src/mess/drivers/xerox820.c
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| 4 | 4 | |
| 5 | 5 | 12/05/2009 Skeleton driver. |
| 6 | 6 | |
| 7 | The incoming key is expected to be placed at FF30 (might be interrupt driven) |
| 8 | |
| 7 | 9 | ****************************************************************************/ |
| 8 | 10 | |
| 9 | 11 | #include "driver.h" |
| 10 | 12 | #include "cpu/z80/z80.h" |
| 11 | 13 | |
| 14 | static const UINT8 *FNT; |
| 15 | |
| 16 | static READ8_HANDLER( xerox820_videoram_r ) |
| 17 | { |
| 18 | return videoram[offset]; |
| 19 | } |
| 20 | |
| 21 | static WRITE8_HANDLER( xerox820_videoram_w ) |
| 22 | { |
| 23 | videoram[offset] = data; |
| 24 | } |
| 25 | |
| 12 | 26 | static ADDRESS_MAP_START(xerox820_mem, ADDRESS_SPACE_PROGRAM, 8) |
| 13 | 27 | ADDRESS_MAP_UNMAP_HIGH |
| 28 | AM_RANGE( 0x0000, 0x0fff ) AM_ROM |
| 29 | AM_RANGE( 0x1000, 0x2fff ) AM_RAM |
| 30 | AM_RANGE( 0x3000, 0x3bff ) AM_READWRITE(xerox820_videoram_r,xerox820_videoram_w) AM_SIZE(&videoram_size) AM_BASE(&videoram) |
| 31 | AM_RANGE( 0x3c00, 0xffff ) AM_RAM |
| 14 | 32 | ADDRESS_MAP_END |
| 15 | 33 | |
| 16 | 34 | static ADDRESS_MAP_START( xerox820_io , ADDRESS_SPACE_IO, 8) |
| 17 | 35 | ADDRESS_MAP_UNMAP_HIGH |
| 36 | ADDRESS_MAP_GLOBAL_MASK(0xff) |
| 37 | /* IN 1C, OUT 7,C,14,18,1A,1B,1C,1D,1F */ |
| 18 | 38 | ADDRESS_MAP_END |
| 19 | 39 | |
| 20 | 40 | /* Input ports */ |
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| 28 | 48 | |
| 29 | 49 | static VIDEO_START( xerox820 ) |
| 30 | 50 | { |
| 51 | FNT = memory_region(machine, "gfx1"); |
| 31 | 52 | } |
| 32 | 53 | |
| 33 | 54 | static VIDEO_UPDATE( xerox820 ) |
| 34 | 55 | { |
| 35 | | return 0; |
| 56 | static UINT8 framecnt=0; |
| 57 | UINT8 y,ra,chr,gfx; |
| 58 | UINT16 sy=0,ma=0,x; |
| 59 | |
| 60 | framecnt++; |
| 61 | |
| 62 | for (y = 0; y < 24; y++) |
| 63 | { |
| 64 | for (ra = 0; ra < 10; ra++) |
| 65 | { |
| 66 | UINT16 *p = BITMAP_ADDR16(bitmap, sy++, 0); |
| 67 | |
| 68 | for (x = ma; x < ma + 80; x++) |
| 69 | { |
| 70 | if (ra < 8) |
| 71 | { |
| 72 | chr = videoram[x]^0x80; |
| 73 | |
| 74 | /* Take care of flashing characters */ |
| 75 | if ((chr < 0x80) && (framecnt & 0x08)) |
| 76 | chr |= 0x80; |
| 77 | |
| 78 | /* get pattern of pixels for that character scanline */ |
| 79 | gfx = FNT[(chr<<3) | ra ]; |
| 80 | } |
| 81 | else |
| 82 | gfx = 0xff; |
| 83 | |
| 84 | /* Display a scanline of a character (7 pixels) */ |
| 85 | *p = 0; p++; |
| 86 | *p = ( gfx & 0x10 ) ? 0 : 1; p++; |
| 87 | *p = ( gfx & 0x08 ) ? 0 : 1; p++; |
| 88 | *p = ( gfx & 0x04 ) ? 0 : 1; p++; |
| 89 | *p = ( gfx & 0x02 ) ? 0 : 1; p++; |
| 90 | *p = ( gfx & 0x01 ) ? 0 : 1; p++; |
| 91 | *p = 0; p++; |
| 92 | } |
| 93 | } |
| 94 | ma+=128; |
| 95 | } |
| 96 | return 0; |
| 36 | 97 | } |
| 37 | 98 | |
| 38 | 99 | static MACHINE_DRIVER_START( xerox820 ) |
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| 48 | 109 | MDRV_SCREEN_REFRESH_RATE(50) |
| 49 | 110 | MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */ |
| 50 | 111 | MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16) |
| 51 | | MDRV_SCREEN_SIZE(640, 480) |
| 52 | | MDRV_SCREEN_VISIBLE_AREA(0, 640-1, 0, 480-1) |
| 112 | MDRV_SCREEN_SIZE(80*7, 24*10) |
| 113 | MDRV_SCREEN_VISIBLE_AREA(0,80*7-1,0,24*10-1) |
| 53 | 114 | MDRV_PALETTE_LENGTH(2) |
| 54 | 115 | MDRV_PALETTE_INIT(black_and_white) |
| 55 | 116 | |
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| 62 | 123 | |
| 63 | 124 | /* ROM definition */ |
| 64 | 125 | ROM_START( xerox820 ) |
| 65 | | ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF ) |
| 66 | | ROM_LOAD( "x820_u63.bin", 0x0000, 0x0800, CRC(bc11f834) SHA1(4fd2b209a6e6ff9b0c41800eb5228c34a0d7f7ef)) |
| 67 | | ROM_LOAD( "x820_u64.bin", 0x0000, 0x0800, CRC(2fc227e2) SHA1(b4ea0ae23d281a687956e8a514cb364a1372678e)) |
| 68 | | ROM_LOAD( "x820_u92.bin", 0x0000, 0x0800, CRC(b823fa98) SHA1(ad0ea346aa257a53ad5701f4201896a2b3a0f928)) |
| 126 | ROM_REGION( 0x10000, "maincpu", 0 ) |
| 127 | ROM_LOAD( "x820_u64.bin", 0x0000, 0x0800, CRC(2fc227e2) SHA1(b4ea0ae23d281a687956e8a514cb364a1372678e)) |
| 128 | ROM_LOAD( "x820_u63.bin", 0x0800, 0x0800, CRC(bc11f834) SHA1(4fd2b209a6e6ff9b0c41800eb5228c34a0d7f7ef)) |
| 69 | 129 | |
| 130 | ROM_REGION( 0x800, "gfx1", 0 ) |
| 131 | ROM_LOAD( "x820_u92.bin", 0x0000, 0x0800, CRC(b823fa98) SHA1(ad0ea346aa257a53ad5701f4201896a2b3a0f928)) |
| 70 | 132 | ROM_END |
| 71 | 133 | |
| 72 | 134 | /* Driver */ |