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r8623 Sunday 25th July, 2010 at 16:49:51 UTC by Angelo Salese
[MULTI8]: Added vram banking, fixes text garbage on top. Added bitmap background

[src/mess/drivers]

multi8.c

src/mess/drivers/multi8.c

r8622	r8623
1	1	/***************************************************************************
2	2
3		Mitsubishi Multi 8
	3	Multi 8 (c) 1983 Mitsubishi
4	4
5		13/07/2010 Skeleton driver.
	5	preliminary driver by Angelo Salese
6	6
	7	TODO:
	8	- can't compile any code snippet out of BASIC, just single commands seems
	9	to work
	10
7	11	****************************************************************************/
8	12
9	13	#include "emu.h"
r8622	r8623
12	16	#include "video/mc6845.h"
13	17	#include "machine/i8255a.h"
14	18
15		static UINT8 *vram;
16	19	static UINT8 mcu_init;
17	20	static UINT8 keyb_press,keyb_press_flag,display_reg;
18	21	static UINT16 cursor_addr,cursor_raster;
	22	static UINT8 vram_bank;
19	23
20	24	static VIDEO_START( multi8 )
21	25	{
r8622	r8623
25	29	{
26	30	int x,y,count;
27	31	int x_width;
	32	int xi,yi;
	33	static UINT8 *vram = memory_region(screen->machine, "vram");
	34	static UINT8 *gfx_rom = memory_region(screen->machine, "chargen");
	35
28	36	count = 0x0000;
29	37
	38	x_width = (display_reg & 0x40) ? 640 : 320;
	39
	40	for(y=0;y<200;y++)
	41	{
	42	for(x=0;x<x_width;x+=8)
	43	{
	44	for(xi=0;xi<8;xi++)
	45	{
	46	int pen_r,pen_g,pen_b,color;
	47
	48	pen_b = (vram[count | 0x0000] >> (7-xi)) & 1;
	49	pen_r = (vram[count | 0x4000] >> (7-xi)) & 1;
	50	pen_g = (vram[count | 0x8000] >> (7-xi)) & 1;
	51
	52	color = (pen_b) | (pen_r << 1) | (pen_g << 2);
	53
	54	*BITMAP_ADDR16(bitmap, y, x+xi) = screen->machine->pens[color];
	55	}
	56	count++;
	57	}
	58	}
	59
30	60	x_width = (display_reg & 0x40) ? 80 : 40;
	61	count = 0xc000;
31	62
32	63	for(y=0;y<25;y++)
33	64	{
34	65	for(x=0;x<x_width;x++)
35	66	{
36	67	int tile = vram[count];
37		int color = vram[count+0x800] & 0x20;
	68	int color = (vram[count+0x800] & 0x38) >> 3;
38	69
39		drawgfx_opaque(bitmap, cliprect, screen->machine->gfx[0], tile,color >> 5, 0, 0, x*8, y*8);
	70	if(color == 0)
	71	color = 7;
40	72
	73	for(yi=0;yi<8;yi++)
	74	{
	75	for(xi=0;xi<8;xi++)
	76	{
	77	int pen;
	78
	79	pen = (gfx_rom[tile*8+yi] >> (7-xi) & 1) ? color : 0;
	80
	81	if(pen)
	82	*BITMAP_ADDR16(bitmap, y*8+yi, x*8+xi) = screen->machine->pens[pen];
	83	}
	84	}
	85
	86	//drawgfx_opaque(bitmap, cliprect, screen->machine->gfx[0], tile,color >> 5, 0, 0, x*8, y*8);
	87
41	88	// draw cursor
42		if(cursor_addr == count)
	89	if(cursor_addr+0xc000 == count)
43	90	{
44	91	int xc,yc,cursor_on;
45	92
r8622	r8623
58	105	{
59	106	for(xc=0;xc<8;xc++)
60	107	{
61		*BITMAP_ADDR16(bitmap, y*8+yc+7, x*8+xc) = screen->machine->pens[0x1];
	108	*BITMAP_ADDR16(bitmap, y*8+yc, x*8+xc) = screen->machine->pens[0x7];
62	109	}
63	110	}
64	111	}
65	112	}
	113
66	114	(display_reg & 0x40) ? count++ : count+=2;
67	115	}
68	116	}
r8622	r8623
109	157	return keyb_press_flag;
110	158	}
111	159
	160	static READ8_HANDLER( multi8_vram_r )
	161	{
