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AmigActive 10
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meteor.c
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C/C++ Source or Header
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2000-04-04
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9KB
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314 lines
/***************************************************************************
Meteoroids Memory Map
driver by Zsolt Vasvari
0000-3fff R ROM
4000-43ff R/W RAM
7000-7002 R input ports 0-2
7000-700f W most of the locations are unknown, but
7000 W sound command
7001 W sound CPU IRQ trigger on bit 3 falling edge
700e W main CPU interrupt enable (it uses RST7.5)
8000-83ff R/W bit 0-7 of character code
9000-93ff R/W attributes RAM
bit 0 - bit 8 of character code
bit 1-3 - unused
bit 4-6 - color
bit 7 - unused
a000-a3ff R/W X/Y scroll position of each character (can be scrolled up
to 7 pixels in each direction)
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
#include "cpu/i8085/i8085.h"
#include "cpu/i8039/i8039.h"
extern unsigned char *meteor_scrollram;
void meteor_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);
static int meteor_interrupt(void)
{
return I8085_RST75;
}
static int meteor_SN76496_latch;
static int meteor_SN76496_select;
static WRITE_HANDLER( meteor_SN76496_latch_w )
{
meteor_SN76496_latch = data;
}
static READ_HANDLER( meteor_SN76496_select_r )
{
return meteor_SN76496_select;
}
static WRITE_HANDLER( meteor_SN76496_select_w )
{
meteor_SN76496_select = data;
if (~data & 0x40) SN76496_0_w(0, meteor_SN76496_latch);
if (~data & 0x20) SN76496_1_w(0, meteor_SN76496_latch);
if (~data & 0x10) SN76496_2_w(0, meteor_SN76496_latch);
}
static READ_HANDLER( meteor_t0_r )
{
/* SN76496 status according to Al - not supported by MAME?? */
return rand() & 1;
}
static int meteor_soundtrigger;
static WRITE_HANDLER( meteor_soundtrigger_w )
{
if ((meteor_soundtrigger & 0x08) && (~data & 0x08))
{
cpu_cause_interrupt(1, I8039_EXT_INT);
}
meteor_soundtrigger = data;
}
static struct MemoryReadAddress readmem[] =
{
{ 0x0000, 0x3fff, MRA_ROM },
{ 0x4000, 0x43ff, MRA_RAM },
{ 0x7000, 0x7000, input_port_0_r },
{ 0x7001, 0x7001, input_port_1_r },
{ 0x7002, 0x7002, input_port_2_r },
{ 0x8000, 0x83ff, MRA_RAM },
{ 0x9000, 0x93ff, MRA_RAM },
{ 0xa000, 0xa3ff, MRA_RAM },
{ -1 } /* end of table */
};
static struct MemoryWriteAddress writemem[] =
{
{ 0x0000, 0x3fff, MWA_ROM },
{ 0x4000, 0x43ff, MWA_RAM },
{ 0x7000, 0x7000, soundlatch_w },
{ 0x7001, 0x7001, meteor_soundtrigger_w },
{ 0x700e, 0x700e, interrupt_enable_w },
{ 0x700f, 0x700f, MWA_NOP },
{ 0x8000, 0x83ff, MWA_RAM, &videoram, &videoram_size },
{ 0x9000, 0x93ff, MWA_RAM, &colorram },
{ 0xa000, 0xa3ff, MWA_RAM, &meteor_scrollram },
