diff --git a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
index 0c26ffa910..2e39d7e125 100644
--- a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
+++ b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
@@ -533,6 +533,7 @@
+
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper147.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper147.cs
new file mode 100644
index 0000000000..99cea04bbd
--- /dev/null
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper147.cs
@@ -0,0 +1,76 @@
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+ // Challenge of the Dragon (Sachen) [!]
+ // Chinese KungFu (Sachen-JAP) [!]
+ public sealed class Mapper147 : NES.NESBoardBase
+ {
+ private int _chrBankMask_8k;
+ private int _prgBankMask_32k;
+
+ private int _chrRegister;
+
+ public override bool Configure(NES.EDetectionOrigin origin)
+ {
+ //configure
+ switch (Cart.board_type)
+ {
+ case "MAPPER147":
+ break;
+ default:
+ return false;
+ }
+
+ _chrBankMask_8k = Cart.chr_size / 8 - 1;
+ _prgBankMask_32k = Cart.prg_size / 32 - 1;
+
+ return true;
+ }
+
+ public override void WriteEXP(int addr, byte value)
+ {
+ if ((addr & 0x103) == 0x102)
+ {
+ _chrRegister = value;
+ }
+ else
+ {
+ base.WriteEXP(addr, value);
+ }
+ }
+
+ public override void WritePRG(int addr, byte value)
+ {
+ if ((addr & 0x103) == 0x102)
+ {
+ _chrRegister = value;
+ }
+ }
+
+ public override byte ReadPPU(int addr)
+ {
+ if (addr < 0x2000)
+ {
+ int bank = _chrRegister >> 3 & 0x0F;
+ bank &= _chrBankMask_8k;
+ return VROM[(bank * 0x2000) + (addr & 0x1FFF)];
+ }
+
+ return base.ReadPPU(addr);
+ }
+
+ public override byte ReadPRG(int addr)
+ {
+ int bank = ((_chrRegister & 0x80) >> 6) | ((_chrRegister >> 2) & 1);
+ bank &= _prgBankMask_32k;
+ return ROM[(bank * 0x8000) + (addr & 0x7FFF)];
+ }
+
+ public override void SyncState(Serializer ser)
+ {
+ base.SyncState(ser);
+ ser.Sync("chrRegister", ref _chrRegister);
+ }
+ }
+}