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-rw-r--r--src/mame/drivers/subsino.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/mame/drivers/subsino.cpp b/src/mame/drivers/subsino.cpp
index 629849a48e6..331eb20bde6 100644
--- a/src/mame/drivers/subsino.cpp
+++ b/src/mame/drivers/subsino.cpp
@@ -2696,7 +2696,9 @@ void subsino_state::victor21(machine_config &config)
i8255_device &ppi(I8255A(config, "ppi"));
ppi.out_pa_callback().set(FUNC(subsino_state::out_a_w));
+ ppi.tri_pa_callback().set_constant(0);
ppi.out_pb_callback().set(FUNC(subsino_state::out_b_w));
+ ppi.tri_pb_callback().set_constant(0);
ppi.in_pc_callback().set_ioport("INC");
TICKET_DISPENSER(config, m_hopper, attotime::from_msec(200), TICKET_MOTOR_ACTIVE_HIGH, TICKET_STATUS_ACTIVE_LOW);