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Diffstat (limited to 'src/mame/drivers/groundfx.cpp')
-rw-r--r-- | src/mame/drivers/groundfx.cpp | 445 |
1 files changed, 445 insertions, 0 deletions
diff --git a/src/mame/drivers/groundfx.cpp b/src/mame/drivers/groundfx.cpp new file mode 100644 index 00000000000..ef3386c9985 --- /dev/null +++ b/src/mame/drivers/groundfx.cpp @@ -0,0 +1,445 @@ +// license:BSD-3-Clause +// copyright-holders:Bryan McPhail, David Graves +/*************************************************************************** + + Ground Effects / Super Ground FX (c) 1993 Taito + + Driver by Bryan McPhail & David Graves. + + Board Info: + + K1100744A + J1100316A + Sticker - K11J0744A + ------------------------------------------------------------------------------------------------ + | 2018 2088 43256 43256 MC68EC020RP25 DIP-SW (8) COM20020 SLIDE-SW LAN-IN | Connector G + | 2018 2088 D51-21 D51-22 D51-14 | ----------- + | 2018 2088 43256 43256 (PAL16L8) | Parts | Solder + | D51-15 ADC0809 LAN-OUT | ------------------ + | 2018 D51-23 D51-24 (PAL16L8) | GND 1 A GND + | D51-16-1 JP4 | GND 2 B GND + | 2018 TC0570SPC (PAL16L8) EEPROM.164 1-2 | +12 3 C +12 + | 2018 2-3 | +5 4 D +5 + | TC0510NIO 2-3 --| +5 5 E +5 + | D51-13 D51-03 2-3 | +5 6 F +5 + | D51-04 43256 1-2 | 7 H + | TC0470LIN D51-05 1-2 --| +13 8 J +13 + | D51-06 43256 TC0650FCA 1-2 | +13 9 K +13 + | D51-07 2-3 | SPK_R+ 10 L SPK_R- + | TC0580PIV 43256 43256 2018 2-3 | SPK_L+ 11 M SPK_L- + | 43256 D51-17 | SPK_REAR- 12 N SPK_REAR- + | 514256 TC0480SCP (PAL16L8) | 13 P + | 514256 G| RED 14 R GREEN + | 514256 D51-10 | BLUE 15 S SYNC + | 514256 D51-09 D51-11 TC0620SCC | V-GND 16 T + | 514256 D51-08 D51012 | METER1 17 U METER2 + | 514256 43256 | LOCKOUT1 18 V LOCKOUT2 + | MB8421 43256 | 19 W + | D51-18 MB8421 ENSONIC --| COIN1 20 X COIN2 + | (PAL20L8) D51-29 OTISR2 43256 MB87078 | SERVICE 21 Y TEST + | D51-01 | 22 Z + | D51-19 43256 ENSONIC ENSONIC --| SHIFT UP 23 a BRAKE + | (PAL20L8) D51-02 SUPER GLU ESP-R6 TC511664 TL074 TL074 | HANDLE VR 24 b ACCEL VR + | D51-30 | SHIFT DN 25 c + | MC68000P12F16MHz TDA1543 TDA1543 | 26 d + | 40MHz 16MHz 30.476MHz MC68681 | GND 27 e GND + | D51-20 | GND 28 f GND + | (PAL20L8) | + ------------------------------------------------------------------------------------------------ + + + Ground Effects combines the sprite system used in Taito Z games with + the TC0480SCP tilemap chip plus some features from the Taito F3 system. + It has an extra TC0620SCC tilemap chip which is a 6bpp version of the + TC0100SCN (check the inits), like Under Fire. + + Ground Effects is effectively a 30Hz game - though the vblank interrupts + still come in at 60Hz, the game uses a hardware frame counter to limit + itself to 30Hz (it only updates things like the video registers every + other vblank). There isn't enough cpu power in a 20MHz 68020 to run + this game at 60Hz. + + Ground Effects has a network