diff --git a/src/mame/sega/model2.cpp b/src/mame/sega/model2.cpp
index a433e22c3cc50..8198e258c10c8 100644
--- a/src/mame/sega/model2.cpp
+++ b/src/mame/sega/model2.cpp
@@ -144,6 +144,7 @@ void model2_state::machine_start()
 	debug_init();
 
 	m_lamps.resolve();
+	m_driveio_comm_out.resolve();
 	
 	save_item(NAME(m_intreq));
 	save_item(NAME(m_intena));
@@ -1577,6 +1578,7 @@ void model2_state::rchase2_drive_board_w(u8 data)
 
 void model2_state::drive_board_w(u8 data)
 {
+	m_driveio_comm_out = data;
 	m_driveio_comm_data = data;
 	if (m_drivecpu)
 		m_drivecpu->set_input_line(0, HOLD_LINE);
diff --git a/src/mame/sega/model2.h b/src/mame/sega/model2.h
index bd84f8d2e2367..e8e673254fd3e 100644
--- a/src/mame/sega/model2.h
+++ b/src/mame/sega/model2.h
@@ -73,7 +73,8 @@ class model2_state : public driver_device
 		m_in0(*this, "IN0"),
 		m_gears(*this, "GEARS"),
 		m_lightgun_ports(*this, {"P1_Y", "P1_X", "P2_Y", "P2_X"}),
-		m_lamps(*this, "lamp%u", 0U)		
+		m_lamps(*this, "lamp%u", 0U),
+		m_driveio_comm_out(*this, "driveio_comm")
 	{ }
 
 	/* Public for access by the rendering functions */
@@ -138,6 +139,7 @@ class model2_state : public driver_device
 	optional_ioport m_gears;
 	optional_ioport_array<4> m_lightgun_ports;
 	output_finder<6> m_lamps;
+	output_finder<> m_driveio_comm_out;
 	
 	u32 m_timervals[4]{};
 	u32 m_timerorig[4]{};