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r36326 Sunday 8th March, 2015 at 22:09:40 UTC by David Haywood
ok, register layout is different and it can do wider address range, so not quite a drop-in, and will need more work, but still seems to be related (nw)

[src/emu/machine]

am9517a.c am9517a.h

trunk/src/emu/machine/am9517a.c

r244837	r244838
54	54	//  MACROS / CONSTANTS
55	55	//**************************************************************************
56	56
57		#define LOG 0
	57	#define LOG 1
58	58
59	59
60	60	enum
r244837	r244838
360	360	if (MODE_ADDRESS_DECREMENT)
361	361	{
362	362	m_channel[m_current_channel].m_address--;
	363	m_channel[m_current_channel].m_address &= m_address_mask;
363	364
364	365	if ((m_channel[m_current_channel].m_address & 0xff) == 0xff)
365	366	{
r244837	r244838
369	370	else
370	371	{
371	372	m_channel[m_current_channel].m_address++;
	373	m_channel[m_current_channel].m_address &= m_address_mask;
372	374
373	375	if ((m_channel[m_current_channel].m_address & 0xff) == 0x00)
374	376	{
r244837	r244838
585	587	save_item(NAME(m_channel[i].m_base_count), i);
586	588	save_item(NAME(m_channel[i].m_mode), i);
587	589	}
	590
	591	m_address_mask = 0xffff;
	592
588	593	}
589	594
	595	void upd71071_v53_device::device_start()
	596	{
	597	am9517a_device::device_start();
	598	m_address_mask = 0x00ffffff;
	599	}
590	600
591	601	//-------------------------------------------------
592	602	//  device_reset - device-specific reset
r244837	r244838
776	786	if (MODE_ADDRESS_DECREMENT)
777	787	{
778	788	m_channel[m_current_channel].m_address--;
	789	m_channel[m_current_channel].m_address &= m_address_mask;
779	790	}
780	791	else
781	792	{
782	793	m_channel[m_current_channel].m_address++;
	794	m_channel[m_current_channel].m_address &= m_address_mask;
783	795	}
784	796
785	797	break;
r244837	r244838
1062	1074	{
1063	1075	dma_request(3, state);
1064	1076	}
	1077
	1078	//-------------------------------------------------
	1079	//  upd71071 register layouts
	1080	//-------------------------------------------------
	1081
	1082	READ8_MEMBER(upd71071_v53_device::read)
	1083	{
	1084	//   printf("upd71071_v53_device read %02x\n", offset);
	1085	return 0x00;
	1086	}
	1087
	1088	WRITE8_MEMBER(upd71071_v53_device::write)
	1089	{
	1090	//   printf("upd71071_v53_device write %02x %02x\n", offset, data);
	1091	}
		No newline at end of file

trunk/src/emu/machine/am9517a.h

r244837	r244838
75	75	template<class _Object> static devcb_base &set_out_dack_2_callback(device_t &device, _Object object) { return downcast<am9517a_device &>(device).m_out_dack_2_cb.set_callback(object); }
76	76	template<class _Object> static devcb_base &set_out_dack_3_callback(device_t &device, _Object object) { return downcast<am9517a_device &>(device).m_out_dack_3_cb.set_callback(object); }
77	77
78		DECLARE_READ8_MEMBER( read );
79		DECLARE_WRITE8_MEMBER( write );
	78	virtual DECLARE_READ8_MEMBER( read );
	79	virtual DECLARE_WRITE8_MEMBER( write );
80	80
81	81	DECLARE_WRITE_LINE_MEMBER( hack_w );
82	82	DECLARE_WRITE_LINE_MEMBER( ready_w );
r244837	r244838
94	94	virtual void execute_run();
95	95
96	96	int m_icount;
	97	UINT32 m_address_mask;
97	98
98	99	private:
99	100	inline void dma_request(int channel, int state);
r244837	r244838
129	130
130	131	struct
131	132	{
132		UINT16 m_address;
	133	UINT32 m_address;
133	134	UINT16 m_count;
134		UINT16 m_base_address;
	135	UINT32 m_base_address;
135	136	UINT16 m_base_count;
136	137	UINT8 m_mode;
137	138	} m_channel[4];
138	139
	140
139	141	int m_msb;
140	142	int m_hreq;
141	143	int m_hack;
r244837	r244838
157	159	public:
158	160	// construction/destruction
159	161	upd71071_v53_device(const machine_config &mconfig,  const char *tag, device_t *owner, UINT32 clock);
	162
	163	virtual DECLARE_READ8_MEMBER( read );
	164	virtual DECLARE_WRITE8_MEMBER( write );
	165
	166	protected:
	167	// device-level overrides
	168	virtual void device_start();
160	169	};
161	170
162	171

https://github.com/mamedev/mame/commit/37b68453bad69916eaddd599c6094d771f3f0e38

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