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Diffstat (limited to 'src/mame/drivers/prehisle.c')
-rw-r--r--src/mame/drivers/prehisle.c415
1 files changed, 415 insertions, 0 deletions
diff --git a/src/mame/drivers/prehisle.c b/src/mame/drivers/prehisle.c
new file mode 100644
index 00000000000..274d0ffbe6a
--- /dev/null
+++ b/src/mame/drivers/prehisle.c
@@ -0,0 +1,415 @@
+/***************************************************************************
+
+ Prehistoric Isle in 1930 (World) (c) 1989 SNK
+ Prehistoric Isle in 1930 (USA) (c) 1989 SNK
+ Genshi-Tou 1930's (Japan) (c) 1989 SNK
+
+ Emulation by Bryan McPhail, mish@tendril.co.uk
+
+***************************************************************************/
+
+#include "driver.h"
+#include "sound/upd7759.h"
+#include "sound/3812intf.h"
+
+extern WRITE16_HANDLER( prehisle_bg_videoram16_w );
+extern WRITE16_HANDLER( prehisle_fg_videoram16_w );
+extern WRITE16_HANDLER( prehisle_control16_w );
+extern READ16_HANDLER( prehisle_control16_r );
+
+extern VIDEO_START( prehisle );
+extern VIDEO_UPDATE( prehisle );
+
+extern UINT16 *prehisle_bg_videoram16;
+
+static UINT16 *prehisle_ram16;
+
+/******************************************************************************/
+
+static WRITE16_HANDLER( prehisle_sound16_w )
+{
+ soundlatch_w(0, data & 0xff);
+ cpunum_set_input_line(1, INPUT_LINE_NMI, PULSE_LINE);
+}
+
+/*******************************************************************************/
+
+static ADDRESS_MAP_START( prehisle_readmem, ADDRESS_SPACE_PROGRAM, 16 )
+ AM_RANGE(0x000000, 0x03ffff) AM_READ(MRA16_ROM)
+ AM_RANGE(0x070000, 0x073fff) AM_READ(MRA16_RAM)
+ AM_RANGE(0x090000, 0x0907ff) AM_READ(MRA16_RAM)
+ AM_RANGE(0x0a0000, 0x0a07ff) AM_READ(MRA16_RAM)
+ AM_RANGE(0x0b0000, 0x0b3fff) AM_READ(MRA16_RAM)
+ AM_RANGE(0x0d0000, 0x0d07ff) AM_READ(MRA16_RAM)
+ AM_RANGE(0x0e0000, 0x0e00ff) AM_READ(prehisle_control16_r)
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( prehisle_writemem, ADDRESS_SPACE_PROGRAM, 16 )
+ AM_RANGE(0x000000, 0x03ffff) AM_WRITE(MWA16_ROM)
+ AM_RANGE(0x070000, 0x073fff) AM_WRITE(MWA16_RAM) AM_BASE(&prehisle_ram16)
+ AM_RANGE(0x090000, 0x0907ff) AM_WRITE(prehisle_fg_videoram16_w) AM_BASE(&videoram16)
+ AM_RANGE(0x0a0000, 0x0a07ff) AM_WRITE(MWA16_RAM) AM_BASE(&spriteram16)
+ AM_RANGE(0x0b0000, 0x0b3fff) AM_WRITE(prehisle_bg_videoram16_w) AM_BASE(&prehisle_bg_videoram16)
+ AM_RANGE(0x0d0000, 0x0d07ff) AM_WRITE(paletteram16_RRRRGGGGBBBBxxxx_word_w) AM_BASE(&paletteram16)
+ AM_RANGE(0x0f0070, 0x0ff071) AM_WRITE(prehisle_sound16_w)
+ AM_RANGE(0x0f0000, 0x0ff0ff) AM_WRITE(prehisle_control16_w)
+ADDRESS_MAP_END
+
+/******************************************************************************/
+
+static WRITE8_HANDLER( D7759_write_port_0_w )
+{
+ upd7759_port_w(offset,data);
+ upd7759_start_w (0,0);
+ upd7759_start_w (0,1);
+}
+
+static ADDRESS_MAP_START( prehisle_sound_readmem, ADDRESS_SPACE_PROGRAM, 8 )
+ AM_RANGE(0x0000, 0xefff) AM_READ(MRA8_ROM)
+ AM_RANGE(0xf000, 0xf7ff) AM_READ(MRA8_RAM)
+ AM_RANGE(0xf800, 0xf800) AM_READ(soundlatch_r)
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( prehisle_sound_writemem, ADDRESS_SPACE_PROGRAM, 8 )
+ AM_RANGE(0x0000, 0xefff) AM_WRITE(MWA8_ROM)
+ AM_RANGE(0xf000, 0xf7ff) AM_WRITE(MWA8_RAM)
+ AM_RANGE(0xf800, 0xf800) AM_WRITE(MWA8_NOP) // ???
