diff --git a/src/mame/drivers/starwars.c b/src/mame/drivers/starwars.c
index b11a43038df..2eb4ec79903 100644
--- a/src/mame/drivers/starwars.c
+++ b/src/mame/drivers/starwars.c
@@ -352,19 +352,19 @@ static MACHINE_DRIVER_START( starwars )
 	MDRV_SOUND_START(starwars)
 	MDRV_SPEAKER_STANDARD_MONO("mono")
 
-	MDRV_SOUND_ADD("pokey1", POKEY, 1500000)
+	MDRV_SOUND_ADD("pokey1", POKEY, MASTER_CLOCK / 8)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.20)
 
-	MDRV_SOUND_ADD("pokey2", POKEY, 1500000)
+	MDRV_SOUND_ADD("pokey2", POKEY, MASTER_CLOCK / 8)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.20)
 
-	MDRV_SOUND_ADD("pokey3", POKEY, 1500000)
+	MDRV_SOUND_ADD("pokey3", POKEY, MASTER_CLOCK / 8)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.20)
 
-	MDRV_SOUND_ADD("pokey4", POKEY, 1500000)
+	MDRV_SOUND_ADD("pokey4", POKEY, MASTER_CLOCK / 8)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.20)
 
-	MDRV_SOUND_ADD("tms", TMS5220, 640000)
+	MDRV_SOUND_ADD("tms", TMS5220, MASTER_CLOCK/2/9)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)
 MACHINE_DRIVER_END