diff --git a/src/mame/drivers/aladbl.c b/src/mame/drivers/aladbl.c
index 646a4ba2c8d..cba7aca6ef2 100644
--- a/src/mame/drivers/aladbl.c
+++ b/src/mame/drivers/aladbl.c
@@ -154,56 +154,6 @@ ROM_START( mk3ghw ) // roms are scrambled, we take care of the address descrambl
 	ROM_CONTINUE(            0x300000, 0x040000)
 ROM_END
 
-// this should be correct, the areas of the rom that differ to the original
-// after this decode look like intentional changes
-static DRIVER_INIT( mk3ghw )
-{
-	DRIVER_INIT_CALL(megadriv);
-
-	UINT8 *ROM = memory_region(machine, "maincpu");
-	int x;
-
-	for (x=0x000001;x<0x100001;x+=2)
-	{
-		if (x&0x80000)
-		{
-			ROM[x] = ROM[x]^0xff;
-			ROM[x] = BITSWAP8(ROM[x], 0,3,2,5,4,6,7,1);
-		}
-		else
-		{
-			ROM[x] = ROM[x]^0xff;
-			ROM[x] = BITSWAP8(ROM[x], 4,0,7,1,3,6,2,5);
-		}
-	}
-
-	for (x=0x100001;x<0x400000;x+=2)
-	{
-		if (x&0x80000)
-		{
-			ROM[x] = ROM[x]^0xff;
-			ROM[x] = BITSWAP8(ROM[x], 2,7,5,4,1,0,3,6);
-		}
-		else
-		{
-			ROM[x] = BITSWAP8(ROM[x], 6,1,4,2,7,0,3,5);
-		}
-	}
-
-	// boot vectors don't seem to be valid, so they are patched...
-	ROM[1] = 0x01;
-	ROM[0] = 0x00;
-	ROM[3] = 0x00;
-	ROM[2] = 0x00;
-	ROM[5] = 0x00;
-	ROM[4] = 0x00;
-	ROM[7] = 0x02;
-	ROM[6] = 0x10;
-
-	memory_install_read_port(cputag_get_address_space(machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0x770070, 0x770071, 0, 0, "DSWA");
-	memory_install_read_port(cputag_get_address_space(machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0x770072, 0x770073, 0, 0, "DSWB");
-}
-
 
 static WRITE16_HANDLER( aladbl_w )
 {
@@ -229,13 +179,72 @@ static READ16_HANDLER( aladbl_r )
 	return 0x0000;
 }
 
+
+static READ16_HANDLER( mk3ghw_dsw_r )
+{
+	static const char *const dswname[3] = { "DSWA", "DSWB", "DSWC" };
+	return input_port_read(space->machine, dswname[offset]);
+}
+
+
 static DRIVER_INIT( aladbl )
 {
 	// 220000 = writes to mcu? 330000 = reads?
 	memory_install_write16_handler(cputag_get_address_space(machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0x220000, 0x220001, 0, 0, aladbl_w);
 	memory_install_read16_handler(cputag_get_address_space(machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0x330000, 0x330001, 0, 0, aladbl_r);
+
 	DRIVER_INIT_CALL(megadrij);
 }
 
