diff --git a/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs b/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs
index d9560a2a9b..80f5cc85d5 100644
--- a/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs
@@ -133,7 +133,31 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 				srcdata = romfile;
 			else
 			{
-				// use corecomm for firmware requests
+				// use fromtend firmware interface
+
+				string firmwareID = null;
+				switch (filename)
+				{
+					case "CD_BIOS_EU": firmwareID = "CD_BIOS_EU"; break;
+					case "CD_BIOS_JP": firmwareID = "CD_BIOS_JP"; break;
+					case "CD_BIOS_US": firmwareID = "CD_BIOS_US"; break;
+					default:
+						break;
+				}
+				if (firmwareID != null)
+				{
+					srcdata = CoreComm.CoreFileProvider.GetFirmware("GEN", firmwareID, false);
+					if (srcdata == null)
+					{
+						Console.WriteLine("Frontend couldn't satisfy firmware request GEN:{0}", firmwareID);
+						return 0;
+					}
+				}
+				else
+				{
+					Console.WriteLine("Unrecognized firmware request {0}", filename);
+					return 0;
+				}
 			}
 
 			if (srcdata != null)
@@ -171,9 +195,7 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 				throw new Exception("gpgx_get_control() failed");
 
 			ControlConverter = new GPGXControlConverter(input);
-
 			ControllerDefinition = ControlConverter.ControllerDef;
-
 		}
 
 		#endregion
diff --git a/genplus-gx/cinterface/cinterface.c b/genplus-gx/cinterface/cinterface.c
index ebf813cb82..a999a047d9 100644
--- a/genplus-gx/cinterface/cinterface.c
+++ b/genplus-gx/cinterface/cinterface.c
@@ -13,15 +13,15 @@
 #include "md_ntsc.h"
 #include "sms_ntsc.h"
 
-char GG_ROM[256] = "GG_ROM";
-char AR_ROM[256] = "AR_ROM";
-char SK_ROM[256] = "SK_ROM";
-char SK_UPMEM[256] = "SK_UPMEM";
-char GG_BIOS[256] = "GG_BIOS";
-char CD_BIOS_EU[256] = "CD_BIOS_EU";
+char GG_ROM[256] = "GG_ROM"; // game genie rom
+char AR_ROM[256] = "AR_ROM"; // actin replay rom
+char SK_ROM[256] = "SK_ROM"; // sanic and knuckles
+char SK_UPMEM[256] = "SK_UPMEM"; // sanic and knuckles
+char GG_BIOS[256] = "GG_BIOS"; // game gear bootrom
+char CD_BIOS_EU[256] = "CD_BIOS_EU"; // cd bioses
 char CD_BIOS_US[256] = "CD_BIOS_US";
 char CD_BIOS_JP[256] = "CD_BIOS_JP";
-char MS_BIOS_US[256] = "MS_BIOS_US";
+char MS_BIOS_US[256] = "MS_BIOS_US"; // master system bioses
 char MS_BIOS_EU[256] = "MS_BIOS_EU";
 char MS_BIOS_JP[256] = "MS_BIOS_JP";