mode - probably uses IRQ 6 and the unknown + ports at 0xc00000. + +***************************************************************************/ + +#include "emu.h" +#include "cpu/m68000/m68000.h" +#include "machine/eepromser.h" +#include "sound/es5506.h" +#include "audio/taito_en.h" +#include "includes/groundfx.h" + + +/*********************************************************** + INTERRUPTS +***********************************************************/ + +void groundfx_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) +{ + switch (id) + { + case TIMER_GROUNDFX_INTERRUPT5: + m_maincpu->set_input_line(5, HOLD_LINE); //from 5... ADC port + break; + default: + assert_always(FALSE, "Unknown id in groundfx_state::device_timer"); + } +} + + +/********************************************************** + GAME INPUTS +**********************************************************/ + +CUSTOM_INPUT_MEMBER(groundfx_state::frame_counter_r) +{ + return m_frame_counter; +} + +CUSTOM_INPUT_MEMBER(groundfx_state::coin_word_r) +{ + return m_coin_word; +} + +WRITE32_MEMBER(groundfx_state::groundfx_input_w) +{ + switch (offset) + { + case 0x00: + if (ACCESSING_BITS_24_31) /* $500000 is watchdog */ + { + machine().watchdog_reset(); + } + + if (ACCESSING_BITS_0_7) + { + ioport("EEPROMOUT")->write(data, 0xff); + } + + break; + + case 0x01: + if (ACCESSING_BITS_24_31) + { + coin_lockout_w(machine(), 0,~data & 0x01000000); + coin_lockout_w(machine(), 1,~data & 0x02000000); + coin_counter_w(machine(), 0, data & 0x04000000); + coin_counter_w(machine(), 1, data & 0x08000000); + m_coin_word = (data >> 16) &0xffff; + } + break; + } +} + +READ32_MEMBER(groundfx_state::groundfx_adc_r) +{ + return (ioport("AN0")->read() << 8) | ioport("AN1")->read(); +} + +WRITE32_MEMBER(groundfx_state::groundfx_adc_w) +{ + /* One interrupt per input port (4 per frame, though only 2 used). + 1000 cycle delay is arbitrary */ + timer_set(downcast<cpu_device *>(&space.device())->cycles_to_attotime(1000), TIMER_GROUNDFX_INTERRUPT5); +} + +WRITE32_MEMBER(groundfx_state::rotate_control_w)/* only a guess that it's rotation */ +{ + if (ACCESSING_BITS_0_15) + { + m_rotate_ctrl[m_port_sel] = data; + return; + } + + if (ACCESSING_BITS_16_31) + { + m_port_sel = (data &0x70000) >> 16; + } +} + + +WRITE32_MEMBER(groundfx_state::motor_control_w) +{ +/* + Standard value poked is 0x00910200 (we ignore lsb and msb + which seem to be always zero) + + 0x0, 0x8000 and 0x9100 are written at startup + + Two bits are written in test mode to this middle word + to test gun vibration: + + ........ .x...... P1 gun vibration + ........ x....... P2 gun vibration +*/ +} + +/*********************************************************** + MEMORY STRUCTURES +***********************************************************/ + +static ADDRESS_MAP_START( groundfx_map, AS_PROGRAM, 32, groundfx_state ) + AM_RANGE(0x000000, 0x1fffff) AM_ROM + AM_RANGE(0x200000, 0x21ffff) AM_RAM AM_SHARE("ram") /* main CPUA ram */ + AM_RANGE(0x300000, 0x303fff) AM_RAM AM_SHARE("spriteram") /* sprite ram */ + AM_RANGE(0x400000, 0x400003) AM_WRITE(motor_control_w) /* gun vibration */ + AM_RANGE(0x500000, 0x500003) AM_READ_PORT("BUTTONS") + AM_RANGE(0x500004, 0x500007) AM_READ_PORT("SYSTEM") + AM_RANGE(0x500000, 0x500007) AM_WRITE(groundfx_input_w) /* eeprom etc. */ + AM_RANGE(0x600000, 0x600003) AM_READWRITE(groundfx_adc_r,groundfx_adc_w) + AM_RANGE(0x700000, 0x7007ff) AM_RAM AM_SHARE("snd_shared") + AM_RANGE(0x800000, 0x80ffff) AM_DEVREADWRITE("tc0480scp", tc0480scp_device, long_r, long_w) /* tilemaps */ + AM_RANGE(0x830000, 0x83002f) AM_DEVREADWRITE("tc0480scp", tc0480scp_device, ctrl_long_r, ctrl_long_w) // debugging + AM_RANGE(0x900000, 0x90ffff) AM_DEVREADWRITE("tc0100scn", tc0100scn_device, long_r, long_w) /* 6bpp tilemaps */ + AM_RANGE(0x920000, 0x92000f) AM_DEVREADWRITE("tc0100scn", tc0100scn_device, ctrl_long_r, ctrl_long_w) + AM_RANGE(0xa00000, 0xa0ffff) AM_RAM_DEVWRITE("palette", palette_device, write) AM_SHARE("palette") + AM_RANGE(0xb00000, 0xb003ff) AM_RAM // ?? single bytes, blending ?? + AM_RANGE(0xc00000, 0xc00007) AM_READNOP /* Network? */ + AM_RANGE(0xd00000, 0xd00003) AM_WRITE(rotate_control_w) /* perhaps port based rotate control? */ + /* f00000 is seat control? */ +ADDRESS_MAP_END + +/*********************************************************** + INPUT PORTS (dips in eprom) +***********************************************************/ + +static INPUT_PORTS_START( groundfx ) + PORT_START("BUTTONS") + PORT_BIT( 0x00000001, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, groundfx_state,frame_counter_r, NULL) + PORT_BIT( 0x00000002, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x00000004, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x00000008, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x00000010, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x00000020, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x00000040, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x00000080, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_READ_LINE_DEVICE_MEMBER("eeprom", eeprom_serial_93cxx_device, do_read) + PORT_BIT( 0x00000100, IP_ACTIVE_LOW, IPT_BUTTON3 ) /* shift hi */ + PORT_BIT( 0x00000200, IP_ACTIVE_LOW, IPT_BUTTON1 ) /* brake */ + PORT_BIT( 0x00000400, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x00000800, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x00001000, IP_ACTIVE_LOW, IPT_BUTTON2 ) /* shift low */ + PORT_BIT( 0x00002000, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x00004000, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x00008000, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0xffff0000, IP_ACTIVE_LOW, IPT_UNUSED ) + + PORT_START( "EEPROMOUT" ) + PORT_BIT( 0x00000010, IP_ACTIVE_HIGH, IPT_OUTPUT ) PORT_WRITE_LINE_DEVICE_MEMBER("eeprom", eeprom_serial_93cxx_device, cs_write) + PORT_BIT( 