-GAME( 1993, aladbl ,  0,   megadriv,    aladbl,       aladbl,  ROT0,   "bootleg / Sega", "Aladdin (bootleg of Japanese Megadrive version)", 0)
-GAME( 1996, mk3ghw ,  0,   megadriv,    mk3ghw,       mk3ghw,  ROT0,   "bootleg / Midway", "Mortal Kombat 3 (bootleg of Megadrive version)", 0)
+// this should be correct, the areas of the rom that differ to the original
+// after this decode look like intentional changes
+static DRIVER_INIT( mk3ghw )
+{
+	int x;
+	UINT8 *rom = memory_region(machine, "maincpu");
+
+	for (x=0x000001;x<0x100001;x+=2)
+	{
+		if (x&0x80000)
+		{
+			rom[x] = rom[x]^0xff;
+			rom[x] = BITSWAP8(rom[x], 0,3,2,5,4,6,7,1);
+		}
+		else
+		{
+			rom[x] = rom[x]^0xff;
+			rom[x] = BITSWAP8(rom[x], 4,0,7,1,3,6,2,5);
+		}
+	}
+
+	for (x=0x100001;x<0x400000;x+=2)
+	{
+		if (x&0x80000)
+		{
+			rom[x] = rom[x]^0xff;
+			rom[x] = BITSWAP8(rom[x], 2,7,5,4,1,0,3,6);
+		}
+		else
+		{
+			rom[x] = BITSWAP8(rom[x], 6,1,4,2,7,0,3,5);
+		}
+	}
+
+	// boot vectors don't seem to be valid, so they are patched...
+	rom[0x01] = 0x01;
+	rom[0x00] = 0x00;
+	rom[0x03] = 0x00;
+	rom[0x02] = 0x00;
+	rom[0x05] = 0x00;
+	rom[0x04] = 0x00;
+	rom[0x07] = 0x02;
+	rom[0x06] = 0x10;
+
+	memory_install_read16_handler(cputag_get_address_space(machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0x770070, 0x770075, 0, 0, mk3ghw_dsw_r );
+
+	DRIVER_INIT_CALL(megadriv);
+}
+
+
+GAME( 1993, aladbl,   0, megadriv, aladbl,   aladbl,   ROT0, "bootleg / Sega", "Aladdin (bootleg of Japanese Megadrive version)", 0)
+GAME( 1996, mk3ghw,   0, megadriv, mk3ghw,   mk3ghw,   ROT0, "bootleg / Midway", "Mortal Kombat 3 (bootleg of Megadrive version)", 0)
diff --git a/src/mame/drivers/megadriv.c b/src/mame/drivers/megadriv.c
index c8a53db40d8..3bf75e8d3bd 100644
--- a/src/mame/drivers/megadriv.c
+++ b/src/mame/drivers/megadriv.c
@@ -1533,6 +1533,7 @@ INPUT_PORTS_START( megadri6 )
 	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_BUTTON8 ) PORT_PLAYER(2) PORT_NAME("P2 MODE") // mode
 INPUT_PORTS_END
 
+/* verified from M68000 code */
 INPUT_PORTS_START( ssf2ghw )
 	PORT_INCLUDE( md_common )
 
@@ -1546,7 +1547,7 @@ INPUT_PORTS_START( ssf2ghw )
 	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
 	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(2)
 	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
-	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_START1 )
+	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_START2 )
 
 	PORT_START("EXTRA1")	/* Extra buttons for Joypad 1 (6 button + start + mode) NOT READ DIRECTLY */
 	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_BUTTON6 ) PORT_PLAYER(1)
@@ -1606,7 +1607,8 @@ INPUT_PORTS_START( ssf2ghw )
 //  PORT_DIPSETTING(    0x00, "10 (Fastest)" )
 INPUT_PORTS_END
 
-INPUT_PORTS_START(mk3ghw)
+/* verified from M68000 code */
+INPUT_PORTS_START( mk3ghw )
 	PORT_INCLUDE( md_common )
 
 	PORT_MODIFY("PAD1")
@@ -1634,8 +1636,8 @@ INPUT_PORTS_START(mk3ghw)
 	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_UNUSED )
 
 	PORT_START("IN0")
-	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 ) PORT_IMPULSE(1)
-	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 ) PORT_IMPULSE(1)
+	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_COIN1 )
+	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_COIN2 )
 
 	PORT_START("DSWA")
 	PORT_DIPNAME( 0x07, 0x07, DEF_STR( Coinage ) )
@@ -1646,22 +1648,32 @@ INPUT_PORTS_START(mk3ghw)
 	PORT_DIPSETTING(    0x06, DEF_STR( 1C_2C ) )
 	PORT_DIPSETTING(    0x05, DEF_STR( 1C_3C ) )
 	PORT_DIPSETTING(    0x04, DEF_STR( 1C_4C ) )
-	PORT_BIT( 0xf8, 0x00, IPT_UNUSED )
+//  PORT_DIPSETTING(    0x00, DEF_STR( 1C_1C ) )
 
