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-rw-r--r--src/devices/machine/am9513.cpp12
1 files changed, 8 insertions, 4 deletions
diff --git a/src/devices/machine/am9513.cpp b/src/devices/machine/am9513.cpp
index 2ce1241e086..60f76e691c8 100644
--- a/src/devices/machine/am9513.cpp
+++ b/src/devices/machine/am9513.cpp
@@ -100,13 +100,17 @@ void am9513_device::device_start()
std::fill(std::begin(m_counter_armed), std::end(m_counter_armed), false);
std::fill(std::begin(m_counter_running), std::end(m_counter_running), false);
std::fill(std::begin(m_alternate_count), std::end(m_alternate_count), false);
- std::fill(std::begin(m_src), std::end(m_src), true);
- std::fill(std::begin(m_gate), std::end(m_gate), true);
- std::fill(std::begin(m_gate_alt), std::end(m_gate_alt), true);
- std::fill(std::begin(m_gate_active), std::end(m_gate_active), true);
std::fill(std::begin(m_tc), std::end(m_tc), false);
std::fill(std::begin(m_toggle), std::end(m_toggle), false);
+ // Unused SRC and GATE inputs are typically grounded
+ std::fill(std::begin(m_src), std::end(m_src), false);
+ std::fill(std::begin(m_gate), std::end(m_gate), false);
+ std::fill(std::begin(m_gate_active), std::end(m_gate_active), false);
+
+ // Alternate gate inputs should be tied high if not used
+ std::fill(std::begin(m_gate_alt), std::end(m_gate_alt), true);
+
// Set up frequency timers
for (int f = 0; f < 5; f++)
{