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exprraid.c
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C/C++ Source or Header
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2000-04-04
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18KB
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557 lines
/***************************************************************************
Express Raider - (c) 1986 Data East USA
Ernesto Corvi
ernesto@imagina.com
Memory Map:
Main CPU: ( 6502 )
0000-05ff RAM
0600-07ff Sprites
0800-0bff Videoram
0c00-0fff Colorram
1800-1800 DSW 0
1801-1801 Controls
1802-1802 Coins
1803-1803 DSW 1
2100-2100 Sound latch write
2800-2801 Protection
3800-3800 VBblank ( bootleg only )
4000-ffff MRA_ROM
Sound Cpu: ( 6809 )
0000-1fff RAM
2000-2001 YM2203
4000-4001 YM3526
6000-6000 Sound latch read
8000-ffff ROM
NOTES:
The main 6502 cpu is a custom one. The differences with a regular 6502 is as follows:
- Extra opcode ( $4b00 ), wich i think reads an external port. VBlank irq is on bit 1 ( 0x02 ).
- Reset, IRQ and NMI vectors are moved.
Also, there was some protection circuitry wich is now emulated.
The way i dealt with the custom opcode was to change it to return memory
position $ff (wich i verified is not used by the game). And i hacked in
a read handler wich returns the vblank on bit 1. It's an ugly hack, but
works fine.
The bootleg version patched the rom to get rid of the extra opcode ( bootlegs
used a regular 6502 ), the vectors hardcoded in place, and also had the
protection cracked.
The background tiles had a very ugly encoding. It was so ugly that our
decode gfx routine will not be able to decode it without some little help.
So thats why exprraid_gfx_expand() is there. Many thanks to Phil
Stroffolino, who figured out the encoding.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
#include "cpu/m6809/m6809.h"
/* from vidhrdw */
extern unsigned char *exprraid_bgcontrol;
void exprraid_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);
void exprraid_vh_convert_color_prom(unsigned char *palette, unsigned short *colortable,const unsigned char *color_prom);
/*****************************************************************************************/
/* Emulate Protection ( only for original express raider, code is cracked on the bootleg */
/*****************************************************************************************/
static READ_HANDLER( exprraid_prot_0_r )
{
unsigned char *RAM = memory_region(REGION_CPU1);
return RAM[0x02a9];
}
static READ_HANDLER( exprraid_prot_1_r )
{
return 0x02;
}
static WRITE_HANDLER( sound_cpu_command_w )
{
soundlatch_w(0,data);
cpu_cause_interrupt(1,M6809_INT_NMI);
}
static READ_HANDLER( vblank_r ) {
int val = readinputport( 0 );
if ( ( val & 0x02 ) )
cpu_spin();
return val;
