// license:BSD-3-Clause // copyright-holders:Derrick Renaud /************************************************************************ * skyraid Sound System Analog emulation * Sept 2009, Derrick Renaud ************************************************************************/ #include "emu.h" #include "includes/skyraid.h" /* Discrete Sound Input Nodes */ #define SKYRAID_PLANE_SWEEP_EN NODE_01 #define SKYRAID_MISSILE_EN NODE_02 #define SKYRAID_EXPLOSION_EN NODE_03 #define SKYRAID_PLANE_ON_EN NODE_04 #define SKYRAID_PLANE_ON__IC_E8 SKYRAID_PLANE_ON_EN #define SKYRAID_ATTRACT_EN NODE_05 /* Discrete Sound Output Nodes */ #define SKYRAID_NOISE NODE_10 #define SKYRAID_EXPLOSION_SND NODE_11 #define SKYRAID_JET_A_SND NODE_12 #define SKYRAID_JET_B_SND NODE_13 #define SKYRAID_MSL_A_SND NODE_14 #define SKYRAID_MSL_B_SND NODE_15 #define SKYRAID_PLANE_SND NODE_16 /* Parts List - Resistors */ #define SKYRAID_R12 RES_K(1) #define SKYRAID_R13 RES_K(10) #define SKYRAID_R14 RES_K(100) #define SKYRAID_R16 RES_K(10) #define SKYRAID_R18 RES_K(10) #define SKYRAID_R19 RES_K(10) #define SKYRAID_R20 RES_K(47) #define SKYRAID_R24 RES_M(10) #define SKYRAID_R25 RES_M(3.9) #define SKYRAID_R27 RES_M(1.5) #define SKYRAID_R28 RES_M(1.5) #define SKYRAID_R29 RES_M(4.7) #define SKYRAID_R30 RES_M(1) #define SKYRAID_R31 RES_M(1) #define SKYRAID_R32 RES_M(4.7) #define SKYRAID_R84 RES_K(22) #define SKYRAID_R85 RES_K(100) #define SKYRAID_R86 820 #define SKYRAID_R110 RES_K(330) #define SKYRAID_R118 RES_K(470) #define SKYRAID_R119 RES_K(10) #define SKYRAID_R120 RES_K(220) #define SKYRAID_R121 RES_K(1) #define SKYRAID_R122 RES_K(150) /* Parts List - Capacitors */ #define SKYRAID_C44 CAP_U(4.7) #define SKYRAID_C45 CAP_U(.0047) #define SKYRAID_C46 CAP_U(.001) #define SKYRAID_C48 CAP_U(.0047) #define SKYRAID_C49 CAP_U(.1) #define SKYRAID_C50 CAP_U(.001) #define SKYRAID_C51 CAP_U(.01) #define SKYRAID_C68 CAP_U(10) #define SKYRAID_C85 CAP_U(.068) #define SKYRAID_C86 CAP_U(.1) #define SKYRAID_C93 CAP_U(.1) static const discrete_lfsr_desc skyraid_lfsr = { DISC_CLK_IS_FREQ, 16, /* Bit Length */ 0, /* Reset Value */ 0, /* 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 */ DISC_LFSR_FLAG_RESET_TYPE_H, /* Output is not inverted */ 15 /* Output bit */ }; static const discrete_op_amp_filt_info skyraid_explosion_filter = { SKYRAID_R85, 0, SKYRAID_R86, 0, SKYRAID_R110, /* r1, r2, r3, r4, rF*/ SKYRAID_C85, SKYRAID_C86, 0, /* c1, c2, c3 */ 0, 12, -5, /* vRef, vP, vN */ }; static