MAME SVN History

199869 Revisions

r31030 Wednesday 18th June, 2014 at 21:17:35 UTC by Wilbert Pol
(MESS) msx.c: Internal ym2413s don't need the unlock sequence. (nw)

[src/emu/bus/msx_slot]

music.c music.h

trunk/src/emu/bus/msx_slot/music.c
r31029	r31030
9	9	: msx_slot_rom_device(mconfig, MSX_SLOT_MUSIC, "MSX Internal MSX-MUSIC", tag, owner, clock, "msx_slot_music", __FILE__)
10	10	, m_ym2413(NULL)
11	11	, m_ym2413_tag(NULL)
12		, m_opll_active(false)
13		, m_unlock(0)
14	12	{
15	13	}
16	14
r31029	r31030
37	35	}
38	36
39	37
40		void msx_slot_music_device::device_reset()
41		{
42		m_opll_active = false;
43		}
44
45
46	38	READ8_MEMBER(msx_slot_music_device::read)
47	39	{
48	40	return msx_slot_rom_device::read(space, offset);
49	41	}
50	42
51	43
52		WRITE8_MEMBER(msx_slot_music_device::write)
53		{
54		if (m_unlock == 0xbe && data == 0x41)
55		{
56		m_opll_active = true;
57		}
58		m_unlock = data;
59		}
60
61
62	44	WRITE8_MEMBER(msx_slot_music_device::write_ym2413)
63	45	{
64		if (m_opll_active)
65		{
66		m_ym2413->write(space, offset & 1, data);
67		}
	46	m_ym2413->write(space, offset & 1, data);
68	47	}
69	48

trunk/src/emu/bus/msx_slot/music.h
r31029	r31030
24	24	static void set_ym2413_tag(device_t &device, const char *tag) { dynamic_cast<msx_slot_music_device &>(device).m_ym2413_tag = tag; }
25	25
26	26	virtual void device_start();
27		virtual void device_reset();
28	27
29	28	virtual DECLARE_READ8_MEMBER(read);
30		virtual DECLARE_WRITE8_MEMBER(write);
31	29
32	30	DECLARE_WRITE8_MEMBER(write_ym2413);
33	31
34	32	private:
35	33	ym2413_device *m_ym2413;
36	34	const char *m_ym2413_tag;
37		bool m_opll_active;
38		UINT8 m_unlock;
39	35	};
40	36
41	37

199869 Revisions