{ -1 } /* end of table */
};
static struct MemoryReadAddress sound_readmem[] =
{
{ 0x0000, 0x07ff, MRA_ROM },
{ -1 } /* end of table */
};
static struct MemoryWriteAddress sound_writemem[] =
{
{ 0x0000, 0x07ff, MWA_ROM },
{ -1 } /* end of table */
};
static struct IOReadPort sound_readport[] =
{
{ I8039_bus, I8039_bus, soundlatch_r },
{ I8039_p2, I8039_p2, meteor_SN76496_select_r },
{ I8039_t0, I8039_t0, meteor_t0_r },
{ -1 } /* end of table */
};
static struct IOWritePort sound_writeport[] =
{
{ I8039_p1, I8039_p1, meteor_SN76496_latch_w },
{ I8039_p2, I8039_p2, meteor_SN76496_select_w },
{ -1 } /* end of table */
};
INPUT_PORTS_START( meteor )
PORT_START /* DSW */
PORT_DIPNAME( 0x03, 0x02, DEF_STR( Coin_A ) )
PORT_DIPSETTING( 0x00, DEF_STR( 2C_1C ) )
PORT_DIPSETTING( 0x02, DEF_STR( 1C_1C ) )
PORT_DIPSETTING( 0x01, DEF_STR( 1C_2C ) )
PORT_DIPSETTING( 0x03, DEF_STR( Free_Play ) )
PORT_DIPNAME( 0x04, 0x00, DEF_STR( Coin_B ) )
PORT_DIPSETTING( 0x00, DEF_STR( 1C_3C ) )
PORT_DIPSETTING( 0x04, DEF_STR( 1C_6C ) )
PORT_DIPNAME( 0x18, 0x08, DEF_STR( Lives ) )
PORT_DIPSETTING( 0x00, "2" )
PORT_DIPSETTING( 0x08, "3" )
PORT_DIPSETTING( 0x10, "4" )
PORT_DIPSETTING( 0x18, "5" )
PORT_DIPNAME( 0x20, 0x20, DEF_STR( Bonus_Life ) )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x20, DEF_STR( On ) )
PORT_DIPNAME( 0x40, 0x00, DEF_STR( Unknown ) ) /* probably unused */
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x40, DEF_STR( On ) )
PORT_DIPNAME( 0x80, 0x00, DEF_STR( Unknown ) ) /* probably unused */
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x80, DEF_STR( On ) )
PORT_START /* IN0 */
PORT_BIT ( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_2WAY )
PORT_BIT ( 0x02, IP_ACTIVE_LOW, IPT_BUTTON1 )
PORT_BIT ( 0x04, IP_ACTIVE_LOW, IPT_COIN1 )
PORT_BIT ( 0x08, IP_ACTIVE_LOW, IPT_COIN2 )
PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_BUTTON2 )
PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_START2 )
PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_START1 )
PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT | IPF_2WAY )
PORT_START /* IN1 */
PORT_BITX( 0x08, IP_ACTIVE_LOW, IPT_SERVICE, DEF_STR( Service_Mode ), KEYCODE_F2, IP_JOY_NONE )
PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_VBLANK )
INPUT_PORTS_END
static struct GfxLayout charlayout =
{
8,8, /* 8*8 chars */
512, /* 512 characters */
3, /* 3 bits per pixel */
{ 2*512*8*8, 512*8*8, 0 }, /* The bitplanes are seperate */
{ 0, 1, 2, 3, 4, 5, 6, 7},
{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8},
8*8 /* every char takes 8 consecutive bytes */
};
static struct GfxDecodeInfo gfxdecodeinfo[] =
{
{ REGION_GFX1, 0, &charlayout, 0, 8 },
{ -1 } /* end of array */
};
/* 1-bit RGB palette */
static unsigned char palette[] =
{
0x00, 0x00, 0x00,
0xff, 0x00, 0x00,
0x00, 0xff, 0x00,
0xff, 0xff, 0x00,