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( prehisle_sound_readport, ADDRESS_SPACE_IO, 8 )
+ ADDRESS_MAP_FLAGS( AMEF_ABITS(8) )
+ AM_RANGE(0x00, 0x00) AM_READ(YM3812_status_port_0_r)
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( prehisle_sound_writeport, ADDRESS_SPACE_IO, 8 )
+ ADDRESS_MAP_FLAGS( AMEF_ABITS(8) )
+ AM_RANGE(0x00, 0x00) AM_WRITE(YM3812_control_port_0_w)
+ AM_RANGE(0x20, 0x20) AM_WRITE(YM3812_write_port_0_w)
+ AM_RANGE(0x40, 0x40) AM_WRITE(D7759_write_port_0_w)
+ AM_RANGE(0x80, 0x80) AM_WRITE(upd7759_0_reset_w)
+ADDRESS_MAP_END
+
+/******************************************************************************/
+
+static INPUT_PORTS_START( prehisle )
+ PORT_START /* Player 1 controls */
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 )
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_BUTTON3 )
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START1 )
+
+ PORT_START /* Player 2 controls */
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2)
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(2)
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(2)
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2)
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(2)
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START2 )
+
+ PORT_START /* coin */
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_SERVICE1 )
+ PORT_SERVICE_NO_TOGGLE( 0x08, IP_ACTIVE_LOW )
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_TILT )
+ PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START /* Dip switches */
+ PORT_DIPNAME( 0x01, 0x01, DEF_STR( Flip_Screen ) )
+ PORT_DIPSETTING( 0x01, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( On ) )
+ PORT_DIPNAME( 0x02, 0x02, DEF_STR( Level_Select ) )
+ PORT_DIPSETTING( 0x02, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( On ) )
+ PORT_DIPNAME( 0x04, 0x04, DEF_STR( Bonus_Life ) )
+ PORT_DIPSETTING( 0x04, "Only Twice" )
+ PORT_DIPSETTING( 0x00, "Always" )
+ PORT_DIPNAME( 0x08, 0x08, DEF_STR( Unknown ) )
+ PORT_DIPSETTING( 0x08, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( On ) )
+ PORT_DIPNAME( 0x30, 0x30, DEF_STR( Coinage ) )
+ PORT_DIPSETTING( 0x00, "A 4C/1C B 1C/4C" )
+ PORT_DIPSETTING( 0x10, "A 3C/1C B 1C/3C" )
+ PORT_DIPSETTING( 0x20, "A 2C/1C B 1C/2C" )
+ PORT_DIPSETTING( 0x30, DEF_STR( 1C_1C ) )
+ PORT_DIPNAME( 0xc0, 0xc0, DEF_STR( Lives ) )
+ PORT_DIPSETTING( 0x80, "2" )
+ PORT_DIPSETTING( 0xc0, "3" )
+ PORT_DIPSETTING( 0x40, "4" )
+ PORT_DIPSETTING( 0x00, "5" )
+
+ PORT_START
+ PORT_DIPNAME( 0x03, 0x03, DEF_STR( Difficulty ) )
