diff --git a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
index 9aa566bc9d..bc04da0bdf 100644
--- a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
+++ b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
@@ -751,6 +751,7 @@
+
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_UNL-KOF97.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_UNL-KOF97.cs
new file mode 100644
index 0000000000..1c90947375
--- /dev/null
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_UNL-KOF97.cs
@@ -0,0 +1,72 @@
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+ // adapted from Nestopia src
+ public sealed class UNIF_UNL_KOF97 : MMC3Board_Base
+ {
+ public override bool Configure(NES.EDetectionOrigin origin)
+ {
+ switch (Cart.board_type)
+ {
+ case "UNIF_UNL-KOF97":
+ break;
+ default:
+ return false;
+ }
+
+ BaseSetup();
+ return true;
+ }
+
+ private byte Unscramble(byte data)
+ {
+ return (byte)
+ (
+ (data >> 1 & 0x01) |
+ (data >> 4 & 0x02) |
+ (data << 2 & 0x04) |
+ (data >> 0 & 0xD8) |
+ (data << 3 & 0x20)
+ );
+ }
+
+ public override void WritePRG(int addr, byte value)
+ {
+ if (addr < 0x1000) // 0x8000 - 0x8FFF
+ {
+ base.WritePRG(addr & 1, Unscramble(value));
+ }
+
+ else if (addr == 0x1000) // 9000 = 8001
+ {
+ base.WritePRG(1, Unscramble(value));
+ }
+
+ else if (addr == 0x2000) // A000 = 8000)
+ {
+ base.WritePRG(0, Unscramble(value));
+ }
+
+ else if (addr == 0x5000) // D000 = C001
+ {
+ base.WritePRG(0x4001, Unscramble(value));
+ }
+
+ else if (addr >= 0x6000 && addr < 0x7000) // 0xE0000 - 0xEFFF
+ {
+ base.WritePRG(addr & 1, Unscramble(value));
+ }
+
+ else if (addr == 0x7000) // F000
+ {
+ base.WritePRG(0x6001, Unscramble(value));
+ }
+
+ else
+ {
+ base.WritePRG(addr, value);
+ }
+ }
+ }
+}