diff --git a/src/mame/drivers/midzeus.c b/src/mame/drivers/midzeus.c
index f8ebfc249b7..fde972124c6 100644
--- a/src/mame/drivers/midzeus.c
+++ b/src/mame/drivers/midzeus.c
@@ -5,7 +5,7 @@
     driver by Aaron Giles
 
     Games supported:
-        * Invasion
+        * Invasion - The Abductors
         * Mortal Kombat 4
         * Cruis'n Exotica
         * The Grid
@@ -13,6 +13,15 @@
     Known bugs:
         * not done yet
 
+According to a Midway service bulletin
+As of 2/12/2001 the lastest software levels:
+
+Game Title       Level  Released
+----------------------------------
+Cruis'n Exotica  v2.4   08/13/2000
+Invasion         v5.0   12/14/1999
+The Grid         v1.2   10/18/2000
+
 **************************************************************************/
 
 #include "driver.h"
@@ -1198,27 +1207,45 @@ ROM_START( mk4a )
 	ROM_LOAD32_WORD( "mk4_l3.u17", 0x0c00002, 0x200000, CRC(3a1a082c) SHA1(5f8e8ce760d8ebadd1240ef08f1382a37cf11d0b) )
 ROM_END
 
-
-ROM_START( invasn )
+ROM_START( invasnab )
 	ROM_REGION16_LE( 0x1000000, REGION_SOUND1, ROMREGION_ERASEFF )	/* sound data */
-	ROM_LOAD16_BYTE( "invasion.u2", 0x000000, 0x200000, CRC(59d2e1d6) SHA1(994a4311ac4841d4341449c0c7480952b6f3855d) )
-	ROM_LOAD16_BYTE( "invasion.u3", 0x400000, 0x200000, CRC(86b956ae) SHA1(f7fd4601a2ce3e7e9b67e7d77908bfa206ee7e62) )
-	ROM_LOAD16_BYTE( "invasion.u4", 0x800000, 0x200000, CRC(5ef1fab5) SHA1(987afa0672fa89b18cf20d28644848a9e5ee9b17) )
-	ROM_LOAD16_BYTE( "invasion.u5", 0xc00000, 0x200000, CRC(e42805c9) SHA1(e5b71eb1852809a649ac43a82168b3bdaf4b1526) )
+	ROM_LOAD16_BYTE( "invasion2.u2", 0x000000, 0x200000, CRC(59d2e1d6) SHA1(994a4311ac4841d4341449c0c7480952b6f3855d) ) /* These four sound roms were labeled as v2.0 */
+	ROM_LOAD16_BYTE( "invasion2.u3", 0x400000, 0x200000, CRC(86b956ae) SHA1(f7fd4601a2ce3e7e9b67e7d77908bfa206ee7e62) )
+	ROM_LOAD16_BYTE( "invasion2.u4", 0x800000, 0x200000, CRC(5ef1fab5) SHA1(987afa0672fa89b18cf20d28644848a9e5ee9b17) )
+	ROM_LOAD16_BYTE( "invasion2.u5", 0xc00000, 0x200000, CRC(e42805c9) SHA1(e5b71eb1852809a649ac43a82168b3bdaf4b1526) )
 
