diff --git a/src/mame/drivers/20pacgal.c b/src/mame/drivers/20pacgal.c
index 896891df4dc..383c9733e47 100644
--- a/src/mame/drivers/20pacgal.c
+++ b/src/mame/drivers/20pacgal.c
@@ -31,7 +31,7 @@
           the Z180, but the cpu core doesn't support that yet.
         * Is the clock divide 3 or 4?
 
-    Versions known to exist but not dumped: v1.03 & v1.04
+    Versions known to exist but not dumped: v1.03
 
 ***************************************************************************/
 
@@ -324,7 +324,15 @@ MACHINE_DRIVER_END
  *
  *************************************/
 
-ROM_START( 20pacgal ) /* Version 1.01 */
+ROM_START( 20pacgal ) /* Version 1.04 */
+	ROM_REGION( 0x100000, "main", 0 )
+	ROM_LOAD( "20th_104.u13", 0x00000, 0x40000, CRC(6c474d2d) SHA1(5a150fc9d2ed0e908385b9f9d532aa33cf80dba4) )
+
+	ROM_REGION( 0x8000, "proms", 0 )	/* palette */
+	ROM_LOAD( "20th_101.u14", 0x0000, 0x8000, CRC(c19d9ad0) SHA1(002581fbc2c32cdf7cfb0b0f64061591a462ec14) )
+ROM_END
+
+ROM_START( 20pacgaa ) /* Version 1.01 */
 	ROM_REGION( 0x100000, "main", 0 )
 	ROM_LOAD( "20th_101.u13", 0x00000, 0x40000, CRC(77159582) SHA1(c05e005a941cbdc806dcd76b315069362c792a72) )
 
@@ -340,4 +348,5 @@ ROM_END
  *
  *************************************/
 
-GAME( 2000, 20pacgal, 0, 20pacgal, 20pacgal, 0, ROT90, "Namco", "Ms. Pac-Man/Galaga - 20 Year Reunion", GAME_IMPERFECT_GRAPHICS )
+GAME( 2000, 20pacgal,         0, 20pacgal, 20pacgal, 0, ROT90, "Namco", "Ms. Pac-Man/Galaga - 20 Year Reunion (V1.04)", GAME_IMPERFECT_GRAPHICS )
+GAME( 2000, 20pacgaa,  20pacgal, 20pacgal, 20pacgal, 0, ROT90, "Namco", "Ms. Pac-Man/Galaga - 20 Year Reunion (V1.01)", GAME_IMPERFECT_GRAPHICS )
diff --git a/src/mame/mamedriv.c b/src/mame/mamedriv.c
index a97c792ff1f..01f4197d4fe 100644
--- a/src/mame/mamedriv.c
+++ b/src/mame/mamedriv.c
@@ -869,7 +869,8 @@ const game_driver * const drivers[] =
 	DRIVER( finfrl2j )	/* (c) 1999 */
 
 	/* Misc Namco games */
-	DRIVER( 20pacgal )	/* (c) 2000 */
+	DRIVER( 20pacgal )	/* (c) 2000 Ver 1.04 */
+	DRIVER( 20pacgaa )	/* (c) 2000 Ver 1.01 */
 
 	/* Universal games */
 	DRIVER( cosmicg )	/* 7907 (c) 1979 */