const discrete_dac_r1_ladder skyraid_plane_dac = { 2, {SKYRAID_R28, SKYRAID_R27}, 0, 0, 0, 0 /* no vBias, rBias, rGnd, cFilter */ }; static const discrete_mixer_desc skyraid_mixer = { DISC_MIXER_IS_RESISTOR, {SKYRAID_R120, SKYRAID_R32, SKYRAID_R29, SKYRAID_R30, SKYRAID_R31, RES_2_PARALLEL(SKYRAID_R28, SKYRAID_R27)}, {0, 0, 0, 0, 0, SKYRAID_PLANE_ON__IC_E8}, /* r_nodes */ {0}, 0, 0, 0, 0, 0, 1 /* no c, rI, rF, cF, cAmp, vRef, gain */ }; /************************************************************************ * * Custom skyraid missle charge * * input[0] - In1 (Logic) * input[1] - R1 * input[2] - R2 * input[3] - R3 * input[4] - C * * 12V 5V * v v * | | * Z --- * Z R1 ^ 1N914 * Z / \ Diode * | ----- * | | * +--------------+ * | | * --- Z * --- C Z R2 * | Z * | | * +--------------+----> Node Output * | * Z * Z R3 * O.C. Z * |\ | * In1 >--| o--+ * |/ * ************************************************************************/ #define SKYRAID_MISSLE_CUSTOM_IN1 DISCRETE_INPUT(0) #define SKYRAID_MISSLE_CUSTOM_R1 DISCRETE_INPUT(1) #define SKYRAID_MISSLE_CUSTOM_R2 DISCRETE_INPUT(2) #define SKYRAID_MISSLE_CUSTOM_R3 DISCRETE_INPUT(3) #define SKYRAID_MISSLE_CUSTOM_C DISCRETE_INPUT(4) DISCRETE_CLASS_STEP_RESET(skyraid_missle_custom_charge, 2, double m_v_charge[2]{ 0.0 }; double m_v_cap = 0.0; double m_exp[2]{ 0.0 }; ); /* the high charge is clamped by the diode to 0.7V above the 5V line */ #define SKYRAID_MISSLE_CHARGE_PLUS (5.0 + 0.7) DISCRETE_STEP( skyraid_missle_custom_charge ) { int const in_1 = (SKYRAID_MISSLE_CUSTOM_IN1 == 0) ? 0 : 1; /* charge/discharge cap */ m_v_cap += (m_v_charge[in_1] - m_v_cap) * m_exp[in_1]; set_output(0, SKYRAID_MISSLE_CHARGE_PLUS - m_v_cap); } DISCRETE_RESET( skyraid_missle_custom_charge ) { /* everything is based on the input to the O.C. inverter */ /* the charging voltage across the cap */ m_v_charge[0] = 0; m_v_charge[1] = SKYRAID_MISSLE_CHARGE_PLUS * RES_VOLTAGE_DIVIDER(SKYRAID_MISSLE_CUSTOM_R1 + SKYRAID_MISSLE_CUSTOM_R2, SKYRAID_MISSLE_CUSTOM_R3); m_v_charge[1] = SKYRAID_MISSLE_CHARGE_PLUS - m_v_charge[1]; m_v_cap = 0; /* precalculate charging exponents */ /* discharge cap */ m_exp[0] = RC_CHARGE_EXP(SKYRAID_MISSLE_CUSTOM_R2 * SKYRAID_MISSLE_CUSTOM_C); /* charge cap */ m_exp[1] = RC_CHARGE_EXP(RES_2_PARALLEL(SKYRAID_MISSLE_CUSTOM_R1 + SKYRAID_MISSLE_CUSTOM_R2, SKYRAID_MISSLE_CUSTOM_R3) * SKYRAID_MISSLE_CUSTOM_C); /* starts at full voltage until cap starts charging */ set_output(0, SKYRAID_MISSLE_CHARGE_PLUS); } DISCRETE_SOUND_START( skyraid_discrete ) /************************************************ * Input register mapping ************************************************/ /* convert the PLANE_SWEEP line to voltage*/ DISCRETE_INPUTX_LOGIC(SKYRAID_PLANE_SWEEP_EN, DEFAULT_TTL_V_LOGIC_1 * RES_VOLTAGE_DIVIDER(SKYRAID_R25, SKYRAID_R24), 0, 0) DISCRETE_INPUT_LOGIC(SKYRAID_MISSILE_EN) DISCRETE_INPUT_LOGIC(SKYRAID_EXPLOSION_EN) /* convert PLANE_ON into 4066 Ron value of 270 ohms @ 5V */ DISCRETE_INPUTX_LOGIC(SKYRAID_PLANE_ON__IC_E8, 270, 0, 0) DISCRETE_INPUT_LOGIC(SKYRAID_ATTRACT_EN) /************************************************ * Noise Generator, Explosion sound ************************************************/ /* Note: the noise reset is not emulated 100% accurate */ /* According to the schematics, Attract only clears the lower 8 bits. */ /* I may modify the noise module in the future to properly emulate this, */ /* but you will never hear the difference. */ /* It only wrong for 8 cycles of the 555 while no sound is being generated. */ DISCRETE_LFSR_NOISE(SKYRAID_NOISE, /* IC F7, pin 13 */ 1, /* ENAB */ SKYRAID_ATTRACT_EN, /* RESET */ 1.49 / ((SKYRAID_R20 + 2 * SKYRAID_R19) * SKYRAID_C51), /* CLK - 555 astable source */ 1, 0, 0.5, &skyraid_lfsr) /* AMPL, FEED, BIAS */ DISCRETE_LOGIC_NOR(NODE_20, SKYRAID_EXPLOSION_EN, SKYRAID_NOISE) DISCRETE_RC_CIRCUIT_1(NODE_21, SKYRAID_EXPLOSION_EN, NODE_20, /* INP0, INP1 */ RES_2_PARALLEL(SKYRAID_R84, SKYRAID_R85 + SKYRAID_R86), SKYRAID_C68) DISCRETE_OP_AMP_FILTER(NODE_22, 1, /* ENAB */ NODE_21, 0, /* INP0, INP1 */ DISC_OP_AMP_FILTER_IS_BAND_PASS_1M, &skyraid_explosion_filter) /* TYPE,INFO */ /* IC E10, pin 14 gain and clipping */ DISCRETE_GAIN(NODE_23, NODE_22, SKYRAID_R119 / SKYRAID_R121 + 1) DISCRETE_CLAMP(SKYRAID_EXPLOSION_SND, NODE_23, -5, 12.0 - 1.5) /************************************************ * Jet, Plane sound ************************************************/ DISCRETE_RCFILTER(NODE_30, /* IC J6, pin 5 */ SKYRAID_PLANE_SWEEP_EN, /* IN0 */ RES_2_PARALLEL(SKYRAID_R25, SKYRAID_R24), SKYRAID_C49) DISCRETE_566(NODE_31, /* IC J6, pin 3 */ NODE_30, /* VMOD */ SKYRAID_R18, SKYRAID_C48, 5, -5, 5, /* VPOS,VNEG,VCHARGE */ DISC_566_OUT_COUNT_R) DISCRETE_LOGIC_SHIFT(NODE_32, /* IC H7, J7 output */ SKYRAID_NOISE, /* IC H7, J7 pins 1 & 2 */ 1, NODE_31, 16, /* RESET, CLK, SIZE */ DISC_LOGIC_SHIFT__RESET_L | DISC_LOGIC_SHIFT__LEFT | DISC_CLK_BY_COUNT) /* move bits together for ease of use */ DISCRETE_TRANSFORM4(NODE_33, NODE_32, 1, 1 << 14, 2, "01&02/3&|") DISCRETE_DAC_R1(SKYRAID_PLANE_SND, NODE_33, /* DATA */ DEFAULT_TTL_V_LOGIC_1, &skyraid_plane_dac) DISCRETE_BIT_DECODE(SKYRAID_JET_A_SND, NODE_32, 0, DEFAULT_TTL_V_LOGIC_1) /* IC H7, pin 3 */ DISCRETE_BIT_DECODE(SKYRAID_JET_B_SND, NODE_32, 15, DEFAULT_TTL_V_LOGIC_1) /* IC J7, pin 13 */ /************************************************ * Missle sound ************************************************/ DISCRETE_CUSTOM5(NODE_40, skyraid_missle_custom_charge, SKYRAID_MISSILE_EN, SKYRAID_R12, SKYRAID_R14, SKYRAID_R13, SKYRAID_C44, nullptr) DISCRETE_566(NODE_41, /* IC K6, pin 3 */ NODE_40, /* VMOD */ SKYRAID_R16, SKYRAID_C45, 5, -5, SKYRAID_MISSLE_CHARGE_PLUS, /* VPOS,VNEG,VCHARGE */ DISC_566_OUT_COUNT_R) DISCRETE_LOGIC_SHIFT(NODE_42, /* IC K7, L7 output */ SKYRAID_NOISE, /* IC K7, L7 pins 1 & 2 */ 1, NODE_41, 16, /* RESET, CLK, SIZE */ DISC_LOGIC_SHIFT__RESET_L | DISC_LOGIC_SHIFT__LEFT | DISC_CLK_BY_COUNT) DISCRETE_BIT_DECODE(SKYRAID_MSL_A_SND, NODE_42, 0, DEFAULT_TTL_V_LOGIC_1) /* IC K7, pin 3 */ DISCRETE_BIT_DECODE(SKYRAID_MSL_B_SND, NODE_42, 15, DEFAULT_TTL_V_LOGIC_1) /* IC L7, pin 13 */ /************************************************ * Final Mix ************************************************/ DISCRETE_LOGIC_INVERT(NODE_91, SKYRAID_ATTRACT_EN) DISCRETE_MIXER6(NODE_92, NODE_91, /* ENAB */ SKYRAID_EXPLOSION_SND, SKYRAID_JET_A_SND, SKYRAID_JET_B_SND, SKYRAID_MSL_A_SND, SKYRAID_MSL_B_SND, SKYRAID_PLANE_SND, &skyraid_mixer) DISCRETE_CRFILTER(NODE_93, NODE_92, /* IN0 */ SKYRAID_R122 + RES_6_PARALLEL(SKYRAID_R120, SKYRAID_R32, SKYRAID_R29, SKYRAID_R30, SKYRAID_R31, RES_2_PARALLEL(SKYRAID_R27, SKYRAID_R28)), SKYRAID_C93) /* IC E10, pin 1 gain and clipping */ DISCRETE_GAIN(NODE_94, NODE_93, - SKYRAID_R118 / (SKYRAID_R122 + RES_5_PARALLEL(SKYRAID_R120, SKYRAID_R32, SKYRAID_R29, SKYRAID_R30, SKYRAID_R31))) DISCRETE_CLAMP(NODE_95, NODE_94, -5, 12.0 - 1.5) DISCRETE_OUTPUT(NODE_95, 32700.0/8) DISCRETE_SOUND_END void skyraid_state::skyraid_sound_w(uint8_t data) { /* BIT0 => PLANE SWEEP */ /* BIT1 => MISSILE */ /* BIT2 => EXPLOSION */ /* BIT3 => START LAMP */ /* BIT4 => PLANE ON */ /* BIT5 => ATTRACT */ m_discrete->write(SKYRAID_PLANE_SWEEP_EN, data & 0x01); m_discrete->write(SKYRAID_MISSILE_EN, data & 0x02); m_discrete->write(SKYRAID_EXPLOSION_EN, data & 0x04); m_led = !BIT(data, 3); m_discrete->write(SKYRAID_PLANE_ON_EN, data & 0x10); m_discrete->write(SKYRAID_ATTRACT_EN, data & 0x20); }