diff --git a/src/mame/drivers/thoop2.cpp b/src/mame/drivers/thoop2.cpp
index 427afb9315b..62616205c0b 100644
--- a/src/mame/drivers/thoop2.cpp
+++ b/src/mame/drivers/thoop2.cpp
@@ -296,10 +296,10 @@ MACHINE_CONFIG_END
 
 
 
-ROM_START( thoop2 )
+ROM_START( thoop2 ) /* REF.940411 PCB */
 	ROM_REGION( 0x100000, "maincpu", 0 )    /* 68000 code */
-	ROM_LOAD16_BYTE(    "th2c23.040",   0x000000, 0x080000, CRC(3e465753) SHA1(1ea1173b9fe5d652e7b5fafb822e2535cecbc198) )
-	ROM_LOAD16_BYTE(    "th2c22.040",   0x000001, 0x080000, CRC(837205b7) SHA1(f78b90c2be0b4dddaba26f074ea00eff863cfdb2) )
+	ROM_LOAD16_BYTE(    "th2c23.c23",   0x000000, 0x080000, CRC(3e465753) SHA1(1ea1173b9fe5d652e7b5fafb822e2535cecbc198) )
+	ROM_LOAD16_BYTE(    "th2c22.c22",   0x000001, 0x080000, CRC(837205b7) SHA1(f78b90c2be0b4dddaba26f074ea00eff863cfdb2) )
 
 	ROM_REGION( 0x8000, "gaelco_ds5002fp:sram", 0 ) /* DS5002FP code */
 	ROM_LOAD( "thoop2_ds5002fp.bin", 0x00000, 0x8000, CRC(6881384d) SHA1(c1eff5558716293e1325b766e2205783286c12f9) ) /* dumped from 3 boards, reconstructed with 2/3 wins rule, all bytes verified by hand as correct */
@@ -311,12 +311,36 @@ ROM_START( thoop2 )
 	DS5002FP_SET_CRCR( 0x80 )
 
 	ROM_REGION( 0x800000, "gfx1", 0 )
-	ROM_LOAD( "th2-h8.32m",     0x000000, 0x400000, CRC(60328a11) SHA1(fcdb374d2fc7ef5351a4181c471d192199dc2081) )
-	ROM_LOAD( "th2-h12.32m",    0x400000, 0x400000, CRC(b25c2d3e) SHA1(d70f3e4e2432d80c2ac87cd81208ada303bac04a) )
+	ROM_LOAD( "th2-h8.h8",     0x000000, 0x400000, CRC(60328a11) SHA1(fcdb374d2fc7ef5351a4181c471d192199dc2081) )
+	ROM_LOAD( "th2-h12.h12",   0x400000, 0x400000, CRC(b25c2d3e) SHA1(d70f3e4e2432d80c2ac87cd81208ada303bac04a) )
 
 	ROM_REGION( 0x100000, "oki", 0 )    /* ADPCM samples - sound chip is OKIM6295 */
-	ROM_LOAD( "th2-c1.080",     0x000000, 0x100000, CRC(8fac8c30) SHA1(8e49bb596144761eae95f3e1266e57fb386664f2) )
+	ROM_LOAD( "th2-c1.c1",     0x000000, 0x100000, CRC(8fac8c30) SHA1(8e49bb596144761eae95f3e1266e57fb386664f2) )
 	/* 0x00000-0x2ffff is fixed, 0x30000-0x3ffff is bank switched */
 ROM_END
 
-GAME( 1994, thoop2,  0, thoop2, thoop2, thoop2_state,  0, ROT0, "Gaelco", "TH Strikes Back", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
+ROM_START( thoop2a ) /* REF.940411 PCB */
+	ROM_REGION( 0x100000, "maincpu", 0 )    /* 68000 code */
+	ROM_LOAD16_BYTE(    "3.c23",   0x000000, 0x080000, CRC(6cd4a8dc) SHA1(7d0cdce64b390c3f9769b07d57cf1eee1e6a7bf5) )
+	ROM_LOAD16_BYTE(    "2.c22",   0x000001, 0x080000, CRC(59ba9b43) SHA1(6c6690a2e389fc9f1e166c87748da1175e3b58f8) )
+
+	ROM_REGION( 0x8000, "gaelco_ds5002fp:sram", 0 ) /* DS5002FP code */
+	ROM_LOAD( "thoop2_ds5002fp.bin", 0x00000, 0x8000, CRC(6881384d) SHA1(c1eff5558716293e1325b766e2205783286c12f9) ) /* dumped from 3 boards, reconstructed with 2/3 wins rule, all bytes verified by hand as correct */
+
+	ROM_REGION( 0x100, "gaelco_ds5002fp:mcu:internal", ROMREGION_ERASE00 )
+	/* these are the default states stored in NVRAM */
+	DS5002FP_SET_MON( 0x79 )
+	DS5002FP_SET_RPCTL( 0x00 )
+	DS5002FP_SET_CRCR( 0x80 )
+
+	ROM_REGION( 0x800000, "gfx1", 0 )
+	ROM_LOAD( "th2-h8.h8",     0x000000, 0x400000, CRC(60328a11) SHA1(fcdb374d2fc7ef5351a4181c471d192199dc2081) )
+	ROM_LOAD( "th2-h12.h12",   0x400000, 0x400000, CRC(b25c2d3e) SHA1(d70f3e4e2432d80c2ac87cd81208ada303bac04a) )
+
+	ROM_REGION( 0x100000, "oki", 0 )    /* ADPCM samples - sound chip is OKIM6295 */
+	ROM_LOAD( "th2-c1.c1",     0x000000, 0x100000, CRC(8fac8c30) SHA1(8e49bb596144761eae95f3e1266e57fb386664f2) )
+	/* 0x00000-0x2ffff is fixed, 0x30000-0x3ffff is bank switched */
+ROM_END
+
+GAME( 1994, thoop2,       0, thoop2, thoop2, thoop2_state,  0, ROT0, "Gaelco", "TH Strikes Back (Non North America, Version 1.0, Checksum 020E0867)", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
+GAME( 1994, thoop2a, thoop2, thoop2, thoop2, thoop2_state,  0, ROT0, "Gaelco", "TH Strikes Back (Non North America, Version 1.0, Checksum 020EB356)", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
diff --git a/src/mame/mame.lst b/src/mame/mame.lst
index 6107f4a21b6..7652c3c2748 100644
--- a/src/mame/mame.lst
+++ b/src/mame/mame.lst
@@ -36285,7 +36285,8 @@ to9                             // 1985 Thomson T09
 to9p                            // 1986 Thomson T09+
 
 @source:thoop2.cpp
-thoop2                          // (c) 1994 - Ref ???
+thoop2                          // (c) 1994 - REF.940411
+thoop2a                         // (c) 1994 - REF.940411
 
 @source:thunderj.cpp
 thunderj                        // 136076           (c) 1990