diff --git a/src/mame/drivers/snk68.cpp b/src/mame/drivers/snk68.cpp
index 6c39236c678..d5d4da77550 100644
--- a/src/mame/drivers/snk68.cpp
+++ b/src/mame/drivers/snk68.cpp
@@ -666,23 +666,23 @@ ROM_START( pow )
 	ROM_LOAD( "dg9.l25",   0x000000, 0x08000, CRC(df864a08) SHA1(dd996070077efbbf9d784299b6563cab258e4a8e) )
 	ROM_LOAD( "dg10.m25",  0x008000, 0x08000, CRC(9e470d53) SHA1(f7dc6ac39ade573480e87170a2781f0f72930580) )
 
-	ROM_REGION( 0x200000, "gfx2", 0 )   /* sprites */
-	ROM_LOAD16_BYTE( "snk880.11a", 0x000000, 0x20000, CRC(e70fd906) SHA1(b9e734c074ee1c8ae73e6041d739ab30d2df7d62) )
-	ROM_LOAD16_BYTE( "snk880.15a", 0x000001, 0x20000, CRC(7a90e957) SHA1(9650d7cdbcbbbcdd7f75a1c3c08a195aa456e169) )
-	ROM_LOAD16_BYTE( "snk880.12a", 0x040000, 0x20000, CRC(628b1aed) SHA1(1065ef835da03f7d9776e81c225c3ecdd2affae2) )
-	ROM_LOAD16_BYTE( "snk880.16a", 0x040001, 0x20000, CRC(e40a6c13) SHA1(7ad9dfc65f8c8b316933f0fdd3bc7a243d6eff65) )
-	ROM_LOAD16_BYTE( "snk880.13a", 0x080000, 0x20000, CRC(19dc8868) SHA1(82aaf93fc8f4b3bf947d373d0f41cc0044207c34) ) /* Also can be labeled as DG13 */
-	ROM_LOAD16_BYTE( "snk880.17a", 0x080001, 0x20000, CRC(c7931cc2) SHA1(908313d9b7fa4395b5fb79925d068e4f5d354b21) )
-	ROM_LOAD16_BYTE( "snk880.14a", 0x0c0000, 0x20000, CRC(47cd498b) SHA1(7fbc007f2d817c26af02fef233f5e0681a17052a) )
-	ROM_LOAD16_BYTE( "snk880.18a", 0x0c0001, 0x20000, CRC(eed72232) SHA1(ad614e752cf1d3eac9a04cbc90435f988e90ace7) )
-	ROM_LOAD16_BYTE( "snk880.19a", 0x100000, 0x20000, CRC(1775b8dd) SHA1(c01154749379be6e18baa99f4d94d97942f3dd85) )
-	ROM_LOAD16_BYTE( "snk880.23a", 0x100001, 0x20000, CRC(adb6ad68) SHA1(ed4323d2dfa3efaa496b17f4719f9566d56725e5) )
-	ROM_LOAD16_BYTE( "snk880.20a", 0x140000, 0x20000, CRC(f8e752ec) SHA1(1e1e178303f9af84cbb15249c49a870193ef805f) )
-	ROM_LOAD16_BYTE( "snk880.24a", 0x140001, 0x20000, CRC(dd41865a) SHA1(c86f14342beca896784b88920d9e0879af4179ab) )
-	ROM_LOAD16_BYTE( "snk880.21a", 0x180000, 0x20000, CRC(27e9fffe) SHA1(e8058db40832b986c5addd22dd69b0308d10ec71) )
-	ROM_LOAD16_BYTE( "snk880.25a", 0x180001, 0x20000, CRC(055759ad) SHA1(f9b12320f142075d49d447fb107af99272567d58) )
-	ROM_LOAD16_BYTE( "snk880.22a", 0x1c0000, 0x20000, CRC(aa9c00d8) SHA1(1017ed1cc036c6084b71204a998fd05557a6e59f) )
