From 8c4dba88f772357a5d907381cfd6ec1c3e28009d Mon Sep 17 00:00:00 2001
From: Souryo <mesenemu@gmail.com>
Date: Sat, 20 Aug 2016 13:29:27 -0400
Subject: [PATCH] Basic mapper 186 support (StudyBox - incomplete)

---
 Core/Core.vcxproj         |  1 +
 Core/Core.vcxproj.filters |  3 ++
 Core/MapperFactory.cpp    |  6 ++--
 Core/StudyBox.h           | 64 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 72 insertions(+), 2 deletions(-)
 create mode 100644 Core/StudyBox.h

diff --git a/Core/Core.vcxproj b/Core/Core.vcxproj
index 78f232f8..ea7e5de3 100644
--- a/Core/Core.vcxproj
+++ b/Core/Core.vcxproj
@@ -619,6 +619,7 @@
     <ClInclude Include="stdafx.h" />
     <ClInclude Include="StereoDelayFilter.h" />
     <ClInclude Include="StereoPanningFilter.h" />
+    <ClInclude Include="StudyBox.h" />
     <ClInclude Include="Subor166.h" />
     <ClInclude Include="Sunsoft184.h" />
     <ClInclude Include="Sunsoft3.h" />
diff --git a/Core/Core.vcxproj.filters b/Core/Core.vcxproj.filters
index 106a50ba..023f2edf 100644
--- a/Core/Core.vcxproj.filters
+++ b/Core/Core.vcxproj.filters
@@ -910,6 +910,9 @@
     <ClInclude Include="A12Watcher.h">
       <Filter>Nes\Mappers</Filter>
     </ClInclude>
+    <ClInclude Include="StudyBox.h">
+      <Filter>Nes\Mappers</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="stdafx.cpp">
diff --git a/Core/MapperFactory.cpp b/Core/MapperFactory.cpp
index 9de6b478..3e7cacdd 100644
--- a/Core/MapperFactory.cpp
+++ b/Core/MapperFactory.cpp
@@ -140,6 +140,7 @@
 #include "Sachen74LS374N.h"
 #include "Sachen74LS374NB.h"
 #include "Sachen8259.h"
+#include "StudyBox.h"
 #include "Subor166.h"
 #include "Sunsoft3.h"
 #include "Sunsoft4.h"
@@ -189,8 +190,8 @@ Supported mappers:
 |112|113|114|115|   |117|118|119|120|121|===|   |===|   |   |===|
 |===|===|===|===|132|133|   |===|136|137|138|139|140|141|142|143|
 |144|145|146|147|148|149|150|151|152|153|154|155|156|157|   |159|
-|   |===|   |163|164|165|166|167|168|===|170|171|172|173|===|175|
-|176|177|178|179|180|---|182|183|184|185|   |187|188|189|===|191|
+|---|===|   |163|164|165|166|167|168|===|170|171|172|173|===|175|
+|176|177|178|179|180|---|182|183|184|185|186|187|188|189|===|191|
 |192|193|194|195|   |197|   |   |200|201|202|203|204|205|206|207|
 |   |209|210|211|212|213|214|   |   |   |218|   |   |221|222|   |
 |   |225|226|227|228|229|230|231|232|233|234|235|   |===|238|===|
@@ -363,6 +364,7 @@ BaseMapper* MapperFactory::GetMapperFromID(RomData &romData)
 		case 183: return new Mapper183();
 		case 184: return new Sunsoft184();
 		case 185: return new CNROM(true);
+		case 186: return new StudyBox();
 		case 187: return new MMC3_187();
 		case 188: return new BandaiKaraoke();
 		case 189: return new MMC3_189();
diff --git a/Core/StudyBox.h b/Core/StudyBox.h
new file mode 100644
index 00000000..f2111426
--- /dev/null
+++ b/Core/StudyBox.h
@@ -0,0 +1,64 @@
+#pragma once
+#include "stdafx.h"
+#include "BaseMapper.h"
+
+class StudyBox : public BaseMapper
+{
+private:
+	uint8_t _prgRamReg;
+
+protected:
+	virtual uint16_t RegisterStartAddress() { return 0x4200; }
+	virtual uint16_t RegisterEndAddress() { return 0x43FF; }
+	virtual bool AllowRegisterRead() { return true; }
+
+	virtual uint16_t GetPRGPageSize() { return 0x4000; }
+	virtual uint16_t GetCHRPageSize() { return 0x2000; }
+	
+	virtual uint32_t GetSaveRamSize() { return 0xC00; }
+	virtual uint32_t GetSaveRamPageSize() { return 0xC00; }
+
+	virtual uint32_t GetWorkRamSize() { return 0x8000; }
+	virtual uint32_t GetWorkRamPageSize() { return 0x2000; }
+	
+	void InitMapper()
+	{
+		_prgRamReg = 0;
+
+		SelectPRGPage(1, 0);
+		SelectCHRPage(0, 0);
+		SetCpuMemoryMapping(0x4400, 0x4FFF, 0, PrgMemoryType::SaveRam);
+
+		UpdateState();
+	}
+
+	void StreamState(bool saving)
+	{
+		BaseMapper::StreamState(saving);
+		Stream(_prgRamReg);
+	}
+
+	uint8_t ReadRegister(uint16_t addr)
+	{
+		switch(addr) {
+			case 0x4200: case 0x4201: case 0x4203: return 0x00;
+			case 0x4202: return 0x40;
+			default: return 0xFF;
+		}
+	}
+
+	void UpdateState()
+	{
+		SetCpuMemoryMapping(0x6000, 0x7FFF, _prgRamReg, PrgMemoryType::WorkRam);
+	}
+
+	void WriteRegister(uint16_t addr, uint8_t value)
+	{
+		if(addr & 0x4203) {
+			switch(addr & 0x03) {
+				case 0: _prgRamReg = value >> 6; UpdateState(); break;
+				case 1: SelectPRGPage(0, value); break;
+			}
+		}
+	}
+};
\ No newline at end of file