 	ROM_REGION32_LE( 0x1800000, REGION_USER1, 0 )
-	ROM_LOAD32_WORD( "invasion.u10", 0x0000000, 0x200000, CRC(b3ce958b) SHA1(ed51c167d85bc5f6155b8046ec056a4f4ad5cf9d) )
-	ROM_LOAD32_WORD( "invasion.u11", 0x0000002, 0x200000, CRC(0bd09359) SHA1(f40886bd2e5f5fbf506580e5baa2f733be200852) )
-	ROM_LOAD32_WORD( "invasion.u12", 0x0400000, 0x200000, CRC(ce1eb06a) SHA1(ff17690a0cbca6dcccccde70e2c5812ae03db5bb) )
-	ROM_LOAD32_WORD( "invasion.u13", 0x0400002, 0x200000, CRC(33fc6707) SHA1(11a39ad980ec320547319eca6ffa5aef3ab8b010) )
-	ROM_LOAD32_WORD( "invasion.u14", 0x0800000, 0x200000, CRC(760682a1) SHA1(ff91210225d4aa750115c6219d4c35c9521a3f0b) )
-	ROM_LOAD32_WORD( "invasion.u15", 0x0800002, 0x200000, CRC(90467d7a) SHA1(a143a3d3605e5626852e75937160ba6bcd891608) )
-	ROM_LOAD32_WORD( "invasion.u16", 0x0c00000, 0x200000, CRC(3ef1b28d) SHA1(6f9a071b8830194fea84daa62aadabae86977c5f) )
-	ROM_LOAD32_WORD( "invasion.u17", 0x0c00002, 0x200000, CRC(97aa677a) SHA1(4d21cc59e0ffd4985f89c97c71d605c3b404a8a3) )
-	ROM_LOAD32_WORD( "invasion.u18", 0x1000000, 0x200000, CRC(6930c656) SHA1(28054ff9a6c6f5764a371f8defe4c1f5730618f3) )
-	ROM_LOAD32_WORD( "invasion.u19", 0x1000002, 0x200000, CRC(89fa6ee5) SHA1(572565e1308142b0b062aa72315c68e928f2419c) )
+	ROM_LOAD32_WORD( "invasion5.u10", 0x0000000, 0x200000, CRC(8c7785d9) SHA1(701602314cd4eba4215c47ea0ae75fd4eddad43b) ) /* Roms U10 & U11 were labeled as v5.0 */
+	ROM_LOAD32_WORD( "invasion5.u11", 0x0000002, 0x200000, CRC(8ceb1f32) SHA1(82d01f25cba25d77b11c347632e8b72776e12984) )
+	ROM_LOAD32_WORD( "invasion4.u12", 0x0400000, 0x200000, CRC(ce1eb06a) SHA1(ff17690a0cbca6dcccccde70e2c5812ae03db5bb) ) /* Roms U12 through U19 were all labeled as v4.0 */
+	ROM_LOAD32_WORD( "invasion4.u13", 0x0400002, 0x200000, CRC(33fc6707) SHA1(11a39ad980ec320547319eca6ffa5aef3ab8b010) )
+	ROM_LOAD32_WORD( "invasion4.u14", 0x0800000, 0x200000, CRC(760682a1) SHA1(ff91210225d4aa750115c6219d4c35c9521a3f0b) )
+	ROM_LOAD32_WORD( "invasion4.u15", 0x0800002, 0x200000, CRC(90467d7a) SHA1(a143a3d3605e5626852e75937160ba6bcd891608) )
+	ROM_LOAD32_WORD( "invasion4.u16", 0x0c00000, 0x200000, CRC(3ef1b28d) SHA1(6f9a071b8830194fea84daa62aadabae86977c5f) )
+	ROM_LOAD32_WORD( "invasion4.u17", 0x0c00002, 0x200000, CRC(97aa677a) SHA1(4d21cc59e0ffd4985f89c97c71d605c3b404a8a3) )
+	ROM_LOAD32_WORD( "invasion4.u18", 0x1000000, 0x200000, CRC(6930c656) SHA1(28054ff9a6c6f5764a371f8defe4c1f5730618f3) )
+	ROM_LOAD32_WORD( "invasion4.u19", 0x1000002, 0x200000, CRC(89fa6ee5) SHA1(572565e1308142b0b062aa72315c68e928f2419c) )
 ROM_END
 
+ROM_START( invasnv4 )
+	ROM_REGION16_LE( 0x1000000, REGION_SOUND1, ROMREGION_ERASEFF )	/* sound data */
+	ROM_LOAD16_BYTE( "invasion2.u2", 0x000000, 0x200000, CRC(59d2e1d6) SHA1(994a4311ac4841d4341449c0c7480952b6f3855d) ) /* These four sound roms were labeled as v2.0 */
+	ROM_LOAD16_BYTE( "invasion2.u3", 0x400000, 0x200000, CRC(86b956ae) SHA1(f7fd4601a2ce3e7e9b67e7d77908bfa206ee7e62) )
+	ROM_LOAD16_BYTE( "invasion2.u4", 0x800000, 0x200000, CRC(5ef1fab5) SHA1(987afa0672fa89b18cf20d28644848a9e5ee9b17) )
+	ROM_LOAD16_BYTE( "invasion2.u5", 0xc00000, 0x200000, CRC(e42805c9) SHA1(e5b71eb1852809a649ac43a82168b3bdaf4b1526) )
+
+	ROM_REGION32_LE( 0x1800000, REGION_USER1, 0 )
+	ROM_LOAD32_WORD( "invasion4.u10", 0x0000000, 0x200000, CRC(b3ce958b) SHA1(ed51c167d85bc5f6155b8046ec056a4f4ad5cf9d) ) /* These rom were all labeled as v4.0 */
+	ROM_LOAD32_WORD( "invasion4.u11", 0x0000002, 0x200000, CRC(0bd09359) SHA1(f40886bd2e5f5fbf506580e5baa2f733be200852) )
+	ROM_LOAD32_WORD( "invasion4.u12", 0x0400000, 0x200000, CRC(ce1eb06a) SHA1(ff17690a0cbca6dcccccde70e2c5812ae03db5bb) )
+	ROM_LOAD32_WORD( "invasion4.u13", 0x0400002, 0x200000, CRC(33fc6707) SHA1(11a39ad980ec320547319eca6ffa5aef3ab8b010) )
+	ROM_LOAD32_WORD( "invasion4.u14", 0x0800000, 0x200000, CRC(760682a1) SHA1(ff91210225d4aa750115c6219d4c35c9521a3f0b) )
+	ROM_LOAD32_WORD( "invasion4.u15", 0x0800002, 0x200000, CRC(90467d7a) SHA1(a143a3d3605e5626852e75937160ba6bcd891608) )
+	ROM_LOAD32_WORD( "invasion4.u16", 0x0c00000, 0x200000, CRC(3ef1b28d) SHA1(6f9a071b8830194fea84daa62aadabae86977c5f) )
+	ROM_LOAD32_WORD( "invasion4.u17", 0x0c00002, 0x200000, CRC(97aa677a) SHA1(4d21cc59e0ffd4985f89c97c71d605c3b404a8a3) )
+	ROM_LOAD32_WORD( "invasion4.u18", 0x1000000, 0x200000, CRC(6930c656) SHA1(28054ff9a6c6f5764a371f8defe4c1f5730618f3) )
+	ROM_LOAD32_WORD( "invasion4.u19", 0x1000002, 0x200000, CRC(89fa6ee5) SHA1(572565e1308142b0b062aa72315c68e928f2419c) )
+ROM_END
 
