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-rw-r--r--src/mame/drivers/dragon.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mame/drivers/dragon.cpp b/src/mame/drivers/dragon.cpp
index b21c5c39981..4e8a1f29148 100644
--- a/src/mame/drivers/dragon.cpp
+++ b/src/mame/drivers/dragon.cpp
@@ -274,6 +274,7 @@ void dragon_state::dragon_base(machine_config &config)
pia6821_device &pia0(PIA6821(config, PIA0_TAG, 0));
pia0.writepa_handler().set(FUNC(coco_state::pia0_pa_w));
pia0.writepb_handler().set(FUNC(coco_state::pia0_pb_w));
+ pia0.tspb_handler().set_constant(0xff);
pia0.ca2_handler().set(FUNC(coco_state::pia0_ca2_w));
pia0.cb2_handler().set(FUNC(coco_state::pia0_cb2_w));
pia0.irqa_handler().set(m_irqs, FUNC(input_merger_device::in_w<0>));