Mapper 50 support

Core/Core.vcxproj

@@ -444,6 +444,7 @@
     <ClInclude Include="Mapper230.h" />
     <ClInclude Include="Mapper241.h" />
     <ClInclude Include="Mapper40.h" />
+    <ClInclude Include="Mapper50.h" />
     <ClInclude Include="Mapper60.h" />
     <ClInclude Include="MMC1_155.h" />
     <ClInclude Include="MMC3_45.h" />

Core/Core.vcxproj.filters

@@ -700,6 +700,9 @@
     <ClInclude Include="Mapper40.h">
       <Filter>Nes\Mappers\Unnamed</Filter>
     </ClInclude>
+    <ClInclude Include="Mapper50.h">
+      <Filter>Nes\Mappers\Unnamed</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="stdafx.cpp">

Core/Mapper50.h

@@ -0,0 +1,66 @@
+#pragma once
+#include "stdafx.h"
+#include "BaseMapper.h"
+#include "CPU.h"
+
+class Mapper50 : public BaseMapper
+{
+private:
+	uint16_t _irqCounter;
+	bool _irqEnabled;
+
+protected:
+	virtual uint16_t RegisterStartAddress() { return 0x4020; }
+	virtual uint16_t RegisterEndAddress() { return 0x5FFF; }
+	virtual uint16_t GetPRGPageSize() { return 0x2000; }
+	virtual uint16_t GetCHRPageSize() { return 0x2000; }
+
+	void InitMapper()
+	{
+		_irqCounter = 0;
+		_irqEnabled = false;
+
+		SetCpuMemoryMapping(0x6000, 0x7FFF, 0x0F, PrgMemoryType::PrgRom);
+		SelectPRGPage(0, 0x08);
+		SelectPRGPage(1, 0x09);
+		SelectPRGPage(3, 0x0B);
+		SelectCHRPage(0, 0);
+	}
+
+	void StreamState(bool saving)
+	{
+		BaseMapper::StreamState(saving);
+
+		Stream(_irqCounter, _irqEnabled);
+	}
+
+	void ProcessCpuClock()
+	{
+		if(_irqEnabled) {
+			_irqCounter++;
+			if(_irqCounter == 0x1000) {
+				CPU::SetIRQSource(IRQSource::External);
+				_irqEnabled = false;
+			}
+		}
+	}
+
+	void WriteRegister(uint16_t addr, uint8_t value)
+	{
+		switch(addr & 0x4120) {
+			case 0x4020:
+				SelectPRGPage(2, (value & 0x08) | ((value & 0x01) << 2) | ((value & 0x06) >> 1));
+				break;
+
+			case 0x4120:
+				if(value & 0x01) {
+					_irqEnabled = true;
+				} else {
+					CPU::ClearIRQSource(IRQSource::External);
+					_irqCounter = 0;
+					_irqEnabled = false;
+				}
+				break;
+		}
+	}
+};

Core/MapperFactory.cpp

@@ -28,6 +28,7 @@
 #include "JalecoSs88006.h"
 #include "Mapper15.h"
 #include "Mapper40.h"
+#include "Mapper50.h"
 #include "Mapper57.h"
 #include "Mapper58.h"
 #include "Mapper60.h"
@@ -118,7 +119,7 @@ Supported mappers:  (... denotes bad mappers)
 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10| 11| 12| 13|   | 15|
 | 16| 17| 18| 19|...| 21| 22| 23| 24| 25| 26| 27|   |   |   | 31|
 | 32| 33| 34|   |   | 37| 38|   | 40|   |   |   | 44| 45|   | 47|
-|   | 49|   |   | 52|   |   |   |   | 57| 58|   | 60| 61| 62|   |
+|   | 49| 50|   | 52|   |   |   |   | 57| 58|   | 60| 61| 62|   |
 | 64| 65| 66| 67| 68| 69| 70| 71| 72| 73| 74| 75| 76| 77| 78| 79|
 | 80|   | 82|   |   | 85| 86| 87| 88| 89|   | 91| 92| 93| 94| 95|
 |   | 97|   | 99|   |101|   |   |   |   |   |107|   |   |   |   |
@@ -186,6 +187,7 @@ BaseMapper* MapperFactory::GetMapperFromID(RomData &romData)
 		case 45: return new MMC3_45();
 		case 47: return new MMC3_47();
 		case 49: return new MMC3_49();
+		case 50: return new Mapper50();
 		case 52: return new MMC3_52();
 		case 57: return new Mapper57();
 		case 58: return new Mapper58();