105 lines
2.1 KiB
C#
105 lines
2.1 KiB
C#
using BizHawk.Common;
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using BizHawk.Common.NumberExtensions;
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using System;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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// mapper036
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// Strike Wolf (MGC-014) [!].nes
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// Using https://wiki.nesdev.com/w/index.php/INES_Mapper_036
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public sealed class Mapper036 : NES.NESBoardBase
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{
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int chr;
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int prg;
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int chr_mask;
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int prg_mask;
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byte R;
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bool M;
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byte P;
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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 "MAPPER036":
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AssertVram(0);
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Cart.wram_size = 0; // AssertWram(0); // GoodNES good dump of Strike Wolf specifies 8kb of wram
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break;
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default:
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return false;
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}
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chr_mask = Cart.chr_size / 8 - 1;
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prg_mask = Cart.prg_size / 32 - 1;
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SetMirrorType(Cart.pad_h, Cart.pad_v);
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return true;
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}
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public override byte ReadPPU(int addr)
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{
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if (addr < 0x2000)
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return VROM[addr | chr << 13];
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else
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return base.ReadPPU(addr);
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}
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public override byte ReadPRG(int addr)
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{
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return ROM[addr | prg << 15];
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}
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public override void WritePRG(int addr, byte value)
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{
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// either hack emulation of a weird bus conflict, or crappy pirate safeguard
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prg = (R >> 4) & prg_mask;
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}
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public override byte ReadEXP(int addr)
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{
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return (byte)(R | (NES.DB & 0xCF));
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}
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public override void WriteEXP(int addr, byte value)
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{
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Console.WriteLine(addr);
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Console.WriteLine(value);
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if ((addr & 0xE200) == 0x200)
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{
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chr = value & 15 & chr_mask;
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}
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switch (addr & 0xE103)
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{
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case 0x100:
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if (!M)
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{
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R = P;
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}
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else
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{
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R++;
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R &= 0x30;
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}
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break;
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case 0x102:
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P = (byte)(value & 0x30);
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prg = (value >> 4) & prg_mask;
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break;
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case 0x103:
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M = value.Bit(4);
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break;
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}
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}
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public override void SyncState(Serializer ser)
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{
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base.SyncState(ser);
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ser.Sync("chr", ref chr);
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ser.Sync("prg", ref prg);
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ser.Sync("R", ref R);
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ser.Sync("M", ref M);
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ser.Sync("P", ref P);
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}
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}
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}
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