diff options
Diffstat (limited to 'src/mame/audio/llander.c')
-rw-r--r-- | src/mame/audio/llander.c | 63 |
1 files changed, 31 insertions, 32 deletions
diff --git a/src/mame/audio/llander.c b/src/mame/audio/llander.c index a4c2b119bef..d3277876410 100644 --- a/src/mame/audio/llander.c +++ b/src/mame/audio/llander.c @@ -12,30 +12,30 @@ /* Lunar Lander Sound System Analog emulation by K.Wilkins Nov 2000 */ /* Questions/Suggestions to mame@dysfunction.demon.co.uk */ /************************************************************************/ -#define LLANDER_TONE3K_EN NODE_01 -#define LLANDER_TONE6K_EN NODE_02 -#define LLANDER_THRUST_DATA NODE_03 -#define LLANDER_EXPLOD_EN NODE_04 -#define LLANDER_NOISE_RESET NODE_05 +#define LLANDER_TONE3K_EN NODE_01 +#define LLANDER_TONE6K_EN NODE_02 +#define LLANDER_THRUST_DATA NODE_03 +#define LLANDER_EXPLOD_EN NODE_04 +#define LLANDER_NOISE_RESET NODE_05 -#define LLANDER_NOISE NODE_10 -#define LLANDER_TONE_3K_SND NODE_11 -#define LLANDER_TONE_6K_SND NODE_12 -#define LLANDER_THRUST_EXPLOD_SND NODE_13 +#define LLANDER_NOISE NODE_10 +#define LLANDER_TONE_3K_SND NODE_11 +#define LLANDER_TONE_6K_SND NODE_12 +#define LLANDER_THRUST_EXPLOD_SND NODE_13 static const discrete_lfsr_desc llander_lfsr = { DISC_CLK_IS_FREQ, - 16, /* Bit Length */ - 0, /* Reset Value */ - 6, /* Use Bit 6 as XOR input 0 */ - 14, /* Use Bit 14 as XOR input 1 */ - DISC_LFSR_XNOR, /* Feedback stage1 is inverted XOR */ - DISC_LFSR_IN0, /* Feedback stage2 is just stage 1 output external feed not used */ - DISC_LFSR_REPLACE, /* Feedback stage3 replaces the shifted register contents */ - 0x000001, /* Everything is shifted into the first bit only */ - 0, /* Output not inverted */ - 14 /* Output bit */ + 16, /* Bit Length */ + 0, /* Reset Value */ + 6, /* Use Bit 6 as XOR input 0 */ + 14, /* Use Bit 14 as XOR input 1 */ + DISC_LFSR_XNOR, /* Feedback stage1 is inverted XOR */ + DISC_LFSR_IN0, /* Feedback stage2 is just stage 1 output external feed not used */ + DISC_LFSR_REPLACE, /* Feedback stage3 replaces the shifted register contents */ + 0x000001, /* Everything is shifted into the first bit only */ + 0, /* Output not inverted */ + 14 /* Output bit */ }; DISCRETE_SOUND_START(llander) @@ -58,39 +58,38 @@ DISCRETE_SOUND_START(llander) DISCRETE_INPUT_LOGIC(LLANDER_EXPLOD_EN) DISCRETE_INPUT_PULSE(LLANDER_NOISE_RESET, 1) - DISCRETE_LFSR_NOISE(NODE_20, 1, LLANDER_NOISE_RESET, 12000, 1, 0, 0, &llander_lfsr) // 12KHz Noise source for thrust + DISCRETE_LFSR_NOISE(NODE_20, 1, LLANDER_NOISE_RESET, 12000, 1, 0, 0, &llander_lfsr) // 12KHz Noise source for thrust DISCRETE_RCFILTER(LLANDER_NOISE, NODE_20, 2247, 1e-6) - DISCRETE_SQUAREWFIX(LLANDER_TONE_3K_SND, LLANDER_TONE3K_EN, 