src/mess/drivers/multi8.c
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| 1 | 1 | /*************************************************************************** |
| 2 | | |
| 2 | |
| 3 | 3 | Mitsubishi Multi 8 |
| 4 | 4 | |
| 5 | 5 | 13/07/2010 Skeleton driver. |
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| 8 | 8 | |
| 9 | 9 | #include "emu.h" |
| 10 | 10 | #include "cpu/z80/z80.h" |
| 11 | #include "sound/2203intf.h" |
| 12 | #include "video/mc6845.h" |
| 11 | 13 | |
| 14 | static VIDEO_START( multi8 ) |
| 15 | { |
| 16 | } |
| 17 | |
| 18 | static VIDEO_UPDATE( multi8 ) |
| 19 | { |
| 20 | return 0; |
| 21 | } |
| 22 | |
| 23 | static WRITE8_HANDLER( multi8_6845_w ) |
| 24 | { |
| 25 | static int addr_latch; |
| 26 | |
| 27 | if(offset == 0) |
| 28 | { |
| 29 | addr_latch = data; |
| 30 | mc6845_address_w(space->machine->device("crtc"), 0,data); |
| 31 | } |
| 32 | else |
| 33 | { |
| 34 | mc6845_register_w(space->machine->device("crtc"), 0,data); |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | |
| 12 | 39 | static ADDRESS_MAP_START(multi8_mem, ADDRESS_SPACE_PROGRAM, 8) |
| 13 | 40 | ADDRESS_MAP_UNMAP_HIGH |
| 14 | 41 | AM_RANGE(0x0000, 0x7FFF) AM_ROM |
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| 17 | 44 | |
| 18 | 45 | static ADDRESS_MAP_START( multi8_io , ADDRESS_SPACE_IO, 8) |
| 19 | 46 | ADDRESS_MAP_UNMAP_HIGH |
| 20 | | /* This is all a guess... ports used in the bootup process: |
| 21 | | in 00 = ascii code from the keyboard |
| 22 | | in 01 = is a key pressed? (bit 1) also bits 6 and 7 are used |
| 23 | | out 10 = unknown |
| 24 | | out 18, 19 = audio channel |
| 25 | | in 1A = unknown |
| 26 | | out 1C, 1D = possibly a mc6845 |
| 27 | | out 25, 26, 27, 2A, 2B, 2C, 2D, 30, 78 = unknown |
| 28 | | in 28 = unknown (bit 5 is a status line) */ |
| 47 | ADDRESS_MAP_GLOBAL_MASK(0xff) |
| 48 | |
| 49 | // AM_RANGE(0x00, 0x01) //keyboard line |
| 50 | AM_RANGE(0x18, 0x19) AM_DEVWRITE("ymsnd", ym2203_w) |
| 51 | // AM_RANGE(0x18, 0x18) //opn read 0 |
| 52 | // AM_RANGE(0x1a, 0x1a) //opn read 1 |
| 53 | AM_RANGE(0x1c, 0x1d) AM_WRITE(multi8_6845_w) |
| 54 | // AM_RANGE(0x20, 0x21) //sio, cmt |
| 55 | // AM_RANGE(0x24, 0x27) //pit |
| 56 | // AM_RANGE(0x28, 0x2b) //i8255 0 |
| 57 | // AM_RANGE(0x2c, 0x2d) //i8259 |
| 58 | // AM_RANGE(0x30, 0x37) //vdp regs |
| 59 | // AM_RANGE(0x40, 0x41) //kanji regs |
| 60 | // AM_RANGE(0x70, 0x74) //upd765a fdc |
| 29 | 61 | ADDRESS_MAP_END |
| 30 | 62 | |
| 31 | 63 | /* Input ports */ |
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| 33 | 65 | INPUT_PORTS_END |
| 34 | 66 | |
| 35 | 67 | |
| 36 | | static MACHINE_RESET(multi8) |
