diff --git a/hash/bbcm_cart.xml b/hash/bbcm_cart.xml
index 7c42ea04a3a..c9a48d80930 100644
--- a/hash/bbcm_cart.xml
+++ b/hash/bbcm_cart.xml
@@ -15,9 +15,11 @@
 		<year>198?</year>
 		<publisher>Acorn</publisher>
 		<part name="cart" interface="bbcm_cart">
-			<dataarea name="rom" size="32768">
+			<dataarea name="uprom" size="16384">
 				<rom name="bbcmasterdemonstrationcartridge_1.rom" size="16384" crc="fc40c0e8" sha1="970ff4721e707f3c843f4fb09ce7f03e7ab265ae" offset="0" />
-				<rom name="bbcmasterdemonstrationcartridge_2.rom" size="16384" crc="2e73522d" sha1="ff39620d93b18fd36a4718474495211a46ef8184" offset="0x4000" />
+			</dataarea>
+			<dataarea name="lorom" size="16384">
+				<rom name="bbcmasterdemonstrationcartridge_2.rom" size="16384" crc="2e73522d" sha1="ff39620d93b18fd36a4718474495211a46ef8184" offset="0" />
 			</dataarea>
 		</part>
 	</software>
diff --git a/src/mess/machine/bbc.c b/src/mess/machine/bbc.c
index fc47168e996..27b342d9a95 100644
--- a/src/mess/machine/bbc.c
+++ b/src/mess/machine/bbc.c
@@ -2020,7 +2020,6 @@ DEVICE_IMAGE_LOAD_MEMBER( bbc_state, bbc_exp_rom )
 DEVICE_IMAGE_LOAD_MEMBER( bbc_state, bbcm_cart )
 {
 	UINT8 *RAM = m_region_user1->base();
-	UINT32 size;
 	int addr = 0, index = 0;
 
 	if (strcmp(image.device().tag(),":cart1") == 0)
@@ -2031,7 +2030,7 @@ DEVICE_IMAGE_LOAD_MEMBER( bbc_state, bbcm_cart )
 
 	if (image.software_entry() == NULL)
 	{
-		size = image.length();
+		UINT32 size = image.length();
 		logerror("loading rom %s, size:%.4x\n", image.filename(), size);
 
 		if (size != 0x8000)
@@ -2044,10 +2043,18 @@ DEVICE_IMAGE_LOAD_MEMBER( bbc_state, bbcm_cart )
 	}
 	else
 	{
-		size = image.get_software_region_length("rom");
-		logerror("loading rom %s, size:%.4x\n", image.filename(), size);
+		UINT32 size_lo = image.get_software_region_length("lorom");
+		UINT32 size_hi = image.get_software_region_length("uprom");
+		logerror("loading rom %s, size:%.4x\n", image.filename(), size_lo + size_hi);
 
-		memcpy(RAM + addr, image.get_software_region("rom"), size);
+		if (size_lo + size_hi != 0x8000)
+		{
+			image.seterror(IMAGE_ERROR_UNSUPPORTED, "Invalid rom file size");
+			return IMAGE_INIT_FAIL;
+		}
+
+		memcpy(RAM + addr + 0,       image.get_software_region("uprom"), size_hi);
+		memcpy(RAM + addr + size_hi, image.get_software_region("lorom"), size_lo);
 	}
 
 	return IMAGE_INIT_PASS;