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/************************************************************************
* starshp1 Sound System Analog emulation
* Aug 2008, Derrick Renaud
************************************************************************/
#include "driver.h"
#include "starshp1.h"
#include "sound/discrete.h"
/* voltage out for each 1/256 step of MC1408 circuit */
#define MC1408_DAC(v_ref, r, rf) ((double)v_ref / (double)r * (double)rf / 256.0)
#define OP_AMP_NON_INVERT_GAIN(ri, rf) ((double)rf / (double)ri + 1)
/* Discrete Sound Input Nodes */
/* see "starshp1.h" */
/* Nodes - Sounds */
#define STARSHP1_PHASOR_SND NODE_13
#define STARSHP1_NOISE_SND NODE_14
#define STARSHP1_MOTOR_SND NODE_15
#define STARSHP1_SL1_SND NODE_16
#define STARSHP1_SL2_SND NODE_17
/* Timing signals */
#define STARSHP1_HSYNC 15750 /* per manual */
#define STARSHP1_S1V STARSHP1_HSYNC / 2
#define STARSHP1_S128V STARSHP1_S1V / 128
/* R/C values */
#define STARSHP1_R4 RES_K(1)
#define STARSHP1_R54 RES_K(47)
#define STARSHP1_R55 RES_K(22)
#define STARSHP1_R58 RES_K(1)
#define STARSHP1_R59 RES_K(1)
#define STARSHP1_R60 RES_K(6.8)
#define STARSHP1_R61 RES_K(10)
#define STARSHP1_R62 750
#define STARSHP1_R63 RES_K(22)
#define STARSHP1_R64 RES_K(10)
#define STARSHP1_R65 RES_K(3.3)
#define STARSHP1_R66 RES_K(33)
#define STARSHP1_R67 RES_K(1)
#define STARSHP1_R68 RES_K(3.3)
#define STARSHP1_R69 RES_K(330)
#define STARSHP1_R70 RES_K(10)
#define STARSHP1_R71 RES_K(6.8)
#define STARSHP1_R72 RES_K(47)
#define STARSHP1_R74 RES_K(100)
#define STARSHP1_R75 RES_K(47)
#define STARSHP1_R76 RES_K(5)
#define STARSHP1_R123 RES_K(1)
#define STARSHP1_R124 RES_K(1)
#define STARSHP1_R126 RES_K(1)
#define STARSHP1_R151 RES_K(10)
#define STARSHP1_R152 RES_K(1.5)
#define STARSHP1_C34 CAP_U(0.1)
#define STARSHP1_C36 CAP_U(2.2)
#define STARSHP1_C45 CAP_U(0.1)
#define STARSHP1_C46 CAP_U(0.1)
#define STARSHP1_C47 CAP_U(0.015)
#define STARSHP1_C59 CAP_U(0.22)
#define STARSHP1_C61 CAP_U(0.01)
#define STARSHP1_C63 CAP_U(0.1)
#define STARSHP1_C78 CAP_U(0.1)
/* Convert DAC value to voltage out at IC E10, pin 4 */
#define STARSHP1_MC1408_GAIN MC1408_DAC(5.0, STARSHP1_R4, STARSHP1_R62)
/* Gain at IC E10, pin 12 */
#define STARSHP1_TONE_PITCH_GAIN OP_AMP_NON_INVERT_GAIN(STARSHP1_R63, STARSHP1_R64)
#define STARSHP1_NOISE_AMPLITUDE_GAIN RES_VOLTAGE_DIVIDER(STARSHP1_R124, STARSHP1_R123)
/* tweak to apply compensation filter at pin 6 */
#define STARSHP1_FAKE_MC3340_COMPENSATION_R RES_K(6.2)
/* Discrete info structures */
static const discrete_lfsr_desc starshp1_lfsr={
DISC_CLK_IS_FREQ,
16, /* Bit Length */
0, /* Reset Value */
13, /* Use Bit 0 as XOR input 0 */
14, /* Use Bit 14 as XOR input 1 */
DISC_LFSR_XNOR, /* Feedback stage1 is XNOR */
DISC_LFSR_OR, /* Feedback stage2 is just stage 1 output OR with external feed */
DISC_LFSR_REPLACE, /* Feedback stage3 replaces the shifted register contents */
