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r15067 Monday 30th April, 2012 at 06:47:59 UTC by Barry Rodewald
amstrad: Put CRTC and palette writes behind a short timer. This fixes video timing glitches in numerous games.

[src/mess/machine]

amstrad.c

src/mess/machine/amstrad.c

r15066	r15067
577	577	amstrad_plus_dma_parse( machine, 2 );
578	578	}
579	579
	580	static TIMER_CALLBACK(amstrad_video_update_timer)
	581	{
	582	if(param == 1)
	583	amstrad_plus_update_video(machine);
	584	else
	585	amstrad_update_video(machine);
	586	}
580	587
581	588	/* Set the new colour from the GateArray */
582	589	static void amstrad_vh_update_colour(running_machine &machine, int PenIndex, UINT16 hw_colour_index)
r15066	r15067
586	593	{
587	594	int val;
588	595
589		amstrad_plus_update_video( machine );
	596	machine.scheduler().timer_set( attotime::from_usec(1), FUNC(amstrad_video_update_timer),1);
590	597
591	598	/* CPC+/GX4000 - normal palette changes through the Gate Array also makes the corresponding change in the ASIC palette */
592	599	val = (amstrad_palette[hw_colour_index] & 0xf00000) >> 16; /* red */
r15066	r15067
597	604	}
598	605	else
599	606	{
600		amstrad_update_video( machine );
	607	machine.scheduler().timer_set( attotime::from_usec(1), FUNC(amstrad_video_update_timer),0);
601	608	}
602	609	state->m_GateArray_render_colours[PenIndex] = hw_colour_index;
603	610	}
r15066	r15067
606	613	static void aleste_vh_update_colour(running_machine &machine, int PenIndex, UINT16 hw_colour_index)
607	614	{
608	615	amstrad_state *state = machine.driver_data<amstrad_state>();
609		amstrad_update_video( machine );
	616	machine.scheduler().timer_set( attotime::from_usec(1), FUNC(amstrad_video_update_timer),0);
610	617	state->m_GateArray_render_colours[PenIndex] = hw_colour_index+32;
611	618	}
612	619
r15066	r15067
630	637	amstrad_state *state = machine.driver_data<amstrad_state>();
631	638	attotime now = machine.time();
632	639
	640
633	641	if ( state->m_gate_array.draw_p )
634	642	{
635	643	UINT32 cycles_passed = (now - state->m_gate_array.last_draw_time ).as_ticks(XTAL_16MHz);
r15066	r15067
1962	1970	m_prev_data = data;
1963	1971	}
1964	1972
1965
1966	1973	/* Offset handler for write */
1967	1974	WRITE8_MEMBER(amstrad_state::amstrad_cpc_io_w)
1968	1975	{
r15066	r15067
2006	2013	break;
2007	2014	case 0x01:      /* Write to selected internal 6845 register Write Only */
2008	2015	if ( m_system_type == SYSTEM_PLUS || m_system_type == SYSTEM_GX4000 )
2009		amstrad_plus_update_video(machine());
	2016	machine().scheduler().timer_set( attotime::from_usec(1), FUNC(amstrad_video_update_timer),1);
2010	2017	else
2011		amstrad_update_video(machine());
	2018	machine().scheduler().timer_set( attotime::from_usec(1), FUNC(amstrad_video_update_timer),0);
2012	2019	mc6845->register_w( space, 0, data );
2013	2020
2014	2021	/* printer port bit 8 */

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