3000, 9.2, 50, 0, 0) // 3KHz + DISCRETE_SQUAREWFIX(LLANDER_TONE_3K_SND, LLANDER_TONE3K_EN, 3000, 9.2, 50, 0, 0) // 3KHz - DISCRETE_SQUAREWFIX(LLANDER_TONE_6K_SND, LLANDER_TONE6K_EN, 6000, 9.2, 50, 0, 0) // 6KHz + DISCRETE_SQUAREWFIX(LLANDER_TONE_6K_SND, LLANDER_TONE6K_EN, 6000, 9.2, 50, 0, 0) // 6KHz - DISCRETE_MULTIPLY(NODE_30, LLANDER_NOISE, LLANDER_THRUST_DATA) // Mix in 12KHz Noise source for thrust + DISCRETE_MULTIPLY(NODE_30, LLANDER_NOISE, LLANDER_THRUST_DATA) // Mix in 12KHz Noise source for thrust /* TBD - replace this line with a Sallen-Key Bandpass macro */ DISCRETE_FILTER2(NODE_31, 1, NODE_30, 89.5, (1.0 / 7.6), DISC_FILTER_BANDPASS) - DISCRETE_MULTIPLY(NODE_32, NODE_30, 1000.0/600.0) // Explode adds original noise source onto filtered source + DISCRETE_MULTIPLY(NODE_32, NODE_30, 1000.0/600.0) // Explode adds original noise source onto filtered source DISCRETE_ONOFF(NODE_33, LLANDER_EXPLOD_EN, NODE_32) DISCRETE_ADDER2(NODE_34, 1, NODE_31, NODE_33) /* TBD - replace this line with a Active Lowpass macro */ DISCRETE_FILTER1(LLANDER_THRUST_EXPLOD_SND, 1, NODE_34, 560, DISC_FILTER_LOWPASS) - DISCRETE_ADDER3(NODE_90, 1, LLANDER_TONE_3K_SND, LLANDER_TONE_6K_SND, LLANDER_THRUST_EXPLOD_SND) // Mix all four sound sources + DISCRETE_ADDER3(NODE_90, 1, LLANDER_TONE_3K_SND, LLANDER_TONE_6K_SND, LLANDER_THRUST_EXPLOD_SND) // Mix all four sound sources DISCRETE_GAIN(NODE_91, NODE_90, 65534.0/(9.2+9.2+600+1000)) - DISCRETE_OUTPUT(NODE_90, 65534.0/(9.2+9.2+600+1000)) // Take the output from the mixer + DISCRETE_OUTPUT(NODE_90, 65534.0/(9.2+9.2+600+1000)) // Take the output from the mixer DISCRETE_SOUND_END WRITE8_MEMBER(asteroid_state::llander_snd_reset_w) { /* Resets the LFSR that is used for the white noise generator */ - discrete_sound_w(m_discrete, space, LLANDER_NOISE_RESET, 0); /* Reset */ + discrete_sound_w(m_discrete, space, LLANDER_NOISE_RESET, 0); /* Reset */ } WRITE8_MEMBER(asteroid_state::llander_sounds_w) { - discrete_sound_w(m_discrete, space, LLANDER_THRUST_DATA, data & 0x07); /* Thrust volume */ - discrete_sound_w(m_discrete, space, LLANDER_TONE3K_EN, data & 0x10); /* Tone 3KHz enable */ - discrete_sound_w(m_discrete, space, LLANDER_TONE6K_EN, data & 0x20); /* Tone 6KHz enable */ - discrete_sound_w(m_discrete, space, LLANDER_EXPLOD_EN, data & 0x08); /* Explosion */ + discrete_sound_w(m_discrete, space, LLANDER_THRUST_DATA, data & 0x07); /* Thrust volume */ + discrete_sound_w(m_discrete, space, LLANDER_TONE3K_EN, data & 0x10); /* Tone 3KHz enable */ + discrete_sound_w(m_discrete, space, LLANDER_TONE6K_EN, data & 0x20); /* Tone 6KHz enable */ + discrete_sound_w(m_discrete, space, LLANDER_EXPLOD_EN, data & 0x08); /* Explosion */ } - |