diff --git a/src/mame/drivers/calomega.c b/src/mame/drivers/calomega.c
index d0ae423af26..8c952b99349 100644
--- a/src/mame/drivers/calomega.c
+++ b/src/mame/drivers/calomega.c
@@ -2664,7 +2664,7 @@ static MACHINE_CONFIG_START( sys903, calomega_state )
 	MCFG_DEVICE_ADD("acia6850_0", ACIA6850, 0)
 	MCFG_ACIA6850_TXD_HANDLER(WRITELINE(calomega_state, write_acia_tx))
 
-	MCFG_DEVICE_ADD("4024", CLOCK, UART_CLOCK)
+	MCFG_DEVICE_ADD("aciabaud", CLOCK, UART_CLOCK)
 	MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(calomega_state, write_acia_clock))
 MACHINE_CONFIG_END
 
@@ -2681,6 +2681,8 @@ static MACHINE_CONFIG_DERIVED( s903mod, sys903 )
 	MCFG_SOUND_CONFIG(sys905_ay8912_intf)
 
 	MCFG_DEVICE_REMOVE("acia6850_0")
+	
+	MCFG_DEVICE_REMOVE("aciabaud")
 MACHINE_CONFIG_END
 
 
@@ -2703,6 +2705,8 @@ static MACHINE_CONFIG_DERIVED( sys905, sys903 )
 	MCFG_SOUND_CONFIG(sys905_ay8912_intf)
 
 	MCFG_DEVICE_REMOVE("acia6850_0")
+	
+	MCFG_DEVICE_REMOVE("aciabaud")
 MACHINE_CONFIG_END
 
 
@@ -2733,6 +2737,8 @@ static MACHINE_CONFIG_DERIVED( sys906, sys903 )
 	MCFG_SOUND_CONFIG(sys906_ay8912_intf)
 
 	MCFG_DEVICE_REMOVE("acia6850_0")
+	
+	MCFG_DEVICE_REMOVE("aciabaud")
 MACHINE_CONFIG_END