diff --git a/src/mame/drivers/sms_bootleg.cpp b/src/mame/drivers/sms_bootleg.cpp
index 7b1b78f6f98..f97bbef6c1d 100644
--- a/src/mame/drivers/sms_bootleg.cpp
+++ b/src/mame/drivers/sms_bootleg.cpp
@@ -6,11 +6,6 @@
 this is an SMS multi-game bootleg with 32 games
 
 
-the dump is incomplete; there is a chip near a position marked on the board as ROM4 with the following markings
-"SG11004A
-79ST0086END
-9045"
-it should be a 512KB MASK rom containing 11 of the games.
 
 there are also empty k9/k10/k11/k12 positions, but they were clearly never used.
 
@@ -283,12 +278,10 @@ DRIVER_INIT_MEMBER(smsbootleg_state,sms_supergame)
 
 ROM_START( smssgame )
 	ROM_REGION( 0x200000, "maincpu", 0 )
-	ROM_LOAD( "Rom1.bin", 0x00000, 0x10000, CRC(0e1f258e) SHA1(9240dc0d01e3061c0c8807c07c0a1d033ebe9116) ) // yes, this rom is smaller (menu rom)
+	ROM_LOAD( "rom1.bin", 0x00000, 0x10000, CRC(0e1f258e) SHA1(9240dc0d01e3061c0c8807c07c0a1d033ebe9116) ) // yes, this rom is smaller (menu rom)
 
 	ROM_LOAD( "rom2.bin",0x020000, 0x20000, CRC(c1478323) SHA1(27b524a234f072e81ef41fb89a5fff5617e9b951) ) // Buk Doo Sun
 	ROM_LOAD( "rom3.bin",0x040000, 0x20000, CRC(96c8705d) SHA1(ba4f4af0cfdad1d63a08201ed186c79aea062b95) ) // ? Kung Fu game (Hello Kang Si?)
-	// there is something in the position marked ROM4.
-
 	// k12 unpopulated
 	// k11 unpopulated
 	// k10 unpopulated
@@ -302,7 +295,8 @@ ROM_START( smssgame )
 	ROM_LOAD( "K2.bin",  0x120000, 0x20000, CRC(a12439f4) SHA1(e957d4fe275e982bedef28af8cc2957da27dc512) ) // Final Bubble Bobble (1/2)
 	ROM_LOAD( "K1.bin",  0x140000, 0x20000, CRC(dadffecd) SHA1(68ebb968539049a9e193da5200856b9f956f7e02) ) // Final Bubble Bobble (2/2)
 
-	ROM_LOAD( "rom4.bin",0x180000, 0x80000, NO_DUMP ) // missing
+	// this mask rom appears to be taken straight from an SMS multi-game cart, bank 0 of it is even a menu just for the games in this ROM! same style, so presumably the same developer (Seo Jin 1990 copyright)
+	ROM_LOAD( "SG11004A 79ST0086END 9045.rom4",0x180000, 0x080000, CRC(cb6cbe40) SHA1(f7735f3357bb89ad2918c28eafeaf9808532f599) )
 
 	// there seems to be some kind of MCU for the timer?
 ROM_END