0x00, 0x00, 0xff,
0xff, 0x00, 0xff,
0x00, 0xff, 0xff,
0xff, 0xff, 0xff
};
static unsigned short colortable[] =
{
0, 1, 2, 3, 4, 5, 6, 7,
0, 2, 3, 4, 5, 6, 7, 0, /* not sure about these, but they are only used */
0, 3, 4, 5, 6, 7, 0, 1, /* to change the text color. During the game, */
0, 4, 5, 6, 7, 0, 1, 2, /* only color 0 is used, which is correct. */
0, 5, 6, 7, 0, 1, 2, 3,
0, 6, 7, 0, 1, 2, 3, 4,
0, 7, 0, 1, 2, 3, 4, 5,
0, 0, 1, 2, 3, 4, 5, 6,
};
static void init_palette(unsigned char *game_palette, unsigned short *game_colortable,const unsigned char *color_prom)
{
memcpy(game_palette,palette,sizeof(palette));
memcpy(game_colortable,colortable,sizeof(colortable));
}
static struct SN76496interface sn76496_interface =
{
3, /* 3 chips */
{ 2000000, 2000000, 2000000 }, /* 8 MHz / 4 ?*/
{ 100, 100, 100 }
};
static struct MachineDriver machine_driver_meteor =
{
/* basic machine hardware */
{
{
CPU_8085A,
4000000, /* 4.00 MHz??? */
readmem,writemem,0,0,
meteor_interrupt,1
},
{
CPU_I8035 | CPU_AUDIO_CPU,
6144000/8, /* divisor ??? */
sound_readmem,sound_writemem,sound_readport,sound_writeport,
ignore_interrupt,0 /* IRQ's are triggered by the main CPU */
}
},
60, DEFAULT_REAL_60HZ_VBLANK_DURATION, /* frames per second, vblank duration */
1, /* 1 CPU slice per frame - interleaving is forced when a sound command is written */
0,
/* video hardware */
32*8, 32*8, { 0*8, 32*8-1, 0*8, 28*8-1 },
gfxdecodeinfo,
sizeof(palette) / sizeof(palette[0]) / 3, sizeof(colortable) / sizeof(colortable[0]),
init_palette,
VIDEO_TYPE_RASTER,
0,
generic_bitmapped_vh_start,
generic_bitmapped_vh_stop,
meteor_vh_screenrefresh,
/* sound hardware */
0,0,0,0,
{
{
SOUND_SN76496,
&sn76496_interface
}
}
};
/***************************************************************************
Game driver(s)
***************************************************************************/
ROM_START( meteor )
ROM_REGION( 0x10000, REGION_CPU1 ) /* 64k for code */
ROM_LOAD( "vm1", 0x0000, 0x0800, 0x894fe9b1 )
ROM_LOAD( "vm2", 0x0800, 0x0800, 0x28685a68 )
ROM_LOAD( "vm3", 0x1000, 0x0800, 0xc88fb12a )
ROM_LOAD( "vm4", 0x1800, 0x0800, 0xc5b073b9 )
/*0x2000- 0x27ff empty */
ROM_LOAD( "vm6", 0x2800, 0x0800, 0x9969ec43 )
ROM_LOAD( "vm7", 0x3000, 0x0800, 0x39f43ac2 )
ROM_LOAD( "vm8", 0x3800, 0x0800, 0xa0508de3 )
ROM_REGION( 0x1000, REGION_CPU2 ) /* sound MCU */
ROM_LOAD( "vm5", 0x0000, 0x0800, 0xb14ccd57 )
ROM_REGION( 0x3000, REGION_GFX1 | REGIONFLAG_DISPOSE )
ROM_LOAD( "rm1v", 0x0000, 0x0800, 0xd621fe96 )
ROM_LOAD( "rm2v", 0x0800, 0x0800, 0xb3981251 )
ROM_LOAD( "gm1v", 0x1000, 0x0800, 0xd44617e8 )
ROM_LOAD( "gm2v", 0x1800, 0x0800, 0x0997d945 )
ROM_LOAD( "bm1v", 0x2000, 0x0800, 0xcc97c890 )
ROM_LOAD( "bm2v", 0x2800, 0x0800, 0x2858cf5c )
ROM_END
GAME( 1981, meteor, 0, meteor, meteor, 0, ROT270, "Venture Line", "Meteoroids" )