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-rw-r--r--src/mame/drivers/intellect02.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mame/drivers/intellect02.cpp b/src/mame/drivers/intellect02.cpp
index 7b83669c247..3a2b9f731f0 100644
--- a/src/mame/drivers/intellect02.cpp
+++ b/src/mame/drivers/intellect02.cpp
@@ -239,6 +239,7 @@ void intel02_state::intel02(machine_config &config)
I8255(config, m_ppi8255);
m_ppi8255->in_pa_callback().set(FUNC(intel02_state::input_r));
m_ppi8255->out_pb_callback().set(FUNC(intel02_state::digit_w));
+ m_ppi8255->tri_pb_callback().set_constant(0);
m_ppi8255->out_pc_callback().set(FUNC(intel02_state::control_w));
m_ppi8255->tri_pc_callback().set_constant(0x80);