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-rw-r--r--src/devices/bus/s100/polyfdc.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/devices/bus/s100/polyfdc.cpp b/src/devices/bus/s100/polyfdc.cpp
index 8f6d885302b..962424324e0 100644
--- a/src/devices/bus/s100/polyfdc.cpp
+++ b/src/devices/bus/s100/polyfdc.cpp
@@ -121,4 +121,5 @@ void poly_fdc_device::device_add_mconfig(machine_config &config)
m_pio->out_pa_callback().set(FUNC(poly_fdc_device::pa_w));
m_pio->in_pb_callback().set(FUNC(poly_fdc_device::pb_r));
m_pio->out_pc_callback().set(FUNC(poly_fdc_device::pc_w));
+ m_pio->tri_pc_callback().set_constant(0xfe);
}