diff --git a/src/mame/drivers/bfcobra.cpp b/src/mame/drivers/bfcobra.cpp
index 7af75c64ae9..66b3481dad3 100644
--- a/src/mame/drivers/bfcobra.cpp
+++ b/src/mame/drivers/bfcobra.cpp
@@ -92,7 +92,7 @@
     Defines
 */
 #define Z80_XTAL    5910000     /* Unconfirmed */
-#define M6809_XTAL  1000000
+#define M6809_XTAL  4000000     /* Unconfirmed */
 
 
 
@@ -1633,7 +1633,7 @@ static MACHINE_CONFIG_START( bfcobra )
 	MCFG_CPU_IO_MAP(z80_io_map)
 	MCFG_CPU_VBLANK_INT_DRIVER("screen", bfcobra_state,  vblank_gen)
 
-	MCFG_CPU_ADD("audiocpu", M6809, M6809_XTAL)
+	MCFG_CPU_ADD("audiocpu", MC6809, M6809_XTAL) // MC6809P
 	MCFG_CPU_PROGRAM_MAP(m6809_prog_map)
 	MCFG_CPU_PERIODIC_INT_DRIVER(bfcobra_state, timer_irq, 1000)