From 8a48073a9bec26b7e912b0f9c5a0c535d7651b18 Mon Sep 17 00:00:00 2001
From: alyosha-tas <alexei.f.k@gmail.com>
Date: Sat, 2 Dec 2017 18:39:52 -0500
Subject: [PATCH] NESHawk: Mapper 63

---
 .../BizHawk.Emulation.Cores.csproj            |  1 +
 .../Consoles/Nintendo/NES/Boards/Mapper063.cs | 85 +++++++++++++++++++
 2 files changed, 86 insertions(+)
 create mode 100644 BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper063.cs

diff --git a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
index 5a536eb916..b665ac1d41 100644
--- a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
+++ b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
@@ -664,6 +664,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\BxROM.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Camerica.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\CamericaGoldenFive.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\Mapper063.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper043.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Cony.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\CoolBoy.cs" />
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper063.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper063.cs
new file mode 100644
index 0000000000..c808732674
--- /dev/null
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper063.cs
@@ -0,0 +1,85 @@
+using System;
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	public sealed class Mapper063 : NES.NESBoardBase
+	{
+		int prg0, prg1, prg2, prg3;
+		bool open_bus;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER063":
+					break;
+				default:
+					return false;
+			}
+
+			Cart.wram_size = 0;
+			// not sure on initial mirroring
+			SetMirrorType(EMirrorType.Vertical);
+
+			WritePRG(0, 0);
+			return true;
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			open_bus = ((addr & 0x0300) == 0x0300);
+
+			prg0 = (addr >> 1 & 0x1FC) | ((addr & 0x2) > 0 ? 0x0 : (addr >> 1 & 0x2) | 0x0);
+			prg1 = (addr >> 1 & 0x1FC) | ((addr & 0x2) > 0 ? 0x1 : (addr >> 1 & 0x2) | 0x1);
+			prg2 = (addr >> 1 & 0x1FC) | ((addr & 0x2) > 0 ? 0x2 : (addr >> 1 & 0x2) | 0x0);
+			prg3 = (addr & 0x800) > 0 ? ((addr & 0x07C) | ((addr & 0x06) > 0 ? 0x03 : 0x01)) : ((addr >> 1 & 0x01FC) | ((addr & 0x02) > 0 ? 0x03 : ((addr >> 1 & 0x02) | 0x01)));
+
+			SetMirrorType((addr & 0x01) > 0 ? EMirrorType.Horizontal : EMirrorType.Vertical);
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				if (open_bus)
+				{
+					return this.NES.DB;
+				}
+				else
+				{
+					return ROM[addr + prg0 * 0x2000];
+				}			
+			}
+			else if (addr < 0x4000)
+			{
+				if (open_bus)
+				{
+					return this.NES.DB;
+				}
+				else
+				{
+					return ROM[(addr - 0x2000) + prg1 * 0x2000];
+				}
+			}
+			else if (addr < 0x6000)
+			{
+				return ROM[(addr - 0x4000) + prg2 * 0x2000];
+			}
+			else
+			{
+				return ROM[(addr - 0x6000) + prg3 * 0x2000];
+			}
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("prg0", ref prg0);
+			ser.Sync("prg1", ref prg1);
+			ser.Sync("prg2", ref prg2);
+			ser.Sync("prg3", ref prg3);
+			ser.Sync("open_bus", ref open_bus);
+		}
+	}
+}