From 276b152fbcefdeddd6eac8fd71c8cabb1cc532ef Mon Sep 17 00:00:00 2001
From: Souryo <mesenemu@gmail.com>
Date: Sat, 23 Jul 2016 12:58:44 -0400
Subject: [PATCH] Mapper 197 support

---
 Core/Core.vcxproj         |  1 +
 Core/Core.vcxproj.filters |  3 +++
 Core/MMC3_197.h           | 23 +++++++++++++++++++++++
 Core/MapperFactory.cpp    |  4 +++-
 4 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 Core/MMC3_197.h

diff --git a/Core/Core.vcxproj b/Core/Core.vcxproj
index 04752c11..0b2bb2ff 100644
--- a/Core/Core.vcxproj
+++ b/Core/Core.vcxproj
@@ -466,6 +466,7 @@
     <ClInclude Include="MMC1_155.h" />
     <ClInclude Include="MMC3_165.h" />
     <ClInclude Include="MMC3_182.h" />
+    <ClInclude Include="MMC3_197.h" />
     <ClInclude Include="MMC3_245.h" />
     <ClInclude Include="MMC3_45.h" />
     <ClInclude Include="Mapper57.h" />
diff --git a/Core/Core.vcxproj.filters b/Core/Core.vcxproj.filters
index 5f205177..1e4817b3 100644
--- a/Core/Core.vcxproj.filters
+++ b/Core/Core.vcxproj.filters
@@ -802,6 +802,9 @@
     <ClInclude Include="Mapper234.h">
       <Filter>Nes\Mappers\Unnamed</Filter>
     </ClInclude>
+    <ClInclude Include="MMC3_197.h">
+      <Filter>Nes\Mappers\MMC</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="stdafx.cpp">
diff --git a/Core/MMC3_197.h b/Core/MMC3_197.h
new file mode 100644
index 00000000..93af5a14
--- /dev/null
+++ b/Core/MMC3_197.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include "stdafx.h"
+#include "MMC3.h"
+
+class MMC3_197 : public MMC3
+{
+protected:
+	virtual void UpdateChrMapping()
+	{
+		if(_chrMode == 0) {
+			SelectChrPage4x(0, _registers[0] << 1);
+
+			SelectChrPage2x(2, _registers[2] << 1);
+			SelectChrPage2x(3, _registers[3] << 1);
+		} else if(_chrMode == 1) {
+			SelectChrPage4x(0, _registers[2] << 1);
+
+			SelectChrPage2x(2, _registers[0] << 1);
+			SelectChrPage2x(3, _registers[0] << 1);
+		}
+	}
+};
\ No newline at end of file
diff --git a/Core/MapperFactory.cpp b/Core/MapperFactory.cpp
index 20952424..c79efea0 100644
--- a/Core/MapperFactory.cpp
+++ b/Core/MapperFactory.cpp
@@ -82,6 +82,7 @@
 #include "MMC3_165.h"
 #include "MMC3_182.h"
 #include "MMC3_189.h"
+#include "MMC3_197.h"
 #include "MMC3_205.h"
 #include "MMC3_245.h"
 #include "MMC3_ChrRam.h"
@@ -159,7 +160,7 @@ Supported mappers:
 |144|145|146|147|148|149|150|151|152|153|154|155|156|157|   |159|
 |   |   |   |163|164|165|166|167|   |   |170|171|172|173|   |175|
 |176|177|178|179|180|   |182|   |184|185|   |   |   |189|   |191|
-|192|193|194|195|   |   |   |   |200|201|202|203|   |205|206|207|
+|192|193|194|195|   |197|   |   |200|201|202|203|   |205|206|207|
 |   |209|210|211|   |   |   |   |   |   |218|   |   |   |   |   |
 |   |225|226|227|228|   |230|231|232|   |234|235|   |   |   |   |
 |240|241|242|243|   |245|246|   |   |   |   |   |252|   |   |   |
@@ -323,6 +324,7 @@ BaseMapper* MapperFactory::GetMapperFromID(RomData &romData)
 		case 193: return new NtdecTc112();
 		case 194: return new MMC3_ChrRam(0x00, 0x01, 2);
 		case 195: return new MMC3_ChrRam(0x00, 0x03, 4);
+		case 197: return new MMC3_197();
 		case 200: return new Mapper200();
 		case 201: return new Mapper201();
 		case 202: return new Mapper202();