diff --git a/src/mame/drivers/moo.cpp b/src/mame/drivers/moo.cpp
index ce51b8137b0..83ec73fe71b 100644
--- a/src/mame/drivers/moo.cpp
+++ b/src/mame/drivers/moo.cpp
@@ -835,6 +835,42 @@ ROM_START( buckyea ) /* Version EA */
 	ROM_LOAD( "bucky.nv", 0x0000, 0x080, CRC(6a5986f3) SHA1(3efddeed261b09031c582e12318f00c2cbb214ea) )
 ROM_END
 
+ROM_START( buckyja ) /* Version JA */
+	ROM_REGION( 0x240000, "maincpu", 0 )
+	/* main program */
+    ROM_LOAD16_BYTE( "173_ja_a01.05", 0x000000, 0x040000, CRC(0a32bde7) SHA1(17b7654fd69eb1b82e2949ef324ce599113360aa) )
+	ROM_LOAD16_BYTE( "173_ja_a02.06", 0x000001, 0x040000, CRC(3e6f3955) SHA1(09ca39da8bdb37cb5517fe59cff5467c0623c380) )
+	
+	/* data */
+	ROM_LOAD16_BYTE( "173a03.t5", 0x200000, 0x20000, CRC(cd724026) SHA1(525445499604b713da4d8bc0a88e428654ceab95) )
+	ROM_LOAD16_BYTE( "173a04.t6", 0x200001, 0x20000, CRC(7dd54d6f) SHA1(b0ee8ec445b92254bca881eefd4449972fed506a) )
+
+	ROM_REGION( 0x050000, "soundcpu", 0 )
+	/* Z80 sound program */
+	ROM_LOAD( "173a07.f5",  0x000000, 0x040000, CRC(4cdaee71) SHA1(bdc05d4475415f6fac65d7cdbc48df398e57845e) )
+	ROM_RELOAD(             0x010000, 0x040000 )
+
+	ROM_REGION( 0x200000, "gfx1", 0 )
+	/* tilemaps */
+	ROM_LOAD32_WORD( "173a05.t8",  0x000000, 0x100000, CRC(d14333b4) SHA1(d1a15ead2d156e1fceca0bf202ab3962411caf11) )
+	ROM_LOAD32_WORD( "173a06.t10", 0x000002, 0x100000, CRC(6541a34f) SHA1(15cf481498e3b7e0b2f7bfe5434121cc3bd65662) )
+
+	ROM_REGION( 0x800000, "gfx2", 0 )
+	/* sprites */
+	ROM_LOAD64_WORD( "173a10.b8",  0x000000, 0x200000, CRC(42fb0a0c) SHA1(d68c932cfabdec7896698b433525fe47ef4698d0) )
+	ROM_LOAD64_WORD( "173a11.a8",  0x000002, 0x200000, CRC(b0d747c4) SHA1(0cf1ee1b9a35ded31a81c321df2a076f7b588971) )
+	ROM_LOAD64_WORD( "173a12.b10", 0x000004, 0x200000, CRC(0fc2ad24) SHA1(6eda1043ee1266b8ba938a03a90bc7787210a936) )
+	ROM_LOAD64_WORD( "173a13.a10", 0x000006, 0x200000, CRC(4cf85439) SHA1(8c298bf0e659a830a1830a1180f4ce71215ade45) )
+
+	ROM_REGION( 0x400000, "k054539", 0 )
+	/* K054539 samples */
+	ROM_LOAD( "173a08.b6",  0x000000, 0x200000, CRC(dcdded95) SHA1(8eeb546a0b60a35a6dce36c5ee872e6c93c577c9) )
+	ROM_LOAD( "173a09.a6",  0x200000, 0x200000, CRC(c93697c4) SHA1(0528a604868267a30d281b822c187df118566691) )
+
+	ROM_REGION( 0x80, "eeprom", 0 ) // default eeprom to prevent game booting upside down with error
+	ROM_LOAD( "buckyja.nv", 0x0000, 0x080, CRC(2f280a74) SHA1(c4b4472da57599587325bad6d9e7760916076816) )
+ROM_END
+
 ROM_START( buckyuab ) /* Version UA */
 	ROM_REGION( 0x240000, "maincpu", 0 )
 	/* main program */
@@ -970,5 +1006,6 @@ GAME( 1992, moomesaaab, moomesa, moo,     moo,   driver_device, 0, ROT0, "Konami
 GAME( 1992, moomesabl,  moomesa, moobl,   moo,   driver_device, 0, ROT0, "bootleg", "Wild West C.O.W.-Boys of Moo Mesa (bootleg)", MACHINE_NOT_WORKING | MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE ) // based on Version AA
 GAME( 1992, bucky,      0,       bucky,   bucky, driver_device, 0, ROT0, "Konami",  "Bucky O'Hare (ver EAB)", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
 GAME( 1992, buckyea,    bucky,   bucky,   bucky, driver_device, 0, ROT0, "Konami",  "Bucky O'Hare (ver EA)",  MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
+GAME( 1992, buckyja,    bucky,   bucky,   bucky, driver_device, 0, ROT0, "Konami",  "Bucky O'Hare (ver JA)",  MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
 GAME( 1992, buckyuab,   bucky,   bucky,   bucky, driver_device, 0, ROT0, "Konami",  "Bucky O'Hare (ver UAB)", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
 GAME( 1992, buckyaab,   bucky,   bucky,   bucky, driver_device, 0, ROT0, "Konami",  "Bucky O'Hare (ver AAB)", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
diff --git a/src/mame/mame.lst b/src/mame/mame.lst
index c5ca6087429..0905a65b934 100644
--- a/src/mame/mame.lst
+++ b/src/mame/mame.lst
@@ -20910,6 +20910,7 @@ monzagpb                        // bootleg
 bucky                           // GX173 (c) 1992 (World)
 buckyaab                        // GX173 (c) 1992 (Asia)
 buckyea                         // GX173 (c) 1992 (World)
+buckyja							// GX173 (c) 1992 (Japan)
 buckyuab                        // GX173 (c) 1992 (US)
 moomesa                         // GX151 (c) 1992 (World)
 moomesaaab                      // GX151 (c) 1992 (Asia)