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diff --git a/src/mame/audio/starshp1.cpp b/src/mame/audio/starshp1.cpp
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+// license:???
+// copyright-holders:Derrick Renaud
+/************************************************************************
+ * starshp1 Sound System Analog emulation
+ * Aug 2008, Derrick Renaud
+ ************************************************************************/
+
+#include "emu.h"
+#include "includes/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, 0, 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_MOLVL)
+ DISCRETE_INPUT_NOT (STARSHP1_ATTRACT) /* Inverted by Q9 */
+
+ /************************************************
+ * 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_DC | DISC_566_OUT_TRIANGLE)
+ DISCRETE_SWITCH(NODE_43,
+ 1, /* ENAB */
+ STARSHP1_MOLVL, /* SWITCH */
+ STARSHP1_R59 + RES_2_PARALLEL(STARSHP1_R58, STARSHP1_R60 + STARSHP1_R76),
+ STARSHP1_R59 + STARSHP1_R60 + STARSHP1_R76)
+ DISCRETE_CRFILTER(NODE_44,
+ NODE_42, /* IN0 */
+ NODE_43, /* RVAL*/
+ STARSHP1_C36)
+ DISCRETE_SWITCH(NODE_45, /* gain affect of voltage divider */
+ 1, /* ENAB */
+ STARSHP1_MOLVL, /* SWITCH */
+ RES_VOLTAGE_DIVIDER(STARSHP1_R59, STARSHP1_R58), 1)
+ DISCRETE_MULTIPLY( STARSHP1_MOTOR_SND,
+ NODE_44,
+ NODE_45)
+
+ /************************************************
+ * 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_ONOFF( STARSHP1_SL1_SND, /* IC A10, pin 11 */
+ STARSHP1_SL1, NODE_51)
+ DISCRETE_ONOFF( STARSHP1_SL2_SND, /* IC A10, pin 8 */
+ STARSHP1_SL2, 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