	162	static UINT8 *vram = memory_region(space->machine, "vram");
	163	UINT8 res;
	164
	165	res = 0xff;
	166	if(!(vram_bank & 1)) { res &= vram[offset | 0x0000]; }
	167	if(!(vram_bank & 2)) { res &= vram[offset | 0x4000]; }
	168	if(!(vram_bank & 4)) { res &= vram[offset | 0x8000]; }
	169	if(!(vram_bank & 8)) { res &= vram[offset | 0xc000]; }
	170
	171	return res;
	172	}
	173
	174	static WRITE8_HANDLER( multi8_vram_w )
	175	{
	176	static UINT8 *vram = memory_region(space->machine, "vram");
	177
	178	if(!(vram_bank & 1)) { vram[offset | 0x0000] = data; }
	179	if(!(vram_bank & 2)) { vram[offset | 0x4000] = data; }
	180	if(!(vram_bank & 4)) { vram[offset | 0x8000] = data; }
	181	if(!(vram_bank & 8)) { vram[offset | 0xc000] = data; }
	182	}
	183
	184
112	185	static ADDRESS_MAP_START(multi8_mem, ADDRESS_SPACE_PROGRAM, 8)
113	186	ADDRESS_MAP_UNMAP_HIGH
114	187	AM_RANGE(0x0000, 0x7fff) AM_ROM
115		AM_RANGE(0x8000, 0x8fff) AM_RAM AM_BASE(&vram)
116		AM_RANGE(0x9000, 0xffff) AM_RAM
	188	AM_RANGE(0x8000, 0xbfff) AM_READWRITE( multi8_vram_r, multi8_vram_w )
	189	AM_RANGE(0xc000, 0xffff) AM_RAM
117	190	ADDRESS_MAP_END
118	191
119	192	static ADDRESS_MAP_START( multi8_io , ADDRESS_SPACE_IO, 8)
r8622	r8623
276	349	if(scancode >= 0x31 && scancode < 0x3a)
277	350	scancode -= 0x10;
278	351	if(scancode == 0x30)
279		{
280	352	scancode = 0x3d;
281		}
	353
	354	if(scancode == 0x3b)
	355	scancode = 0x2c;
	356
	357	if(scancode == 0x3a)
	358	scancode = 0x2e;
282	359	}
283	360	keyb_press = scancode;
284	361	keyb_press_flag = 1;
r8622	r8623
333	410
334	411	static PALETTE_INIT( multi8 )
335	412	{
336		palette_set_color_rgb(machine, 0, 0x00,0x00,0x00);
337		palette_set_color_rgb(machine, 1, 0xff,0xff,0xff);
338		palette_set_color_rgb(machine, 2, 0xff,0xff,0xff);
339		palette_set_color_rgb(machine, 3, 0x00,0x00,0x00);
	413	int i;
340	414
	415	for(i=0;i<8;i++)
	416	palette_set_color_rgb(machine, i, pal1bit(i >> 1),pal1bit(i >> 2),pal1bit(i >> 0));
341	417	}
342	418
343	419	static READ8_DEVICE_HANDLER( porta_r )
r8622	r8623
393	469	static WRITE8_DEVICE_HANDLER( portc_w )
394	470	{
395	471	//   printf("Port C w = %02x\n",data);
	472	vram_bank = data & 0xf;
	473
	474	//   if(data & 0x20)
	475	//      fatalerror("Work RAM bank selected");
396	476	}
397	477
398	478
r8622	r8623
424	504	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
425	505	MDRV_SCREEN_SIZE(640, 200)
426	506	MDRV_SCREEN_VISIBLE_AREA(0, 320-1, 0, 200-1)
427		MDRV_PALETTE_LENGTH(4)
	507	MDRV_PALETTE_LENGTH(8)
428	508	MDRV_PALETTE_INIT(multi8)
429	509	MDRV_GFXDECODE(multi8)
430	510
r8622	r8623
444	524	ROM_START( multi8 )
445	525	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
446	526	ROM_LOAD( "basic.rom", 0x0000, 0x8000, CRC(2131a3a8) SHA1(0f5a565ecfbf79237badbf9011dcb374abe74a57))
	527
447	528	ROM_REGION( 0x0800, "chargen", 0 )
448	529	ROM_LOAD( "font.rom",  0x0000, 0x0800, CRC(08f9ed0e) SHA1(57480510fb30af1372df5a44b23066ca61c6f0d9))
	530
	531	ROM_REGION( 0x10000, "vram", ROMREGION_ERASEFF )
449	532	ROM_END
450	533
451	534	/* Driver */

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