+ PORT_DIPSETTING( 0x02, DEF_STR( Easy ) )
+ PORT_DIPSETTING( 0x03, DEF_STR( Standard ) )
+ PORT_DIPSETTING( 0x01, "Middle" )
+ PORT_DIPSETTING( 0x00, "Difficult" )
+ PORT_DIPNAME( 0x0c, 0x0c, "Game Mode" )
+ PORT_DIPSETTING( 0x08, "Demo Sounds Off" )
+ PORT_DIPSETTING( 0x0c, "Demo Sounds On" )
+ PORT_DIPSETTING( 0x00, "Freeze" )
+ PORT_DIPSETTING( 0x04, "Infinite Lives" )
+ PORT_DIPNAME( 0x30, 0x30, DEF_STR( Bonus_Life ) )
+ PORT_DIPSETTING( 0x30, "100K 200K" )
+ PORT_DIPSETTING( 0x20, "150K 300K" )
+ PORT_DIPSETTING( 0x10, "300K 500K" )
+ PORT_DIPSETTING( 0x00, DEF_STR( None ) )
+ PORT_DIPNAME( 0x40, 0x40, DEF_STR( Allow_Continue ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( No ) )
+ PORT_DIPSETTING( 0x40, DEF_STR( Yes ) )
+ PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_VBLANK )
+INPUT_PORTS_END
+
+/******************************************************************************/
+
+static const gfx_layout charlayout =
+{
+ 8,8, /* 8*8 characters */
+ 1024,
+ 4, /* 4 bits per pixel */
+ { 0, 1, 2, 3 },
+ { 0, 4, 8, 12, 16, 20, 24, 28},
+ { 0*32, 1*32, 2*32, 3*32, 4*32, 5*32, 6*32, 7*32 },
+ 32*8 /* every char takes 32 consecutive bytes */
+};
+
+static const gfx_layout tilelayout =
+{
+ 16,16, /* 16*16 sprites */
+ 0x800,
+ 4, /* 4 bits per pixel */
+ { 0, 1, 2, 3 },
+ { 0,4,8,12,16,20,24,28,
+ 0+64*8,4+64*8,8+64*8,12+64*8,16+64*8,20+64*8,24+64*8,28+64*8 },
+ { 0*32, 1*32, 2*32, 3*32, 4*32, 5*32, 6*32, 7*32,
+ 8*32, 9*32, 10*32, 11*32, 12*32, 13*32, 14*32, 15*32 },
+ 128*8 /* every sprite takes 64 consecutive bytes */
+};
+
+static const gfx_layout spritelayout =
+{
+ 16,16, /* 16*16 sprites */
+ 5120,
+ 4, /* 4 bits per pixel */
+ { 0, 1, 2, 3 },
+ { 0,4,8,12,16,20,24,28,
+ 0+64*8,4+64*8,8+64*8,12+64*8,16+64*8,20+64*8,24+64*8,28+64*8 },
+ { 0*32, 1*32, 2*32, 3*32, 4*32, 5*32, 6*32, 7*32,
+ 8*32, 9*32, 10*32, 11*32, 12*32, 13*32, 14*32, 15*32 },
+ 128*8 /* every sprite takes 64 consecutive bytes */
+};
+
+static GFXDECODE_START( prehisle )
+ GFXDECODE_ENTRY( REGION_GFX1, 0, charlayout, 0, 16 )
+ GFXDECODE_ENTRY( REGION_GFX2, 0, tilelayout, 768, 16 )
+ GFXDECODE_ENTRY( REGION_GFX3, 0, tilelayout, 512, 16 )
+ GFXDECODE_ENTRY( REGION_GFX4, 0, spritelayout, 256, 16 )
+GFXDECODE_END
+
+/******************************************************************************/
+
+static void irqhandler(int irq)
+{
+ cpunum_set_input_line(1,0,irq ? ASSERT_LINE : CLEAR_LINE);
+}
+
+static struct YM3812interface ym3812_interface =
+{
+ irqhandler
+};
+
+static struct upd7759_interface upd7759_interface =
+{
+ REGION_SOUND1 /* memory region */
+};
+
