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avalnche.c
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C/C++ Source or Header
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2000-04-04
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5KB
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191 lines
/***************************************************************************
Atari Avalanche Driver
Memory Map:
0000-1FFF RAM
2000-2FFF R INPUTS
3000-3FFF W WATCHDOG
4000-4FFF W OUTPUTS
5000-5FFF W SOUND LEVEL
6000-7FFF R PROGRAM ROM
8000-DFFF UNUSED
E000-FFFF PROGRAM ROM (Remapped)
If you have any questions about how this driver works, don't hesitate to
ask. - Mike Balfour (mab22@po.cwru.edu)
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
/* machine/avalnche.c */
READ_HANDLER( avalnche_input_r );
WRITE_HANDLER( avalnche_output_w );
WRITE_HANDLER( avalnche_noise_amplitude_w );
int avalnche_interrupt(void);
/* vidhrdw/avalnche.c */
WRITE_HANDLER( avalnche_videoram_w );
void avalnche_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);
static struct MemoryReadAddress readmem[] =
{
{ 0x0000, 0x1fff, MRA_RAM }, /* RAM SEL */
{ 0x2000, 0x2fff, avalnche_input_r }, /* INSEL */
{ 0x6000, 0x7fff, MRA_ROM }, /* ROM1-ROM2 */
{ 0xe000, 0xffff, MRA_ROM }, /* ROM2 for 6502 vectors */
{ -1 } /* end of table */
};
static struct MemoryWriteAddress writemem[] =
{
{ 0x0000, 0x1fff, avalnche_videoram_w, &videoram, &videoram_size }, /* DISPLAY */
{ 0x3000, 0x3fff, MWA_NOP }, /* WATCHDOG */
{ 0x4000, 0x4fff, avalnche_output_w }, /* OUTSEL */
{ 0x5000, 0x5fff, avalnche_noise_amplitude_w }, /* SOUNDLVL */
{ 0x6000, 0x7fff, MWA_ROM }, /* ROM1-ROM2 */
{ 0xe000, 0xffff, MWA_ROM }, /* ROM1-ROM2 */
{ -1 } /* end of table */
};
INPUT_PORTS_START( avalnche )
PORT_START /* IN0 */
PORT_BIT (0x03, IP_ACTIVE_HIGH, IPT_UNKNOWN ) /* Spare */
PORT_DIPNAME( 0x0c, 0x04, DEF_STR( Coinage ) )
PORT_DIPSETTING( 0x08, DEF_STR( 2C_1C ) )
PORT_DIPSETTING( 0x04, DEF_STR( 1C_1C ) )
PORT_DIPSETTING( 0x0c, DEF_STR( 1C_2C ) )
PORT_DIPSETTING( 0x00, DEF_STR( Free_Play ) )
PORT_DIPNAME( 0x30, 0x00, "Language" )
PORT_DIPSETTING( 0x00, "English" )
PORT_DIPSETTING( 0x30, "German" )
PORT_DIPSETTING( 0x20, "French" )
PORT_DIPSETTING( 0x10, "Spanish" )
PORT_BIT (0x40, IP_ACTIVE_HIGH, IPT_START2 )
PORT_BIT (0x80, IP_ACTIVE_HIGH, IPT_START1 )
PORT_START /* IN1 */
PORT_BIT ( 0x01, IP_ACTIVE_HIGH, IPT_COIN1 )
PORT_BIT ( 0x02, IP_ACTIVE_HIGH, IPT_COIN2 )
PORT_DIPNAME( 0x04, 0x04, "Allow Extended Play" )
PORT_DIPSETTING( 0x00, DEF_STR( No ) )
PORT_DIPSETTING( 0x04, DEF_STR( Yes ) )
PORT_DIPNAME( 0x08, 0x00, "Lives/Extended Play" )
PORT_DIPSETTING( 0x00, "3/450 points" )
PORT_DIPSETTING( 0x08, "5/750 points" )
PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN ) /* SLAM */
PORT_BITX( 0x20, IP_ACTIVE_HIGH, IPT_SERVICE | IPF_TOGGLE, DEF_STR ( Service_Mode ), KEYCODE_F2, IP_JOY_NONE )
PORT_BIT ( 0x40, IP_ACTIVE_HIGH, IPT_BUTTON1 ) /* Serve */
PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_VBLANK ) /* VBLANK */
PORT_START /* IN2 */
PORT_ANALOG( 0xff, 0x00, IPT_PADDLE, 50, 10, 0x40, 0xb7 )
INPUT_PORTS_END
static unsigned char palette[] =
{
0x00,0x00,0x00, /* BLACK */
0xff,0xff,0xff, /* WHITE */
};
static void init_palette(unsigned char *game_palette, unsigned short *game_colortable,const unsigned char *color_prom)
{
memcpy(game_palette,palette,sizeof(palette));
}
static struct DACinterface dac_interface =
{
2,
{ 100, 100 },
};
static struct MachineDriver machine_driver_avalnche =
{
/* basic machine hardware */
{
{
CPU_M6502,
12096000/16, /* clock input is the "2H" signal divided by two */
readmem,writemem,0,0,
avalnche_interrupt,32 /* interrupt at a 4V frequency for sound */
}
},
60, DEFAULT_REAL_60HZ_VBLANK_DURATION, /* frames per second, vblank duration */
1, /* single CPU, no need for interleaving */
0,
/* video hardware */
32*8, 32*8, { 0*8, 32*8-1, 2*8, 32*8-1 },
0,
sizeof(palette) / sizeof(palette[0]) / 3, 0,
init_palette,
VIDEO_TYPE_RASTER,
0,
0,
0,
avalnche_vh_screenrefresh,
/* sound hardware */
0,0,0,0,
{
{
SOUND_DAC,
&dac_interface
}
}
};
/***************************************************************************
Game ROMs
***************************************************************************/
ROM_START( avalnche )
ROM_REGION( 0x10000, REGION_CPU1 ) /* 64k for code */
/* Note: These are being loaded into a bogus location, */
/* They are nibble wide rom images which will be */
/* merged and loaded into the proper place by */
/* orbit_rom_init() */
ROM_LOAD( "30612.d2", 0x8800, 0x0800, 0x3f975171 )
ROM_LOAD( "30613.e2", 0x9000, 0x0800, 0x47a224d3 )
ROM_LOAD( "30611.c2", 0x9800, 0x0800, 0x0ad07f85 )
ROM_LOAD( "30615.d3", 0xa800, 0x0800, 0x3e1a86b4 )
ROM_LOAD( "30616.e3", 0xb000, 0x0800, 0xf620f0f8 )
ROM_LOAD( "30614.c3", 0xb800, 0x0800, 0xa12d5d64 )
ROM_END
static void init_avalnche(void)
{
unsigned char *rom = memory_region(REGION_CPU1);
int i;
/* Merge nibble-wide roms together,
and load them into 0x6000-0x7fff and e000-ffff */
for(i=0;i<0x2000;i++)
{
rom[0x6000+i] = (rom[0x8000+i]<<4)+rom[0xA000+i];
rom[0xE000+i] = (rom[0x8000+i]<<4)+rom[0xA000+i];
}
}
GAME( 1978, avalnche, 0, avalnche, avalnche, avalnche, ROT0, "Atari", "Avalanche" )