0x000001, /* Everything is shifted into the first bit only */
0, /* Output is not inverted */
15 /* Output bit */
};
static const discrete_555_desc starshp1_556_c10 =
{
DISC_555_OUT_ENERGY,
5, /* B+ voltage of 555 */
DEFAULT_555_VALUES
};
/* effect of 556 internal CV resistors at pin 3 */
static const discrete_mixer_desc starshp1_556_c10_cv =
{
DISC_MIXER_IS_RESISTOR,
{STARSHP1_R61, RES_K(5)},
{0}, {0}, 0, RES_K(10), 0, 0, 0, 1
};
static const discrete_mixer_desc starshp1_566_a9_mix_r =
{
DISC_MIXER_IS_RESISTOR,
{STARSHP1_R54, STARSHP1_R55},
{0}, {0}, 0, 0, 0, 0, 0, 1
};
static const discrete_mixer_desc starshp1_555_b10_mix_r =
{
DISC_MIXER_IS_RESISTOR,
{STARSHP1_R65, STARSHP1_R68},
{0}, {0}, 0, 0, 0, 0, 0, 1
};
static const discrete_555_desc starshp1_555_b10 =
{
DISC_555_OUT_ENERGY,
5, /* B+ voltage of 555 */
NODE_50, /* charge voltage */
DEFAULT_TTL_V_LOGIC_1 /* cheat and use and anti-alias IC A10 level */
};
static const discrete_mixer_desc starshp1_final_mix =
{
DISC_MIXER_IS_RESISTOR,
{STARSHP1_R66, STARSHP1_R126, STARSHP1_R59 + STARSHP1_R60, STARSHP1_R74, STARSHP1_R75},
{0}, /* no resistor nodes */
{0, STARSHP1_C78, STARSHP1_C36, 0, 0},
0,
STARSHP1_R76,
0, /* no cF */
STARSHP1_C63,
0, /* vRef */
1 /* gain */
};
DISCRETE_SOUND_START( starshp1 )
/************************************************
* Input register mapping
************************************************/
// DISCRETE_INPUTX_DATA(STARSHP1_NOISE_AMPLITUDE, STARSHP1_MC1408_GAIN * STARSHP1_NOISE_AMPLITUDE_GAIN, 0, 0)
/* Fake the MC1408, no where near correct */
DISCRETE_INPUTX_DATA(STARSHP1_NOISE_AMPLITUDE, -4.0/255, 4, 0)
DISCRETE_INPUTX_DATA(STARSHP1_TONE_PITCH, STARSHP1_MC1408_GAIN * STARSHP1_TONE_PITCH_GAIN, 0, 0)
DISCRETE_INPUTX_DATA(STARSHP1_MOTOR_SPEED, STARSHP1_MC1408_GAIN, 0, 0)
DISCRETE_INPUT_LOGIC(STARSHP1_NOISE_FREQ)
DISCRETE_INPUT_LOGIC(STARSHP1_SL2)
DISCRETE_INPUT_LOGIC(STARSHP1_SL1)
DISCRETE_INPUT_LOGIC(STARSHP1_KICKER)
DISCRETE_INPUT_LOGIC(STARSHP1_PHASOR_ON)
DISCRETE_INPUT_NOT (STARSHP1_ATTRACT) /* Inverted by Q9 */
/* when MOLVL is high, R58 is grounded, reducing the gain by 50% */
/* we will cheat and calculate that now */
#define STARSHP1_MOLVL_GAIN STARSHP1_MOLVL
#define STARSHP1_MOLVL_GAIN_VAL RES_VOLTAGE_DIVIDER(STARSHP1_R59, STARSHP1_R58)
DISCRETE_INPUTX_LOGIC(STARSHP1_MOLVL_GAIN, -STARSHP1_MOLVL_GAIN_VAL, STARSHP1_MOLVL_GAIN_VAL, 1)
/************************************************
* Noise
************************************************/
DISCRETE_LFSR_NOISE(NODE_20, /* IC B9, pin 13 */
1, /* ENAB */
STARSHP1_KICKER, /* IC B9 & C9, pin 9 */
STARSHP1_S1V, /* IC B9 & C9, pin 8 */
1, /* 1 p/p */
0, /* no feed */
1.0 / 2, /* shift to 0/1 */
&starshp1_lfsr)
/* calculate noise level */
DISCRETE_SWITCH( NODE_21, /* voltage at R151 & R152 junction */
NODE_20,
STARSHP1_NOISE_FREQ,
DEFAULT_TTL_V_LOGIC_1 * RES_VOLTAGE_DIVIDER(STARSHP1_R151, STARSHP1_R152),
DEFAULT_TTL_V_LOGIC_1)
/* fake MC3340 */