+/******************************************************************************/
+
+static MACHINE_DRIVER_START( prehisle )
+
+ /* basic machine hardware */
+ MDRV_CPU_ADD(M68000, 12000000)
+ MDRV_CPU_PROGRAM_MAP(prehisle_readmem,prehisle_writemem)
+ MDRV_CPU_VBLANK_INT(irq4_line_hold,1)
+
+ MDRV_CPU_ADD(Z80, 4000000)
+ /* audio CPU */
+ MDRV_CPU_PROGRAM_MAP(prehisle_sound_readmem,prehisle_sound_writemem)
+ MDRV_CPU_IO_MAP(prehisle_sound_readport,prehisle_sound_writeport)
+
+ MDRV_SCREEN_REFRESH_RATE(60)
+ MDRV_SCREEN_VBLANK_TIME(DEFAULT_REAL_60HZ_VBLANK_DURATION)
+
+ /* video hardware */
+ MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER)
+ MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
+ MDRV_SCREEN_SIZE(32*8, 32*8)
+ MDRV_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 2*8, 30*8-1)
+ MDRV_GFXDECODE(prehisle)
+ MDRV_PALETTE_LENGTH(1024)
+
+ MDRV_VIDEO_START(prehisle)
+ MDRV_VIDEO_UPDATE(prehisle)
+
+ /* sound hardware */
+ MDRV_SPEAKER_STANDARD_MONO("mono")
+
+ MDRV_SOUND_ADD(YM3812, 4000000)
+ MDRV_SOUND_CONFIG(ym3812_interface)
+ MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
+
+ MDRV_SOUND_ADD(UPD7759, UPD7759_STANDARD_CLOCK)
+ MDRV_SOUND_CONFIG(upd7759_interface)
+ MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.90)
+MACHINE_DRIVER_END
+
+/******************************************************************************/
+
+ROM_START( prehisle )
+ ROM_REGION( 0x40000, REGION_CPU1, 0 )
+ ROM_LOAD16_BYTE( "gt.2", 0x00000, 0x20000, CRC(7083245a) SHA1(c4f72440e3fb130c8c44224c958bf70c61e8c34e) )
+ ROM_LOAD16_BYTE( "gt.3", 0x00001, 0x20000, CRC(6d8cdf58) SHA1(0078e54db899132d2b1244aed0b974173717f82e) )
+
+ ROM_REGION( 0x10000, REGION_CPU2, 0 ) /* Sound CPU */
+ ROM_LOAD( "gt.1", 0x000000, 0x10000, CRC(80a4c093) SHA1(abe59e43259eb80b504bd5541f58cd0e5eb998ab) )
+
+ ROM_REGION( 0x008000, REGION_GFX1, ROMREGION_DISPOSE )
+ ROM_LOAD( "gt15.b15", 0x000000, 0x08000, CRC(ac652412) SHA1(916c04c3a8a7bfb961313ab73c0a27d7f5e48de1) )
+
+ ROM_REGION( 0x040000, REGION_GFX2, ROMREGION_DISPOSE )
+ ROM_LOAD( "pi8914.b14", 0x000000, 0x40000, CRC(207d6187) SHA1(505dfd1424b894e7b898f91b89f021ddde433c48) )
+
+ ROM_REGION( 0x040000, REGION_GFX3, ROMREGION_DISPOSE )
+ ROM_LOAD( "pi8916.h16", 0x000000, 0x40000, CRC(7cffe0f6) SHA1(aba08617964fc425418b098be5167021768bd47c) )
+
+ ROM_REGION( 0x0a0000, REGION_GFX4, ROMREGION_DISPOSE )
+ ROM_LOAD( "pi8910.k14", 0x000000, 0x80000, CRC(5a101b0b) SHA1(9645ab1f8d058cf2c6c42ccb4ce92a9b5db10c51) )
+ ROM_LOAD( "gt.5", 0x080000, 0x20000, CRC(3d3ab273) SHA1(b5706ada9eb2c22fcc0ac8ede2d2ee02ee853191) )
+
+ ROM_REGION( 0x10000, REGION_GFX5, 0 ) /* background tilemaps */
