diff --git a/src/mame/drivers/cps1.c b/src/mame/drivers/cps1.c
index 969f7f31a1f..d3978a346bb 100644
--- a/src/mame/drivers/cps1.c
+++ b/src/mame/drivers/cps1.c
@@ -1833,6 +1833,13 @@ static INPUT_PORTS_START( sf2hack )
 	PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_UNKNOWN )
 INPUT_PORTS_END
 
+static INPUT_PORTS_START( sf2m2 )
+	PORT_INCLUDE( sf2hack )
+
+	PORT_MODIFY("DSWB")
+	PORT_DIPUNUSED_DIPLOC( 0x10, 0x00, "SW(B):5" ) // only if HIGH the game boot
+INPUT_PORTS_END
+
 static INPUT_PORTS_START( sf2m4 )
 	PORT_INCLUDE( sf2hack )
 
@@ -8349,7 +8356,7 @@ GAME( 1992, sf2red,   sf2ce,    cps1_12MHz, sf2,      cps1,     ROT0,   "bootleg
 GAME( 1992, sf2v004,  sf2ce,    cps1_12MHz, sf2,      cps1,     ROT0,   "bootleg","Street Fighter II! - Champion Edition (V004, bootleg)", 0 )			// "102092" !!! - based on (heavily modified) World version
 GAME( 1992, sf2accp2, sf2ce,    cps1_12MHz, sf2,      cps1,     ROT0,   "bootleg","Street Fighter II' - Champion Edition (Accelerator Pt.II, bootleg)" , 0)  // 920313 - based on USA version
 GAME( 1992, sf2m1,    sf2ce,    cps1_12MHz, sf2,      cps1,     ROT0,   "bootleg","Street Fighter II' - Champion Edition (M1, bootleg)", GAME_NOT_WORKING )
-GAME( 1992, sf2m2,    sf2ce,    cps1_12MHz, sf2hack,  sf2hack,  ROT0,   "bootleg","Street Fighter II' - Champion Edition (M2, bootleg)", 0 )
+GAME( 1992, sf2m2,    sf2ce,    cps1_12MHz, sf2m2,    sf2hack,  ROT0,   "bootleg","Street Fighter II' - Champion Edition (M2, bootleg)", 0 )
 GAME( 1992, sf2m3,    sf2ce,    cps1_12MHz, sf2,      cps1,     ROT0,   "bootleg","Street Fighter II' - Champion Edition (M3, bootleg)", GAME_NOT_WORKING )
 GAME( 1992, sf2m4,    sf2ce,    cps1_12MHz, sf2m4,    sf2hack,  ROT0,   "bootleg","Street Fighter II' - Champion Edition (M4, bootleg)", 0 )
 GAME( 1992, sf2m5,    sf2ce,    cps1_12MHz, sf2hack,  sf2hack,  ROT0,   "bootleg","Street Fighter II' - Champion Edition (M5, bootleg)", 0 )