 	PORT_START("DSWB")
-	PORT_DIPUNKNOWN( 0x01, 0x00 )
-	PORT_DIPUNKNOWN( 0x02, 0x00 )
-	PORT_DIPUNKNOWN( 0x04, 0x00 )
-	PORT_DIPUNKNOWN( 0x08, 0x00 )
-	PORT_DIPUNKNOWN( 0x10, 0x00 )
-	PORT_DIPUNKNOWN( 0x20, 0x00 )
+	PORT_DIPNAME( 0x07, 0x07, DEF_STR( Difficulty ) )
+	PORT_DIPSETTING(    0x07, DEF_STR( Easiest ) )
+	PORT_DIPSETTING(    0x06, DEF_STR( Easy ) )
+	PORT_DIPSETTING(    0x05, DEF_STR( Medium ) )
+	PORT_DIPSETTING(    0x04, DEF_STR( Hard ) )
+	PORT_DIPSETTING(    0x03, DEF_STR( Hardest ) )
+//	PORT_DIPSETTING(    0x02, DEF_STR( Hardest ) )
+//	PORT_DIPSETTING(    0x01, DEF_STR( Hardest ) )
+//	PORT_DIPSETTING(    0x00, DEF_STR( Hardest ) )
+	PORT_DIPUNUSED( 0x08, IP_ACTIVE_HIGH )
+	PORT_DIPUNUSED( 0x10, IP_ACTIVE_HIGH )
+	PORT_DIPUNUSED( 0x20, IP_ACTIVE_HIGH )
 	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Demo_Sounds ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x40, DEF_STR( On ) )
-	PORT_DIPUNKNOWN( 0x80, 0x00 )
+	PORT_DIPNAME( 0x80, 0x80, "Blood" )
+	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
+	PORT_DIPSETTING(    0x80, DEF_STR( On ) )
+
+	PORT_START("DSWC")        /* not even read in this set */
 INPUT_PORTS_END
 
-
+/* verified from M68000 code */
 INPUT_PORTS_START( aladbl )
 	PORT_INCLUDE( md_common )
 
@@ -1691,11 +1703,57 @@ INPUT_PORTS_START( aladbl )
 	PORT_DIPSETTING(    0x00, DEF_STR( Normal ) )           /* "NORMAL" */
 	PORT_DIPSETTING(    0x20, DEF_STR( Hard ) )             /* "DIFFICULT" */
 //  PORT_DIPSETTING(    0x30, DEF_STR( Normal ) )
-	PORT_DIPUNUSED( 0x0040, IP_ACTIVE_HIGH )
-	PORT_DIPUNUSED( 0x0080, IP_ACTIVE_HIGH )
+	PORT_DIPUNUSED( 0x40, IP_ACTIVE_HIGH )
+	PORT_DIPUNUSED( 0x80, IP_ACTIVE_HIGH )
 	PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_COIN1 ) PORT_IMPULSE(1)     /* needed to avoid credits getting mad */
 INPUT_PORTS_END
 
