diff --git a/src/mame/audio/exidy440.cpp b/src/mame/audio/exidy440.cpp
index ec0894613ad..d625f75f717 100644
--- a/src/mame/audio/exidy440.cpp
+++ b/src/mame/audio/exidy440.cpp
@@ -20,9 +20,9 @@
 #define FADE_TO_ZERO    1
 
 
-#define EXIDY440_AUDIO_CLOCK    (XTAL_12_9792MHz / 16)
-#define EXIDY440_MC3418_CLOCK   (EXIDY440_AUDIO_CLOCK / 16)
-#define EXIDY440_MC3417_CLOCK   (EXIDY440_AUDIO_CLOCK / 32)
+#define EXIDY440_AUDIO_CLOCK    (XTAL_12_9792MHz / 4)
+#define EXIDY440_MC3418_CLOCK   (EXIDY440_AUDIO_CLOCK / 4 / 16)
+#define EXIDY440_MC3417_CLOCK   (EXIDY440_AUDIO_CLOCK / 4 / 32)
 
 
 /* internal caching */
@@ -875,13 +875,13 @@ ADDRESS_MAP_END
 
 MACHINE_CONFIG_START( exidy440_audio )
 
-	MCFG_CPU_ADD("audiocpu", M6809, EXIDY440_AUDIO_CLOCK)
+	MCFG_CPU_ADD("audiocpu", MC6809, EXIDY440_AUDIO_CLOCK)
 	MCFG_CPU_PROGRAM_MAP(exidy440_audio_map)
 	MCFG_CPU_VBLANK_INT_DRIVER("screen", driver_device, irq0_line_assert)
 
 	MCFG_SPEAKER_STANDARD_STEREO("lspeaker", "rspeaker")
 
-	MCFG_SOUND_ADD("custom", EXIDY440, EXIDY440_AUDIO_CLOCK/16)
+	MCFG_SOUND_ADD("custom", EXIDY440, EXIDY440_MC3418_CLOCK)
 	MCFG_SOUND_ROUTE(0, "lspeaker", 1.0)
 	MCFG_SOUND_ROUTE(1, "rspeaker", 1.0)
 
diff --git a/src/mame/drivers/exidy440.cpp b/src/mame/drivers/exidy440.cpp
index 7b6ff76b66a..9132234065f 100644
--- a/src/mame/drivers/exidy440.cpp
+++ b/src/mame/drivers/exidy440.cpp
@@ -995,7 +995,7 @@ INPUT_PORTS_END
 static MACHINE_CONFIG_START( exidy440 )
 
 	/* basic machine hardware */
-	MCFG_CPU_ADD("maincpu", M6809, MAIN_CPU_CLOCK)
+	MCFG_CPU_ADD("maincpu", MC6809E, MAIN_CPU_CLOCK)
 	MCFG_CPU_PROGRAM_MAP(exidy440_map)
 	MCFG_CPU_VBLANK_INT_DRIVER("screen", exidy440_state,  exidy440_vblank_interrupt)