Mapper 30 support

Core/Core.vcxproj

@@ -723,6 +723,7 @@
     <ClInclude Include="Unl255in1.h" />
     <ClInclude Include="Unl43272.h" />
     <ClInclude Include="UnlPuzzle.h" />
+    <ClInclude Include="UnRom512.h" />
     <ClInclude Include="VideoHud.h" />
     <ClInclude Include="VideoRenderer.h" />
     <ClInclude Include="UnlPci556.h" />

Core/Core.vcxproj.filters

@@ -1147,6 +1147,9 @@
     <ClInclude Include="Cheapocabra.h">
       <Filter>Nes\Mappers</Filter>
     </ClInclude>
+    <ClInclude Include="UnRom512.h">
+      <Filter>Nes\Mappers</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="stdafx.cpp">

Core/MapperFactory.cpp

@@ -227,6 +227,7 @@
 #include "UNROM.h"
 #include "UnRom_94.h"
 #include "UnRom_180.h"
+#include "UnRom512.h"
 #include "VRC1.h"
 #include "VRC2_4.h"
 #include "VRC3.h"
@@ -247,7 +248,7 @@ Supported mappers:
 ??? : No known roms
 -----------------------------------------------------------------
 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10| 11| 12| 13| 14| 15|
-| 16| 17| 18| 19|...| 21| 22| 23| 24| 25| 26| 27| 28|   |   | 31|
+| 16| 17| 18| 19|...| 21| 22| 23| 24| 25| 26| 27| 28|   | 30| 31|
 | 32| 33| 34| 35| 36| 37| 38|---| 40| 41| 42| 43| 44| 45| 46| 47|
 | 48| 49| 50| 51| 52| 53| 54|???| 56| 57| 58|===| 60| 61| 62| 63|
 | 64| 65| 66| 67| 68| 69| 70| 71| 72| 73| 74| 75| 76| 77| 78| 79|
@@ -300,6 +301,7 @@ BaseMapper* MapperFactory::GetMapperFromID(RomData &romData)
 		case 26: return new VRC6(VRCVariant::VRC6b);
 		case 27: return new VRC2_4();
 		case 28: return new Action53();
+		case 30: return new UnRom512();
 		case 31: return new NsfCart31();
 		case 32: return new IremG101();
 		case 33: return new TaitoTc0190();

Core/RomData.h

@@ -198,7 +198,16 @@ struct NESHeader
 	MirroringType GetMirroringType()
 	{
 		if(Byte6 & 0x08) {
-			return MirroringType::FourScreens;
+			if(GetRomHeaderVersion() == RomHeaderVersion::Nes2_0) {
+				if(Byte6 & 0x01) {
+					//Based on proposal by rainwarrior/Myask: http://wiki.nesdev.com/w/index.php/Talk:NES_2.0
+					return MirroringType::ScreenAOnly;
+				} else {
+					return MirroringType::FourScreens;
+				}
+			} else {
+				return MirroringType::FourScreens;
+			}
 		} else {
 			return Byte6 & 0x01 ? MirroringType::Vertical : MirroringType::Horizontal;
 		}

Core/UnRom512.h

@@ -0,0 +1,52 @@
+#pragma once
+#include "stdafx.h"
+#include "BaseMapper.h"
+
+//Missing flashing support + only tested on 1 game demo
+class UnRom512 : public BaseMapper
+{
+private:
+	bool _oneScreenMirroring;
+
+protected:
+	virtual uint16_t GetPRGPageSize() override { return 0x4000; }
+	virtual uint16_t GetCHRPageSize() override { return 0x2000; }
+	virtual uint16_t RegisterStartAddress() override { return 0x8000; }
+	virtual uint16_t RegisterEndAddress() override { return 0xFFFF; }
+	virtual uint32_t GetChrRamSize() override { return 0x8000; }
+	virtual bool HasBusConflicts() override { return !HasBattery(); }
+
+	void InitMapper() override
+	{
+		SelectPRGPage(1, -1);
+		if(IsNes20()) {
+			_oneScreenMirroring = GetMirroringType() == MirroringType::ScreenAOnly;			
+		} else {
+			_oneScreenMirroring = GetMirroringType() == MirroringType::FourScreens;
+		}
+	}
+
+	void SetDefaultNametables(uint8_t* nametableA, uint8_t* nametableB) override
+	{
+		BaseMapper::SetDefaultNametables(nametableA, nametableB);
+		if(IsNes20() && !_oneScreenMirroring && _chrRam && _chrRamSize >= 0x8000) {
+			//InfiniteNesLives four-screen mirroring variation, last 8kb of CHR RAM is always mapped to 0x2000-0x3FFF (0x3EFF due to palette)
+			//This "breaks" the "UNROM512_4screen_test" test ROM - was the ROM actually tested on this board? Seems to contradict hardware specs
+			SetPpuMemoryMapping(0x2000, 0x3FFF, _chrRam + 0x6000);
+		}
+	}
+
+	void WriteRegister(uint16_t addr, uint8_t value) override
+	{
+		if(!HasBattery() || addr >= 0xC000) {
+			SelectPRGPage(0, value & 0x1F);
+			SelectCHRPage(0, (value >> 5) & 0x03);
+
+			if(_oneScreenMirroring) {
+				SetMirroringType(value & 0x80 ? MirroringType::ScreenBOnly : MirroringType::ScreenAOnly);
+			}
+		} else {
+			//Unimplemented (flash process)
+		}
+	}
+};