diff --git a/src/emu/diserial.c b/src/emu/diserial.c
index 07748830eb5..95e8c43ebd8 100644
--- a/src/emu/diserial.c
+++ b/src/emu/diserial.c
@@ -1,3 +1,4 @@
+
 /***************************************************************************
 
         Serial device interface
@@ -78,7 +79,7 @@ void device_serial_interface::set_tra_rate(int baud)
 	m_tra_clock->adjust(attotime::never);
 }
 
-void device_serial_interface::tra_timer(void *ptr, int param)
+void device_serial_interface::tra_clock()
 {
 	tra_callback();
 	if(is_transmit_register_empty())
@@ -88,7 +89,12 @@ void device_serial_interface::tra_timer(void *ptr, int param)
 	}
 }
 
-void device_serial_interface::rcv_timer(void *ptr, int param)
+void device_serial_interface::tra_timer(void *ptr, int param)
+{
+	tra_clock();
+}
+
+void device_serial_interface::rcv_clock()
 {
 	rcv_callback();
 	if(is_receive_register_full())
@@ -98,6 +104,11 @@ void device_serial_interface::rcv_timer(void *ptr, int param)
 	}
 }
 
+void device_serial_interface::rcv_timer(void *ptr, int param)
+{
+	rcv_clock();
+}
+
 void device_serial_interface::set_data_frame(int num_data_bits, int stop_bit_count, int parity_code)
 {
 	m_df_word_length = num_data_bits;
diff --git a/src/emu/diserial.h b/src/emu/diserial.h
index 5c3d788431c..0f765d99602 100644
--- a/src/emu/diserial.h
+++ b/src/emu/diserial.h
@@ -93,6 +93,8 @@ public:
 
 	void set_rcv_rate(int baud);
 	void set_tra_rate(int baud);
+	void tra_clock();
+	void rcv_clock();
 
 	void transmit_register_reset();
 	void transmit_register_add_bit(int bit);