DISCRETE_MULTIPLY( NODE_22,
NODE_21,
STARSHP1_NOISE_AMPLITUDE)
DISCRETE_RCFILTER( NODE_23,
NODE_22,
STARSHP1_FAKE_MC3340_COMPENSATION_R,
STARSHP1_C61)
/* when NOISE_FREQ is high (NOISE_FREQ_INV is low), C59 is in circuit */
DISCRETE_RCFILTER( NODE_24,
NODE_22,
STARSHP1_FAKE_MC3340_COMPENSATION_R,
STARSHP1_C61 + STARSHP1_C59)
DISCRETE_SWITCH( STARSHP1_NOISE_SND,
1, /* ENAB */
STARSHP1_NOISE_FREQ,
NODE_23,
NODE_24)
/************************************************
* Phasor
************************************************/
DISCRETE_555_ASTABLE(NODE_30, /* IC C10, pin 9 */
STARSHP1_PHASOR_ON, /* RESET */
STARSHP1_R70,
STARSHP1_R69,
STARSHP1_C46,
&starshp1_556_c10)
/* compensate for internal 555 CV resistors */
DISCRETE_MIXER2( NODE_31,
1, /* ENAB */
NODE_30, /* IC C10, pin 9 */
5, /* 555 B+ */
&starshp1_556_c10_cv)
DISCRETE_555_ASTABLE_CV(STARSHP1_PHASOR_SND, /* IC C10, pin 5 */
STARSHP1_PHASOR_ON, /* RESET */
STARSHP1_R68,
STARSHP1_R67,
STARSHP1_C45,
NODE_31, /* IC C10, pin 3 */
&starshp1_556_c10)
/************************************************
* Motor
************************************************/
DISCRETE_SQUAREWFIX(NODE_40, /* S128V signal */
1, /* ENAB */
STARSHP1_S128V,
DEFAULT_TTL_V_LOGIC_1,
50, /* DUTY */
DEFAULT_TTL_V_LOGIC_1 / 2, /* BIAS */
0) /* PHASE */
DISCRETE_MIXER2( NODE_41, /* voltage at R54 & R55 junction */
1, /* ENAB */
NODE_40, /* IC E10, pin 12 */
5, /* 5V to R55 */
&starshp1_566_a9_mix_r)
DISCRETE_566( NODE_42, /* IC A9, pin 4 */
STARSHP1_MOTOR_SPEED, /* IC A9, pin 5 */
RES_2_PARALLEL(STARSHP1_R54, STARSHP1_R55),
STARSHP1_C34,
5, -10, NODE_41, /* VPOS,VNEG,VCHARGE */
DISC_566_OUT_TRIANGLE)
DISCRETE_MULTIPLY( STARSHP1_MOTOR_SND,
NODE_42,
STARSHP1_MOLVL_GAIN)
/************************************************
* SL1, SL2
************************************************/
DISCRETE_MIXER2( NODE_50, /* voltage at R65 & R71 junction */
1, /* ENAB */
STARSHP1_TONE_PITCH, /* IC E10, pin 12 */
10, /* 10V to R71 */
&starshp1_555_b10_mix_r)
DISCRETE_555_ASTABLE(NODE_51, /* IC B10, pin 3 */
1, /* RESET */
RES_2_PARALLEL(STARSHP1_R65, STARSHP1_R71),
STARSHP1_R72,
STARSHP1_C47,
&starshp1_555_b10)
/* use switch instead of logic AND, so we can switch between
* 0V and the anti-aliased TTL level out that we set NODE_51 to. */
DISCRETE_SWITCH( STARSHP1_SL1_SND, /* IC A10, pin 11 */
1, /* ENAB */
STARSHP1_SL1,
0,
NODE_51)
DISCRETE_SWITCH( STARSHP1_SL2_SND, /* IC A10, pin 8 */
1, /* ENAB */
STARSHP1_SL2,
0,
NODE_51)
/************************************************
* Mixing and output
************************************************/
DISCRETE_MIXER5( NODE_90,
STARSHP1_ATTRACT, /* ENAB */
STARSHP1_PHASOR_SND,
STARSHP1_NOISE_SND,
STARSHP1_MOTOR_SND,
STARSHP1_SL1_SND,
STARSHP1_SL2_SND,
&starshp1_final_mix)
/* set a gain that clips the noise some, just like the real board */
DISCRETE_OUTPUT(NODE_90, 110000)
DISCRETE_SOUND_END
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