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- /***************************************************************************
-
- 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 )
-