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(MESS) Apple II: Add volume control register to DX-1 card. [R. Belmont]

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This commit is contained in:
R. Belmont 2014-07-01 02:29:36 +00:00
parent 8b285d1e81
commit 937ebdc824
2 changed files with 11 additions and 1 deletions
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9
src/emu/bus/a2bus/a2dx1.c
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@ -70,10 +70,14 @@ void a2bus_dx1_device::device_start()
{
// set_a2bus_device makes m_slot valid
set_a2bus_device();
save_item(NAME(m_volume));
save_item(NAME(m_lastdac));
}
void a2bus_dx1_device::device_reset()
{
m_volume = m_lastdac = 0;
}
UINT8 a2bus_dx1_device::read_c0nx(address_space &space, UINT8 offset)
@ -98,10 +102,13 @@ void a2bus_dx1_device::write_c0nx(address_space &space, UINT8 offset, UINT8 data
switch (offset)
{
case 5: // volume
m_volume = data;
m_dac->write_unsigned16(data*m_lastdac);
break;
case 6:
m_dac->write_unsigned8(data);
m_lastdac = data;
m_dac->write_unsigned16(data*m_volume);
break;
}
}

3
src/emu/bus/a2bus/a2dx1.h
View File

@ -41,6 +41,9 @@ protected:
virtual UINT8 read_c0nx(address_space &space, UINT8 offset);
virtual void write_c0nx(address_space &space, UINT8 offset, UINT8 data);
virtual bool take_c800();
private:
UINT8 m_volume, m_lastdac;
};
// device type definition