}
static struct MemoryReadAddress readmem[] =
{
{ 0x00ff, 0x00ff, vblank_r }, /* HACK!!!! see init_exprraid below */
{ 0x0000, 0x05ff, MRA_RAM },
{ 0x0600, 0x07ff, MRA_RAM }, /* sprites */
{ 0x0800, 0x0bff, videoram_r },
{ 0x0c00, 0x0fff, colorram_r },
{ 0x1800, 0x1800, input_port_1_r }, /* DSW 0 */
{ 0x1801, 0x1801, input_port_2_r }, /* Controls */
{ 0x1802, 0x1802, input_port_3_r }, /* Coins */
{ 0x1803, 0x1803, input_port_4_r }, /* DSW 1 */
{ 0x2800, 0x2800, exprraid_prot_0_r }, /* protection */
{ 0x2801, 0x2801, exprraid_prot_1_r }, /* protection */
{ 0x3800, 0x3800, vblank_r }, /* vblank on bootleg */
{ 0x4000, 0xffff, MRA_ROM },
{ -1 } /* end of table */
};
static struct MemoryWriteAddress writemem[] =
{
{ 0x0000, 0x05ff, MWA_RAM },
{ 0x0600, 0x07ff, MWA_RAM, &spriteram, &spriteram_size }, /* sprites */
{ 0x0800, 0x0bff, videoram_w, &videoram, &videoram_size },
{ 0x0c00, 0x0fff, colorram_w, &colorram },
{ 0x2001, 0x2001, sound_cpu_command_w },
{ 0x2800, 0x2807, MWA_RAM, &exprraid_bgcontrol },
{ 0x4000, 0xffff, MWA_ROM },
{ -1 } /* end of table */
};
static struct MemoryReadAddress sub_readmem[] =
{
{ 0x0000, 0x1fff, MRA_RAM },
{ 0x2000, 0x2000, YM2203_status_port_0_r },
{ 0x2001, 0x2001, YM2203_read_port_0_r },
{ 0x4000, 0x4000, YM3526_status_port_0_r },
{ 0x6000, 0x6000, soundlatch_r },
{ 0x8000, 0xffff, MRA_ROM },
{ -1 } /* end of table */
};
static struct MemoryWriteAddress sub_writemem[] =
{
{ 0x0000, 0x1fff, MWA_RAM },
{ 0x2000, 0x2000, YM2203_control_port_0_w },
{ 0x2001, 0x2001, YM2203_write_port_0_w },
{ 0x4000, 0x4000, YM3526_control_port_0_w },
{ 0x4001, 0x4001, YM3526_write_port_0_w },
{ 0x8000, 0xffff, MWA_ROM },
{ -1 } /* end of table */
};
INPUT_PORTS_START( exprraid )
PORT_START /* IN 0 - 0x3800 */
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_VBLANK )
PORT_START /* DSW 0 - 0x1800 */
PORT_DIPNAME( 0x03, 0x03, DEF_STR( Coin_A ) )
PORT_DIPSETTING( 0x00, DEF_STR( 2C_1C ) )
PORT_DIPSETTING( 0x03, DEF_STR( 1C_1C ) )
PORT_DIPSETTING( 0x02, DEF_STR( 1C_2C ) )
PORT_DIPSETTING( 0x01, DEF_STR( 1C_3C ) )
PORT_DIPNAME( 0x0c, 0x0c, DEF_STR( Coin_B ) )
PORT_DIPSETTING( 0x00, DEF_STR( 2C_1C ) )
PORT_DIPSETTING( 0x0c, DEF_STR( 1C_1C ) )
PORT_DIPSETTING( 0x08, DEF_STR( 1C_2C ) )
PORT_DIPSETTING( 0x04, DEF_STR( 1C_3C ) )
PORT_DIPNAME( 0x10, 0x10, DEF_STR( Unknown ) )
PORT_DIPSETTING( 0x10, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_DIPNAME( 0x20, 0x20, DEF_STR( Flip_Screen ) )
PORT_DIPSETTING( 0x20, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_DIPNAME( 0x40, 0x00, DEF_STR( Cabinet ) )
PORT_DIPSETTING( 0x00, DEF_STR( Upright ) )
PORT_DIPSETTING( 0x40, DEF_STR( Cocktail ) )
PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unknown ) )
PORT_DIPSETTING( 0x80, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_START /* IN 1 - 0x1801 */
