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VRC1 (mapper 75) support

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This commit is contained in:
Souryo 2015-12-30 20:59:02 -05:00
parent d943350386
commit c0a14b7886
4 changed files with 66 additions and 0 deletions
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1
Core/Core.vcxproj
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@ -386,6 +386,7 @@
</ClCompile>
<ClCompile Include="VideoDecoder.cpp" />
<ClCompile Include="VirtualController.cpp" />
<ClCompile Include="VRC1.h" />
</ItemGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
<ImportGroup Label="ExtensionTargets">

3
Core/Core.vcxproj.filters
View file

@ -376,5 +376,8 @@
<ClCompile Include="AutoRomTest.cpp">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="VRC1.h">
<Filter>Header Files\Mappers</Filter>
</ClCompile>
</ItemGroup>
</Project>

2
Core/MapperFactory.cpp
View file

@ -27,6 +27,7 @@
#include "TaitoX1005.h"
#include "UnlPci556.h"
#include "UNROM.h"
#include "VRC1.h"
#include "VRC2_4.h"
#include "BF909x.h"
@ -64,6 +65,7 @@ BaseMapper* MapperFactory::GetMapperFromID(uint8_t mapperID)
case 66: return new GxRom();
case 70: return new Bandai74161_7432(false);
case 71: return new BF909x();
case 75: return new VRC1();
case 79: return new Nina03_06();
case 80: return new TaitoX1005();
case 87: return new JalecoJfxx(false);

60
Core/VRC1.h Normal file
View file

@ -0,0 +1,60 @@
#pragma once
#include "stdafx.h"
#include "BaseMapper.h"
class VRC1 : public BaseMapper
{
private:
uint8_t _chrBanks[2];
void UpdateChrBanks()
{
SelectCHRPage(0, _chrBanks[0]);
SelectCHRPage(1, _chrBanks[1]);
}
protected:
virtual uint16_t GetPRGPageSize() { return 0x2000; }
virtual uint16_t GetCHRPageSize() { return 0x1000; }
void InitMapper()
{
SelectPRGPage(3, -1);
}
virtual void StreamState(bool saving)
{
BaseMapper::StreamState(saving);
StreamArray<uint8_t>(_chrBanks, 2);
}
void WriteRegister(uint16_t addr, uint8_t value)
{
switch(addr & 0xF000) {
case 0x8000: SelectPRGPage(0, value & 0x0F); break;
case 0x9000:
if(GetMirroringType() != MirroringType::FourScreens) {
//"The mirroring bit is ignored if the cartridge is wired for 4-screen VRAM, as is typical for Vs. System games using the VRC1."
SetMirroringType((value & 0x01) == 0x01 ? MirroringType::Horizontal : MirroringType::Vertical);
}
_chrBanks[0] = (_chrBanks[0] & 0x0F) | ((value & 0x02) << 3);
_chrBanks[1] = (_chrBanks[1] & 0x0F) | ((value & 0x04) << 2);
UpdateChrBanks();
break;
case 0xA000: SelectPRGPage(1, value & 0x0F); break;
case 0xC000: SelectPRGPage(2, value & 0x0F); break;
case 0xE000:
_chrBanks[0] = (_chrBanks[0] & 0x10) | (value & 0x0F);
UpdateChrBanks();
break;
case 0xF000:
_chrBanks[1] = (_chrBanks[1] & 0x10) | (value & 0x0F);
UpdateChrBanks();
break;
}
}
};