84 lines
1.8 KiB
C#
84 lines
1.8 KiB
C#
using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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//AKA half of mapper 034 (the other half is AVE_NINA_001 which is entirely different..)
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internal sealed class BxROM : NesBoardBase
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{
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//configuration
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int prg_bank_mask_32k;
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int chr_bank_mask_8k;
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//state
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int prg_bank_32k;
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int chr_bank_8k;
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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(nameof(prg_bank_32k), ref prg_bank_32k);
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ser.Sync(nameof(chr_bank_8k), ref chr_bank_8k);
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}
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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 "AVE-NINA-07": // wally bear and the gang
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// it's not the NINA_001 but something entirely different; actually a colordreams with VRAM
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// this actually works
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AssertPrg(32,128); AssertChr(0,16); AssertWram(0); AssertVram(0,8);
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break;
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case "IREM-BNROM": //Mashou (J).nes
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case "NES-BNROM": //Deadly Towers (U)
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AssertPrg(128,256); AssertChr(0); AssertWram(0,8); AssertVram(8);
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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_bank_mask_32k = Cart.PrgSize / 32 - 1;
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chr_bank_mask_8k = Cart.ChrSize / 8 - 1;
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SetMirrorType(Cart.PadH, Cart.PadV);
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return true;
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}
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public override byte ReadPrg(int addr)
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{
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addr |= (prg_bank_32k << 15);
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return Rom[addr];
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}
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public override void WritePrg(int addr, byte value)
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{
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value = HandleNormalPRGConflict(addr, value);
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prg_bank_32k = value & prg_bank_mask_32k;
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chr_bank_8k = ((value >> 4) & 0xF) & chr_bank_mask_8k;
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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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{
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if (Vram != null)
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{
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return Vram[addr];
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}
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else
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{
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return Vrom[addr | (chr_bank_8k << 13)];
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}
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}
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else
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{
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return base.ReadPpu(addr);
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}
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}
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}
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}
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