diff --git a/src/mame/drivers/blktiger.c b/src/mame/drivers/blktiger.c
index e56da45096f..72883f2436c 100644
--- a/src/mame/drivers/blktiger.c
+++ b/src/mame/drivers/blktiger.c
@@ -253,12 +253,12 @@ static MACHINE_START( blktiger )
 static MACHINE_DRIVER_START( blktiger )
 
 	/* basic machine hardware */
-	MDRV_CPU_ADD(Z80, 4000000)	/* 4 MHz (?) */
+	MDRV_CPU_ADD(Z80, XTAL_24MHz/4)	/* verified on pcb */
 	MDRV_CPU_PROGRAM_MAP(mem_map, 0)
 	MDRV_CPU_IO_MAP(port_map, 0)
 	MDRV_CPU_VBLANK_INT("main", irq0_line_hold)
 
-	MDRV_CPU_ADD(Z80, 3000000)
+	MDRV_CPU_ADD(Z80, XTAL_3_579545MHz) /* verified on pcb */
 	/* audio CPU */
 	MDRV_CPU_PROGRAM_MAP(sound_mem_map, 0)
 
@@ -284,11 +284,11 @@ static MACHINE_DRIVER_START( blktiger )
 	/* sound hardware */
 	MDRV_SPEAKER_STANDARD_MONO("mono")
 
-	MDRV_SOUND_ADD(YM2203, 3579545)
+	MDRV_SOUND_ADD(YM2203, XTAL_3_579545MHz) /* verified on pcb */
 	MDRV_SOUND_CONFIG(ym2203_interface)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.15)
 
-	MDRV_SOUND_ADD(YM2203, 3579545)
+	MDRV_SOUND_ADD(YM2203, XTAL_3_579545MHz) /* verified on pcb */
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.15)
 MACHINE_DRIVER_END