自学教程：C++ ATTOSECONDS_IN_USEC函数代码示例

	MCFG_CPU_ADD("audiocpu", Z80, 4000000) // ?	MCFG_CPU_PROGRAM_MAP(sound_map)	MCFG_CPU_PERIODIC_INT_DRIVER(wyvernf0_state, irq0_line_hold, 60*2)  // IRQ generated by ??? (drives music tempo), NMI by main cpu//  MCFG_CPU_ADD("mcu", M68705, 4000000) // ?//  MCFG_CPU_PROGRAM_MAP(mcu_map)//  MCFG_QUANTUM_TIME(attotime::from_hz(6000)) // 100 CPU slices per second to synchronize between the MCU and the main CPU	MCFG_MACHINE_START_OVERRIDE(wyvernf0_state,wyvernf0)	MCFG_MACHINE_RESET_OVERRIDE(wyvernf0_state,wyvernf0)	// video hardware	MCFG_SCREEN_ADD("screen", RASTER)	MCFG_SCREEN_REFRESH_RATE(60)	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))	MCFG_SCREEN_SIZE(32*8, 32*8)	MCFG_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 2*8, 30*8-1)	MCFG_SCREEN_UPDATE_DRIVER(wyvernf0_state, screen_update_wyvernf0)	MCFG_SCREEN_PALETTE("palette")	MCFG_GFXDECODE_ADD("gfxdecode", "palette", wyvernf0)	MCFG_PALETTE_ADD("palette", 512)	MCFG_PALETTE_FORMAT(xxxxRRRRGGGGBBBB)	MCFG_PALETTE_ENDIANNESS(ENDIANNESS_BIG)	MCFG_VIDEO_START_OVERRIDE(wyvernf0_state,wyvernf0)	// sound hardware	MCFG_SPEAKER_STANDARD_MONO("mono")

 *  Machine driver * *************************************/static MACHINE_CONFIG_START( canyon, canyon_state )	/* basic machine hardware */	MCFG_CPU_ADD("maincpu", M6502, XTAL_12_096MHz / 16)	MCFG_CPU_PROGRAM_MAP(main_map)	MCFG_CPU_VBLANK_INT("screen", nmi_line_pulse)	MCFG_WATCHDOG_VBLANK_INIT(8)	/* video hardware */	MCFG_SCREEN_ADD("screen", RASTER)	MCFG_SCREEN_REFRESH_RATE(60)	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(22 * 1000000 / 15750))	MCFG_SCREEN_SIZE(256, 240)	MCFG_SCREEN_VISIBLE_AREA(0, 255, 0, 239)	MCFG_SCREEN_UPDATE_STATIC(canyon)	MCFG_GFXDECODE(canyon)	MCFG_PALETTE_LENGTH(4)	MCFG_PALETTE_INIT(canyon)	MCFG_VIDEO_START(canyon)	/* sound hardware */	MCFG_SPEAKER_STANDARD_STEREO("lspeaker", "rspeaker")	MCFG_SOUND_ADD("discrete", DISCRETE, 0)	MCFG_SOUND_CONFIG_DISCRETE(canyon)

MCFG_CPU_ADD("mcu", M68705, 4000000) /* xtal is 4MHz, divided by 4 internally */MCFG_CPU_PROGRAM_MAP(mexico86_m68705_map)MCFG_CPU_VBLANK_INT_DRIVER("screen", mexico86_state, mexico86_m68705_interrupt)MCFG_CPU_ADD("sub", Z80, 8000000/2)      /* 4 MHz, Uses 8Mhz OSC */MCFG_CPU_PROGRAM_MAP(mexico86_sub_cpu_map)MCFG_CPU_VBLANK_INT_DRIVER("screen", mexico86_state,  irq0_line_hold)MCFG_QUANTUM_TIME(attotime::from_hz(6000))    /* 100 CPU slices per frame - an high value to ensure proper synchronization of the CPUs *//* video hardware */MCFG_SCREEN_ADD("screen", RASTER)MCFG_SCREEN_REFRESH_RATE(60)MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0)  /* frames per second, vblank duration */)MCFG_SCREEN_SIZE(32*8, 32*8)MCFG_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 2*8, 30*8-1)MCFG_SCREEN_UPDATE_DRIVER(mexico86_state, screen_update_mexico86)MCFG_SCREEN_PALETTE("palette")MCFG_GFXDECODE_ADD("gfxdecode", mexico86)MCFG_PALETTE_ADD_RRRRGGGGBBBB_PROMS("palette", 256)/* sound hardware */MCFG_SPEAKER_STANDARD_MONO("mono")MCFG_SOUND_ADD("ymsnd", YM2203, 3000000)MCFG_YM2203_AY8910_INTF(&ay8910_config)MCFG_SOUND_ROUTE(0, "mono", 0.30)MCFG_SOUND_ROUTE(1, "mono", 0.30)

