99 lines
2.7 KiB
C#
99 lines
2.7 KiB
C#
using BizHawk.Common;
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using BizHawk.Common.NumberExtensions;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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// Ported from FCEUX
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public sealed class Mapper220 : NES.NESBoardBase
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{
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private ByteBuffer reg = new ByteBuffer(8);
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private int prg_mask_2k;
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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switch (Cart.board_type)
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{
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case "UNIF_UNL-KS7057":
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case "MAPPER220":
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break;
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default:
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return false;
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}
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prg_mask_2k = Cart.prg_size / 2 - 1;
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return true;
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}
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public override void Dispose()
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{
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reg.Dispose();
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base.Dispose();
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}
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public override void SyncState(Serializer ser)
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{
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ser.Sync("reg", ref reg);
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base.SyncState(ser);
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}
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public override void WritePRG(int addr, byte value)
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{
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addr += 0x8000;
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switch (addr & 0xF003)
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{
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case 0x8000:
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case 0x8001:
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case 0x8002:
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case 0x8003:
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case 0x9000:
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case 0x9001:
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case 0x9002:
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case 0x9003:
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SetMirrorType(value.Bit(0) ? EMirrorType.Vertical : EMirrorType.Horizontal);
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break;
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case 0xB000: reg[0] = (byte)((reg[0] & 0xF0) | (value & 0x0F)); break;
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case 0xB001: reg[0] = (byte)((reg[0] & 0x0F) | (value << 4)); break;
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case 0xB002: reg[1] = (byte)((reg[1] & 0xF0) | (value & 0x0F)); break;
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case 0xB003: reg[1] = (byte)((reg[1] & 0x0F) | (value << 4)); break;
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case 0xC000: reg[2] = (byte)((reg[2] & 0xF0) | (value & 0x0F)); break;
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case 0xC001: reg[2] = (byte)((reg[2] & 0x0F) | (value << 4)); break;
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case 0xC002: reg[3] = (byte)((reg[3] & 0xF0) | (value & 0x0F)); break;
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case 0xC003: reg[3] = (byte)((reg[3] & 0x0F) | (value << 4)); break;
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case 0xD000: reg[4] = (byte)((reg[4] & 0xF0) | (value & 0x0F)); break;
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case 0xD001: reg[4] = (byte)((reg[4] & 0x0F) | (value << 4)); break;
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case 0xD002: reg[5] = (byte)((reg[5] & 0xF0) | (value & 0x0F)); break;
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case 0xD003: reg[5] = (byte)((reg[5] & 0x0F) | (value << 4)); break;
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case 0xE000: reg[6] = (byte)((reg[6] & 0xF0) | (value & 0x0F)); break;
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case 0xE001: reg[6] = (byte)((reg[6] & 0x0F) | (value << 4)); break;
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case 0xE002: reg[7] = (byte)((reg[7] & 0xF0) | (value & 0x0F)); break;
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case 0xE003: reg[7] = (byte)((reg[7] & 0x0F) | (value << 4)); break;
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}
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}
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public override byte ReadWRAM(int addr)
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{
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int i = ((addr >> 11) & 3) + 4;
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int bank = reg[i] & prg_mask_2k;
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return ROM[(bank << 11) + (addr & 0x7FF)];
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}
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public override byte ReadPRG(int addr)
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{
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if (addr < 0x2000)
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{
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int i = (addr >> 11) & 3;
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int bank = reg[i] & prg_mask_2k;
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return ROM[(bank << 11) + (addr & 0x7FF)];
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}
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else if (addr < 0x4000)
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{
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return ROM[0x1A000 /* bank 0xd*/ + (addr & 0x1FFF)];
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}
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else
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{
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return ROM[0x1C000 /* bank 7*/ + (addr & 0x3FFF)];
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}
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}
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}
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}
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