124 lines
3.5 KiB
C#
124 lines
3.5 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper035 //
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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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namespace VirtualNes.Core
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{
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public class Mapper035 : Mapper
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{
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BYTE[] reg = new byte[8];
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BYTE[] chr = new byte[8];
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ushort IRQCount, IRQa;
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public Mapper035(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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for (int i = 0; i < 8; i++)
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reg[i] = chr[i] = 0;
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IRQCount = IRQa = 0;
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//SetPROM_32K_Bank( 0, 1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
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Sync();
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//setprg8r(0x10,0x6000,0);
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SetPROM_8K_Bank(7, PROM_8K_SIZE - 1);
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}
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void Sync()
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{
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int i;
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SetPROM_8K_Bank(4, reg[0]);
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SetPROM_8K_Bank(5, reg[1]);
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SetPROM_8K_Bank(6, reg[2]);
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for (i = 0; i < 8; i++)
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SetVROM_1K_Bank((byte)i, chr[i]);
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SetVRAM_Mirror(reg[3] ^ 1);
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}
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//void Mapper035::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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if (addr >= 0x6000 && addr <= 0x7FFF)
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{
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XRAM[addr - 0x6000] = data;
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}
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else
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{
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base.WriteLow(addr, data);
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}
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}
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//BYTE Mapper035::ReadLow(WORD addr)
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public override byte ReadLow(ushort addr)
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{
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if (addr >= 0x6000 && addr <= 0x7FFF)
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{
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return XRAM[addr - 0x6000];
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}
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else
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{
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return base.ReadLow(addr);
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}
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}
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//void Mapper035::Write(WORD A, BYTE V)
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public override void Write(ushort A, byte V)
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{
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switch (A)
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{
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case 0x8000: reg[0] = V; break;
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case 0x8001: reg[1] = V; break;
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case 0x8002: reg[2] = V; break;
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case 0x9000: chr[0] = V; break;
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case 0x9001: chr[1] = V; break;
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case 0x9002: chr[2] = V; break;
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case 0x9003: chr[3] = V; break;
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case 0x9004: chr[4] = V; break;
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case 0x9005: chr[5] = V; break;
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case 0x9006: chr[6] = V; break;
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case 0x9007: chr[7] = V; break;
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case 0xC002:
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IRQa = 0;
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nes.cpu.ClrIRQ(IRQ_MAPPER); break;
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case 0xC005: IRQCount = V; break;
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case 0xC003: IRQa = 1; break;
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case 0xD001: reg[3] = V; break;
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}
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Sync();
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}
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//void Mapper035::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))
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{
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if (nes.ppu.IsDispON())
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{
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if (IRQa != 0)
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{
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IRQCount--;
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if (IRQCount == 0)
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{
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nes.cpu.SetIRQ(IRQ_MAPPER);
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IRQa = 0;
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}
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}
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}
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}
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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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