MAME SVN History

199869 Revisions

r31151 Tuesday 1st July, 2014 at 02:29:36 UTC by R. Belmont
(MESS) Apple II: Add volume control register to DX-1 card. [R. Belmont]

[src/emu/bus/a2bus]

a2dx1.c a2dx1.h

trunk/src/emu/bus/a2bus/a2dx1.c
r31150	r31151
70	70	{
71	71	// set_a2bus_device makes m_slot valid
72	72	set_a2bus_device();
	73
	74	save_item(NAME(m_volume));
	75	save_item(NAME(m_lastdac));
73	76	}
74	77
75	78	void a2bus_dx1_device::device_reset()
76	79	{
	80	m_volume = m_lastdac = 0;
77	81	}
78	82
79	83	UINT8 a2bus_dx1_device::read_c0nx(address_space &space, UINT8 offset)
r31150	r31151
98	102	switch (offset)
99	103	{
100	104	case 5: // volume
	105	m_volume = data;
	106	m_dac->write_unsigned16(data*m_lastdac);
101	107	break;
102	108
103	109	case 6:
104		m_dac->write_unsigned8(data);
	110	m_lastdac = data;
	111	m_dac->write_unsigned16(data*m_volume);
105	112	break;
106	113	}
107	114	}

trunk/src/emu/bus/a2bus/a2dx1.h
r31150	r31151
41	41	virtual UINT8 read_c0nx(address_space &space, UINT8 offset);
42	42	virtual void write_c0nx(address_space &space, UINT8 offset, UINT8 data);
43	43	virtual bool take_c800();
	44
	45	private:
	46	UINT8 m_volume, m_lastdac;
44	47	};
45	48
46	49	// device type definition

199869 Revisions