-	ROM_LOAD16_BYTE( "snk880.26a", 0x1c0001, 0x20000, CRC(9bc261c5) SHA1(f07fef465191d48ccc149d1a62e6382d3fc0ef9f) )
+	ROM_REGION( 0x200000, "gfx2", 0 )   /* sprites, including backgrounds (231000 28-pin mask ROMs or 27C301 OTP EPROMs) */
+	ROM_LOAD16_BYTE( "snk88011a.1a", 0x000000, 0x20000, CRC(e70fd906) SHA1(b9e734c074ee1c8ae73e6041d739ab30d2df7d62) )
+	ROM_LOAD16_BYTE( "snk88015a.2a", 0x000001, 0x20000, CRC(7a90e957) SHA1(9650d7cdbcbbbcdd7f75a1c3c08a195aa456e169) )
+	ROM_LOAD16_BYTE( "snk88012a.1b", 0x040000, 0x20000, CRC(628b1aed) SHA1(1065ef835da03f7d9776e81c225c3ecdd2affae2) )
+	ROM_LOAD16_BYTE( "snk88016a.2b", 0x040001, 0x20000, CRC(e40a6c13) SHA1(7ad9dfc65f8c8b316933f0fdd3bc7a243d6eff65) )
+	ROM_LOAD16_BYTE( "snk88013a.1c", 0x080000, 0x20000, CRC(19dc8868) SHA1(82aaf93fc8f4b3bf947d373d0f41cc0044207c34) ) /* Also can be labeled as DG13 using a 27C301 OTP EPROM */
+	ROM_LOAD16_BYTE( "snk88017a.2c", 0x080001, 0x20000, CRC(c7931cc2) SHA1(908313d9b7fa4395b5fb79925d068e4f5d354b21) )
+	ROM_LOAD16_BYTE( "snk88014a.1d", 0x0c0000, 0x20000, CRC(47cd498b) SHA1(7fbc007f2d817c26af02fef233f5e0681a17052a) )
+	ROM_LOAD16_BYTE( "snk88018a.2d", 0x0c0001, 0x20000, CRC(eed72232) SHA1(ad614e752cf1d3eac9a04cbc90435f988e90ace7) )
+	ROM_LOAD16_BYTE( "snk88019a.3a", 0x100000, 0x20000, CRC(1775b8dd) SHA1(c01154749379be6e18baa99f4d94d97942f3dd85) )
+	ROM_LOAD16_BYTE( "snk88023a.4a", 0x100001, 0x20000, CRC(adb6ad68) SHA1(ed4323d2dfa3efaa496b17f4719f9566d56725e5) )
+	ROM_LOAD16_BYTE( "snk88020a.3b", 0x140000, 0x20000, CRC(f8e752ec) SHA1(1e1e178303f9af84cbb15249c49a870193ef805f) )
+	ROM_LOAD16_BYTE( "snk88024a.4b", 0x140001, 0x20000, CRC(dd41865a) SHA1(c86f14342beca896784b88920d9e0879af4179ab) )
+	ROM_LOAD16_BYTE( "snk88021a.3c", 0x180000, 0x20000, CRC(27e9fffe) SHA1(e8058db40832b986c5addd22dd69b0308d10ec71) )
+	ROM_LOAD16_BYTE( "snk88025a.4c", 0x180001, 0x20000, CRC(055759ad) SHA1(f9b12320f142075d49d447fb107af99272567d58) )
+	ROM_LOAD16_BYTE( "snk88022a.3d", 0x1c0000, 0x20000, CRC(aa9c00d8) SHA1(1017ed1cc036c6084b71204a998fd05557a6e59f) )
+	ROM_LOAD16_BYTE( "snk88026a.4d", 0x1c0001, 0x20000, CRC(9bc261c5) SHA1(f07fef465191d48ccc149d1a62e6382d3fc0ef9f) )
 
 	ROM_REGION( 0x10000, "upd", 0 ) /* UPD7759 samples */