0x00000020, IP_ACTIVE_HIGH, IPT_OUTPUT ) PORT_WRITE_LINE_DEVICE_MEMBER("eeprom", eeprom_serial_93cxx_device, clk_write) + PORT_BIT( 0x00000040, IP_ACTIVE_HIGH, IPT_OUTPUT ) PORT_WRITE_LINE_DEVICE_MEMBER("eeprom", eeprom_serial_93cxx_device, di_write) + + PORT_START("SYSTEM") + PORT_SERVICE_NO_TOGGLE( 0x00000001, IP_ACTIVE_LOW ) + PORT_BIT( 0x00000002, IP_ACTIVE_LOW, IPT_SERVICE1 ) + PORT_BIT( 0x00000004, IP_ACTIVE_LOW, IPT_COIN1 ) + PORT_BIT( 0x00000008, IP_ACTIVE_LOW, IPT_COIN2 ) + PORT_BIT( 0x00000010, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x00000020, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x00000040, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x00000080, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0xffff0000, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, groundfx_state,coin_word_r, NULL) + + PORT_START("AN0") /* IN 2, steering wheel */ + PORT_BIT( 0xff, 0x7f, IPT_AD_STICK_X ) PORT_SENSITIVITY(25) PORT_KEYDELTA(15) PORT_REVERSE PORT_PLAYER(1) + + PORT_START("AN1") /* IN 3, accel */ + PORT_BIT( 0xff, 0x00, IPT_AD_STICK_Y ) PORT_SENSITIVITY(20) PORT_KEYDELTA(10) PORT_PLAYER(1) + + PORT_START("AN2") /* IN 4, sound volume */ + PORT_BIT( 0xff, 0x00, IPT_AD_STICK_X ) PORT_SENSITIVITY(20) PORT_KEYDELTA(10) PORT_REVERSE PORT_PLAYER(2) + + PORT_START("AN3") /* IN 5, unknown */ + PORT_BIT( 0xff, 0x00, IPT_AD_STICK_Y ) PORT_SENSITIVITY(20) PORT_KEYDELTA(10) PORT_PLAYER(2) +INPUT_PORTS_END + +/********************************************************** + GFX DECODING +**********************************************************/ + +static const gfx_layout tile16x16_layout = +{ + 16,16, /* 16*16 sprites */ + RGN_FRAC(1,2), + 5, /* 5 bits per pixel */ + { RGN_FRAC(1,2), 0, 8, 16, 24 }, + { 32, 33, 34, 35, 36, 37, 38, 39, 0, 1, 2, 3, 4, 5, 6, 7 }, + { 0*64, 1*64, 2*64, 3*64, 4*64, 5*64, 6*64, 7*64, + 8*64, 9*64, 10*64, 11*64, 12*64, 13*64, 14*64, 15*64 }, + 64*16 /* every sprite takes 128 consecutive bytes */ +}; + +static const gfx_layout charlayout = +{ + 16,16, /* 16*16 characters */ + RGN_FRAC(1,1), + 4, /* 4 bits per pixel */ + { 0, 1, 2, 3 }, + { 1*4, 0*4, 5*4, 4*4, 3*4, 2*4, 7*4, 6*4, 9*4, 8*4, 13*4, 12*4, 11*4, 10*4, 15*4, 14*4 }, + { 0*64, 1*64, 2*64, 3*64, 4*64, 5*64, 6*64, 7*64, 8*64, 9*64, 10*64, 11*64, 12*64, 13*64, 14*64, 15*64 }, + 128*8 /* every sprite takes 128 consecutive bytes */ +}; + +static const gfx_layout scclayout = +{ + 8,8, /* 8*8 characters */ + RGN_FRAC(1,2), + 6, /* 4 bits per pixel */ + { RGN_FRAC(1,2), RGN_FRAC(1,2)+1, 0, 1, 2, 3 }, + { 2*4, 3*4, 0*4, 1*4, 6*4, 7*4, 4*4, 5*4 }, + { 0*32, 1*32, 2*32, 3*32, 4*32, 5*32, 6*32, 7*32 }, + 32*8 /* every sprite takes 32 consecutive bytes */ +}; + +static GFXDECODE_START( groundfx ) + GFXDECODE_ENTRY( "gfx2", 0x0, tile16x16_layout, 4096, 512 ) + GFXDECODE_ENTRY( "gfx1", 0x0, charlayout, 0, 512 ) + GFXDECODE_ENTRY( "gfx3", 0x0, scclayout, 0, 512 ) +GFXDECODE_END + + +/*********************************************************** + MACHINE DRIVERS +***********************************************************/ + +INTERRUPT_GEN_MEMBER(groundfx_state::groundfx_interrupt) +{ + m_frame_counter^=1; + device.execute().set_input_line(4, HOLD_LINE); +} + +static MACHINE_CONFIG_START( groundfx, groundfx_state ) + + /* basic machine hardware */ + MCFG_CPU_ADD("maincpu", M68EC020, XTAL_40MHz/2) /* 20MHz - verified */ + MCFG_CPU_PROGRAM_MAP(groundfx_map) + MCFG_CPU_VBLANK_INT_DRIVER("screen", groundfx_state, groundfx_interrupt) + + MCFG_EEPROM_SERIAL_93C46_ADD("eeprom") + + /* video hardware */ + MCFG_SCREEN_ADD("screen", RASTER) + MCFG_SCREEN_REFRESH_RATE(60) + MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0)) + MCFG_SCREEN_SIZE(40*8, 32*8) + MCFG_SCREEN_VISIBLE_AREA(0, 40*8-1, 3*8, 32*8-1) + MCFG_SCREEN_UPDATE_DRIVER(groundfx_state, screen_update_groundfx) + MCFG_SCREEN_PALETTE("palette") + + MCFG_GFXDECODE_ADD("gfxdecode", "palette", groundfx) + MCFG_PALETTE_ADD("palette", 16384) + MCFG_PALETTE_FORMAT(XRGB) + + MCFG_DEVICE_ADD("tc0100scn", TC0100SCN, 0) + MCFG_TC0100SCN_GFX_REGION(2) + MCFG_TC0100SCN_TX_REGION(3) + MCFG_TC0100SCN_OFFSETS(50, 8) + MCFG_TC0100SCN_GFXDECODE("gfxdecode") + MCFG_TC0100SCN_PALETTE("palette") + + MCFG_DEVICE_ADD("tc0480scp", TC0480SCP, 0) + MCFG_TC0480SCP_GFX_REGION(1) + MCFG_TC0480SCP_TX_REGION(4) + MCFG_TC0480SCP_OFFSETS(0x24, 0) + MCFG_TC0480SCP_OFFSETS_TX(-1, 0) + MCFG_TC0480SCP_GFXDECODE("gfxdecode") + MCFG_TC0480SCP_PALETTE("palette") + + /* sound hardware */ + MCFG_FRAGMENT_ADD(taito_en_sound) +MACHINE_CONFIG_END + +/*************************************************************************** + DRIVERS +***************************************************************************/ + +ROM_START( groundfx ) + ROM_REGION( 0x200000, "maincpu", 0 ) /* 2048K for 68020 code (CPU A) */ + ROM_LOAD32_BYTE( "d51-24.79", 0x00000, 0x80000, CRC(5caaa031) SHA1(03e727e26df701e3f5e16c5f933d5b29a528945a) ) + ROM_LOAD32_BYTE( "d51-23.61", 0x00001, 0x80000, CRC(462e3c9b) SHA1(7f116ee755748497b911868a948d3e3b5134e475) ) + ROM_LOAD32_BYTE( "d51-22.77", 0x00002, 0x80000, CRC(b6b04d88) SHA1(58685ee8fd788dcbfe318f1e3c06d93e2128034c) ) + ROM_LOAD32_BYTE( "d51-21.59", 0x00003, 0x80000, CRC(21ecde2b) SHA1(c6d3738f34c8e24346e7784b14aeff300ae2d225) ) + + ROM_REGION( 0x180000, "audiocpu", 0 ) + ROM_LOAD16_BYTE( "d51-29.54", 0x100000, 0x40000, CRC(4b64f41d) SHA1(040427668d13f7320d23805098d6d0e1aa8d121e) ) + ROM_LOAD16_BYTE( "d51-30.56", 0x100001, 0x40000, CRC(45f339fe) SHA1(cc7adfb2b86070f5bb426542e3b7ed2a50b3c39e) ) + + ROM_REGION( 0x400000, "gfx1", 0 ) + ROM_LOAD16_BYTE( "d51-08.35", 0x000000, 0x200000, CRC(835b7a0f) SHA1(0131fceabd73b0045b5d4ae0bb2f03efdd407962) ) /* SCR 16x16 tiles */ + ROM_LOAD16_BYTE( "d51-09.34", 0x000001, 0x200000, CRC(6dabd83d) SHA1(3dbd7ea36b9900faa6420af1f1600efe295db74c) ) + + ROM_REGION( 0x1000000, "gfx2", 0 ) + ROM_LOAD32_BYTE( "d51-03.47", 