+ ROM_LOAD( "gt.11", 0x000000, 0x10000, CRC(b4f0fcf0) SHA1(b81cc0b6e3e6f5616789bb3e77807dc0ef718a38) )
+
+ ROM_REGION( 0x20000, REGION_SOUND1, 0 ) /* ADPCM samples */
+ ROM_LOAD( "gt.4", 0x000000, 0x20000, CRC(85dfb9ec) SHA1(78c865e7ccffddb71dcddccab358fa945f521f25) )
+ROM_END
+
+ROM_START( prehislu )
+ ROM_REGION( 0x40000, REGION_CPU1, 0 )
+ ROM_LOAD16_BYTE( "gt-u2.2h", 0x00000, 0x20000, CRC(a14f49bb) SHA1(6b39a894c3d3862be349a58c748d2d763d5a269c) )
+ ROM_LOAD16_BYTE( "gt-u3.3h", 0x00001, 0x20000, CRC(f165757e) SHA1(26cf369fed1713deec182852d76fe014ed46d6ac) )
+
+ ROM_REGION( 0x10000, REGION_CPU2, 0 ) /* Sound CPU */
+ ROM_LOAD( "gt.1", 0x000000, 0x10000, CRC(80a4c093) SHA1(abe59e43259eb80b504bd5541f58cd0e5eb998ab) )
+
+ ROM_REGION( 0x008000, REGION_GFX1, ROMREGION_DISPOSE )
+ ROM_LOAD( "gt15.b15", 0x000000, 0x08000, CRC(ac652412) SHA1(916c04c3a8a7bfb961313ab73c0a27d7f5e48de1) )
+
+ ROM_REGION( 0x040000, REGION_GFX2, ROMREGION_DISPOSE )
+ ROM_LOAD( "pi8914.b14", 0x000000, 0x40000, CRC(207d6187) SHA1(505dfd1424b894e7b898f91b89f021ddde433c48) )
+
+ ROM_REGION( 0x040000, REGION_GFX3, ROMREGION_DISPOSE )
+ ROM_LOAD( "pi8916.h16", 0x000000, 0x40000, CRC(7cffe0f6) SHA1(aba08617964fc425418b098be5167021768bd47c) )
+
+ ROM_REGION( 0x0a0000, REGION_GFX4, ROMREGION_DISPOSE )
+ ROM_LOAD( "pi8910.k14", 0x000000, 0x80000, CRC(5a101b0b) SHA1(9645ab1f8d058cf2c6c42ccb4ce92a9b5db10c51) )
+ ROM_LOAD( "gt.5", 0x080000, 0x20000, CRC(3d3ab273) SHA1(b5706ada9eb2c22fcc0ac8ede2d2ee02ee853191) )
+
+ ROM_REGION( 0x10000, REGION_GFX5, 0 ) /* background tilemaps */
+ ROM_LOAD( "gt.11", 0x000000, 0x10000, CRC(b4f0fcf0) SHA1(b81cc0b6e3e6f5616789bb3e77807dc0ef718a38) )
+
+ ROM_REGION( 0x20000, REGION_SOUND1, 0 ) /* ADPCM samples */
+ ROM_LOAD( "gt.4", 0x000000, 0x20000, CRC(85dfb9ec) SHA1(78c865e7ccffddb71dcddccab358fa945f521f25) )
+ROM_END
+
+ROM_START( gensitou )
+ ROM_REGION( 0x40000, REGION_CPU1, 0 )
+ ROM_LOAD16_BYTE( "gt2j.bin", 0x00000, 0x20000, CRC(a2da0b6b) SHA1(d102118f83b96094fd4ea4b3468713c4946c949d) )
+ ROM_LOAD16_BYTE( "gt3j.bin", 0x00001, 0x20000, CRC(c1a0ae8e) SHA1(2c9643abfd71edf8612e63d69cea4fbc19aad19d) )
+
+ ROM_REGION( 0x10000, REGION_CPU2, 0 ) /* Sound CPU */
+ ROM_LOAD( "gt.1", 0x000000, 0x10000, CRC(80a4c093) SHA1(abe59e43259eb80b504bd5541f58cd0e5eb998ab) )
+
+ ROM_REGION( 0x008000, REGION_GFX1, ROMREGION_DISPOSE )
+ ROM_LOAD( "gt15.b15", 0x000000, 0x08000, CRC(ac652412) SHA1(916c04c3a8a7bfb961313ab73c0a27d7f5e48de1) )
+
+ ROM_REGION( 0x040000, REGION_GFX2, ROMREGION_DISPOSE )
+ ROM_LOAD( "pi8914.b14", 0x000000, 0x40000, CRC(207d6187) SHA1(505dfd1424b894e7b898f91b89f021ddde433c48) )
