diff --git a/BizHawk.Emulation.Common/Interfaces/CoreComms.cs b/BizHawk.Emulation.Common/Interfaces/CoreComms.cs
index 0be7217eb8..9ef0b2ce72 100644
--- a/BizHawk.Emulation.Common/Interfaces/CoreComms.cs
+++ b/BizHawk.Emulation.Common/Interfaces/CoreComms.cs
@@ -15,8 +15,6 @@ namespace BizHawk.Emulation.Common
 		public bool GG_ShowClippedRegions;
 		public bool GG_HighlightActiveDisplayRegion;
 
-		public string PSX_FirmwaresPath;
-
 		public ICoreFileProvider CoreFileProvider;
 
 		public string SNES_ExePath;
diff --git a/BizHawk.Emulation.Cores/Consoles/Sony/PSX/Octoshock.cs b/BizHawk.Emulation.Cores/Consoles/Sony/PSX/Octoshock.cs
index 9e76b51b85..e59f99e1ef 100644
--- a/BizHawk.Emulation.Cores/Consoles/Sony/PSX/Octoshock.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Sony/PSX/Octoshock.cs
@@ -122,6 +122,8 @@ namespace BizHawk.Emulation.Cores.Sony.PSX
 
 		static IntPtr FopenCallbackProc(string fname, string mode)
 		{
+			throw new NotImplementedException("Antiquated CoreComm.PSX_FirmwaresPath must be replaced by CoreFileProvider");
+
 			// TODO - this should be using the CoreComm.CoreFileProvider interfaces
 
 			//TODO - probably this should never really fail. but for now, mednafen tries to create a bunch of junk, so just return failure for files which cant be opened
@@ -132,7 +134,7 @@ namespace BizHawk.Emulation.Cores.Sony.PSX
 				if (parts[0] != "$psx") throw new InvalidOperationException("Octoshock using some weird path we dont handle yet");
 				if (parts[1] == "firmware")
 				{
-					fname = Path.Combine(CurrOctoshockCore.CoreComm.PSX_FirmwaresPath, parts[2]);
+					//fname = Path.Combine(CurrOctoshockCore.CoreComm.PSX_FirmwaresPath, parts[2]);
 					if (!File.Exists(fname))
 					{
 						System.Windows.Forms.MessageBox.Show("the Octoshock core is referencing a firmware file which could not be found. Please make sure it's in your configured PSX firmwares folder. The referenced filename is: " + parts[1]);