diff --git a/fxemu.cpp b/fxemu.cpp
index 4cea5d9d..dc7501aa 100644
--- a/fxemu.cpp
+++ b/fxemu.cpp
@@ -196,7 +196,7 @@ static void FxReset (struct FxInfo_s *psFxInfo)
 		else
 		{
 			b %= GSU.nRomBanks * 2;
-			GSU.apvRomBank[i] = &GSU.pvRom[(b << 16) + 0x200000];
+			GSU.apvRomBank[i] = &GSU.pvRom[(b << 16) + 0x800000];
 		}
 	}
 
diff --git a/memmap.cpp b/memmap.cpp
index f0ce96af..880e6338 100644
--- a/memmap.cpp
+++ b/memmap.cpp
@@ -1375,6 +1375,10 @@ bool8 CMemory::LoadROMInt (int32 ROMfillSize)
 	CalculatedSize = ((ROMfillSize + 0x1fff) / 0x2000) * 0x2000;
 
 	if (CalculatedSize > 0x400000 &&
+		(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x1320 && // exclude SuperFX
+		(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x1420 &&
+		(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x1520 &&
+		(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x1A20 &&
 		(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x3423 && // exclude SA-1
 		(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x3523 &&
 		(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x4332 && // exclude S-DD1
@@ -2858,24 +2862,58 @@ void CMemory::Map_SuperFXLoROMMap (void)
 	printf("Map_SuperFXLoROMMap\n");
 	map_System();
 
-	// Replicate the first 2Mb of the ROM at ROM + 2MB such that each 32K
+	// Replicate the first 2Mb of the ROM at ROM + 8MB such that each 32K
 	// block is repeated twice in each 64K block.
 	for (int c = 0; c < 64; c++)
 	{
-		memmove(&ROM[0x200000 + c * 0x10000], &ROM[c * 0x8000], 0x8000);
-		memmove(&ROM[0x208000 + c * 0x10000], &ROM[c * 0x8000], 0x8000);
+		memmove(&ROM[0x800000 + c * 0x10000], &ROM[c * 0x8000], 0x8000);
+		memmove(&ROM[0x808000 + c * 0x10000], &ROM[c * 0x8000], 0x8000);
 	}
 
-	map_lorom(0x00, 0x3f, 0x8000, 0xffff, CalculatedSize);
-	map_lorom(0x80, 0xbf, 0x8000, 0xffff, CalculatedSize);
+	// Check GSU revision (not 100% accurate but it works)
+	// GSU2
+	if (CalculatedSize > 0x400000)
+	{
+		map_lorom(0x00, 0x3f, 0x8000, 0xffff, 0x200000);
+		map_lorom_offset(0x80, 0xbf, 0x8000, 0xffff, 0x200000, 0x200000);
 
-	map_hirom_offset(0x40, 0x7f, 0x0000, 0xffff, CalculatedSize, 0);
-	map_hirom_offset(0xc0, 0xff, 0x0000, 0xffff, CalculatedSize, 0);
+		map_hirom_offset(0x40, 0x5f, 0x0000, 0xffff, 0x200000, 0);
+		map_hirom_offset(0xc0, 0xff, 0x0000, 0xffff, CalculatedSize - 0x400000, 0x400000);
 
-	map_space(0x00, 0x3f, 0x6000, 0x7fff, SRAM - 0x6000);
-	map_space(0x80, 0xbf, 0x6000, 0x7fff, SRAM - 0x6000);
-	map_space(0x70, 0x70, 0x0000, 0xffff, SRAM);
-	map_space(0x71, 0x71, 0x0000, 0xffff, SRAM + 0x10000);
+		map_space(0x00, 0x3f, 0x6000, 0x7fff, SRAM - 0x6000);
+		map_space(0x80, 0xbf, 0x6000, 0x7fff, SRAM - 0x6000);
+		map_space(0x70, 0x70, 0x0000, 0xffff, SRAM);
+		map_space(0x71, 0x71, 0x0000, 0xffff, SRAM + 0x10000);
+	}
+	else if (CalculatedSize > 0x200000)
+	{
+		map_lorom(0x00, 0x3f, 0x8000, 0xffff, 0x200000);
+		map_lorom_offset(0x80, 0xbf, 0x8000, 0xffff, CalculatedSize - 0x200000, 0x200000);
+
+		map_hirom_offset(0x40, 0x5f, 0x0000, 0xffff, 0x200000, 0);
+		map_hirom_offset(0xc0, 0xff, 0x0000, 0xffff, CalculatedSize - 0x200000, 0x200000);
+
+		map_space(0x00, 0x3f, 0x6000, 0x7fff, SRAM - 0x6000);
+		map_space(0x80, 0xbf, 0x6000, 0x7fff, SRAM - 0x6000);
+		map_space(0x70, 0x70, 0x0000, 0xffff, SRAM);
+		map_space(0x71, 0x71, 0x0000, 0xffff, SRAM + 0x10000);
+	}
+	// GSU1
+	else
+	{
+		map_lorom(0x00, 0x3f, 0x8000, 0xffff, CalculatedSize);
+		map_lorom(0x80, 0xbf, 0x8000, 0xffff, CalculatedSize);
+
+		map_hirom_offset(0x40, 0x5f, 0x0000, 0xffff, CalculatedSize, 0);
+		map_hirom_offset(0xc0, 0xdf, 0x0000, 0xffff, CalculatedSize, 0);
+
+		map_space(0x00, 0x3f, 0x6000, 0x7fff, SRAM - 0x6000);
+		map_space(0x80, 0xbf, 0x6000, 0x7fff, SRAM - 0x6000);
+		map_space(0x70, 0x70, 0x0000, 0xffff, SRAM);
+		map_space(0x71, 0x71, 0x0000, 0xffff, SRAM + 0x10000);
+		map_space(0xf0, 0xf0, 0x0000, 0xffff, SRAM);
+		map_space(0xf1, 0xf1, 0x0000, 0xffff, SRAM + 0x10000);
+	}
 
 	map_WRAM();
 
diff --git a/memmap.h b/memmap.h
index 218754fd..d0818559 100644
--- a/memmap.h
+++ b/memmap.h
@@ -17,7 +17,7 @@
 struct CMemory
 {
 	enum
-	{ MAX_ROM_SIZE = 0x800000 };
+	{ MAX_ROM_SIZE = 0xC00000 };
 
 	enum file_formats
 	{ FILE_ZIP, FILE_JMA, FILE_DEFAULT };