 ROM_START( crusnexo )
 	ROM_REGION16_LE( 0xc00000, REGION_SOUND1, ROMREGION_ERASEFF )	/* sound data */
@@ -1320,8 +1347,9 @@ static DRIVER_INIT( thegrid )
  *
  *************************************/
 
-GAME( 1997, mk4,      0,     midzeus,  mk4,      mk4,      ROT0, "Midway", "Mortal Kombat 4 (3.0)", GAME_IMPERFECT_GRAPHICS | GAME_SUPPORTS_SAVE )
-GAME( 1997, mk4a,     mk4,   midzeus,  mk4,      mk4,      ROT0, "Midway", "Mortal Kombat 4 (2.1)", GAME_IMPERFECT_GRAPHICS | GAME_SUPPORTS_SAVE )
-GAME( 1999, invasn,   0,     midzeus,  invasn,   invasn,   ROT0, "Midway", "Invasion (Midway)", GAME_IMPERFECT_GRAPHICS | GAME_SUPPORTS_SAVE )
-GAMEL( 1999, crusnexo, 0,     midzeus2, crusnexo, crusnexo, ROT0, "Midway", "Cruis'n Exotica", GAME_NOT_WORKING | GAME_IMPERFECT_GRAPHICS | GAME_SUPPORTS_SAVE, layout_crusnexo )
-GAME( 2001, thegrid,  0,     midzeus2, thegrid,  thegrid,  ROT0, "Midway", "The Grid (version 1.1)", GAME_NOT_WORKING | GAME_IMPERFECT_GRAPHICS | GAME_SUPPORTS_SAVE )
+GAME(  1997, mk4,      0,        midzeus,  mk4,      mk4,      ROT0, "Midway", "Mortal Kombat 4 (version 3.0)", GAME_IMPERFECT_GRAPHICS | GAME_SUPPORTS_SAVE )
+GAME(  1997, mk4a,     mk4,      midzeus,  mk4,      mk4,      ROT0, "Midway", "Mortal Kombat 4 (version 2.1)", GAME_IMPERFECT_GRAPHICS | GAME_SUPPORTS_SAVE )
+GAME(  1999, invasnab, 0,        midzeus,  invasn,   invasn,   ROT0, "Midway", "Invasion - The Abductors (version 5.0)", GAME_IMPERFECT_GRAPHICS | GAME_SUPPORTS_SAVE )
+GAME(  1999, invasnv4, invasnab, midzeus,  invasn,   invasn,   ROT0, "Midway", "Invasion - The Abductors (version 4.0)", GAME_IMPERFECT_GRAPHICS | GAME_SUPPORTS_SAVE )
+GAMEL( 1999, crusnexo, 0,        midzeus2, crusnexo, crusnexo, ROT0, "Midway", "Cruis'n Exotica (version 1.6)", GAME_NOT_WORKING | GAME_IMPERFECT_GRAPHICS | GAME_SUPPORTS_SAVE, layout_crusnexo )
+GAME(  2001, thegrid,  0,        midzeus2, thegrid,  thegrid,  ROT0, "Midway", "The Grid (version 1.1)", GAME_NOT_WORKING | GAME_IMPERFECT_GRAPHICS | GAME_SUPPORTS_SAVE )
diff --git a/src/mame/mamedriv.c b/src/mame/mamedriv.c
index 108f4085fde..b74a4dc2ed2 100644
--- a/src/mame/mamedriv.c
+++ b/src/mame/mamedriv.c
@@ -6015,7 +6015,8 @@ BOMULEUL CHAJARA SEGA ST-V  1997/04/11
 	/* Midway Zeus games */
 	DRIVER( mk4 )		/* (c) 1997 Midway */
 	DRIVER( mk4a )		/* (c) 1997 Midway */
-	DRIVER( invasn )	/* (c) 1999 Midway */
+	DRIVER( invasnab )	/* (c) 1999 Midway */
+	DRIVER( invasnv4 )	/* (c) 1999 Midway */
 	DRIVER( crusnexo )	/* (c) 1999 Midway */
 	DRIVER( thegrid )	/* (c) 2001 Midway */