MESS SVN History

15994 Revisions

r1963 Wednesday 12th March, 2008 at 14:21:27 UTC by Dirk Best
[ASTROCDE] Simplified videoram access

src/mess/includes/astrocde.h
r1962	r1963
19	19
20	20	/----------- defined in video/astrocde.c -----------/
21	21
22		extern unsigned char *astrocade_videoram;
	22	PALETTE_INIT( astrocade );
	23	READ8_HANDLER( astrocade_intercept_r );
	24	WRITE8_HANDLER( astrocade_magic_expand_color_w );
	25	WRITE8_HANDLER( astrocade_magic_control_w );
	26	WRITE8_HANDLER( astrocade_magicram_w );
23	27
24		extern PALETTE_INIT( astrocade );
25		extern READ8_HANDLER( astrocade_intercept_r );
26		extern WRITE8_HANDLER( astrocade_videoram_w );
27		extern WRITE8_HANDLER( astrocade_magic_expand_color_w );
28		extern WRITE8_HANDLER( astrocade_magic_control_w );
29		extern WRITE8_HANDLER( astrocade_magicram_w );
	28	READ8_HANDLER( astrocade_video_retrace_r );
	29	WRITE8_HANDLER( astrocade_vertical_blank_w );
30	30
31		extern READ8_HANDLER( astrocade_video_retrace_r );
32		extern WRITE8_HANDLER( astrocade_vertical_blank_w );
	31	WRITE8_HANDLER( astrocade_mode_w );
33	32
34		WRITE8_HANDLER ( astrocade_mode_w );
	33	WRITE8_HANDLER( astrocade_colour_register_w );
	34	WRITE8_HANDLER( astrocade_colour_block_w );
	35	WRITE8_HANDLER( astrocade_colour_split_w );
35	36
36		WRITE8_HANDLER ( astrocade_colour_register_w );
37		WRITE8_HANDLER ( astrocade_colour_block_w );
38		WRITE8_HANDLER ( astrocade_colour_split_w );
39
40	37	VIDEO_UPDATE( astrocde );
41	38
42	39

src/mess/video/astrocde.c
r1962	r1963
19	19	#define VERBOSE 0
20	20	#define LOG(x) do { if (VERBOSE) logerror x; } while (0)
21	21
22		unsigned char *astrocade_videoram;
23	22	static int magic_expand_color, magic_control, magic_expand_flipflop, collision;
24	23
25	24	static int ColourSplit=0; /* Colour System vars */
r1962	r1963
191	190
192	191	}
193	192
194		WRITE8_HANDLER ( astrocade_videoram_w )
195		{
196		if ((offset < 0x1000) && (astrocade_videoram[offset] != data))
197		{
198		astrocade_videoram[offset] = data;
199		}
200		}
201	193
202
203	194	WRITE8_HANDLER ( astrocade_magic_expand_color_w )
204	195	{
205	196	//LOG(("%04x: magic_expand_color = %02x\n",cpu_getpc(),data));
r1962	r1963
312	303
313	304	if (magic_control & 0x30)
314	305	{
315		old_data = ~~astrocade_~~videoram[offset];
	306	old_data = videoram[offset];
316	307	collision &= 0x0f;
317	308
318	309	if (data \| old_data)
r1962	r1963
329	320	}
330	321
331	322	if (magic_control & XOR_MASK)
332		data ^= ~~astrocade_~~videoram[offset]; /* draw in XOR mode */
	323	data ^= videoram[offset]; /* draw in XOR mode */
333	324	else if (magic_control & OR_MASK)
334		data \|= ~~astrocade_~~videoram[offset]; /* draw in OR mode */
	325	data \|= videoram[offset]; /* draw in OR mode */
335	326
336	327	/* else draw in copy mode */
	328	videoram[offset] = data;
337	329
338		astrocade_videoram_w(machine, offset,data);
339
340	330	magic_expand_flipflop ^= 1;
341	331	}
342	332
r1962	r1963
366	356	for(i=0;i<num_bytes;i++,memloc++)
367	357	{
368	358	if (line < VerticalBlank)
369		data = ~~astrocade_~~videoram[memloc];
	359	data = videoram[memloc];
370	360	else
371	361	data = BackgroundData;
372	362

src/mess/drivers/astrocde.c
r1962	r1963
63	63	static ADDRESS_MAP_START( astrocade_mem, ADDRESS_SPACE_PROGRAM, 8 )
64	64	AM_RANGE(0x0000, 0x0fff) AM_READWRITE(MRA8_ROM, astrocade_magicram_w)
65	65	AM_RANGE(0x1000, 0x3fff) AM_ROM /* Star Fortress writes in here?? */
66		AM_RANGE(0x4000, 0x4fff) AM_REA~~DWRITE(~~M~~RA8_RAM,~~ ~~astrocade_videoram_w)~~ AM_BASE(&~~astrocade_~~videoram) AM_SIZE(&videoram_size) /* ASG */
	66	AM_RANGE(0x4000, 0x4fff) AM_RAM AM_BASE(&videoram) AM_SIZE(&videoram_size) /* ASG */
67	67	ADDRESS_MAP_END
68	68
69	69

15994 Revisions