+
+ ROM_REGION( 0x040000, REGION_GFX3, ROMREGION_DISPOSE )
+ ROM_LOAD( "pi8916.h16", 0x000000, 0x40000, CRC(7cffe0f6) SHA1(aba08617964fc425418b098be5167021768bd47c) )
+
+ ROM_REGION( 0x0a0000, REGION_GFX4, ROMREGION_DISPOSE )
+ ROM_LOAD( "pi8910.k14", 0x000000, 0x80000, CRC(5a101b0b) SHA1(9645ab1f8d058cf2c6c42ccb4ce92a9b5db10c51) )
+ ROM_LOAD( "gt.5", 0x080000, 0x20000, CRC(3d3ab273) SHA1(b5706ada9eb2c22fcc0ac8ede2d2ee02ee853191) )
+
+ ROM_REGION( 0x10000, REGION_GFX5, 0 ) /* background tilemaps */
+ ROM_LOAD( "gt.11", 0x000000, 0x10000, CRC(b4f0fcf0) SHA1(b81cc0b6e3e6f5616789bb3e77807dc0ef718a38) )
+
+ ROM_REGION( 0x20000, REGION_SOUND1, 0 ) /* ADPCM samples */
+ ROM_LOAD( "gt.4", 0x000000, 0x20000, CRC(85dfb9ec) SHA1(78c865e7ccffddb71dcddccab358fa945f521f25) )
+ROM_END
+
+/******************************************************************************/
+
+static READ16_HANDLER( world_cycle_r )
+{
+ int pc=activecpu_get_pc();
+ int ret=prehisle_ram16[0x12];
+
+ if ((ret&0x8000) && (pc==0x260c || pc==0x268a || pc==0x2b0a || pc==0x34a8 || pc==0x6ae4 || pc==0x83ac || pc==0x25ce || pc==0x29c4)) {
+ cpu_spinuntil_int();
+ return ret&0x7fff;
+ }
+ return ret;
+}
+
+static DRIVER_INIT( prehisle )
+{
+ memory_install_read16_handler(0, ADDRESS_SPACE_PROGRAM, 0x70024, 0x70025, 0, 0, world_cycle_r);
+}
+
+static READ16_HANDLER( usa_cycle_r )
+{
+ int pc=activecpu_get_pc();
+ int ret=prehisle_ram16[0x12];
+
+ if ((ret&0x8000) && (pc==0x281e || pc==0x28a6 || pc==0x295a || pc==0x2868 || pc==0x8f98 || pc==0x3b1e)) {
+ cpu_spinuntil_int();
+ return ret&0x7fff;
+ }
+ return ret;
+}
+
+static DRIVER_INIT( prehislu )
+{
+ memory_install_read16_handler(0, ADDRESS_SPACE_PROGRAM, 0x70024, 0x70025, 0, 0, usa_cycle_r);
+}
+
+static READ16_HANDLER( jap_cycle_r )
+{
+ int pc=activecpu_get_pc();
+ int ret=prehisle_ram16[0x12];
+
+ if ((ret&0x8000) && (pc==0x34b6 /* Todo! */ )) {
+ cpu_spinuntil_int();
+ return ret&0x7fff;
+ }
+ return ret;
+}
+
+static DRIVER_INIT( gensitou )
+{
+ memory_install_read16_handler(0, ADDRESS_SPACE_PROGRAM, 0x70024, 0x70025, 0, 0, jap_cycle_r);
+}
+
+/******************************************************************************/
+
+GAME( 1989, prehisle, 0, prehisle, prehisle, prehisle, ROT0, "SNK", "Prehistoric Isle in 1930 (World)", GAME_SUPPORTS_SAVE )
+GAME( 1989, prehislu, prehisle, prehisle, prehisle, prehislu, ROT0, "SNK of America", "Prehistoric Isle in 1930 (US)", GAME_SUPPORTS_SAVE )
+GAME( 1989, gensitou, prehisle, prehisle, prehisle, gensitou, ROT0, "SNK", "Genshi-Tou 1930's", GAME_SUPPORTS_SAVE )