diff --git a/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs b/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs
index 19f9ea934c..ede92a3f23 100644
--- a/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs
@@ -47,6 +47,9 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 			// three or six button?
 			// http://www.sega-16.com/forum/showthread.php?4398-Forgotten-Worlds-giving-you-GAME-OVER-immediately-Fix-inside&highlight=forgotten%20worlds
 
+			//hack, don't use
+			//romfile = File.ReadAllBytes(@"D:\encodes\bizhawksrc\output\SANIC CD\PierSolar (E).bin");
+
 			try
 			{
 				this.SyncSettings = (GPGXSyncSettings)SyncSettings ?? GPGXSyncSettings.GetDefaults();
@@ -165,18 +168,26 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 				}
 				srcdata = romfile;
 			}
-			else if (filename == "PRIMARY_CD")
+			else if (filename == "PRIMARY_CD" || filename == "SECONDARY_CD")
 			{
-				if (CD == null)
+				if (filename == "PRIMARY_CD" && romfile != null)
 				{
-					Console.WriteLine("Couldn't satisfy firmware request PRIMARY_CD because none was provided.");
+					Console.WriteLine("Declined to satisfy firmware request PRIMARY_CD because PRIMARY_ROM was provided.");
 					return 0;
 				}
-				srcdata = GetCDData();
-				if (srcdata.Length != maxsize)
+				else
 				{
-					Console.WriteLine("Couldn't satisfy firmware request PRIMARY_CD because of struct size.");
-					return 0;
+					if (CD == null)
+					{
+						Console.WriteLine("Couldn't satisfy firmware request {0} because none was provided.", filename);
+						return 0;
+					}
+					srcdata = GetCDData();
+					if (srcdata.Length != maxsize)
+					{
+						Console.WriteLine("Couldn't satisfy firmware request {0} because of struct size.", filename);
+						return 0;
+					}
 				}
 			}
 			else
diff --git a/genplus-gx/core/cd_hw/cdd.c b/genplus-gx/core/cd_hw/cdd.c
index aefceddc48..2d70fd8925 100644
--- a/genplus-gx/core/cd_hw/cdd.c
+++ b/genplus-gx/core/cd_hw/cdd.c
@@ -128,7 +128,7 @@ typedef struct
 	void (*cdd_readcallback)(int lba, void *dest, int audio);
 } frontendcd_t;
 
-int cdd_load(char *header)
+int cdd_load(const char *key, char *header)
 {
 	frontendcd_t fecd;
 	char data[2048];
@@ -136,7 +136,7 @@ int cdd_load(char *header)
 
 
 	int bytes = sizeof(frontendcd_t);
-	if (load_archive("PRIMARY_CD", (unsigned char *)&fecd, bytes, NULL) != bytes)
+	if (load_archive(key, (unsigned char *)&fecd, bytes, NULL) != bytes)
 		return 0;
 
 	// look for valid header
diff --git a/genplus-gx/core/cd_hw/cdd.h b/genplus-gx/core/cd_hw/cdd.h
index 23792ec5ed..6cd17683bc 100644
--- a/genplus-gx/core/cd_hw/cdd.h
+++ b/genplus-gx/core/cd_hw/cdd.h
@@ -98,7 +98,7 @@ extern void cdd_init(blip_t* left, blip_t* right);
 extern void cdd_reset(void);
 extern int cdd_context_save(uint8 *state);
 extern int cdd_context_load(uint8 *state);
-extern int cdd_load(char *header);
+extern int cdd_load(const char *key, char *header);
 extern void cdd_unload(void);
 extern void cdd_read_data(uint8 *dst);
 extern void cdd_read_audio(unsigned int samples);
diff --git a/genplus-gx/core/loadrom.c b/genplus-gx/core/loadrom.c
index 7451a39ead..c570aaa739 100644
--- a/genplus-gx/core/loadrom.c
+++ b/genplus-gx/core/loadrom.c
@@ -541,7 +541,7 @@ int load_rom(const char *filename)
   }
 
   /* auto-detect CD image files */
-  size = cdd_load((char *)(cart.rom));
+  size = cdd_load("PRIMARY_CD", (char *)(cart.rom));
   if (size < 0)
   {
     /* error opening file */
@@ -731,7 +731,7 @@ int load_rom(const char *filename)
         /* automatically load associated .iso image */
 		// this will only possibly work if a CD and a ROM are provided at the same time, which the frontend
 		// has no provision for at the moment
-        if (cdd_load((char *)cdc.ram) <= 0)
+        if (cdd_load("SECONDARY_CD", (char *)cdc.ram) <= 0)
 		  // no load, so disable CD hardware
 		  system_hw = SYSTEM_MD;
       }
diff --git a/output/dll/libgenplusgx.dll b/output/dll/libgenplusgx.dll
index d3f183fe3b..0db2c9c9ee 100644
Binary files a/output/dll/libgenplusgx.dll and b/output/dll/libgenplusgx.dll differ