/******************************************************************** G-Stream (c)2002 Oriental Soft Japan Are 'Oriental Soft Japan' actually a Korean company? Hyperstone based hardware Simple Sprites (16x16x8bpp tiles) 3 Simple Tilemaps (32x32x8bpp tiles) todo: sprite lag (sprites need buffering?) sound banking CPU: E1-32XT Sound: 2x AD-65 (OKIM6295 clone) Xtals: 1.000Mhz (near AD-65a) 16.000Mhz (near E1-32XT / u56.bin) 27.000Mhz (near GFX Section & 54.000Mhz) 54.000Mhz (near GFX Section & 27.000Mhz) notes: cpu #0 (PC=00002C34): unmapped program memory dword read from 515ECE48 & FFFFFFFF what is this, buggy code? Is there a problem with the OKI status reads for the AD-65 clone? the game reads the status register all the time, causing severe slowdown etc, might be related to bad OKI banking tho. --- Dump Notes::: G-Stream 2020, 2002 Oriental Soft Japan Shooter from Oriental soft, heavy influence from XII Stag as well as Trizeal. Three weapons may be carried and their power controlled by picking up capsules of a specific colour. Three capsule types: . Red - Vulcan . Green - Missiles . Blue - Laser Points are awarded by picking up medals which are released from shot down enemies. The medal value and appearance is increased as long as you don't miss any. When enough medals have been picked up a "void" bomb becomes available which when released (hold down main shot) will create a circular "void". Enemy bullets which hit this "void" are transformed into medals. If you place your ship inside this "void" it becomes invulnerable like in XII Stag. The game is powered by a HyperStone E1-32XT. A battery on the PCB saves hi-scores. Hi-Scores can be reset by toggling switch S2. Documentation: Name Size CRC32 ---------------------------------------- g-stream_demo.jpg 195939 0x37984e02 g-stream_title.jpg 152672 0xf7b9bfd3 g-stream_pcb.jpg 2563664 0x5ec864f3 Name Size CRC32 Chip Type --------------------------------------------- gs_prg_02.bin 2097152 0x2f8a6bea 27C160 gs_gr_01.bin 2097152 0xb82cfab8 27C160 gs_gr_02.bin 2097152 0x37e19cbd 27C160 gs_gr_03.bin 2097152 0x1a3b2b11 27C160 gs_gr_04.bin 2097152 0xa4e8906c 27C160 gs_gr_05.bin 2097152 0xef283a73 27C160 gs_gr_06.bin 2097152 0xd4e3a2b2 27C160 gs_gr_07.bin 2097152 0x84e66fe1 27C160 gs_gr_08.bin 2097152 0xabd0d6aa 27C160 gs_gr_09.bin 2097152 0xf2c4fd77 27C160 gs_gr_10.bin 2097152 0xd696d15d 27C160 gs_gr_11.bin 2097152 0x946d71d1 27C160 gs_gr_12.bin 2097152 0x94b56e4e 27C160 gs_gr_13.bin 2097152 0x7daaeff0 27C160 gs_gr_14.bin 2097152 0x6bd2a1e1 27C160 gs_snd_01.bin 524288 0x79b64d3f 27C040 gs_snd_02.bin 524288 0xe49ed92c 27C040 gs_snd_03.bin 524288 0x2bfff4ac 27C040 gs_snd_04.bin 524288 0xb259de3b 27C040 u56.bin 524288 0x0d0c6a38 27C040 . Board supplied by Tormod . Board dumped by Tormod *********************************************************************/ #include "driver.h" #include "sound/okim6295.h" static