From 86b1ab5282b6b550cbc01491a7280ee219e90b7f Mon Sep 17 00:00:00 2001
From: scrimpeh <scrimpeh@users.noreply.github.com>
Date: Sat, 26 Sep 2015 15:33:56 +0200
Subject: [PATCH] NEShawk - Mapper197

---
 .../Nintendo/NES/Boards/MMC3_family/MMC3.cs   |  4 +-
 .../NES/Boards/MMC3_family/Mapper197.cs       | 64 ++++++++++++++++++-
 2 files changed, 64 insertions(+), 4 deletions(-)

diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/MMC3.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/MMC3.cs
index 60f49efc50..77265305e9 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/MMC3.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/MMC3.cs
@@ -52,7 +52,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 		}
 		bool oldIrqType;
 
-		public void Dispose()
+		public virtual void Dispose()
 		{
 			regs.Dispose();
 			chr_regs_1k.Dispose();
@@ -84,7 +84,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 			Sync();
 		}
 
-		public void Sync()
+		public virtual void Sync()
 		{
 			SyncIRQ();
 			if (prg_mode)
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper197.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper197.cs
index 24cb792223..1adfda1ca9 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper197.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper197.cs
@@ -1,4 +1,6 @@
-namespace BizHawk.Emulation.Cores.Nintendo.NES
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
 {
 	public sealed class Mapper197 : MMC3Board_Base
 	{
@@ -12,8 +14,66 @@
 				default:
 					return false;
 			}
-			BaseSetup();
+			int num_prg_banks = Cart.prg_size / 8;
+			prg_mask = num_prg_banks - 1;
+
+			int num_chr_banks = (Cart.chr_size);
+			chr_mask = num_chr_banks - 1;
+
+			mmc3 = new Mapper197_MMC3(this, num_prg_banks);
+			SetMirrorType(EMirrorType.Vertical);
 			return true;
 		}
 	}
+
+	public class Mapper197_MMC3 : MMC3
+	{
+		//This board has 512k CHR ROM, so the ByteBuffer in the base class deosn't suffice.
+		public IntBuffer chr_regs_1k_512 = new IntBuffer(8);
+
+		public Mapper197_MMC3(NES.NESBoardBase board, int num_prg_banks) : base(board, num_prg_banks)
+		{
+			
+		}
+
+		public override void Sync()
+		{
+			base.Sync();
+			int chr_left = regs[0] << 1;
+			int chr_right_upper = regs[2] << 1;
+			int chr_right_lower = regs[3] << 1;
+
+			for (var i = 0; i < 4; i++)
+			{
+				chr_regs_1k_512[i] = chr_left | i;
+			}
+
+			for (var i = 0; i < 2; i++)
+			{
+				chr_regs_1k_512[4 | i] = chr_right_upper | i;
+				chr_regs_1k_512[6 | i] = chr_right_lower | i;
+			}
+
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("chr_regs_1k_512", ref chr_regs_1k_512);
+		}
+
+		public override void Dispose()
+		{
+			base.Dispose();
+			chr_regs_1k_512.Dispose();
+		}
+
+		public override int Get_CHRBank_1K(int addr)
+		{
+			int bank_1k = addr >> 10;
+			bank_1k = chr_regs_1k_512[bank_1k];
+			return bank_1k;
+		}
+
+	}
 }