diff --git a/src/mame/drivers/taito_b.c b/src/mame/drivers/taito_b.c
index 7d29398fc8e..ef5f7392076 100644
--- a/src/mame/drivers/taito_b.c
+++ b/src/mame/drivers/taito_b.c
@@ -1979,11 +1979,11 @@ void taitob_state::machine_reset()
 static MACHINE_CONFIG_START( rastsag2, taitob_state )
 
 	/* basic machine hardware */
-	MCFG_CPU_ADD("maincpu", M68000, 12000000)   /* 12 MHz */
+	MCFG_CPU_ADD("maincpu", M68000, XTAL_24MHz/2)   /* 12 MHz */
 	MCFG_CPU_PROGRAM_MAP(rastsag2_map)
 	MCFG_CPU_VBLANK_INT_DRIVER("screen", taitob_state,  rastansaga2_interrupt)
 
-	MCFG_CPU_ADD("audiocpu", Z80, 4000000)  /* 4 MHz */
+	MCFG_CPU_ADD("audiocpu", Z80, XTAL_24MHz/6)  /* 4 MHz */
 	MCFG_CPU_PROGRAM_MAP(sound_map)
 
 	MCFG_QUANTUM_TIME(attotime::from_hz(600))
@@ -2010,7 +2010,7 @@ static MACHINE_CONFIG_START( rastsag2, taitob_state )
 	/* sound hardware */
 	MCFG_SPEAKER_STANDARD_MONO("mono")
 
-	MCFG_SOUND_ADD("ymsnd", YM2610, 8000000)
+	MCFG_SOUND_ADD("ymsnd", YM2610, XTAL_16MHz/2)
 	MCFG_YM2610_IRQ_HANDLER(WRITELINE(taitob_state, irqhandler))
 	MCFG_SOUND_ROUTE(0, "mono", 0.25)
 	MCFG_SOUND_ROUTE(1, "mono", 1.0)