UINT32 *gstream_vram; static UINT32 *gstream_workram; static tilemap *gstream_tilemap1; static tilemap *gstream_tilemap2; static tilemap *gstream_tilemap3; static UINT32 tilemap1_scrollx, tilemap2_scrollx, tilemap3_scrollx; static UINT32 tilemap1_scrolly, tilemap2_scrolly, tilemap3_scrolly; static WRITE32_HANDLER( gstream_palette_w ) { COMBINE_DATA(&paletteram32[offset]); palette_set_color_rgb(Machine,offset*2,pal5bit(paletteram32[offset] >> (0+16)), pal5bit(paletteram32[offset] >> (6+16)), pal5bit(paletteram32[offset] >> (11+16))); palette_set_color_rgb(Machine,offset*2+1,pal5bit(paletteram32[offset] >> (0)), pal5bit(paletteram32[offset] >> (6)), pal5bit(paletteram32[offset] >> (11))); } static WRITE32_HANDLER( gstream_vram_w ) { COMBINE_DATA(&gstream_vram[offset]); if (ACCESSING_MSB32) { if (offset>=0x000/4 && offset<0x400/4) { tilemap_mark_tile_dirty(gstream_tilemap1,offset-(0x000/4)); } else if (offset>=0x400/4 && offset<0x800/4) { tilemap_mark_tile_dirty(gstream_tilemap2,offset-(0x400/4)); } else if (offset>=0x800/4 && offset<0xc00/4) { tilemap_mark_tile_dirty(gstream_tilemap3,offset-(0x800/4)); } } } static WRITE32_HANDLER( gstream_tilemap1_scrollx_w ) { tilemap1_scrollx = data; } static WRITE32_HANDLER( gstream_tilemap1_scrolly_w ) { tilemap1_scrolly = data; } static WRITE32_HANDLER( gstream_tilemap2_scrollx_w ) { tilemap2_scrollx = data; } static WRITE32_HANDLER( gstream_tilemap2_scrolly_w ) { tilemap2_scrolly = data; } static WRITE32_HANDLER( gstream_tilemap3_scrollx_w ) { tilemap3_scrollx = data; } static WRITE32_HANDLER( gstream_tilemap3_scrolly_w ) { tilemap3_scrolly = data; } static ADDRESS_MAP_START( gstream_32bit_map, ADDRESS_SPACE_PROGRAM, 32 ) AM_RANGE(0x00000000, 0x003FFFFF) AM_RAM AM_BASE(&gstream_workram) // work ram // AM_RANGE(0x40000000, 0x40FFFFFF) AM_RAM // ?? lots of data gets copied here if present, but game runs without it?? AM_RANGE(0x80000000, 0x80003FFF) AM_RAM AM_WRITE(gstream_vram_w) AM_BASE(&gstream_vram) // video ram AM_RANGE(0x4E000000, 0x4E1FFFFF) AM_ROM AM_REGION(REGION_USER2,0) // main game rom AM_RANGE(0x4F000000, 0x4F000003) AM_WRITE(gstream_tilemap3_scrollx_w) AM_RANGE(0x4F200000, 0x4F200003) AM_WRITE(gstream_tilemap3_scrolly_w) AM_RANGE(0x4F400000, 0x4F406FFF) AM_RAM AM_WRITE(gstream_palette_w) AM_BASE(&paletteram32) AM_RANGE(0x4F800000, 0x4F800003) AM_WRITE(gstream_tilemap1_scrollx_w) AM_RANGE(0x4FA00000, 0x4FA00003) AM_WRITE(gstream_tilemap1_scrolly_w) AM_RANGE(0x4FC00000, 0x4FC00003) AM_WRITE(gstream_tilemap2_scrollx_w) AM_RANGE(0x4FE00000, 0x4FE00003) AM_WRITE(gstream_tilemap2_scrolly_w) AM_RANGE(0xFFC00000, 0xFFC01FFF) AM_RAM AM_BASE(&generic_nvram32) AM_SIZE(&generic_nvram_size) // Backup RAM AM_RANGE(0xFFF80000, 0xFFFFFFFF) AM_ROM AM_REGION(REGION_USER1,0) // boot rom ADDRESS_MAP_END static READ32_HANDLER( gstream_oki_0_r ) { return OKIM6295_status_0_r(0); } static READ32_HANDLER( gstream_oki_1_r ) { return OKIM6295_status_1_r(0); } static WRITE32_HANDLER( gstream_oki_0_w ) { OKIM6295_data_0_w(0, data & 0xff); } static WRITE32_HANDLER( gstream_oki_1_w ) { OKIM6295_data_1_w(0, data & 0xff); } static WRITE32_HANDLER( gstream_oki_4030_w ) { /* // the only nibbles that are written are: 0x6 0x7 0x9 0xa 0xb 0xe 0xd 0xf which should map to the 8 oki banks static const int bank_lookup[16] = { -1, -1, -1, -1, -1, -1, 0, 1, -1, 2, 3, 4, -1, 5, 6, 7 }; static int old_bank_0 = -1; static int old_bank_1 = -1; if(bank_lookup[data & 0xf] != old_bank_0) { old_bank_0 = bank_lookup[data & 0xf]; if(old_bank_0 != -1) OKIM6295_set_bank_base(0, old_bank_0 * 0x40000); else logerror("oki_0 banking value = %X\n",data & 0xf); } if(bank_lookup[(data >> 4) & 0xf] != old_bank_1) { old_bank_1 = bank_lookup[(data >> 4) & 0xf]; if(old_bank_1 != -1) OKIM6295_set_bank_base(1, old_bank_1 * 0x40000); else logerror("oki_1 banking value = %X\n",(data >> 4) & 0xf); } */ } static WRITE32_HANDLER( gstream_oki_4040_w ) { // data == 0 or data == 0x81 } static ADDRESS_MAP_START( gstream_io, ADDRESS_SPACE_IO, 32 ) AM_RANGE(0x4000, 0x4003) AM_READ(input_port_0_dword_r) AM_RANGE(0x4010, 0x4013) AM_READ(input_port_1_dword_r) AM_RANGE(0x4020, 0x4023) AM_READ(input_port_2_dword_r) // extra coin switches etc AM_RANGE(0x4030, 0x4033) AM_WRITE(gstream_oki_4030_w) // ?? AM_RANGE(0x4040, 0x4043) AM_WRITE(gstream_oki_4040_w) // ?? AM_RANGE(0x4050, 0x4053) AM_READWRITE(gstream_oki_1_r, gstream_oki_1_w) // music AM_RANGE(0x4060, 0x4063) AM_READWRITE(gstream_oki_0_r, gstream_oki_0_w) // samples ADDRESS_MAP_END static INPUT_PORTS_START( gstream ) PORT_START PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_PLAYER(1) PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_PLAYER(1) PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_PLAYER(1) PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(1) PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1) PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1) PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(1) PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_BUTTON4 ) PORT_PLAYER(1) PORT_BIT( 0x0100, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_BIT( 0x0200, IP_ACTIVE_LOW, IPT_COIN1 ) PORT_BIT( 0x0400, IP_ACTIVE_LOW, IPT_START1 ) PORT_BIT( 0x0800, IP_ACTIVE_LOW, IPT_SERVICE1 ) PORT_BIT( 0xe000, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_SERVICE_NO_TOGGLE( 0x8000, IP_ACTIVE_LOW ) PORT_START PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_PLAYER(2) PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_PLAYER(2) PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_PLAYER(2) PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(2) PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2) PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2) PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(2) PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_BUTTON4 ) PORT_PLAYER(2) PORT_BIT( 0x0100, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_BIT( 0x0200, IP_ACTIVE_LOW, IPT_COIN2 ) PORT_BIT( 0x0400, IP_ACTIVE_LOW, IPT_START2 ) PORT_BIT( 0x0800, IP_ACTIVE_LOW, IPT_SERVICE2 ) PORT_BIT( 0xe000, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_SERVICE_NO_TOGGLE( 0x8000, IP_ACTIVE_LOW ) PORT_START PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_COIN1 ) // mirror of some inputs... PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_COIN2 ) PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_START1 ) PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_START2 ) PORT_BIT( 0xffb0, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_SERVICE_NO_TOGGLE( 0x40, IP_ACTIVE_LOW ) INPUT_PORTS_END static const gfx_layout layout16x16 = { 16,16, RGN_FRAC(1,1), 8, { 0,1,2,3,4,5,6,7 }, { 0,8,16,24, 32,40,48,56, 64,72,80,88 ,96,104,112,120 }, { 0*128, 1*128, 2*128, 3*128, 4*128, 5*128, 6*128, 7*128, 8*128,9*128,10*128,11*128,12*128,13*128,14*128,15*128 }, 16*128, }; static const gfx_layout layout32x32 = { 32,32, RGN_FRAC(1,1), 8, { 0,1,2,3,4,5,6,7 }, { 0, 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 120, 128, 136, 144, 152, 160, 168, 176, 184, 192, 200, 208, 216, 224, 232, 240, 248 }, { 0*256, 1*256, 2*256, 3*256, 4*256, 5*256, 6*256, 7*256, 8*256, 9*256, 10*256, 11*256, 12*256, 13*256, 14*256, 15*256, 16*256, 17*256, 18*256, 19*256, 20*256, 21*256, 22*256, 23*256, 24*256, 25*256, 26*256, 27*256, 28*256, 29*256, 30*256, 31*256, }, 32*256, }; static GFXDECODE_START( gstream ) GFXDECODE_ENTRY( REGION_GFX2, 0, layout32x32, 0, 0x80 ) GFXDECODE_ENTRY( REGION_GFX1, 0, layout16x16, 0, 0x80 ) GFXDECODE_END static TILE_GET_INFO( get_gs1_tile_info ) { int tileno, palette; tileno = (gstream_vram[tile_index+0x000/4]&0x0fff0000)>>16; palette = (gstream_vram[tile_index+0x000/4]&0xc0000000)>>30; SET_TILE_INFO(0,tileno,palette+0x10,0); } static TILE_GET_INFO( get_gs2_tile_info ) { int tileno, palette; tileno = (gstream_vram[tile_index+0x400/4]&0x0fff0000)>>16; palette =(gstream_vram[tile_index+0x400/4]&0xc0000000)>>30; SET_TILE_INFO(0,tileno+0x1000,palette+0x14,0); } static TILE_GET_INFO( get_gs3_tile_info ) { int tileno, palette; tileno = (gstream_vram[tile_index+0x800/4]&0x0fff0000)>>16; palette =(gstream_vram[tile_index+0x800/4]&0xc0000000)>>30; SET_TILE_INFO(0,tileno+0x2000,palette+0x18,0); } VIDEO_START(gstream) { gstream_tilemap1 = tilemap_create(get_gs1_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN, 32, 32,16,16); gstream_tilemap2 = tilemap_create(get_gs2_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN, 32, 32,16,16); gstream_tilemap3 = tilemap_create(get_gs3_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN, 32, 32,16,16); tilemap_set_transparent_pen(gstream_tilemap1,0); tilemap_set_transparent_pen(gstream_tilemap2,0); } VIDEO_UPDATE(gstream) { /* The