NES - Implement board HVC_UNROM_74HC08 (Mapper 180). Crazy Climber (J) now works. Testing is limited since it uses a crazy climber controller that we don't emulate

BizHawk.Emulation/BizHawk.Emulation.csproj

@@ -94,6 +94,7 @@
       <SubType>Code</SubType>
     </Compile>
     <Compile Include="Consoles\Nintendo\NES\Boards\HVC_UN1ROM.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\HVC_UNROM_74HC08.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\IC_74x377.cs">
       <SubType>Code</SubType>
     </Compile>

BizHawk.Emulation/Consoles/Nintendo/Docs/compatibility.txt

@@ -95,7 +95,7 @@ Open bus and bus conflict emulation is not considered complete or thorough in an
 159	Bandai		{{See 016}}
 164	Pirate		Junk
 165	Pirate		Junk
-180	Misc (J)	Nothing
+180	Misc (J)	Complete (but we don't implement the crazy climber controller) 
 182	MMC3Variant	Nothing
 184	Sunsoft-1	Complete
 185	Misc (J)	{{See 003}} This one will be an organizational pain as the games need additional data in gamedb

BizHawk.Emulation/Consoles/Nintendo/NES/Boards/HVC_UNROM_74HC08.cs

@@ -0,0 +1,67 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	class HVC_UNROM_74HC08 : NES.NESBoardBase
+	{
+		//Mapper 180
+		//Crazy Climber (J)
+
+		int prg_bank_mask_16k;
+		byte prg_bank_16k;
+		ByteBuffer prg_banks_16k = new ByteBuffer(2);
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "HVC-UNROM+74HC08":
+					break;
+				default:
+					return false;
+			}
+			SetMirrorType(Cart.pad_h, Cart.pad_v);
+			prg_bank_mask_16k = (Cart.prg_size / 16) - 1;
+			prg_banks_16k[0] = 0;
+			return true;
+		}
+
+		public override void Dispose()
+		{
+			prg_banks_16k.Dispose();
+			base.Dispose();
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("prg_bank_mask_16k", ref prg_bank_mask_16k);
+			ser.Sync("prg_bank_16k", ref prg_bank_16k);
+			ser.Sync("prg_banks_16k", ref prg_banks_16k);
+		}
+
+		void SyncPRG()
+		{
+			prg_banks_16k[1] = prg_bank_16k;
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			prg_bank_16k = (byte)(value & 7);
+			SyncPRG();
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			int bank_16k = addr >> 14;
+			int ofs = addr & ((1 << 14) - 1);
+			bank_16k = prg_banks_16k[bank_16k];
+			bank_16k &= prg_bank_mask_16k;
+			addr = (bank_16k << 14) | ofs;
+			return ROM[addr];
+		}
+	}
+}