0x800000, 0x200000, CRC(629a5c99) SHA1(cfc1c0b07ecefd6eddb83edcbcf710e8b8de19e4) ) /* OBJ 16x16 tiles */ + ROM_LOAD32_BYTE( "d51-04.48", 0x000000, 0x200000, CRC(f49b14b7) SHA1(31129771159c1295a074c8311344ece525302289) ) + ROM_LOAD32_BYTE( "d51-05.49", 0x000001, 0x200000, CRC(3a2e2cbf) SHA1(ed2c1ca9211b1d70b4767a54e08263a3e4867199) ) + ROM_LOAD32_BYTE( "d51-06.50", 0x000002, 0x200000, CRC(d33ce2a0) SHA1(92c4504344672ea798cd6dd34f4b46848bf9f82b) ) + ROM_LOAD32_BYTE( "d51-07.51", 0x000003, 0x200000, CRC(24b2f97d) SHA1(6980e67b435d189ce897c0301e0411763410ab47) ) + + ROM_REGION( 0x400000, "gfx3", 0 ) + ROM_LOAD16_BYTE( "d51-10.95", 0x000000, 0x100000, CRC(d5910604) SHA1(8efe13884cfdef208394ddfe19f43eb1b9f78ff3) ) /* SCC 8x8 tiles, 6bpp */ + ROM_LOAD16_BYTE( "d51-11.96", 0x000001, 0x100000, CRC(fee5f5c6) SHA1(1be88747f9c71c348dd61a8f0040007df3a3e6a6) ) + ROM_LOAD ( "d51-12.97", 0x300000, 0x100000, CRC(d630287b) SHA1(2fa09e1821b7280d193ca9a2a270759c3c3189d1) ) + ROM_FILL ( 0x200000, 0x100000, 0 ) + + ROM_REGION16_LE( 0x80000, "user1", 0 ) + ROM_LOAD16_WORD( "d51-13.7", 0x00000, 0x80000, CRC(36921b8b) SHA1(2130120f78a3b984618a53054fc937cf727177b9) ) /* STY, spritemap */ + + ROM_REGION16_BE( 0x1000000, "ensoniq.0", ROMREGION_ERASE00 ) + ROM_LOAD16_BYTE( "d51-01.73", 0x000000, 0x200000, CRC(92f09155) SHA1(8015e1997818bb480174394eb43840bf26679bcf) ) /* Ensoniq samples */ + ROM_LOAD16_BYTE( "d51-02.74", 0xc00000, 0x200000, CRC(20a9428f) SHA1(c9033d02a49c72f704808f5f899101617d5814e5) ) + + ROM_REGION16_BE( 0x80, "eeprom", 0 ) + ROM_LOAD( "93c46.164", 0x0000, 0x0080, CRC(6f58851d) SHA1(33bd4478f097dca6b5d222adb89699c6d35ed009) ) +ROM_END + + +READ32_MEMBER(groundfx_state::irq_speedup_r_groundfx) +{ + cpu_device *cpu = downcast<cpu_device *>(&space.device()); + int ptr; + offs_t sp = cpu->sp(); + if ((sp&2)==0) ptr=m_ram[(sp&0x1ffff)/4]; + else ptr=(((m_ram[(sp&0x1ffff)/4])&0x1ffff)<<16) | + (m_ram[((sp&0x1ffff)/4)+1]>>16); + + if (cpu->pc()==0x1ece && ptr==0x1b9a) + cpu->spin_until_interrupt(); + + return m_ram[0xb574/4]; +} + + +DRIVER_INIT_MEMBER(groundfx_state,groundfx) +{ + UINT32 offset,i; + UINT8 *gfx = memregion("gfx3")->base(); + int size=memregion("gfx3")->bytes(); + int data; + + /* Speedup handlers */ + m_maincpu->space(AS_PROGRAM).install_read_handler(0x20b574, 0x20b577, read32_delegate(FUNC(groundfx_state::irq_speedup_r_groundfx),this)); + + /* make SCC tile GFX format suitable for gfxdecode */ + offset = size/2; + for (i = size/2+size/4; i<size; i++) + { + int d1,d2,d3,d4; + + /* Expand 2bits into 4bits format */ + data = gfx[i]; + d1 = (data>>0) & 3; + d2 = (data>>2) & 3; + d3 = (data>>4) & 3; + d4 = (data>>6) & 3; + + gfx[offset] = (d1<<2) | (d2<<6); + offset++; + + gfx[offset] = (d3<<2) | (d4<<6); + offset++; + } +} + + +GAME( 1992, groundfx, 0, groundfx, groundfx, groundfx_state, groundfx, ROT0, "Taito Corporation", "Ground Effects / Super Ground Effects (Japan)", 0 ) |