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-rw-r--r--src/devices/machine/am9513.cpp12
-rw-r--r--src/mame/drivers/ft68m.cpp7
2 files changed, 15 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++)
{
diff --git a/src/mame/drivers/ft68m.cpp b/src/mame/drivers/ft68m.cpp
index 9ca0f9fad49..c52e7f32865 100644
--- a/src/mame/drivers/ft68m.cpp
+++ b/src/mame/drivers/ft68m.cpp
@@ -32,6 +32,7 @@ public:
DECLARE_READ16_MEMBER(switches_r);
private:
+ virtual void machine_start() override;
virtual void machine_reset() override;
required_shared_ptr<uint16_t> m_p_base;
@@ -64,6 +65,12 @@ static INPUT_PORTS_START( ft68m )
INPUT_PORTS_END
+void ft68m_state::machine_start()
+{
+ // GATE 1 is tied to Vcc; other GATE and SRC pins are all grounded
+ subdevice<am9513_device>("stc")->gate1_w(1);
+}
+
void ft68m_state::machine_reset()
{
uint8_t* ROM = memregion("roms")->base();