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r19952 Sunday 30th December, 2012 at 20:14:04 UTC by Wilbert Pol
(MESS) odyssey2: Some small EF934x changes (nw)

[src/mess/includes]	odyssey2.h
[src/mess/machine]	odyssey2.c
[src/mess/video]	odyssey2.c

trunk/src/mess/includes/odyssey2.h

r19951	r19952
117	117	DECLARE_WRITE8_MEMBER(lum_write);
118	118	DECLARE_READ8_MEMBER(t1_read);
119	119	DECLARE_DRIVER_INIT(odyssey2);
	120	virtual void machine_start();
120	121	virtual void machine_reset();
121	122	virtual void video_start();
122	123	void video_start_g7400();
r19951	r19952
132	133	ef9341_t m_ef9341;
133	134	UINT8   m_ef934x_ram_a[1024];
134	135	UINT8   m_ef934x_ram_b[1024];
	136	UINT8   m_ef934x_ext_char_ram[1024];
135	137	bool   m_g7400;
136	138
137	139	inline UINT16 ef9340_get_c_addr();
138	140	inline void ef9340_inc_c();
	141	// Calculate the external chargen address for a character and slice
	142	inline UINT16 external_chargen_address(UINT8 b, UINT8 slice);
139	143
140	144	void i824x_scanline(int vpos);
141	145	void er9340_scanline(int vpos);

trunk/src/mess/video/odyssey2.c

r19951	r19952
721	721	return ( m_ef9340.Y << 5 ) | m_ef9340.X;
722	722	}
723	723
	724
724	725	void odyssey2_state::ef9340_inc_c()
725	726	{
726	727	m_ef9340.X++;
727	728	if ( m_ef9340.X >= 40 )
728	729	{
729	730	m_ef9340.Y = ( m_ef9340.Y + 1 ) % 24;
	731	m_ef9340.X = 0;
730	732	}
731	733	}
732	734
	735
	736	UINT16 odyssey2_state::external_chargen_address(UINT8 b, UINT8 slice)
	737	{
	738	UINT8 cc = b & 0x7f;
	739
	740	if ( slice & 8 )
	741	{
	742	// 0 0 CCE4 CCE3 CCE2 CCE1 CCE0 CCE6 CCE5 ADR0
	743	return ( ( cc << 3 ) & 0xf8 ) | ( ( cc >> 4 ) & 0x06) | ( slice & 0x01 );
	744	}
	745	// CCE6 CCE5 CCE4 CCE3 CCE2 CCE1 CCE0 ADR2 ADR1 ADR0
	746	return  ( cc << 3 ) | ( slice & 0x07 );
	747	}
	748
	749
733	750	void odyssey2_state::ef9341_w( UINT8 command, UINT8 b, UINT8 data )
734	751	{
735	752	logerror("ef9341 %s write, t%s, data %02X\n", command ? "command" : "data", b ? "B" : "A", data );
r19951	r19952
776	793	{
777	794	if ( b )
778	795	{
	796	UINT16 addr = ef9340_get_c_addr() & 0x3ff;
	797
779	798	m_ef9341.TB = data;
780	799	m_ef9341.busy = 0x80;
781	800	switch ( m_ef9340.M & 0xE0 )
782	801	{
783		case 0x00:   /* Write */
784		m_ef934x_ram_b[ ef9340_get_c_addr() & 0x3ff ] = m_ef9341.TB;
785		ef9340_inc_c();
786		break;
787		case 0x20:   /* Read */
788		logerror("ef9341 unimplemented data action %02X\n", m_ef9340.M & 0xE0 );
789		ef9340_inc_c();
790		break;
791		case 0x40:   /* Write without increment */
792		case 0x60:   /* Read without increment */
793		case 0x80:   /* Write slice */
794		case 0xA0:   /* Read slice */
795		logerror("ef9341 unimplemented data action %02X\n", m_ef9340.M & 0xE0 );
796		break;
	802	case 0x00:   /* Write */
	803	m_ef934x_ram_a[addr] = m_ef9341.TA;
	804	m_ef934x_ram_b[addr] = m_ef9341.TB;
	805	ef9340_inc_c();
	806	break;
	807
	808	case 0x20:   /* Read */
	809	m_ef9341.TA = m_ef934x_ram_a[addr];
	810	m_ef9341.TB = m_ef934x_ram_b[addr];
	811	ef9340_inc_c();
	812	break;
	813
	814	case 0x40:   /* Write without increment */
	815	m_ef934x_ram_a[addr] = m_ef9341.TA;
	816	m_ef934x_ram_b[addr] = m_ef9341.TB;
	817	break;
	818
	819	case 0x60:   /* Read without increment */
	820	m_ef9341.TA = m_ef934x_ram_a[addr];
	821	m_ef9341.TB = m_ef934x_ram_b[addr];
	822	break;
	823
	824	case 0x80:   /* Write slice */
	825	{
	826	UINT8 b = m_ef934x_ram_b[addr];
	827	UINT8 slice = ( m_ef9340.M & 0x0f ) % 10;
	828
	829	if ( b >= 0xa0 )
	830	{
	831	m_ef934x_ext_char_ram[ external_chargen_address( b, slice ) ] = m_ef9341.TA;
	832	}
	833
	834	// Increment slice number
	835	m_ef9340.M = ( m_ef9340.M & 0xf0) | ( ( slice + 1 ) % 10 );
	836	}
	837	break;
	838
	839	case 0xA0:   /* Read slice */
	840	fatalerror/*logerror*/("ef9341 unimplemented data action %02X\n", m_ef9340.M & 0xE0 );
	841	break;
797	842	}
798	843	m_ef9341.busy = 0;
799	844	}
r19951	r19952
825	870	if ( b )
826	871	{
827	872	data = m_ef9341.TB;
828		m_ef9341.busy = 0x80;
829	873	}
830	874	else
831	875	{

trunk/src/mess/machine/odyssey2.c

r19951	r19952
79	79	}
80	80
81	81
	82	void odyssey2_state::machine_start()
	83	{
	84	save_item(NAME(m_ef934x_ram_a));
	85	save_item(NAME(m_ef934x_ram_b));
	86	save_item(NAME(m_ef9340.X));
	87	save_item(NAME(m_ef9340.Y));
	88	save_item(NAME(m_ef9340.Y0));
	89	save_item(NAME(m_ef9340.R));
	90	save_item(NAME(m_ef9340.M));
	91	save_item(NAME(m_ef9341.TA));
	92	save_item(NAME(m_ef9341.TB));
	93	save_item(NAME(m_ef9341.busy));
	94	save_item(NAME(m_ef934x_ext_char_ram));
	95	}
	96
	97
82	98	void odyssey2_state::machine_reset()
83	99	{
84	100	/* jump to "last" bank, will work for all sizes due to being mirrored */

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