diff --git a/src/mame/drivers/tecmo.c b/src/mame/drivers/tecmo.c
index d1e64099e94..d33075b1f7a 100644
--- a/src/mame/drivers/tecmo.c
+++ b/src/mame/drivers/tecmo.c
@@ -566,11 +566,11 @@ static const struct MSM5205interface msm5205_interface =
 static MACHINE_DRIVER_START( rygar )
 
 	/* basic machine hardware */
-	MDRV_CPU_ADD_TAG("main", Z80, 4000000)
+	MDRV_CPU_ADD_TAG("main", Z80, XTAL_24MHz/4) /* verified on pcb */
 	MDRV_CPU_PROGRAM_MAP(readmem,rygar_writemem)
 	MDRV_CPU_VBLANK_INT("main", irq0_line_hold)
 
-	MDRV_CPU_ADD_TAG("sound", Z80, 4000000)
+	MDRV_CPU_ADD_TAG("sound", Z80, XTAL_4MHz) /* verified on pcb */
 	/* audio CPU */
 	MDRV_CPU_PROGRAM_MAP(rygar_sound_readmem,rygar_sound_writemem)
 
@@ -591,11 +591,11 @@ static MACHINE_DRIVER_START( rygar )
 	/* sound hardware */
 	MDRV_SPEAKER_STANDARD_MONO("mono")
 
-	MDRV_SOUND_ADD(YM3812, 4000000)
+	MDRV_SOUND_ADD(YM3812, XTAL_4MHz) /* verified on pcb */
 	MDRV_SOUND_CONFIG(ym3812_interface)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
 
-	MDRV_SOUND_ADD(MSM5205, 384000)
+	MDRV_SOUND_ADD(MSM5205, XTAL_400kHz) /* verified on pcb, even if schematics shows a 384khz resonator */
 	MDRV_SOUND_CONFIG(msm5205_interface)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)
 MACHINE_DRIVER_END