diff --git a/src/mame/drivers/taitogn.c b/src/mame/drivers/taitogn.c
index 1bcfb51db56..29177478932 100644
--- a/src/mame/drivers/taitogn.c
+++ b/src/mame/drivers/taitogn.c
@@ -783,7 +783,7 @@ INPUT_PORTS_END
 		ROM_LOAD16_WORD_BIOS(1, "flashv2.u30", 0x000000, 0x200000, CRC(CAE462D3) SHA1(f1b10846a8423d9fe021191c5876190857c3d2a4) ) \
 	ROM_REGION32_LE( 0x80000,  "mn10200", 0) \
 	ROM_FILL( 0, 0x80000, 0xff) \
-	ROM_REGION32_LE( 0x600000, "zsg1", 0) \
+	ROM_REGION32_LE( 0x600000, "zsg2", 0) \
 	ROM_FILL( 0, 0x600000, 0xff)
 
 ROM_START( taitogn )
diff --git a/src/mame/drivers/zn.c b/src/mame/drivers/zn.c
index 524d26c1b44..638b7efca7d 100644
--- a/src/mame/drivers/zn.c
+++ b/src/mame/drivers/zn.c
@@ -3936,7 +3936,7 @@ ROM_START( ftimpcta )
 	ROM_REGION( 0x080000, "mn10200", 0 )
 	ROM_LOAD( "e25-10.14",    0x0000000, 0x080000, CRC(2b2ad1b1) SHA1(6d064d0b6805d43ce42929ac8f5645b56384f53c) )
 
-	ROM_REGION( 0x600000, "zsg1", 0 )
+	ROM_REGION( 0x600000, "zsg2", 0 )
 	ROM_LOAD( "e25-04.27",    0x0000000, 0x400000, CRC(09a66d35) SHA1(f0df24bc9bfc9eb0f5150dc035c19fc5b8a39bf9) )
 	ROM_LOAD( "e25-05.28",    0x0040000, 0x200000, CRC(3fb57636) SHA1(aa38bfac11ecf10fd55143cf4525a2a529be8bb6) )
 ROM_END
@@ -3954,7 +3954,7 @@ ROM_START( ftimpact )
 	ROM_REGION( 0x080000, "mn10200", 0 )
 	ROM_LOAD( "e25-10.14",    0x0000000, 0x080000, CRC(2b2ad1b1) SHA1(6d064d0b6805d43ce42929ac8f5645b56384f53c) )
 
-	ROM_REGION( 0x600000, "zsg1", 0 )
+	ROM_REGION( 0x600000, "zsg2", 0 )
 	ROM_LOAD( "e25-04.27",    0x0000000, 0x400000, CRC(09a66d35) SHA1(f0df24bc9bfc9eb0f5150dc035c19fc5b8a39bf9) )
 	ROM_LOAD( "e25-05.28",    0x0040000, 0x200000, CRC(3fb57636) SHA1(aa38bfac11ecf10fd55143cf4525a2a529be8bb6) )
 ROM_END
@@ -3972,7 +3972,7 @@ ROM_START( ftimpactu )
 	ROM_REGION( 0x080000, "mn10200", 0 )
 	ROM_LOAD( "e25-10.14",    0x0000000, 0x080000, CRC(2b2ad1b1) SHA1(6d064d0b6805d43ce42929ac8f5645b56384f53c) )
 
-	ROM_REGION( 0x600000, "zsg1", 0 )
+	ROM_REGION( 0x600000, "zsg2", 0 )
 	ROM_LOAD( "e25-04.27",    0x0000000, 0x400000, CRC(09a66d35) SHA1(f0df24bc9bfc9eb0f5150dc035c19fc5b8a39bf9) )
 	ROM_LOAD( "e25-05.28",    0x0040000, 0x200000, CRC(3fb57636) SHA1(aa38bfac11ecf10fd55143cf4525a2a529be8bb6) )
 ROM_END
@@ -3990,7 +3990,7 @@ ROM_START( ftimpactj )
 	ROM_REGION( 0x080000, "mn10200", 0 )
 	ROM_LOAD( "e25-10.14",    0x0000000, 0x080000, CRC(2b2ad1b1) SHA1(6d064d0b6805d43ce42929ac8f5645b56384f53c) )
 
-	ROM_REGION( 0x600000, "zsg1", 0 )
+	ROM_REGION( 0x600000, "zsg2", 0 )
 	ROM_LOAD( "e25-04.27",    0x0000000, 0x400000, CRC(09a66d35) SHA1(f0df24bc9bfc9eb0f5150dc035c19fc5b8a39bf9) )
 	ROM_LOAD( "e25-05.28",    0x0040000, 0x200000, CRC(3fb57636) SHA1(aa38bfac11ecf10fd55143cf4525a2a529be8bb6) )
 ROM_END
@@ -4008,7 +4008,7 @@ ROM_START( gdarius )
 	ROM_REGION( 0x080000, "mn10200", 0 )
 	ROM_LOAD( "e39-07.14",    0x0000000, 0x080000, CRC(2252c7c1) SHA1(92b9908e0d87cad6587f1acc0eef69eaae8c6a98) )
 