+/* verified from M68000 code */
+INPUT_PORTS_START( ssgbl )
+	PORT_INCLUDE( md_common )
+
+	PORT_MODIFY("PAD1")
+	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1) PORT_NAME("P1 Shoot") // a
+	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1) PORT_NAME("P1 Jump") // b
+	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_UNUSED ) // c (duplicate shoot button)
+	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_START1 ) // start
+
+	PORT_MODIFY("PAD2")
+	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2) PORT_NAME("P1 Shoot") // a
+	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2) PORT_NAME("P1 Jump") // b
+	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_UNUSED ) // c (duplicate shoot button)
+	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_START2 )
+
+	PORT_START("IN0")		/* 3rd I/O port */
+	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_COIN1 )
+	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_COIN2 )
+
+	PORT_START("DSWA")
+	PORT_DIPNAME( 0x07, 0x00, DEF_STR( Coinage ) )
+	PORT_DIPSETTING(    0x01, DEF_STR( 4C_1C ) )
+	PORT_DIPSETTING(    0x02, DEF_STR( 3C_1C ) )
+	PORT_DIPSETTING(    0x03, DEF_STR( 2C_1C ) )
+	PORT_DIPSETTING(    0x00, DEF_STR( 1C_1C ) )
+	PORT_DIPSETTING(    0x07, DEF_STR( 1C_2C ) )
+	PORT_DIPSETTING(    0x06, DEF_STR( 1C_3C ) )
+	PORT_DIPSETTING(    0x05, DEF_STR( 1C_4C ) )
+	PORT_DIPSETTING(    0x04, DEF_STR( 1C_5C ) )
+
+	PORT_START("DSWB")
+	PORT_DIPNAME( 0x03, 0x03, DEF_STR( Difficulty ) )
+	PORT_DIPSETTING(    0x03, DEF_STR( Easy ) )
+	PORT_DIPSETTING(    0x02, DEF_STR( Medium ) )
+	PORT_DIPSETTING(    0x01, DEF_STR( Hard ) )
+	PORT_DIPSETTING(    0x00, DEF_STR( Hardest ) )
+
+	PORT_START("DSWC")
+	PORT_DIPNAME( 0x03, 0x03, DEF_STR( Lives ) )
+	PORT_DIPSETTING(    0x03, "3" )
+	PORT_DIPSETTING(    0x02, "4" )
+	PORT_DIPSETTING(    0x01, "5" )
+	PORT_DIPSETTING(    0x00, "6" )
+INPUT_PORTS_END
+
 UINT8 megadrive_io_data_regs[3];
 UINT8 megadrive_io_ctrl_regs[3];
 static UINT8 megadrive_io_tx_regs[3];
diff --git a/src/mame/drivers/ssf2md.c b/src/mame/drivers/ssf2md.c
index af7290623d4..cc390d7a9b7 100644
--- a/src/mame/drivers/ssf2md.c
+++ b/src/mame/drivers/ssf2md.c
@@ -30,4 +30,4 @@ static DRIVER_INIT( ssf2ghw )
 
 }
 
-GAME( 1994, ssf2ghw,  0,   megadriv,    ssf2ghw,     ssf2ghw,  ROT0,   "bootleg / Capcom", "Super Street Fighter II - The New Challengers (Arcade bootleg of Japanese MegaDrive version)", 0 )
+GAME( 1994, ssf2ghw,  0, megadriv, ssf2ghw,  ssf2ghw,  ROT0, "bootleg / Capcom", "Super Street Fighter II - The New Challengers (Arcade bootleg of Japanese MegaDrive version)", 0 )
diff --git a/src/mame/drivers/ssgbl.c b/src/mame/drivers/ssgbl.c
index 90480f992d0..99ed110b679 100644
--- a/src/mame/drivers/ssgbl.c
+++ b/src/mame/drivers/ssgbl.c
@@ -3,8 +3,6 @@
 
 /* Sunset Riders bootleg - based on Genesis / Megadrive version
 
- - coinage system is protected?  (by what?)
-
  - title raster effect is broken (bug in megadrive code, happens with normal set too)
 
  */
@@ -18,57 +16,52 @@ ROM_START( ssgbl )
 ROM_END
 
 
-static READ16_HANDLER( sunsetbl_r )
+static READ16_HANDLER( ssgbl_dsw_r )
 {
-	return mame_rand(space->machine);
+	static const char *const dswname[3] = { "DSWA", "DSWB", "DSWC" };
+	return input_port_read(space->machine, dswname[offset]);
 }
 
-static READ16_HANDLER( sunsetbl2_r )
+static DRIVER_INIT( ssgbl )
 {
-	return 0x0000;//mame_rand(space->machine);
-}
-
-static DRIVER_INIT( sunsetbl )
-{
-	int i;
+	int x;
 	UINT8* rom = memory_region(machine, "maincpu");
 
 	/* todo, reduce bitswaps to single swap */
-	for (i=0x00001;i<0x40000;i+=2)
+	for (x=0x00001;x<0x40000;x+=2)
 	{
-		rom[i] = rom[i] ^ 0xff;
-		rom[i] = BITSWAP8(rom[i], 7,6,5,4,3,2,1,0 );
-		rom[i] = BITSWAP8(rom[i], 1,6,5,4,3,2,7,0 );
-		rom[i] = BITSWAP8(rom[i], 7,6,5,3,4,2,1,0 );
-		rom[i] = BITSWAP8(rom[i], 7,6,5,2,3,4,1,0 );
-		rom[i] = BITSWAP8(rom[i], 5,6,7,4,3,2,1,0 );
-		rom[i] = BITSWAP8(rom[i], 7,5,6,4,3,2,1,0 );
+		rom[x] = rom[x] ^ 0xff;
+		rom[x] = BITSWAP8(rom[x], 7,6,5,4,3,2,1,0 );
+		rom[x] = BITSWAP8(rom[x], 1,6,5,4,3,2,7,0 );
+		rom[x] = BITSWAP8(rom[x], 7,6,5,3,4,2,1,0 );
+		rom[x] = BITSWAP8(rom[x], 7,6,5,2,3,4,1,0 );
+		rom[x] = BITSWAP8(rom[x], 5,6,7,4,3,2,1,0 );
+		rom[x] = BITSWAP8(rom[x], 7,5,6,4,3,2,1,0 );
 	}
 