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_8WAY )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT | IPF_8WAY )
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_UP | IPF_8WAY )
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN | IPF_8WAY )
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 )
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_START1 )
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START2 )
PORT_START /* IN 2 - 0x1802 */
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN1 )
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_COIN2 )
PORT_START /* IN 3 - 0x1803 */
PORT_DIPNAME( 0x03, 0x03, DEF_STR( Lives ) )
PORT_DIPSETTING( 0x01, "1" )
PORT_DIPSETTING( 0x03, "3" )
PORT_DIPSETTING( 0x02, "5" )
PORT_BITX( 0, 0x00, IPT_DIPSWITCH_SETTING | IPF_CHEAT, "Infinite", IP_KEY_NONE, IP_JOY_NONE )
PORT_DIPNAME( 0x04, 0x04, DEF_STR( Bonus_Life ) )
PORT_DIPSETTING( 0x04, "Every 50000" )
PORT_DIPSETTING( 0x00, "50000 80000" )
PORT_DIPNAME( 0x18, 0x18, DEF_STR( Difficulty ) )
PORT_DIPSETTING( 0x10, "Easy" )
PORT_DIPSETTING( 0x18, "Normal" )
PORT_DIPSETTING( 0x08, "Hard" )
PORT_DIPSETTING( 0x00, "Hardest" )
PORT_DIPNAME( 0x20, 0x20, DEF_STR( Demo_Sounds ) )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x20, DEF_STR( On ) )
PORT_DIPNAME( 0x40, 0x40, DEF_STR( Unknown ) ) /* This one has to be set for coin up */
PORT_DIPSETTING( 0x40, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unknown ) )
PORT_DIPSETTING( 0x80, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
INPUT_PORTS_END
static struct GfxLayout charlayout =
{
8,8, /* 8*8 characters */
1024, /* 1024 characters */
2, /* 2 bits per pixel */
{ 0, 4 }, /* the bitplanes are packed in the same byte */
{ (0x2000*8)+0, (0x2000*8)+1, (0x2000*8)+2, (0x2000*8)+3, 0, 1, 2, 3 },
{ 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 GfxLayout spritelayout =
{
16,16, /* 16*16 sprites */
2048, /* 2048 sprites */
3, /* 3 bits per pixel */
{ 2*2048*32*8, 2048*32*8, 0 }, /* the bitplanes are separated */
{ 128+0, 128+1, 128+2, 128+3, 128+4, 128+5, 128+6, 128+7, 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, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
32*8 /* every char takes 32 consecutive bytes */
};
static struct GfxLayout tile1 =
{
16,16, /* 16*16 tiles */
128, /* 128 tiles */
3, /* 3 bits per pixel */
{ 4, 0x10000*8+0, 0x10000*8+4 },
{ 0, 1, 2, 3, 1024*32*2,1024*32*2+1,1024*32*2+2,1024*32*2+3,
128+0,128+1,128+2,128+3,128+1024*32*2,128+1024*32*2+1,128+1024*32*2+2,128+1024*32*2+3 }, /* BOGUS */
{ 0*8,1*8,2*8,3*8,4*8,5*8,6*8,7*8,
64+0*8,64+1*8,64+2*8,64+3*8,64+4*8,64+5*8,64+6*8,64+7*8 },
32*8
};
static struct GfxLayout tile2 =
{
16,16, /* 16*16 tiles */
128, /* 128 tiles */
3, /* 3 bits per pixel */
