diff options
Diffstat (limited to 'trunk/src/mame/audio/targ.c')
-rw-r--r-- | trunk/src/mame/audio/targ.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/trunk/src/mame/audio/targ.c b/trunk/src/mame/audio/targ.c new file mode 100644 index 00000000000..660547bc51c --- /dev/null +++ b/trunk/src/mame/audio/targ.c @@ -0,0 +1,220 @@ +/************************************************************************* + + Targ hardware + +*************************************************************************/ + +/* Sound channel usage + 0 = CPU music, Shoot + 1 = Crash + 2 = Spectar sound + 3 = Tone generator +*/ + +#include "emu.h" +#include "sound/samples.h" +#include "sound/dac.h" +#include "includes/targ.h" + + + +#define SPECTAR_MAXFREQ 525000 +#define TARG_MAXFREQ 125000 + + +static int max_freq; + +static UINT8 port_1_last; +static UINT8 port_2_last; + +static UINT8 tone_freq; +static UINT8 tone_active; +static UINT8 tone_pointer; + + +static const INT16 sine_wave[32] = +{ + 0x0f0f, 0x0f0f, 0x0f0f, 0x0606, 0x0606, 0x0909, 0x0909, 0x0606, 0x0606, 0x0909, 0x0606, 0x0d0d, 0x0f0f, 0x0f0f, 0x0d0d, 0x0000, + -0x191a, -0x2122, -0x1e1f, -0x191a, -0x1314, -0x191a, -0x1819, -0x1819, -0x1819, -0x1314, -0x1314, -0x1314, -0x1819, -0x1e1f, -0x1e1f, -0x1819 +}; + + +/* some macros to make detecting bit changes easier */ +#define RISING_EDGE(bit) ( (data & bit) && !(port_1_last & bit)) +#define FALLING_EDGE(bit) (!(data & bit) && (port_1_last & bit)) + + + +static void adjust_sample(samples_device *samples, UINT8 freq) +{ + tone_freq = freq; + + if ((tone_freq == 0xff) || (tone_freq == 0x00)) + samples->set_volume(3, 0); + else + { + samples->set_frequency(3, 1.0 * max_freq / (0xff - tone_freq)); + samples->set_volume(3, tone_active); + } +} + + +WRITE8_HANDLER( targ_audio_1_w ) +{ + samples_device *samples = space->machine().device<samples_device>("samples"); + + /* CPU music */ + if ((data & 0x01) != (port_1_last & 0x01)) + dac_data_w(space->machine().device("dac"),(data & 0x01) * 0xff); + + /* shot */ + if (FALLING_EDGE(0x02) && !samples->playing(0)) samples->start(0,1); + if (RISING_EDGE(0x02)) samples->stop(0); + + /* crash */ + if (RISING_EDGE(0x20)) + { + if (data & 0x40) + samples->start(1,2); + else + samples->start(1,0); + } + + /* Sspec */ + if (data & 0x10) + samples->stop(2); + else + { + if ((data & 0x08) != (port_1_last & 0x08)) + { + if (data & 0x08) + samples->start(2,3,true); + else + samples->start(2,4,true); + } + } + + /* Game (tone generator enable) */ + if (FALLING_EDGE(0x80)) + { + tone_pointer = 0; + tone_active = 0; + + adjust_sample(samples, tone_freq); + } + + if (RISING_EDGE(0x80)) + tone_active=1; + + port_1_last = data; +} + + +WRITE8_HANDLER( targ_audio_2_w ) +{ + if ((data & 0x01) && !(port_2_last & 0x01)) + { + samples_device *samples = space->machine().device<samples_device>("samples"); + UINT8 *prom = space->machine().root_device().memregion("targ")->base(); + + tone_pointer = (tone_pointer + 1) & 0x0f; + + adjust_sample(samples, prom[((data & 0x02) << 3) | tone_pointer]); + } + + port_2_last = data; +} + + +WRITE8_HANDLER( spectar_audio_2_w ) +{ + samples_device *samples = space->machine().device<samples_device>("samples"); + adjust_sample(samples, data); +} + + +static const char *const sample_names[] = +{ + "*targ", + "expl", + "shot", + "sexpl", + "spslow", + "spfast", + 0 +}; + + +static void common_audio_start(running_machine &machine, int freq) +{ + samples_device *samples = machine.device<samples_device>("samples"); + max_freq = freq; + + tone_freq = 0; + tone_active = 0; + + samples->set_volume(3, 0); + samples->start_raw(3, sine_wave, 32, 1000, true); + + state_save_register_global(machine, port_1_last); + state_save_register_global(machine, port_2_last); + state_save_register_global(machine, tone_freq); + state_save_register_global(machine, tone_active); +} + + +static SAMPLES_START( spectar_audio_start ) +{ + common_audio_start(device.machine(), SPECTAR_MAXFREQ); +} + + +static SAMPLES_START( targ_audio_start ) +{ + running_machine &machine = device.machine(); + common_audio_start(machine, TARG_MAXFREQ); + + tone_pointer = 0; + + state_save_register_global(machine, tone_pointer); +} + + +static const samples_interface spectar_samples_interface = +{ + 4, /* number of channel */ + sample_names, + spectar_audio_start +}; + + +static const samples_interface targ_samples_interface = +{ + 4, /* number of channel */ + sample_names, + targ_audio_start +}; + + +MACHINE_CONFIG_FRAGMENT( spectar_audio ) + + MCFG_SPEAKER_STANDARD_MONO("mono") + + MCFG_SAMPLES_ADD("samples", spectar_samples_interface) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25) + + MCFG_SOUND_ADD("dac", DAC, 0) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0) +MACHINE_CONFIG_END + + +MACHINE_CONFIG_FRAGMENT( targ_audio ) + + MCFG_SPEAKER_STANDARD_MONO("mono") + + MCFG_SAMPLES_ADD("samples", targ_samples_interface) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25) + + MCFG_SOUND_ADD("dac", DAC, 0) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0) +MACHINE_CONFIG_END |