tilemaps and sprite sre interleaved together. Even Words are tilemap tiles Odd Words are sprite data Sprites start at the top of memory, tilemaps at the bottom, but the areas can overlap *What seems an actual game bug* when a sprite ends up with a negative co-ordinate a value of 0xfffffffe gets set in the sprite list. this could corrupt the tile value as both words are being set ?! */ int i; //popmessage("(1) %08x %08x (2) %08x %08x (3) %08x %08x", tilemap1_scrollx, tilemap1_scrolly, tilemap2_scrollx, tilemap2_scrolly, tilemap3_scrollx, tilemap3_scrolly ); tilemap_set_scrollx( gstream_tilemap3, 0, tilemap3_scrollx>>16 ); tilemap_set_scrolly( gstream_tilemap3, 0, tilemap3_scrolly>>16 ); tilemap_set_scrollx( gstream_tilemap1, 0, tilemap1_scrollx>>16 ); tilemap_set_scrolly( gstream_tilemap1, 0, tilemap1_scrolly>>16 ); tilemap_set_scrollx( gstream_tilemap2, 0, tilemap2_scrollx>>16 ); tilemap_set_scrolly( gstream_tilemap2, 0, tilemap2_scrolly>>16 ); tilemap_draw(bitmap,cliprect,gstream_tilemap3,0,0); tilemap_draw(bitmap,cliprect,gstream_tilemap2,0,0); tilemap_draw(bitmap,cliprect,gstream_tilemap1,0,0); for (i=0x0000/4;i<0x4000/4;i+=4) { /* Upper bits are used by the tilemaps */ int code = gstream_vram[i+0] & 0xffff; int x = gstream_vram[i+1] & 0xffff; int y = gstream_vram[i+2] & 0xffff; int col = gstream_vram[i+3] & 0x1f; /* co-ordinates are signed */ if (x & 0x8000) x-=0x10000; if (y & 0x8000) y-=0x10000; drawgfx(bitmap,machine->gfx[1],code,col,0,0,x-2,y,cliprect,TRANSPARENCY_PEN,0); } return 0; } static MACHINE_DRIVER_START( gstream ) MDRV_CPU_ADD_TAG("main", E132XT, 16000000) /* 16 Mhz? */ MDRV_CPU_PROGRAM_MAP(gstream_32bit_map,0) MDRV_CPU_IO_MAP(gstream_io,0) MDRV_CPU_VBLANK_INT(irq5_line_hold,1) MDRV_SCREEN_REFRESH_RATE(60) MDRV_SCREEN_VBLANK_TIME(DEFAULT_60HZ_VBLANK_DURATION) /* video hardware */ MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER) MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16) MDRV_SCREEN_SIZE(320, 240) MDRV_SCREEN_VISIBLE_AREA(0, 319, 0, 239) MDRV_PALETTE_LENGTH(0x1000 + 0x400 + 0x400 + 0x400) // sprites + 3 bg layers MDRV_GFXDECODE(gstream) MDRV_NVRAM_HANDLER(generic_1fill) MDRV_VIDEO_START(gstream) MDRV_VIDEO_UPDATE(gstream) MDRV_SPEAKER_STANDARD_MONO("mono") MDRV_SOUND_ADD(OKIM6295, 1000000) /* 1 Mhz? */ MDRV_SOUND_CONFIG(okim6295_interface_region_1_pin7low) // pin 7 not verified MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50) MDRV_SOUND_ADD(OKIM6295, 1000000) /* 1 Mhz? */ MDRV_SOUND_CONFIG(okim6295_interface_region_2_pin7low) // pin 7 not verified MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50) MACHINE_DRIVER_END ROM_START( gstream ) ROM_REGION32_BE( 0x080000, REGION_USER1, 0 ) /* Hyperstone CPU Code */ ROM_LOAD( "u56.bin", 0x000000, 0x080000, CRC(0d0c6a38) SHA1(a810bfc1c9158cccc37710d0ea7268e26e520cc2) ) ROM_REGION32_BE( 