{ 0, 0x11000*8+0, 0x11000*8+4 },
{ 0, 1, 2, 3, 1024*32*2,1024*32*2+1,1024*32*2+2,1024*32*2+3,
128+0,128+1,128+2,128+3,128+1024*32*2,128+1024*32*2+1,128+1024*32*2+2,128+1024*32*2+3 }, /* BOGUS */
{ 0*8,1*8,2*8,3*8,4*8,5*8,6*8,7*8,
64+0*8,64+1*8,64+2*8,64+3*8,64+4*8,64+5*8,64+6*8,64+7*8 },
32*8
};
static struct GfxDecodeInfo gfxdecodeinfo[] =
{
{ REGION_GFX1, 0x00000, &charlayout, 128, 2 }, /* characters */
{ REGION_GFX2, 0x00000, &spritelayout, 64, 8 }, /* sprites */
{ REGION_GFX3, 0x00000, &tile1, 0, 4 }, /* background tiles */
{ REGION_GFX3, 0x00000, &tile2, 0, 4 },
{ REGION_GFX3, 0x04000, &tile1, 0, 4 },
{ REGION_GFX3, 0x04000, &tile2, 0, 4 },
{ REGION_GFX3, 0x08000, &tile1, 0, 4 },
{ REGION_GFX3, 0x08000, &tile2, 0, 4 },
{ REGION_GFX3, 0x0c000, &tile1, 0, 4 },
{ REGION_GFX3, 0x0c000, &tile2, 0, 4 },
{ -1 } /* end of array */
};
/* handler called by the 3812 emulator when the internal timers cause an IRQ */
static void irqhandler(int linestate)
{
cpu_set_irq_line(1,0,linestate);
//cpu_cause_interrupt(1,0xff);
}
static struct YM2203interface ym2203_interface =
{
1, /* 1 chip */
1500000, /* 1.5 MHz ??? */
{ YM2203_VOL(30,30) },
{ 0 },
{ 0 },
{ 0 },
{ 0 }
};
static struct YM3526interface ym3526_interface =
{
1, /* 1 chip (no more supported) */
3600000, /* 3.600000 MHz ? (partially supported) */
{ 30 }, /* volume */
{ irqhandler }
};
static int exprraid_interrupt(void)
{
static int coin = 0;
if ( ( ~readinputport( 3 ) ) & 0xc0 ) {
if ( coin == 0 ) {
coin = 1;
return nmi_interrupt();
}
} else
coin = 0;
return ignore_interrupt();
}
static struct MachineDriver machine_driver_exprraid =
{
/* basic machine hardware */
{
{
CPU_M6502,
4000000, /* 4 Mhz ??? */
readmem,writemem,0,0,
exprraid_interrupt, 1
},
{
CPU_M6809,
2000000, /* 2 Mhz ??? */
sub_readmem,sub_writemem,0,0,
ignore_interrupt,0 /* NMIs are caused by the main CPU */
/* IRQs are caused by the YM3526 */
}
},
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, { 1*8, 31*8-1, 1*8, 31*8-1 },
gfxdecodeinfo,
256, 256,
exprraid_vh_convert_color_prom,
VIDEO_TYPE_RASTER | VIDEO_SUPPORTS_DIRTY,
0,
generic_vh_start,
generic_vh_stop,
exprraid_vh_screenrefresh,
/* sound hardware */
0,0,0,0,
{
{
SOUND_YM2203,
&ym2203_interface
},
{
SOUND_YM3526,
&ym3526_interface
}
}
};
/***************************************************************************
Game driver(s)
***************************************************************************/
ROM_START( exprraid )
ROM_REGION( 0x10000, REGION_CPU1 ) /* 64k for code */
ROM_LOAD( "cz01", 0x4000, 0x4000, 0xdc8f9fba )
ROM_LOAD( "cz00", 0x8000, 0x8000, 0xa81290bc )
ROM_REGION( 0x10000, REGION_CPU2 ) /* 64k for the sub cpu */
ROM_LOAD( "cz02", 0x8000, 0x8000, 0x552e6112 )
ROM_REGION( 0x04000, REGION_GFX1 | REGIONFLAG_DISPOSE )
ROM_LOAD( "cz07", 0x00000, 0x4000, 0x686bac23 ) /* characters */
