diff --git a/src/mame/drivers/segas16b.c b/src/mame/drivers/segas16b.c
index bf8e2066f2a..ae8cf2c6d24 100644
--- a/src/mame/drivers/segas16b.c
+++ b/src/mame/drivers/segas16b.c
@@ -1870,10 +1870,10 @@ static INPUT_PORTS_START( aceattac )
 	PORT_BIT( 0xff, 0x80, IPT_AD_STICK_X ) PORT_SENSITIVITY(100) PORT_KEYDELTA(30) PORT_PLAYER(TMP_PL1HAND)
 
 	PORT_START("TRACKX1")
-	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_X ) PORT_SENSITIVITY(100) PORT_KEYDELTA(30) PORT_PLAYER(TMP_PL1BALL) PORT_REVERSE
+	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_X ) PORT_SENSITIVITY(100) PORT_KEYDELTA(10) PORT_PLAYER(TMP_PL1BALL)
 
 	PORT_START("TRACKY1")
-	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(100) PORT_KEYDELTA(30) PORT_PLAYER(TMP_PL1BALL)
+	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(100) PORT_KEYDELTA(10) PORT_PLAYER(TMP_PL1BALL)
 
 	PORT_START("HANDY1") // power of "hand" device
 	PORT_BIT( 0x7f, 0x40, IPT_PEDAL2 ) PORT_SENSITIVITY(100) PORT_KEYDELTA(10) PORT_CENTERDELTA(30) PORT_PLAYER(TMP_PL1HAND)
@@ -3379,7 +3379,7 @@ ROM_START( aceattac )
 	ROM_LOAD16_BYTE( "epr-11490.a2", 0x020001, 0x10000, CRC(38cb3a41) SHA1(1d74cc69907cdff2d85e965b80bf3f551465257e) )
 
 	ROM_REGION( 0x2000, "maincpu:key", 0 ) // decryption key
-	ROM_LOAD( "317-0059.key", 0x0000, 0x2000, NO_DUMP )
+	ROM_LOAD( "317-0059.key", 0x0000, 0x2000, CRC(14ce2a94) SHA1(bbf206311ac744c2b4845b33095c5a9bf8fe2014) )
 
 	ROM_REGION( 0x30000, "gfx1", 0 ) // tiles
 	ROM_LOAD( "epr-11493.b9",  0x00000, 0x10000, CRC(654485d9) SHA1(b431270564c4e33fd70c8c85af1fcbff8b59ba49) )
@@ -3389,11 +3389,11 @@ ROM_START( aceattac )
 	ROM_REGION16_BE( 0x80000, "sprites", 0 ) // sprites
 	ROM_LOAD16_BYTE( "epr-11501.b1", 0x00001, 0x10000, CRC(09179ead) SHA1(3e6bf04e1e9ea867d087a47ff04ad0a064a8e299) )
 	ROM_LOAD16_BYTE( "epr-11505.b5", 0x00000, 0x10000, CRC(b67f1ecf) SHA1(3a26cdf91e5a1a11c1a8857e713a9e00cc1bfce0) )
-	ROM_LOAD16_BYTE( "epr-11502.b2", 0x20001, 0x10000, CRC(a3ee36b8) SHA1(bc946ad67b8ad09d947465ab73160885a4a57be5) )
+	ROM_LOAD16_BYTE( "epr-11502.b2", 0x20001, 0x10000, CRC(7464bae4) SHA1(c6b6ca240cee72e7fbd17bad5ca2d5cfe8e835c6) )
 	ROM_LOAD16_BYTE( "epr-11506.b6", 0x20000, 0x10000, CRC(b0104def) SHA1(c81a66ec3a600c1d4c5d058caef15936c59b2574) )
 	ROM_LOAD16_BYTE( "epr-11503.b3", 0x40001, 0x10000, CRC(344c0692) SHA1(3125701f6bb91d8f64515e214b571e169c30a444) )
 	ROM_LOAD16_BYTE( "epr-11507.b7", 0x40000, 0x10000, CRC(a2af710a) SHA1(1c8b75b72797146c2eb788511f8cb1b367fc3e0d) )
-	ROM_LOAD16_BYTE( "epr-11504.b4", 0x60001, 0x10000, CRC(7cae7920) SHA1(9f00e01d7cc86a0bf4f84e78a56b7efbb97c5591) )
+	ROM_LOAD16_BYTE( "epr-11504.b4", 0x60001, 0x10000, CRC(42b4a5f8) SHA1(efb7beee7b45023861711f56b7cc907400cb266e) )
 	ROM_LOAD16_BYTE( "epr-11508.b8", 0x60000, 0x10000, CRC(5cbb833c) SHA1(dc7041b6a4fa75d050bfc2176d0f9e242b55a0b8) )
 
 	ROM_REGION( 0x50000, "soundcpu", 0 ) // sound CPU