	GFXDECODE_ENTRY( "gfx2", 0, trckydoc_spritelayout, 0, 64 )GFXDECODE_ENDstatic MACHINE_CONFIG_START( tecfri, sauro_state )	/* basic machine hardware */	MCFG_CPU_ADD("maincpu", Z80, XTAL_20MHz/4)       /* verified on pcb */	MCFG_CPU_VBLANK_INT_DRIVER("screen", sauro_state,  irq0_line_hold)	MCFG_NVRAM_ADD_1FILL("nvram")	/* video hardware */	MCFG_SCREEN_ADD("screen", RASTER)	MCFG_SCREEN_REFRESH_RATE(55.72)   /* verified on pcb */	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(5000))  // frames per second, vblank duration (otherwise sprites lag)	MCFG_SCREEN_SIZE(32 * 8, 32 * 8)	MCFG_SCREEN_VISIBLE_AREA(1 * 8, 31 * 8 - 1, 2 * 8, 30 * 8 - 1)	MCFG_SCREEN_PALETTE("palette")	MCFG_PALETTE_ADD_RRRRGGGGBBBB_PROMS("palette", 1024)	/* sound hardware */	MCFG_SPEAKER_STANDARD_MONO("mono")	MCFG_SOUND_ADD("ymsnd", YM3812, XTAL_20MHz/8)       /* verified on pcb */	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)MACHINE_CONFIG_ENDstatic MACHINE_CONFIG_DERIVED( trckydoc, tecfri )

	device.execute().set_input_line(INPUT_LINE_IRQ1, ASSERT_LINE);	device.execute().set_input_line(INPUT_LINE_IRQ3, ASSERT_LINE);}static MACHINE_CONFIG_START( konendev, konendev_state )	/* basic machine hardware */	MCFG_CPU_ADD("maincpu", PPC403GCX, 32000000) // Clock unknown	MCFG_CPU_PROGRAM_MAP(konendev_map)	MCFG_CPU_VBLANK_INT_DRIVER("screen", konendev_state, vbl_interrupt)	/* video hardware */	MCFG_PALETTE_ADD_RRRRRGGGGGBBBBB("palette")	MCFG_SCREEN_ADD("screen", RASTER)	MCFG_SCREEN_REFRESH_RATE(60)	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) // Not accurate	MCFG_SCREEN_SIZE(640, 480)	MCFG_SCREEN_VISIBLE_AREA(0, 639, 0, 479)	MCFG_SCREEN_UPDATE_DRIVER(konendev_state, screen_update)	MCFG_SCREEN_PALETTE("palette")	MCFG_DEVICE_ADD("gcu", K057714, 0)	MCFG_K057714_IRQ_CALLBACK(WRITELINE(konendev_state, gcu_interrupt))	MCFG_NVRAM_ADD_0FILL("nvram0")	MCFG_NVRAM_ADD_0FILL("nvram1")	MCFG_EEPROM_SERIAL_93C56_ADD("eeprom")	/* sound hardware */	MCFG_SPEAKER_STANDARD_STEREO("lspeaker", "rspeaker")

/*** MACHINE DRIVER **********************************************************/static MACHINE_CONFIG_START( gstriker, gstriker_state )	MCFG_CPU_ADD("maincpu", M68000, 10000000)	MCFG_CPU_PROGRAM_MAP(gstriker_map)	MCFG_CPU_VBLANK_INT_DRIVER("screen", gstriker_state,  irq1_line_hold)	MCFG_CPU_ADD("audiocpu", Z80,8000000/2) /* 4 MHz ??? */	MCFG_CPU_PROGRAM_MAP(sound_map)	MCFG_CPU_IO_MAP(sound_io_map)	MCFG_SCREEN_ADD("screen", RASTER)//  MCFG_SCREEN_VIDEO_ATTRIBUTES(VIDEO_UPDATE_AFTER_VBLANK)	MCFG_SCREEN_REFRESH_RATE(60)	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(5000) /* hand-tuned, it needs a bit */)	MCFG_SCREEN_SIZE(64*8, 64*8)	MCFG_SCREEN_VISIBLE_AREA(0*8, 40*8-1, 0*8, 28*8-1)	MCFG_SCREEN_UPDATE_DRIVER(gstriker_state, screen_update_gstriker)	MCFG_SCREEN_PALETTE("palette")	MCFG_GFXDECODE_ADD("gfxdecode", "palette", gstriker)	MCFG_PALETTE_ADD("palette", 0x800)	MCFG_PALETTE_FORMAT(xRRRRRGGGGGBBBBB)	MCFG_DEVICE_ADD("zoomtilemap", MB60553, 0)	MCFG_MB60553_GFXDECODE("gfxdecode")	MCFG_DEVICE_ADD("texttilemap", VS920A, 0)	MCFG_VS920A_GFXDECODE("gfxdecode")