ROM_REGION( 0x30000, REGION_GFX2 | REGIONFLAG_DISPOSE )
ROM_LOAD( "cz09", 0x00000, 0x8000, 0x1ed250d1 ) /* sprites */
ROM_LOAD( "cz08", 0x08000, 0x8000, 0x2293fc61 )
ROM_LOAD( "cz13", 0x10000, 0x8000, 0x7c3bfd00 )
ROM_LOAD( "cz12", 0x18000, 0x8000, 0xea2294c8 )
ROM_LOAD( "cz11", 0x20000, 0x8000, 0xb7418335 )
ROM_LOAD( "cz10", 0x28000, 0x8000, 0x2f611978 )
ROM_REGION( 0x20000, REGION_GFX3 | REGIONFLAG_DISPOSE )
ROM_LOAD( "cz04", 0x00000, 0x8000, 0x643a1bd3 ) /* tiles */
/* Save 0x08000-0x0ffff to expand the previous so we can decode the thing */
ROM_LOAD( "cz05", 0x10000, 0x8000, 0xc44570bf ) /* tiles */
ROM_LOAD( "cz06", 0x18000, 0x8000, 0xb9bb448b ) /* tiles */
ROM_REGION( 0x8000, REGION_GFX4 ) /* background tilemaps */
ROM_LOAD( "cz03", 0x0000, 0x8000, 0x6ce11971 )
ROM_REGION( 0x0400, REGION_PROMS )
ROM_LOAD( "cz17.prm", 0x0000, 0x0100, 0xda31dfbc ) /* red */
ROM_LOAD( "cz16.prm", 0x0100, 0x0100, 0x51f25b4c ) /* green */
ROM_LOAD( "cz15.prm", 0x0200, 0x0100, 0xa6168d7f ) /* blue */
ROM_LOAD( "cz14.prm", 0x0300, 0x0100, 0x52aad300 ) /* ??? */
ROM_END
ROM_START( wexpress )
ROM_REGION( 0x10000, REGION_CPU1 ) /* 64k for code */
ROM_LOAD( "2", 0x4000, 0x4000, 0xea5e5a8f )
ROM_LOAD( "1", 0x8000, 0x8000, 0xa7daae12 )
ROM_REGION( 0x10000, REGION_CPU2 ) /* 64k for the sub cpu */
ROM_LOAD( "cz02", 0x8000, 0x8000, 0x552e6112 )
ROM_REGION( 0x04000, REGION_GFX1 | REGIONFLAG_DISPOSE )
ROM_LOAD( "cz07", 0x00000, 0x4000, 0x686bac23 ) /* characters */
ROM_REGION( 0x30000, REGION_GFX2 | REGIONFLAG_DISPOSE )
ROM_LOAD( "cz09", 0x00000, 0x8000, 0x1ed250d1 ) /* sprites */
ROM_LOAD( "cz08", 0x08000, 0x8000, 0x2293fc61 )
ROM_LOAD( "cz13", 0x10000, 0x8000, 0x7c3bfd00 )
ROM_LOAD( "cz12", 0x18000, 0x8000, 0xea2294c8 )
ROM_LOAD( "cz11", 0x20000, 0x8000, 0xb7418335 )
ROM_LOAD( "cz10", 0x28000, 0x8000, 0x2f611978 )
ROM_REGION( 0x20000, REGION_GFX3 | REGIONFLAG_DISPOSE )
ROM_LOAD( "4", 0x00000, 0x8000, 0xf2e93ff0 ) /* tiles */
/* Save 0x08000-0x0ffff to expand the previous so we can decode the thing */
ROM_LOAD( "cz05", 0x10000, 0x8000, 0xc44570bf ) /* tiles */
ROM_LOAD( "6", 0x18000, 0x8000, 0xc3a56de5 ) /* tiles */
ROM_REGION( 0x8000, REGION_GFX4 ) /* background tilemaps */
ROM_LOAD( "3", 0x0000, 0x8000, 0x242e3e64 )
ROM_REGION( 0x0400, REGION_PROMS )
ROM_LOAD( "cz17.prm", 0x0000, 0x0100, 0xda31dfbc ) /* red */
ROM_LOAD( "cz16.prm", 0x0100, 0x0100, 0x51f25b4c ) /* green */
ROM_LOAD( "cz15.prm", 0x0200, 0x0100, 0xa6168d7f ) /* blue */
ROM_LOAD( "cz14.prm", 0x0300, 0x0100, 0x52aad300 ) /* ??? */
ROM_END
ROM_START( wexpresb )
ROM_REGION( 0x10000, REGION_CPU1 ) /* 64k for code */
ROM_LOAD( "wexpress.3", 0x4000, 0x4000, 0xb4dd0fa4 )
ROM_LOAD( "wexpress.1", 0x8000, 0x8000, 0xe8466596 )
ROM_REGION( 0x10000, REGION_CPU2 ) /* 64k for the sub cpu */
