diff options
Diffstat (limited to 'src/mame/audio/n8080.c')
-rw-r--r-- | src/mame/audio/n8080.c | 605 |
1 files changed, 605 insertions, 0 deletions
diff --git a/src/mame/audio/n8080.c b/src/mame/audio/n8080.c new file mode 100644 index 00000000000..b6a820904bc --- /dev/null +++ b/src/mame/audio/n8080.c @@ -0,0 +1,605 @@ +/*************************************************************************** + + Nintendo 8080 sound emulation + +***************************************************************************/ + +#include "driver.h" +#include "cpu/i8039/i8039.h" +#include "sound/sn76477.h" +#include "sound/dac.h" +#include "includes/n8080.h" +#include <math.h> + +static int n8080_hardware; + +static emu_timer* sound_timer[3]; + +static int helifire_dac_phase; + +static const double ATTACK_RATE = 10e-6 * 500; +static const double DECAY_RATE = 10e-6 * 16000; + +static double helifire_dac_volume; +static double helifire_dac_timing; + +static UINT16 prev_sound_pins; +static UINT16 curr_sound_pins; + +static int mono_flop[3]; + + + +struct SN76477interface sheriff_sn76477_interface = +{ + RES_K(36) , /* 04 */ + RES_K(100) , /* 05 */ + CAP_N(1) , /* 06 */ + RES_K(620) , /* 07 */ + CAP_U(1) , /* 08 */ + RES_K(20) , /* 10 */ + RES_K(150) , /* 11 */ + RES_K(47) , /* 12 */ + 0 , /* 16 */ + CAP_N(1) , /* 17 */ + RES_M(1.5) , /* 18 */ + 0 , /* 19 */ + RES_M(1.5) , /* 20 */ + CAP_N(47) , /* 21 */ + CAP_N(47) , /* 23 */ + RES_K(560) , /* 24 */ + 0, /* 22 vco */ + 0, /* 26 mixer A */ + 0, /* 25 mixer B */ + 0, /* 27 mixer C */ + 1, /* 1 envelope 1 */ + 0, /* 28 envelope 2 */ + 1 /* 9 enable */ +}; + + +struct SN76477interface spacefev_sn76477_interface = +{ + RES_K(36) , /* 04 */ + RES_K(150) , /* 05 */ + CAP_N(1) , /* 06 */ + RES_M(1) , /* 07 */ + CAP_U(1) , /* 08 */ + RES_K(20) , /* 10 */ + RES_K(150) , /* 11 */ + RES_K(47) , /* 12 */ + 0 , /* 16 */ + CAP_N(1) , /* 17 */ + RES_M(1.5) , /* 18 */ + 0 , /* 19 */ + RES_M(1) , /* 20 */ + CAP_N(47) , /* 21 */ + CAP_N(47) , /* 23 */ + RES_K(820) , /* 24 */ + 0, /* 22 vco */ + 0, /* 26 mixer A */ + 0, /* 25 mixer B */ + 0, /* 27 mixer C */ + 1, /* 1 envelope 1 */ + 0, /* 28 envelope 2 */ + 1 /* 9 enable */ +}; + + +static void spacefev_update_SN76477_status(void) +{ + double dblR0 = RES_M(1.0); + double dblR1 = RES_M(1.5); + + if (!mono_flop[0]) + { + dblR0 = 1 / (1 / RES_K(150) + 1 / dblR0); /* ? */ + } + if (!mono_flop[1]) + { + dblR1 = 1 / (1 / RES_K(620) + 1 / dblR1); /* ? */ + } + + SN76477_decay_res_w(0, dblR0); + + SN76477_vco_res_w(0, dblR1); + + SN76477_enable_w(0, + !mono_flop[0] && + !mono_flop[1] && + !mono_flop[2]); + + SN76477_vco_w(0, mono_flop[1]); + + SN76477_mixer_b_w(0, mono_flop[0]); +} + + +static void sheriff_update_SN76477_status(void) +{ + if (mono_flop[1]) + { + SN76477_vco_voltage_w(0, 5); + } + else + { + SN76477_vco_voltage_w(0, 0); + } + + SN76477_enable_w(0, + !mono_flop[0] && + !mono_flop[1]); + + SN76477_vco_w(0, mono_flop[0]); + + SN76477_mixer_b_w(0, !mono_flop[0]); +} + + +static void update_SN76477_status(void) +{ + if (n8080_hardware == 1) + { + spacefev_update_SN76477_status(); + } + if (n8080_hardware == 2) + { + sheriff_update_SN76477_status(); + } +} + + +static void start_mono_flop(int n, attotime expire) +{ + mono_flop[n] = 