Implement Mapper 190

Fixes #798

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper190.cs

@@ -0,0 +1,78 @@
+using BizHawk.Common;
+using BizHawk.Common.NumberExtensions;
+using System;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	// Magic Kid GooGoo
+	public sealed class Mapper190 : NES.NESBoardBase
+	{
+		//state
+		int prg_reg;
+		int[] chr_reg = new int[4];
+
+		public override void SyncState(Serializer ser)
+		{
+			ser.Sync("prg_reg", ref prg_reg);
+			ser.Sync("chr_reg", ref chr_reg, false);
+			base.SyncState(ser);
+		}
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER190":
+					AssertPrg(256); AssertChr(128); AssertVram(0); AssertWram(8);
+					break;
+				default:
+					return false;
+			}
+
+			prg_reg = 0;
+
+			SetMirrorType(EMirrorType.Vertical);
+
+			return true;
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			if (addr < 0x4000)
+			{
+				return ROM[(prg_reg * 0x4000) + addr];
+			}
+			else
+			{
+				return ROM[addr - 0x4000];
+			}
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				int bank = addr >> 11;
+				int ofs = addr & ((1 << 11) - 1);
+				bank = chr_reg[bank];
+				addr = (bank << 11) | ofs;
+				return VROM[addr];
+			}
+			else
+				return base.ReadPPU(addr);		
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			int addr_temp = addr & 0xF000;
+			switch (addr_temp)
+			{
+				case 0x0000: prg_reg = value & 0x7; break;
+				case 0x2000: chr_reg[addr & 3] = value & 0x3F; break;
+				case 0x4000: prg_reg = 8 | (value & 0x7); break;
+			}
+		}
+
+
+	}
+}