202 lines
6.0 KiB
C#
202 lines
6.0 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper105 Nintendo World Championship //
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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 Mapper105 : Mapper
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{
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BYTE init_state;
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BYTE write_count;
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BYTE bits;
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BYTE[] reg = new byte[4];
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BYTE irq_enable;
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INT irq_counter;
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public Mapper105(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);
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reg[0] = 0x0C;
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reg[1] = 0x00;
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reg[2] = 0x00;
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reg[3] = 0x10;
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bits = 0;
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write_count = 0;
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irq_counter = 0;
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irq_enable = 0;
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init_state = 0;
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}
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//void Mapper105::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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//WORD reg_num = (addr & 0x7FFF) >> 13;
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uint reg_num = (byte)((addr & 0x7FFF) >> 13);
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if ((data & 0x80) != 0)
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{
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bits = write_count = 0;
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if (reg_num == 0)
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{
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reg[reg_num] |= 0x0C;
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}
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}
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else
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{
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//bits |= (data & 1) << write_count++;
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bits |= (byte)((data & 1) << write_count++);
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if (write_count == 5)
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{
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reg[reg_num] = (byte)(bits & 0x1F);
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bits = write_count = 0;
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}
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}
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if ((reg[0] & 0x02) != 0)
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{
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if ((reg[0] & 0x01) != 0)
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{
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SetVRAM_Mirror(VRAM_HMIRROR);
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}
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else
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{
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SetVRAM_Mirror(VRAM_VMIRROR);
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}
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}
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else
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{
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if ((reg[0] & 0x01) != 0)
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{
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SetVRAM_Mirror(VRAM_MIRROR4H);
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}
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else
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{
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SetVRAM_Mirror(VRAM_MIRROR4L);
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}
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}
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switch (init_state)
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{
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case 0:
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case 1:
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init_state++;
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break;
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case 2:
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if ((reg[1] & 0x08) != 0)
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{
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if ((reg[0] & 0x08) != 0)
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{
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if ((reg[0] & 0x04) != 0)
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{
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SetPROM_8K_Bank(4, ((reg[3] & 0x07) * 2 + 16));
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SetPROM_8K_Bank(5, ((reg[3] & 0x07) * 2 + 17));
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SetPROM_8K_Bank(6, 30);
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SetPROM_8K_Bank(7, 31);
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}
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else
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{
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SetPROM_8K_Bank(4, 16);
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SetPROM_8K_Bank(5, 17);
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SetPROM_8K_Bank(6, ((reg[3] & 0x07) * 2 + 16));
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SetPROM_8K_Bank(7, ((reg[3] & 0x07) * 2 + 17));
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}
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}
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else
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{
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SetPROM_8K_Bank(4, ((reg[3] & 0x06) * 2 + 16));
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SetPROM_8K_Bank(5, ((reg[3] & 0x06) * 2 + 17));
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SetPROM_8K_Bank(6, ((reg[3] & 0x06) * 2 + 18));
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SetPROM_8K_Bank(7, ((reg[3] & 0x06) * 2 + 19));
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}
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}
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else
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{
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SetPROM_8K_Bank(4, ((reg[1] & 0x06) * 2 + 0));
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SetPROM_8K_Bank(5, ((reg[1] & 0x06) * 2 + 1));
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SetPROM_8K_Bank(6, ((reg[1] & 0x06) * 2 + 2));
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SetPROM_8K_Bank(7, ((reg[1] & 0x06) * 2 + 3));
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}
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if ((reg[1] & 0x10) != 0)
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{
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irq_counter = 0;
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irq_enable = 0;
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}
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else
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{
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irq_enable = 1;
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}
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// nes.cpu.ClrIRQ( IRQ_MAPPER );
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break;
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default:
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break;
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}
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}
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//void Mapper105::HSync(INT scanline)
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public override void HSync(int scanline)
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{
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if (scanline != 0)
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{
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if (irq_enable != 0)
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{
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irq_counter += 29781;
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}
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if (((irq_counter | 0x21FFFFFF) & 0x3E000000) == 0x3E000000)
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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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nes.cpu.SetIRQ(IRQ_TRIGGER2);
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}
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}
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}
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//void Mapper105::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 < 4; i++)
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//{
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// p[i] = reg[i];
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//}
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//p[8] = init_state;
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//p[9] = write_count;
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//p[10] = bits;
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//p[11] = irq_enable;
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//*((INT*)&p[12]) = irq_counter;
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}
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//void Mapper105::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 < 4; i++)
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//{
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// reg[i] = p[i];
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//}
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//init_state = p[8];
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//write_count = p[9];
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//bits = p[10];
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//irq_enable = p[11];
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//irq_counter = *((INT*)&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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