63 lines
1.4 KiB
C#
63 lines
1.4 KiB
C#
using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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// Mapper 101:
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// bad dumps of Urusei - Lum no Wedding Bell (J)
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// good dumps of this rom are on Mapper087; only bad dumps with CHR banks out of order go here
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// nothing else uses this, other than hypothetical homebrews which might prefer it to CxROM
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// because of no bus conflicts
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public sealed class Mapper101 : NES.NESBoardBase
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{
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//configuration
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int chr_bank_mask_8k;
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//state
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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("chr_bank_8k", ref chr_bank_8k);
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}
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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//configure
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switch (Cart.board_type)
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{
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case "MAPPER101":
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AssertPrg(16, 32); AssertVram(0);
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Cart.wram_size = 0;
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Cart.wram_battery = false;
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AssertChr(8, 16, 32, 64, 128, 256, 512, 1024, 2048);
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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_bank_mask_8k = (Cart.chr_size / 8) - 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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{
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int ofs = addr & ((1 << 13) - 1);
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addr = (chr_bank_8k << 13) | ofs;
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return VROM[addr];
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}
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else return base.ReadPPU(addr);
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}
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public override void WriteWRAM(int addr, byte value)
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{
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chr_bank_8k = value & chr_bank_mask_8k;
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}
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}
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}
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