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-rw-r--r--src/mame/drivers/suprloco.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mame/drivers/suprloco.cpp b/src/mame/drivers/suprloco.cpp
index 21dadda23b5..0125c1bab1b 100644
--- a/src/mame/drivers/suprloco.cpp
+++ b/src/mame/drivers/suprloco.cpp
@@ -178,6 +178,7 @@ void suprloco_state::suprloco(machine_config &config)
i8255_device &ppi(I8255A(config, "ppi"));
ppi.out_pb_callback().set(FUNC(suprloco_state::control_w));
+ ppi.tri_pb_callback().set_constant(0);
ppi.out_pc_callback().set_output("lamp0").bit(0).invert(); // set by 8255 bit mode when no credits inserted
ppi.out_pc_callback().append_inputline(m_audiocpu, INPUT_LINE_NMI).bit(7).invert();