1; + + update_SN76477_status(); + + timer_adjust(sound_timer[n], expire, n, attotime_zero); +} + + +static void stop_mono_flop(int n) +{ + mono_flop[n] = 0; + + update_SN76477_status(); + + timer_adjust(sound_timer[n], attotime_never, n, attotime_never); +} + + +static TIMER_CALLBACK( stop_mono_flop_callback ) +{ + stop_mono_flop(param); +} + + +static void spacefev_sound_pins_changed(void) +{ + UINT16 changes = ~curr_sound_pins & prev_sound_pins; + + if (changes & (1 << 0x3)) + { + stop_mono_flop(1); + } + if (changes & ((1 << 0x3) | (1 << 0x6))) + { + stop_mono_flop(2); + } + if (changes & (1 << 0x3)) + { + start_mono_flop(0, ATTOTIME_IN_USEC(550 * 36 * 100)); + } + if (changes & (1 << 0x6)) + { + start_mono_flop(1, ATTOTIME_IN_USEC(550 * 22 * 33)); + } + if (changes & (1 << 0x4)) + { + start_mono_flop(2, ATTOTIME_IN_USEC(550 * 22 * 33)); + } + if (changes & ((1 << 0x2) | (1 << 0x3) | (1 << 0x5))) + { + cpunum_set_input_line(1, 0, PULSE_LINE); + } +} + + +static void sheriff_sound_pins_changed(void) +{ + UINT16 changes = ~curr_sound_pins & prev_sound_pins; + + if (changes & (1 << 0x6)) + { + stop_mono_flop(1); + } + if (changes & (1 << 0x6)) + { + start_mono_flop(0, ATTOTIME_IN_USEC(550 * 33 * 33)); + } + if (changes & (1 << 0x4)) + { + start_mono_flop(1, ATTOTIME_IN_USEC(550 * 33 * 33)); + } + if (changes & ((1 << 0x2) | (1 << 0x3) | (1 << 0x5))) + { + cpunum_set_input_line(1, 0, PULSE_LINE); + } +} + + +static void helifire_sound_pins_changed(void) +{ + UINT16 changes = ~curr_sound_pins & prev_sound_pins; + + /* ((curr_sound_pins >> 0xA) & 1) not emulated */ + /* ((curr_sound_pins >> 0xB) & 1) not emulated */ + /* ((curr_sound_pins >> 0xC) & 1) not emulated */ + + if (changes & (1 << 6)) + { + cpunum_set_input_line(1, 0, PULSE_LINE); + } +} + + +static void sound_pins_changed(void) +{ + if (n8080_hardware == 1) + { + spacefev_sound_pins_changed(); + } + if (n8080_hardware == 2) + { + sheriff_sound_pins_changed(); + } + if (n8080_hardware == 3) + { + helifire_sound_pins_changed(); + } + + prev_sound_pins = curr_sound_pins; +} + + +static void delayed_sound_1(int data) +{ + static UINT8 prev_data = 0; + + curr_sound_pins &= ~( + (1 << 0x7) | + (1 << 0x5) | + (1 << 0x6) | + (1 << 0x3) | + (1 << 0x4) | + (1 << 0x1)); + + if (~data & 0x01) curr_sound_pins |= 1 << 0x7; + if (~data & 0x02) curr_sound_pins |= 1 << 0x5; /* pulse */ + if (~data & 0x04) curr_sound_pins |= 1 << 0x6; /* pulse */ + if (~data & 0x08) curr_sound_pins |= 1 << 0x3; /* pulse (except in Helifire) */ + if (~data & 0x10) curr_sound_pins |= 1 << 0x4; /* pulse (except in Helifire) */ + if (~data & 0x20) curr_sound_pins |= 1 << 0x1; + + if (n8080_hardware == 1) + { + if (data & ~prev_data & 0x10) + { + spacefev_start_red_cannon(); + } + + spacefev_red_screen = data & 0x08; + } + + sound_pins_changed(); + + prev_data = data; +} + + +static TIMER_CALLBACK( delayed_sound_1_callback ) +{ + delayed_sound_1(param); +} + + +static void delayed_sound_2(int data) +{ + curr_sound_pins &= ~( + (1 << 0x8) | + (1 << 0x9) | + (1 << 0xA) | + (1 << 0xB) | + (1 << 0x2) | + (1 << 0xC)); + + if (~data & 0x01) curr_sound_pins |= 1 << 0x8; + if (~data & 0x02) curr_sound_pins |= 1 << 0x9; + if (~data & 0x04) curr_sound_pins |= 1 << 0xA; + if (~data & 0x08) curr_sound_pins |= 1 << 0xB; + if (~data & 0x10) curr_sound_pins |= 1 << 0x2; /* pulse */ + if (~data & 0x20) curr_sound_pins |= 1 << 0xC; + + if (n8080_hardware == 1) + { + flip_screen = data & 0x20; + } + if (n8080_hardware == 3) + { + helifire_flash = data & 0x20; + } + + sound_pins_changed(); +} + + +static TIMER_CALLBACK( delayed_sound_2_callback ) +{ + delayed_sound_2(param); +} + + +WRITE8_HANDLER( n8080_sound_1_w ) +{ + timer_call_after_resynch(data, delayed_sound_1_callback); /* force CPUs to sync */ +} +WRITE8_HANDLER( n8080_sound_2_w ) +{ + timer_call_after_resynch(data, delayed_sound_2_callback); /* force CPUs to sync */ +} + + +static READ8_HANDLER( n8080_8035_p1_r ) +{ + UINT8 val = 0; + + if ((curr_sound_pins >> 0xB) & 1) val |= 0x01; + if ((curr_sound_pins >> 0xA) & 1) val |= 0x02; + if ((curr_sound_pins >> 0x9) & 1) val |= 0x04; + if ((curr_sound_pins >> 0x8) & 1) val |= 0x08; + if ((curr_sound_pins >> 0x5) & 1) val |= 0x10; + if ((curr_sound_pins >> 0x3) & 1) val |= 0x20; + if ((curr_sound_pins >> 0x2) & 1) val |= 0x40; + if ((curr_sound_pins >> 0x1) & 1) val |= 0x80; + + return val; +} + + +static READ8_HANDLER( n8080_8035_t0_r ) +{ + return (curr_sound_pins >> 0x7) & 1; +} +static READ8_HANDLER( n8080_8035_t1_r ) +{ + return (curr_sound_pins >> 0xC) & 1; +} + + +static READ8_HANDLER( helifire_8035_t0_r ) +{ + return (curr_sound_pins >> 0x3) & 1; +} +static READ8_HANDLER( helifire_8035_t1_r ) +{ + return (curr_sound_pins >> 0x4) & 1; +} + + +static READ8_HANDLER( helifire_8035_external_ram_r ) +{ + UINT8 val = 0; + + if ((curr_sound_pins >> 0x7) & 1) val |= 0x01; + if ((curr_sound_pins >> 0x8) & 1) val |= 0x02; + if ((curr_sound_pins >> 0x9) & 1) val |= 0x04; + if ((curr_sound_pins >> 0x1) & 1) val |= 0x08; + + return val; +} + + +static READ8_HANDLER( helifire_8035_p2_r ) +{ + return ((curr_sound_pins >> 0xC) & 1) ? 0x10 : 0x00; /* not used */ +} + + +static WRITE8_HANDLER( n8080_dac_w ) +{ + DAC_data_w(0, data & 0x80); +} + + +static WRITE8_HANDLER( helifire_dac_w ) +{ + DAC_data_w(0, data * helifire_dac_volume); +} + + +static WRITE8_HANDLER( helifire_sound_ctrl_w ) +{ + helifire_dac_phase = data & 0x80; + + /* data & 0x40 not emulated */ + /* data & 0x20 not emulated */ + + if (helifire_dac_phase) + { + helifire_dac_timing = ATTACK_RATE * log(1 - helifire_dac_volume); + } + else + { + helifire_dac_timing = DECAY_RATE * log(helifire_dac_volume); + } + + helifire_dac_timing += attotime_to_double(timer_get_time()); +} + + +static TIMER_CALLBACK( spacefev_vco_voltage_timer ) +{ + double voltage = 0; + + if (mono_flop[2]) + { + voltage = 5 * (1 - exp(- attotime_to_double(timer_timeelapsed(sound_timer[2])) / 0.22)); + } + + SN76477_vco_voltage_w(0, voltage); +} + + +static TIMER_CALLBACK( helifire_dac_volume_timer ) +{ + double t = helifire_dac_timing - attotime_to_double(timer_get_time()); + + if (helifire_dac_phase) + { + helifire_dac_volume = 1 - exp(t / ATTACK_RATE); + } + else + { + helifire_dac_volume = exp(t / DECAY_RATE); + } +} + + +static MACHINE_RESET( spacefev_sound ) +{ + n8080_hardware = 1; + + timer_pulse(ATTOTIME_IN_HZ(1000), 0, spacefev_vco_voltage_timer); + + sound_timer[0] = timer_alloc(stop_mono_flop_callback); + sound_timer[1] = timer_alloc(stop_mono_flop_callback); + sound_timer[2] = timer_alloc(stop_mono_flop_callback); + + mono_flop[0] = 