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-rw-r--r--src/mame/video/madalien.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mame/video/madalien.cpp b/src/mame/video/madalien.cpp
index d4b1a1af312..ef244bf8c32 100644
--- a/src/mame/video/madalien.cpp
+++ b/src/mame/video/madalien.cpp
@@ -383,4 +383,5 @@ MACHINE_CONFIG_START(madalien_state::madalien_video)
MCFG_MC6845_ADD("crtc", MC6845, "screen", PIXEL_CLOCK / 8)
MCFG_MC6845_SHOW_BORDER_AREA(false)
MCFG_MC6845_CHAR_WIDTH(8)
+ MCFG_MC6845_OUT_VSYNC_CB(INPUTLINE("audiocpu", INPUT_LINE_NMI))
MACHINE_CONFIG_END