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-rw-r--r--src/mame/drivers/lb4.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mame/drivers/lb4.cpp b/src/mame/drivers/lb4.cpp
index 3e50d948b14..c9b549b3098 100644
--- a/src/mame/drivers/lb4.cpp
+++ b/src/mame/drivers/lb4.cpp
@@ -140,6 +140,7 @@ void lb4_state::lb4(machine_config &config)
m_crtc->set_show_border_area(false);
m_crtc->set_char_width(8);
m_crtc->set_update_row_callback(FUNC(lb4_state::crtc_update_row), this);
+ m_crtc->out_vsync_callback().set_inputline(m_maincpu, M6800_IRQ_LINE);
ACIA6850(config, m_acia, 0);
m_acia->txd_handler().set("rs232", FUNC(rs232_port_device::write_txd));