98 lines
2.0 KiB
C#
98 lines
2.0 KiB
C#
using BizHawk.Common;
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using BizHawk.Common.NumberExtensions;
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// http://wiki.nesdev.com/w/index.php/INES_Mapper_230
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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internal sealed class Mapper230 : NesBoardBase
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{
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//TODO: soft reset back to contra = fails
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public int prg_page;
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public bool prg_mode;
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public bool contra_mode;
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public int chip0_prg_bank_mask_16k = 0x07;
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public int chip1_prg_bank_mask_16k = 0x1F;
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public int chip1_offset = 0x20000;
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public override bool Configure(EDetectionOrigin origin)
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{
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switch (Cart.BoardType)
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{
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case "MAPPER230":
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break;
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default:
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return false;
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}
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contra_mode = true;
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SetMirrorType(EMirrorType.Vertical);
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return true;
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}
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public override void SyncState(Serializer ser)
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{
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ser.Sync(nameof(contra_mode), ref contra_mode);
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ser.Sync(nameof(prg_page), ref prg_page);
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ser.Sync(nameof(prg_mode), ref prg_mode);
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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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if (contra_mode)
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{
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prg_page = value & 0x07;
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}
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else
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{
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prg_page = value & 0x1F;
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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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}
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public override byte ReadPrg(int addr)
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{
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if (contra_mode)
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{
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if (addr < 0x4000)
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{
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return Rom[((prg_page & chip0_prg_bank_mask_16k) * 0x4000) + addr];
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}
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else
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{
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return Rom[(7 * 0x4000) + (addr & 0x3FFF)];
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}
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}
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else
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{
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if (prg_mode == false)
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{
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return Rom[((prg_page >> 1) * 0x8000) + addr + chip1_offset];
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}
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else
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{
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int page = prg_page + 8;
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return Rom[(page * 0x4000) + (addr & 0x03FFF)];
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}
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}
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}
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public override void NesSoftReset()
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{
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contra_mode ^= true;
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prg_page = 0;
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prg_mode = false;
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SetMirrorType(EMirrorType.Vertical);
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}
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}
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}
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