Mapper069::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] = irq_enable;
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//*(INT*)&p[2] = irq_counter;
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}
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//void Mapper069::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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//irq_enable = p[1];
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//irq_counter = *(INT*)&p[2];
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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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