diff --git a/src/mame/drivers/hyhoo.c b/src/mame/drivers/hyhoo.c
index 16a3a792c75..62a50c165c6 100644
--- a/src/mame/drivers/hyhoo.c
+++ b/src/mame/drivers/hyhoo.c
@@ -255,7 +255,7 @@ static const ay8910_interface ay8910_config =
 static MACHINE_DRIVER_START( hyhoo )
 
 	/* basic machine hardware */
-	MDRV_CPU_ADD("maincpu", Z80, 5000000/1)	/* 5.00 MHz ?? */
+	MDRV_CPU_ADD("maincpu", Z80, 5000000)	/* 5.00 MHz ?? */
 	MDRV_CPU_PROGRAM_MAP(hyhoo_map)
 	MDRV_CPU_IO_MAP(hyhoo_io_map)
 	MDRV_CPU_VBLANK_INT("screen", nb1413m3_interrupt)
diff --git a/src/mame/drivers/nbmj9195.c b/src/mame/drivers/nbmj9195.c
index c11f3021536..10bac6632d9 100644
--- a/src/mame/drivers/nbmj9195.c
+++ b/src/mame/drivers/nbmj9195.c
@@ -2931,13 +2931,13 @@ static MACHINE_DRIVER_START( NBMJDRV1 )
 	MDRV_CPU_IO_MAP(sailorws_io_map)
 	MDRV_CPU_VBLANK_INT("screen", ctc0_trg1)				/* vblank is connect to ctc triggfer */
 
-	MDRV_CPU_ADD("audiocpu", Z80, 8000000/1)					/* TMPZ84C011, 8.00 MHz */
+	MDRV_CPU_ADD("audiocpu", Z80, 8000000)					/* TMPZ84C011, 8.00 MHz */
 	MDRV_CPU_CONFIG(daisy_chain_sound)
 	MDRV_CPU_PROGRAM_MAP(sailorws_sound_map)
 	MDRV_CPU_IO_MAP(sailorws_sound_io_map)
 
 	MDRV_Z80CTC_ADD("main_ctc", 12000000/2 /* same as "maincpu" */, ctc_intf_main)
-	MDRV_Z80CTC_ADD("audio_ctc", 8000000/1 /* same as "audiocpu" */, ctc_intf_audio)
+	MDRV_Z80CTC_ADD("audio_ctc", 8000000 /* same as "audiocpu" */, ctc_intf_audio)
 
 	MDRV_MACHINE_RESET(sailorws)
 
diff --git a/src/mame/drivers/niyanpai.c b/src/mame/drivers/niyanpai.c
index cfbb03985e5..adfa5f9d1d4 100644
--- a/src/mame/drivers/niyanpai.c
+++ b/src/mame/drivers/niyanpai.c
@@ -783,12 +783,12 @@ static MACHINE_DRIVER_START( niyanpai )
 	MDRV_CPU_PROGRAM_MAP(niyanpai_map)
 	MDRV_CPU_VBLANK_INT("screen", niyanpai_interrupt)
 
-	MDRV_CPU_ADD("audiocpu", Z80, 8000000/1)					/* TMPZ84C011, 8.00 MHz */
+	MDRV_CPU_ADD("audiocpu", Z80, 8000000)					/* TMPZ84C011, 8.00 MHz */
 	MDRV_CPU_CONFIG(daisy_chain_sound)
 	MDRV_CPU_PROGRAM_MAP(niyanpai_sound_map)
 	MDRV_CPU_IO_MAP(niyanpai_sound_io_map)
 
-	MDRV_Z80CTC_ADD("ctc", 8000000/1 /* same as "audiocpu" */, ctc_intf)
+	MDRV_Z80CTC_ADD("ctc", 8000000 /* same as "audiocpu" */, ctc_intf)
 
 	MDRV_MACHINE_RESET(niyanpai)
 	MDRV_NVRAM_HANDLER(generic_0fill)