ROM_LOAD( "cz02", 0x8000, 0x8000, 0x552e6112 )
ROM_REGION( 0x04000, REGION_GFX1 | REGIONFLAG_DISPOSE )
ROM_LOAD( "cz07", 0x00000, 0x4000, 0x686bac23 ) /* characters */
ROM_REGION( 0x30000, REGION_GFX2 | REGIONFLAG_DISPOSE )
ROM_LOAD( "cz09", 0x00000, 0x8000, 0x1ed250d1 ) /* sprites */
ROM_LOAD( "cz08", 0x08000, 0x8000, 0x2293fc61 )
ROM_LOAD( "cz13", 0x10000, 0x8000, 0x7c3bfd00 )
ROM_LOAD( "cz12", 0x18000, 0x8000, 0xea2294c8 )
ROM_LOAD( "cz11", 0x20000, 0x8000, 0xb7418335 )
ROM_LOAD( "cz10", 0x28000, 0x8000, 0x2f611978 )
ROM_REGION( 0x20000, REGION_GFX3 | REGIONFLAG_DISPOSE )
ROM_LOAD( "4", 0x00000, 0x8000, 0xf2e93ff0 ) /* tiles */
/* Save 0x08000-0x0ffff to expand the previous so we can decode the thing */
ROM_LOAD( "cz05", 0x10000, 0x8000, 0xc44570bf ) /* tiles */
ROM_LOAD( "6", 0x18000, 0x8000, 0xc3a56de5 ) /* tiles */
ROM_REGION( 0x8000, REGION_GFX4 ) /* background tilemaps */
ROM_LOAD( "3", 0x0000, 0x8000, 0x242e3e64 )
ROM_REGION( 0x0400, REGION_PROMS )
ROM_LOAD( "cz17.prm", 0x0000, 0x0100, 0xda31dfbc ) /* red */
ROM_LOAD( "cz16.prm", 0x0100, 0x0100, 0x51f25b4c ) /* green */
ROM_LOAD( "cz15.prm", 0x0200, 0x0100, 0xa6168d7f ) /* blue */
ROM_LOAD( "cz14.prm", 0x0300, 0x0100, 0x52aad300 ) /* ??? */
ROM_END
static void exprraid_gfx_expand(void)
{
/* Expand the background rom so we can use regular decode routines */
unsigned char *gfx = memory_region(REGION_GFX3);
int offs = 0x10000-0x1000;
int i;
for ( i = 0x8000-0x1000; i >= 0; i-= 0x1000 )
{
memcpy( &(gfx[offs]), &(gfx[i]), 0x1000 );
offs -= 0x1000;
memcpy( &(gfx[offs]), &(gfx[i]), 0x1000 );
offs -= 0x1000;
}
}
static void init_wexpress(void)
{
unsigned char *rom = memory_region(REGION_CPU1);
int i;
exprraid_gfx_expand();
/* HACK!: Implement custom opcode as regular with a mapped io read */
for ( i = 0; i < 0x10000; i++ )
{
/* make sure is what we want to patch */
if ( rom[i] == 0x4b && rom[i+1] == 0x00 && rom[i+2] == 0x29 && rom[i+3] == 0x02 )
{
/* replace custom opcode with: LDA $FF */
rom[i] = 0xa5;
i++;
rom[i] = 0xff;
}
}
}
static void init_exprraid(void)
{
unsigned char *rom = memory_region(REGION_CPU1);
/* decode vectors */
rom[0xfffa] = rom[0xfff7];
rom[0xfffb] = rom[0xfff6];
rom[0xfffc] = rom[0xfff1];
rom[0xfffd] = rom[0xfff0];
rom[0xfffe] = rom[0xfff3];
rom[0xffff] = rom[0xfff2];
/* HACK!: Implement custom opcode as regular with a mapped io read */
init_wexpress();
}
static void init_wexpresb(void)
{
exprraid_gfx_expand();
}
GAMEX( 1986, exprraid, 0, exprraid, exprraid, exprraid, ROT0, "Data East USA", "Express Raider (US)", GAME_NO_COCKTAIL )
GAMEX( 1986, wexpress, exprraid, exprraid, exprraid, wexpress, ROT0, "Data East Corporation", "Western Express (World?)", GAME_NO_COCKTAIL )
GAMEX( 1986, wexpresb, exprraid, exprraid, exprraid, wexpresb, ROT0, "bootleg", "Western Express (bootleg)", GAME_NO_COCKTAIL )