0; + mono_flop[1] = 0; + mono_flop[2] = 0; + + delayed_sound_1(0); + delayed_sound_2(0); +} + + +static MACHINE_RESET( sheriff_sound ) +{ + n8080_hardware = 2; + + sound_timer[0] = timer_alloc(stop_mono_flop_callback); + sound_timer[1] = timer_alloc(stop_mono_flop_callback); + + mono_flop[0] = 0; + mono_flop[1] = 0; + + delayed_sound_1(0); + delayed_sound_2(0); +} + + +static MACHINE_RESET( helifire_sound ) +{ + n8080_hardware = 3; + + timer_pulse(ATTOTIME_IN_HZ(1000), 0, helifire_dac_volume_timer); + + helifire_dac_volume = 1; + helifire_dac_timing = 0; + + delayed_sound_1(0); + delayed_sound_2(0); + + helifire_dac_phase = 0; +} + + +static ADDRESS_MAP_START( n8080_sound_cpu_map, ADDRESS_SPACE_PROGRAM, 8 ) + ADDRESS_MAP_FLAGS( AMEF_ABITS(10) ) + AM_RANGE(0x0000, 0x03ff) AM_ROM +ADDRESS_MAP_END + + +static ADDRESS_MAP_START( n8080_sound_io_map, ADDRESS_SPACE_IO, 8 ) + AM_RANGE(I8039_t0, I8039_t0) AM_READ(n8080_8035_t0_r) + AM_RANGE(I8039_t1, I8039_t1) AM_READ(n8080_8035_t1_r) + AM_RANGE(I8039_p1, I8039_p1) AM_READ(n8080_8035_p1_r) + + AM_RANGE(I8039_p2, I8039_p2) AM_WRITE(n8080_dac_w) +ADDRESS_MAP_END + + +static ADDRESS_MAP_START( helifire_sound_io_map, ADDRESS_SPACE_IO, 8 ) + AM_RANGE(I8039_t0, I8039_t0) AM_READ(helifire_8035_t0_r) + AM_RANGE(I8039_t1, I8039_t1) AM_READ(helifire_8035_t1_r) + AM_RANGE(I8039_p2, I8039_p2) AM_READ(helifire_8035_p2_r) + + AM_RANGE(0x00, 0x7f) AM_READ(helifire_8035_external_ram_r) + + AM_RANGE(I8039_p1, I8039_p1) AM_WRITE(helifire_dac_w) + AM_RANGE(I8039_p2, I8039_p2) AM_WRITE(helifire_sound_ctrl_w) +ADDRESS_MAP_END + + +MACHINE_DRIVER_START( spacefev_sound ) + + /* basic machine hardware */ + MDRV_CPU_ADD(I8035, 6000000 / I8039_CLOCK_DIVIDER) + /* audio CPU */ + MDRV_CPU_PROGRAM_MAP(n8080_sound_cpu_map, 0) + MDRV_CPU_IO_MAP(n8080_sound_io_map, 0) + + MDRV_MACHINE_RESET(spacefev_sound) + + /* sound hardware */ + MDRV_SPEAKER_STANDARD_MONO("mono") + + MDRV_SOUND_ADD(DAC, 0) + MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.30) + + MDRV_SOUND_ADD(SN76477, 0) + MDRV_SOUND_CONFIG(spacefev_sn76477_interface) + MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.35) +MACHINE_DRIVER_END + + +MACHINE_DRIVER_START( sheriff_sound ) + + /* basic machine hardware */ + MDRV_CPU_ADD(I8035, 6000000 / I8039_CLOCK_DIVIDER) + /* audio CPU */ + MDRV_CPU_PROGRAM_MAP(n8080_sound_cpu_map, 0) + MDRV_CPU_IO_MAP(n8080_sound_io_map, 0) + + MDRV_MACHINE_RESET(sheriff_sound) + + /* sound hardware */ + MDRV_SPEAKER_STANDARD_MONO("mono") + + MDRV_SOUND_ADD(DAC, 0) + MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.30) + + MDRV_SOUND_ADD(SN76477, 0) + MDRV_SOUND_CONFIG(sheriff_sn76477_interface) + MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.35) +MACHINE_DRIVER_END + + +MACHINE_DRIVER_START( helifire_sound ) + + /* basic machine hardware */ + MDRV_CPU_ADD(I8035, 6000000 / I8039_CLOCK_DIVIDER) + /* audio CPU */ + MDRV_CPU_PROGRAM_MAP(n8080_sound_cpu_map, 0) + MDRV_CPU_IO_MAP(helifire_sound_io_map, 0) + + MDRV_MACHINE_RESET(helifire_sound) + + /* sound hardware */ + MDRV_SPEAKER_STANDARD_MONO("mono") + + MDRV_SOUND_ADD(DAC, 0) + MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.30) +MACHINE_DRIVER_END |