-	for (i=0x40001;i<0x80000;i+=2)
+	for (x=0x40001;x<0x80000;x+=2)
 	{
-		rom[i] = BITSWAP8(rom[i], 7,6,5,4,3,2,1,0 );
-		rom[i] = BITSWAP8(rom[i], 7,6,1,4, 3,2,5,0);
-		rom[i] = BITSWAP8(rom[i], 7,6,5,4,0,2,1,3 );
-		rom[i] = BITSWAP8(rom[i], 2,6,5,4,3,7,1,0 );
-		rom[i] = BITSWAP8(rom[i], 7,6,5,0,3,2,1,4 );
-		rom[i] = BITSWAP8(rom[i], 7,6,5,1,3,2,4,0 );
+		rom[x] = BITSWAP8(rom[x], 7,6,5,4,3,2,1,0 );
+		rom[x] = BITSWAP8(rom[x], 7,6,1,4,3,2,5,0 );
+		rom[x] = BITSWAP8(rom[x], 7,6,5,4,0,2,1,3 );
+		rom[x] = BITSWAP8(rom[x], 2,6,5,4,3,7,1,0 );
+		rom[x] = BITSWAP8(rom[x], 7,6,5,0,3,2,1,4 );
+		rom[x] = BITSWAP8(rom[x], 7,6,5,1,3,2,4,0 );
 
 	}
 
-	memory_install_read16_handler(cputag_get_address_space(machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0x770070, 0x77007f, 0, 0, sunsetbl_r);
-	memory_install_read16_handler(cputag_get_address_space(machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0xa10006, 0xa10007, 0, 0, sunsetbl2_r); // coins??
-
-	/* patch the startup and boot vector?! */
-	rom[0x01] = 0x00;
-	rom[0x00] = 0xff;
-	rom[0x03] = 0xff;
+	// boot vectors don't seem to be valid, so they are patched...
+	rom[0x01] = 0x01;
+	rom[0x00] = 0x00;
+	rom[0x03] = 0x00;
 	rom[0x02] = 0x00;
 
 	rom[0x06] = 0xd2;
 	rom[0x07] = 0x00;
 
+	memory_install_read16_handler(cputag_get_address_space(machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0x770070, 0x770075, 0, 0, ssgbl_dsw_r );
+
 	DRIVER_INIT_CALL(megadriv);
 }
 
-GAME( 1993, ssgbl ,  0,   megadriv,    megadriv,       sunsetbl,  ROT0,   "bootleg", "Sunset Riders (bootleg of Megadrive version)", GAME_NOT_WORKING) // playable, but coin system is broken
+GAME( 1993, ssgbl,    0, megadriv, ssgbl,    ssgbl,    ROT0, "bootleg", "Sunset Riders (bootleg of Megadrive version)", 0)
diff --git a/src/mame/includes/megadriv.h b/src/mame/includes/megadriv.h
index edeee6a6996..036fd83e749 100644
--- a/src/mame/includes/megadriv.h
+++ b/src/mame/includes/megadriv.h
@@ -13,6 +13,7 @@ extern DRIVER_INIT( mpnew );
 INPUT_PORTS_EXTERN( md_common );
 INPUT_PORTS_EXTERN( megadriv );
 INPUT_PORTS_EXTERN( aladbl );
+INPUT_PORTS_EXTERN( ssgbl );
 INPUT_PORTS_EXTERN( megadri6 );
 INPUT_PORTS_EXTERN( ssf2ghw );
 INPUT_PORTS_EXTERN( mk3ghw );