-	ROM_REGION( 0x400000, "zsg1", 0 )
+	ROM_REGION( 0x400000, "zsg2", 0 )
 	ROM_LOAD( "e39-04.27",    0x0000000, 0x400000, CRC(6ee35e68) SHA1(fdfe63203d8cecf84cb869039fb893d5b63cdd67) )
 ROM_END
 
@@ -4025,7 +4025,7 @@ ROM_START( gdariusb )
 	ROM_REGION( 0x080000, "mn10200", 0 )
 	ROM_LOAD( "e39-07.14",    0x0000000, 0x080000, CRC(2252c7c1) SHA1(92b9908e0d87cad6587f1acc0eef69eaae8c6a98) )
 
-	ROM_REGION( 0x400000, "zsg1", 0 )
+	ROM_REGION( 0x400000, "zsg2", 0 )
 	ROM_LOAD( "e39-04.27",    0x0000000, 0x400000, CRC(6ee35e68) SHA1(fdfe63203d8cecf84cb869039fb893d5b63cdd67) )
 ROM_END
 
@@ -4042,7 +4042,7 @@ ROM_START( gdarius2 )
 	ROM_REGION( 0x080000, "mn10200", 0 )
 	ROM_LOAD( "e39-07.14",    0x0000000, 0x080000, CRC(2252c7c1) SHA1(92b9908e0d87cad6587f1acc0eef69eaae8c6a98) )
 
-	ROM_REGION( 0x400000, "zsg1", 0 )
+	ROM_REGION( 0x400000, "zsg2", 0 )
 	ROM_LOAD( "e39-04.27",    0x0000000, 0x400000, CRC(6ee35e68) SHA1(fdfe63203d8cecf84cb869039fb893d5b63cdd67) )
 ROM_END
 
@@ -4150,7 +4150,7 @@ ROM_START( raystorm )
 	ROM_REGION16_LE( 0x080000, "mn10200", 0 )
 	ROM_LOAD( "e24-09.14",    0x0000000, 0x080000, CRC(808589e1) SHA1(46ada4c6d68c2462186a0b962abb435ee740c0ba) )
 
-	ROM_REGION( 0x400000, "zsg1", 0 )
+	ROM_REGION( 0x400000, "zsg2", 0 )
 	ROM_LOAD( "e24-04.27",    0x0000000, 0x400000, CRC(f403493a) SHA1(3e49fd2a060a3893e26f14cc3cf47c4ba91e17d4) )
 ROM_END
 
@@ -4166,7 +4166,7 @@ ROM_START( raystormo )
 	ROM_REGION( 0x080000, "mn10200", 0 )
 	ROM_LOAD( "e24-09.14",    0x0000000, 0x080000, CRC(808589e1) SHA1(46ada4c6d68c2462186a0b962abb435ee740c0ba) )
 
-	ROM_REGION( 0x400000, "zsg1", 0 )
+	ROM_REGION( 0x400000, "zsg2", 0 )
 	ROM_LOAD( "e24-04.27",    0x0000000, 0x400000, CRC(f403493a) SHA1(3e49fd2a060a3893e26f14cc3cf47c4ba91e17d4) )
 ROM_END
 
@@ -4182,7 +4182,7 @@ ROM_START( raystormu )
 	ROM_REGION( 0x080000, "mn10200", 0 )
 	ROM_LOAD( "e24-09.14",    0x0000000, 0x080000, CRC(808589e1) SHA1(46ada4c6d68c2462186a0b962abb435ee740c0ba) )
 
-	ROM_REGION( 0x400000, "zsg1", 0 )
+	ROM_REGION( 0x400000, "zsg2", 0 )
 	ROM_LOAD( "e24-04.27",    0x0000000, 0x400000, CRC(f403493a) SHA1(3e49fd2a060a3893e26f14cc3cf47c4ba91e17d4) )
 ROM_END
 
@@ -4198,7 +4198,7 @@ ROM_START( raystormj )
 	ROM_REGION( 0x080000, "mn10200", 0 )
 	ROM_LOAD( "e24-09.14",    0x0000000, 0x080000, CRC(808589e1) SHA1(46ada4c6d68c2462186a0b962abb435ee740c0ba) )
 
-	ROM_REGION( 0x400000, "zsg1", 0 )
+	ROM_REGION( 0x400000, "zsg2", 0 )
 	ROM_LOAD( "e24-04.27",    0x0000000, 0x400000, CRC(f403493a) SHA1(3e49fd2a060a3893e26f14cc3cf47c4ba91e17d4) )
 ROM_END