0x200000, REGION_USER2, 0 ) /* Hyperstone CPU Code */ ROM_LOAD16_WORD_SWAP( "gs_prg_02.bin", 0x000000, 0x200000, CRC(2f8a6bea) SHA1(c0a32838f4bd8599f09002139f87562db625c1c5) ) ROM_REGION( 0x1000000, REGION_GFX1, ROMREGION_DISPOSE ) /* sprite tiles (16x16x8) */ ROM_LOAD32_WORD( "gs_gr_07.bin", 0x000000, 0x200000, CRC(84e66fe1) SHA1(73d828714f9ed9baffdc06998f5bf3298396fe9c) ) ROM_LOAD32_WORD( "gs_gr_11.bin", 0x000002, 0x200000, CRC(946d71d1) SHA1(516bd3f4d7f5bce59f0593ed6565114dbd5a4ef0) ) ROM_LOAD32_WORD( "gs_gr_08.bin", 0x400000, 0x200000, CRC(abd0d6aa) SHA1(dd294bbdda05697df84247257f735ab51bc26ca3) ) ROM_LOAD32_WORD( "gs_gr_12.bin", 0x400002, 0x200000, CRC(94b56e4e) SHA1(7c3877f993e575326dbd4c2e5d7570747277b20d) ) ROM_LOAD32_WORD( "gs_gr_09.bin", 0x800000, 0x200000, CRC(f2c4fd77) SHA1(284c850688e3c0fd292a91a53e24fe3436dc4076) ) ROM_LOAD32_WORD( "gs_gr_13.bin", 0x800002, 0x200000, CRC(7daaeff0) SHA1(5766d9a3a8c0931305424e0089108ce8df7dfe41) ) ROM_LOAD32_WORD( "gs_gr_10.bin", 0xc00000, 0x200000, CRC(d696d15d) SHA1(85aaa5cdb35f3a8d3266bb8debec0558c860cb53) ) ROM_LOAD32_WORD( "gs_gr_14.bin", 0xc00002, 0x200000, CRC(6bd2a1e1) SHA1(aedca91643f14ececc101a7708255ce9b1d70f68) ) ROM_REGION( 0xc00000, REGION_GFX2, ROMREGION_DISPOSE ) /* bg tiles (32x32x8) */ ROM_LOAD( "gs_gr_01.bin", 0x000000, 0x200000, CRC(b82cfab8) SHA1(08f0eaef5c927fb056c6cc9342e39f445aae9062) ) ROM_LOAD( "gs_gr_02.bin", 0x200000, 0x200000, CRC(37e19cbd) SHA1(490ebb037fce09100ec4bba3f73ecdf101526641) ) ROM_LOAD( "gs_gr_03.bin", 0x400000, 0x200000, CRC(1a3b2b11) SHA1(a4b1dc1a9709f8f8f2ab2190d7badc246caa540f) ) ROM_LOAD( "gs_gr_04.bin", 0x600000, 0x200000, CRC(a4e8906c) SHA1(b285d7697cdaa62014cf65d09a19fcbd6a95bb98) ) ROM_LOAD( "gs_gr_05.bin", 0x800000, 0x200000, CRC(ef283a73) SHA1(8b598facb344eac33138611abc141a2acb375983) ) ROM_LOAD( "gs_gr_06.bin", 0xa00000, 0x200000, CRC(d4e3a2b2) SHA1(4577c007172c718bf7ca55a8ccee5455c281026c) ) ROM_REGION( 0x200000, REGION_SOUND1, 0 ) ROM_LOAD( "gs_snd_01.bin", 0x000000, 0x080000, CRC(79b64d3f) SHA1(b2166210d3a3b85b9ace90749a444c881f69d551) ) ROM_LOAD( "gs_snd_02.bin", 0x080000, 0x080000, CRC(e49ed92c) SHA1(a3d7b3fe93a786a246acf2657d9056398c793078) ) ROM_LOAD( "gs_snd_03.bin", 0x100000, 0x080000, CRC(2bfff4ac) SHA1(cce1bb3c78b86722c926854c737f9589806012ba) ) ROM_LOAD( "gs_snd_04.bin", 0x180000, 0x080000, CRC(b259de3b) SHA1(1a64f41d4344fefad5832332f1a7655e23f6b017) ) ROM_REGION( 0x200000, REGION_SOUND2, 0 ) ROM_COPY( REGION_SOUND1, 0, 0, 0x200000 ) ROM_END static READ32_HANDLER( gstream_speedup_r ) { if (activecpu_get_pc()==0xc0001592) { cpu_spinuntil_int(); } return gstream_workram[0xd1ee0/4]; } static DRIVER_INIT( gstream ) { memory_install_read32_handler(0, ADDRESS_SPACE_PROGRAM, 0xd1ee0, 0xd1ee3, 0, 0, gstream_speedup_r ); } GAME( 2002, gstream, 0, gstream, gstream, gstream, ROT270, "Oriental Soft Japan", "G-Stream G2020", GAME_IMPERFECT_SOUND )