 	ROM_LOAD( "dg7.d20",  0x000000, 0x10000, CRC(aba9a9d3) SHA1(5098cd3a064b8ede24797de8879a277d79e79d75) )
@@ -728,23 +728,23 @@ ROM_START( powj )
 	ROM_LOAD( "dg9.l25",   0x000000, 0x08000, CRC(df864a08) SHA1(dd996070077efbbf9d784299b6563cab258e4a8e) )
 	ROM_LOAD( "dg10.m25",  0x008000, 0x08000, CRC(9e470d53) SHA1(f7dc6ac39ade573480e87170a2781f0f72930580) )
 
-	ROM_REGION( 0x200000, "gfx2", 0 )   /* sprites */
-	ROM_LOAD16_BYTE( "snk880.11a", 0x000000, 0x20000, CRC(e70fd906) SHA1(b9e734c074ee1c8ae73e6041d739ab30d2df7d62) )
-	ROM_LOAD16_BYTE( "snk880.15a", 0x000001, 0x20000, CRC(7a90e957) SHA1(9650d7cdbcbbbcdd7f75a1c3c08a195aa456e169) )
-	ROM_LOAD16_BYTE( "snk880.12a", 0x040000, 0x20000, CRC(628b1aed) SHA1(1065ef835da03f7d9776e81c225c3ecdd2affae2) )
-	ROM_LOAD16_BYTE( "snk880.16a", 0x040001, 0x20000, CRC(e40a6c13) SHA1(7ad9dfc65f8c8b316933f0fdd3bc7a243d6eff65) )
-	ROM_LOAD16_BYTE( "snk880.13a", 0x080000, 0x20000, CRC(19dc8868) SHA1(82aaf93fc8f4b3bf947d373d0f41cc0044207c34) ) /* Also can be labeled as DG13 */
-	ROM_LOAD16_BYTE( "snk880.17a", 0x080001, 0x20000, CRC(c7931cc2) SHA1(908313d9b7fa4395b5fb79925d068e4f5d354b21) )
-	ROM_LOAD16_BYTE( "snk880.14a", 0x0c0000, 0x20000, CRC(47cd498b) SHA1(7fbc007f2d817c26af02fef233f5e0681a17052a) )
-	ROM_LOAD16_BYTE( "snk880.18a", 0x0c0001, 0x20000, CRC(eed72232) SHA1(ad614e752cf1d3eac9a04cbc90435f988e90ace7) )
-	ROM_LOAD16_BYTE( "snk880.19a", 0x100000, 0x20000, CRC(1775b8dd) SHA1(c01154749379be6e18baa99f4d94d97942f3dd85) )
-	ROM_LOAD16_BYTE( "snk880.23a", 0x100001, 0x20000, CRC(adb6ad68) SHA1(ed4323d2dfa3efaa496b17f4719f9566d56725e5) )
-	ROM_LOAD16_BYTE( "snk880.20a", 0x140000, 0x20000, CRC(f8e752ec) SHA1(1e1e178303f9af84cbb15249c49a870193ef805f) )
-	ROM_LOAD16_BYTE( "snk880.24a", 0x140001, 0x20000, CRC(dd41865a) SHA1(c86f14342beca896784b88920d9e0879af4179ab) )
-	ROM_LOAD16_BYTE( "snk880.21a", 0x180000, 0x20000, CRC(27e9fffe) SHA1(e8058db40832b986c5addd22dd69b0308d10ec71) )
-	ROM_LOAD16_BYTE( "snk880.25a", 0x180001, 0x20000, CRC(055759ad) SHA1(f9b12320f142075d49d447fb107af99272567d58) )
-	ROM_LOAD16_BYTE( "snk880.22a", 0x1c0000, 0x20000, CRC(aa9c00d8) SHA1(1017ed1cc036c6084b71204a998fd05557a6e59f) )
-	ROM_LOAD16_BYTE( "snk880.26a", 0x1c0001, 0x20000, CRC(9bc261c5) SHA1(f07fef465191d48ccc149d1a62e6382d3fc0ef9f) )
