60 lines
1.3 KiB
C#
60 lines
1.3 KiB
C#
namespace BizHawk.Emulation.Consoles.Nintendo
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{
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// tetris (unl)
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// behaves identically to CNROM for the one board it is on, but supports more (64K prg, 64K chr)
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// http://kevtris.org/mappers/tengen/800008.html
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public sealed class TENGEN_800008 : NES.NESBoardBase
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{
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int prg_mask;
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int chr_mask;
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int prg;
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int chr;
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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 "TENGEN-800008":
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AssertPrg(32, 64);
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AssertChr(8, 16, 32, 64);
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AssertWram(0);
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AssertVram(0);
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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_mask = (Cart.prg_size / 32) - 1;
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chr_mask = (Cart.chr_size / 8) - 1;
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return true;
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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 = value >> 3 & prg_mask;
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chr = value & chr_mask;
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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 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 void SyncState(Serializer ser)
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{
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base.SyncState(ser);
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ser.Sync("prg", ref prg);
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ser.Sync("chr", ref chr);
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}
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}
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}
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