From a28ef8554946bffe21d5d70075456043496f8045 Mon Sep 17 00:00:00 2001
From: Souryo <mesenemu@gmail.com>
Date: Sun, 19 Jun 2016 08:28:13 -0400
Subject: [PATCH] Mapper 228 support (Action 52, Cheetahmen 2)

---
 Core/ActionEnterprises.h  | 43 +++++++++++++++++++++++++++++++++++++++
 Core/Core.vcxproj         |  1 +
 Core/Core.vcxproj.filters |  3 +++
 Core/MapperFactory.cpp    |  2 ++
 4 files changed, 49 insertions(+)
 create mode 100644 Core/ActionEnterprises.h

diff --git a/Core/ActionEnterprises.h b/Core/ActionEnterprises.h
new file mode 100644
index 00000000..d5f78699
--- /dev/null
+++ b/Core/ActionEnterprises.h
@@ -0,0 +1,43 @@
+#pragma once
+#include "stdafx.h"
+#include "BaseMapper.h"
+
+class ActionEnterprises : public BaseMapper
+{
+protected:
+	virtual uint16_t GetPRGPageSize() { return 0x4000; }
+	virtual uint16_t GetCHRPageSize() { return 0x2000; }
+
+	void InitMapper()
+	{
+		WriteRegister(0x8000, 0);
+	}
+
+	virtual void Reset(bool softReset)
+	{
+		WriteRegister(0x8000, 0);
+	}
+
+
+	void WriteRegister(uint16_t addr, uint8_t value)
+	{
+		uint8_t chipSelect = (addr >> 11) & 0x03;
+
+		if(chipSelect == 3) {
+			chipSelect = 2;
+		}
+
+		uint8_t prgPage = ((addr >> 6) & 0x1F) | (chipSelect << 5);
+		if(addr & 0x20) {
+			SelectPRGPage(0, prgPage);
+			SelectPRGPage(1, prgPage);
+		} else {
+			SelectPRGPage(0, prgPage & 0xFE);
+			SelectPRGPage(1, (prgPage & 0xFE) + 1);
+		}
+
+		SelectCHRPage(0, ((addr & 0x0F) << 2) | (value & 0x03));
+
+		SetMirroringType(addr & 0x2000 ? MirroringType::Horizontal : MirroringType::Vertical);
+	}
+};
diff --git a/Core/Core.vcxproj b/Core/Core.vcxproj
index 1a98e7db..bd055e8e 100644
--- a/Core/Core.vcxproj
+++ b/Core/Core.vcxproj
@@ -382,6 +382,7 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClInclude Include="ActionEnterprises.h" />
     <ClInclude Include="APU.h" />
     <ClInclude Include="ArkanoidController.h" />
     <ClInclude Include="AutoRomTest.h" />
diff --git a/Core/Core.vcxproj.filters b/Core/Core.vcxproj.filters
index 378810a0..45f3dfb7 100644
--- a/Core/Core.vcxproj.filters
+++ b/Core/Core.vcxproj.filters
@@ -649,6 +649,9 @@
     <ClInclude Include="Sachen_143.h">
       <Filter>Nes\Mappers\Sachen</Filter>
     </ClInclude>
+    <ClInclude Include="ActionEnterprises.h">
+      <Filter>Nes\Mappers</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="stdafx.cpp">
diff --git a/Core/MapperFactory.cpp b/Core/MapperFactory.cpp
index 820ad62e..74e234fc 100644
--- a/Core/MapperFactory.cpp
+++ b/Core/MapperFactory.cpp
@@ -2,6 +2,7 @@
 #include "MessageManager.h"
 #include "MapperFactory.h"
 #include "RomLoader.h"
+#include "ActionEnterprises.h"
 #include "AXROM.h"
 #include "Bandai74161_7432.h"
 #include "BandaiFcg.h"
@@ -236,6 +237,7 @@ BaseMapper* MapperFactory::GetMapperFromID(RomData &romData)
 		case 218: return new Mapper218();
 		case 225: return new Mapper225();
 		case 226: return new Mapper226();
+		case 228: return new ActionEnterprises();
 		case 230: return new Mapper230();
 		case 231: return new Mapper231();
 		case 232: return new BF9096();