| 37 | | { |
| 38 | | } |
| 39 | | |
| 40 | | static VIDEO_START( multi8 ) |
| 68 | static MACHINE_RESET(multi8) |
| 41 | 69 | { |
| 42 | 70 | } |
| 43 | 71 | |
| 44 | | static VIDEO_UPDATE( multi8 ) |
| 45 | | { |
| 46 | | return 0; |
| 47 | | } |
| 48 | | |
| 49 | 72 | /* F4 Character Displayer */ |
| 50 | 73 | static const gfx_layout multi8_charlayout = |
| 51 | 74 | { |
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| 64 | 87 | GFXDECODE_ENTRY( "chargen", 0x0000, multi8_charlayout, 0, 1 ) |
| 65 | 88 | GFXDECODE_END |
| 66 | 89 | |
| 90 | static const mc6845_interface mc6845_intf = |
| 91 | { |
| 92 | "screen", /* screen we are acting on */ |
| 93 | 8, /* number of pixels per video memory address */ |
| 94 | NULL, /* before pixel update callback */ |
| 95 | NULL, /* row update callback */ |
| 96 | NULL, /* after pixel update callback */ |
| 97 | DEVCB_NULL, /* callback for display state changes */ |
| 98 | DEVCB_NULL, /* callback for cursor state changes */ |
| 99 | DEVCB_NULL, /* HSYNC callback */ |
| 100 | DEVCB_NULL, /* VSYNC callback */ |
| 101 | NULL /* update address callback */ |
| 102 | }; |
| 103 | |
| 104 | |
| 67 | 105 | static MACHINE_DRIVER_START( multi8 ) |
| 68 | 106 | /* basic machine hardware */ |
| 69 | 107 | MDRV_CPU_ADD("maincpu",Z80, XTAL_4MHz) |
| 70 | 108 | MDRV_CPU_PROGRAM_MAP(multi8_mem) |
| 71 | | MDRV_CPU_IO_MAP(multi8_io) |
| 109 | MDRV_CPU_IO_MAP(multi8_io) |
| 72 | 110 | |
| 73 | 111 | MDRV_MACHINE_RESET(multi8) |
| 74 | | |
| 112 | |
| 75 | 113 | /* video hardware */ |
| 76 | 114 | MDRV_SCREEN_ADD("screen", RASTER) |
| 77 | 115 | MDRV_SCREEN_REFRESH_RATE(50) |
| 78 | 116 | MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */ |
| 79 | 117 | MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16) |
| 80 | | MDRV_SCREEN_SIZE(640, 480) |
| 81 | | MDRV_SCREEN_VISIBLE_AREA(0, 640-1, 0, 480-1) |
| 118 | MDRV_SCREEN_SIZE(640, 200) |
| 119 | MDRV_SCREEN_VISIBLE_AREA(0, 640-1, 0, 200-1) |
| 82 | 120 | MDRV_PALETTE_LENGTH(2) |
| 83 | 121 | MDRV_PALETTE_INIT(black_and_white) |
| 84 | 122 | MDRV_GFXDECODE(multi8) |
| 85 | 123 | |
| 124 | MDRV_MC6845_ADD("crtc", H46505, XTAL_3_579545MHz/2, mc6845_intf) /* unknown clock, hand tuned to get ~60 fps */ |
| 125 | |
| 86 | 126 | MDRV_VIDEO_START(multi8) |
| 87 | 127 | MDRV_VIDEO_UPDATE(multi8) |
| 128 | |
| 129 | MDRV_SPEAKER_STANDARD_MONO("mono") |
| 130 | |
| 131 | MDRV_SOUND_ADD("ymsnd", YM2203, 1500000) //unknown clock / divider |
| 132 | // MDRV_SOUND_CONFIG(ym2203_config) |
| 133 | MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50) |
| 88 | 134 | MACHINE_DRIVER_END |
| 89 | 135 | |
| 90 | 136 | /* ROM definition */ |