+	ROM_REGION( 0x200000, "gfx2", 0 )   /* sprites, including backgrounds (231000 28-pin mask ROMs or 27C301 OTP EPROMs) */
+	ROM_LOAD16_BYTE( "snk88011a.1a", 0x000000, 0x20000, CRC(e70fd906) SHA1(b9e734c074ee1c8ae73e6041d739ab30d2df7d62) )
+	ROM_LOAD16_BYTE( "snk88015a.2a", 0x000001, 0x20000, CRC(7a90e957) SHA1(9650d7cdbcbbbcdd7f75a1c3c08a195aa456e169) )
+	ROM_LOAD16_BYTE( "snk88012a.1b", 0x040000, 0x20000, CRC(628b1aed) SHA1(1065ef835da03f7d9776e81c225c3ecdd2affae2) )
+	ROM_LOAD16_BYTE( "snk88016a.2b", 0x040001, 0x20000, CRC(e40a6c13) SHA1(7ad9dfc65f8c8b316933f0fdd3bc7a243d6eff65) )
+	ROM_LOAD16_BYTE( "snk88013a.1c", 0x080000, 0x20000, CRC(19dc8868) SHA1(82aaf93fc8f4b3bf947d373d0f41cc0044207c34) ) /* Also can be labeled as DG13 using a 27C301 OTP EPROM */
+	ROM_LOAD16_BYTE( "snk88017a.2c", 0x080001, 0x20000, CRC(c7931cc2) SHA1(908313d9b7fa4395b5fb79925d068e4f5d354b21) )
+	ROM_LOAD16_BYTE( "snk88014a.1d", 0x0c0000, 0x20000, CRC(47cd498b) SHA1(7fbc007f2d817c26af02fef233f5e0681a17052a) )
+	ROM_LOAD16_BYTE( "snk88018a.2d", 0x0c0001, 0x20000, CRC(eed72232) SHA1(ad614e752cf1d3eac9a04cbc90435f988e90ace7) )
+	ROM_LOAD16_BYTE( "snk88019a.3a", 0x100000, 0x20000, CRC(1775b8dd) SHA1(c01154749379be6e18baa99f4d94d97942f3dd85) )
+	ROM_LOAD16_BYTE( "snk88023a.4a", 0x100001, 0x20000, CRC(adb6ad68) SHA1(ed4323d2dfa3efaa496b17f4719f9566d56725e5) )
+	ROM_LOAD16_BYTE( "snk88020a.3b", 0x140000, 0x20000, CRC(f8e752ec) SHA1(1e1e178303f9af84cbb15249c49a870193ef805f) )
+	ROM_LOAD16_BYTE( "snk88024a.4b", 0x140001, 0x20000, CRC(dd41865a) SHA1(c86f14342beca896784b88920d9e0879af4179ab) )
+	ROM_LOAD16_BYTE( "snk88021a.3c", 0x180000, 0x20000, CRC(27e9fffe) SHA1(e8058db40832b986c5addd22dd69b0308d10ec71) )
+	ROM_LOAD16_BYTE( "snk88025a.4c", 0x180001, 0x20000, CRC(055759ad) SHA1(f9b12320f142075d49d447fb107af99272567d58) )
+	ROM_LOAD16_BYTE( "snk88022a.3d", 0x1c0000, 0x20000, CRC(aa9c00d8) SHA1(1017ed1cc036c6084b71204a998fd05557a6e59f) )
+	ROM_LOAD16_BYTE( "snk88026a.4d", 0x1c0001, 0x20000, CRC(9bc261c5) SHA1(f07fef465191d48ccc149d1a62e6382d3fc0ef9f) )
 
 	ROM_REGION( 0x10000, "upd", 0 ) /* UPD7759 samples */
 	ROM_LOAD( "dg7.d20",  0x000000, 0x10000, CRC(aba9a9d3) SHA1(5098cd3a064b8ede24797de8879a277d79e79d75) )