98 lines
2.1 KiB
C#
98 lines
2.1 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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public sealed class Mapper226 : NES.NESBoardBase
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{
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// http://wiki.nesdev.com/w/index.php/INES_Mapper_226
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public int prg_page;
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public bool prg_mode;
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private int prg_mask_32k;
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private int prg_mask_16k;
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private bool resetFlag = false;
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private bool resetSwitchMode = false;
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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int prg_mask_hack = 1;
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switch (Cart.board_type)
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{
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case "MAPPER226":
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break;
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case "UNIF_BMC-42in1ResetSwitch":
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resetSwitchMode = true;
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prg_mask_hack = 2;
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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_page = 0;
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prg_mode = false;
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prg_mask_32k = (Cart.prg_size / prg_mask_hack) / 32 - 1;
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prg_mask_16k = (Cart.prg_size / prg_mask_hack) / 16 - 1;
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return true;
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}
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public override void NESSoftReset()
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{
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resetFlag ^= true;
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prg_page = 0;
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prg_mode = false;
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base.NESSoftReset();
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}
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public override void SyncState(Serializer ser)
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{
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ser.Sync("prg_page", ref prg_page);
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ser.Sync("prg_mode", ref prg_mode);
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ser.Sync("resetFlag", ref resetFlag);
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ser.Sync("resetSwitchMode", ref resetSwitchMode);
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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 &= 1;
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if (addr == 0)
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{
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prg_page &= ~0x3F;
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prg_page |= ((value & 0x1F) + ((value & 0x80) >> 2));
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prg_mode = value.Bit(5);
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if (value.Bit(6))
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{
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SetMirrorType(EMirrorType.Vertical);
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}
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else
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{
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SetMirrorType(EMirrorType.Horizontal);
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}
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}
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else if (addr == 1)
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{
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prg_page &= ~0x40;
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prg_page |= ((value & 0x1) << 6);
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}
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}
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public override byte ReadPRG(int addr)
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{
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int baseAddr = resetSwitchMode && resetFlag ? 0x80000 : 0;
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if (prg_mode == false)
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{
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return ROM[baseAddr + (( ((prg_page >> 1) & prg_mask_32k) << 15) + (addr & 0x7FFF))];
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}
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else
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{
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return ROM[baseAddr + (((prg_page & prg_mask_16k) << 14) + (addr & 0x3FFF))];
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}
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}
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}
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}
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