// license:BSD-3-Clause // copyright-holders:Derrick Renaud /************************************************************************ * madalien Sound System Analog emulation * Aug 2008, Derrick Renaud ************************************************************************/ #include "emu.h" #include "includes/madalien.h" #include "sound/discrete.h" /* Discrete Sound Input Nodes */ /* see also "madalien.h" */ #define MADALIEN_8910_PORTA_1 NODE_03 #define MADALIEN_8910_PORTA_2 NODE_04 #define MADALIEN_8910_PORTA_3 NODE_05 #define MADALIEN_8910_PORTA_4 NODE_06 #define MADALIEN_8910_PORTA_5 NODE_07 #define MADALIEN_8910_PORTA_6 NODE_08 #define MADALIEN_8910_PORTA_8 NODE_09 #define MADALIEN_8910_PORTB_1 NODE_10 #define MADALIEN_8910_PORTB_23 NODE_11 #define MADALIEN_8910_PORTB_45 NODE_12 #define MADALIEN_8910_PORTB_6 NODE_13 #define MADALIEN_8910_PORTB_7 NODE_14 #define MADALIEN_8910_PSG_A NODE_15 #define MADALIEN_8910_PSG_B NODE_16 #define MADALIEN_8910_PSG_C NODE_17 static const discrete_op_amp_filt_info madalien_psg_a_filter = { RES_K(1)+ 270, 0, RES_K(10), 0, RES_K(100), CAP_U(.1), CAP_U(.1), 0, 0, 5, -5 }; static const discrete_op_amp_filt_info madalien_psg_c_filter = { RES_K(1)+ 270, 0, RES_K(10), 0, RES_K(100), CAP_U(.068), CAP_U(.068), 0, 0, 5, -5 }; static const discrete_mixer_desc madalien_psg_mix = { DISC_MIXER_IS_RESISTOR, {RES_K(10), RES_K(10), RES_K(10)}, {0}, {0}, 0, 0, 0, 0, 0, 1 }; static const discrete_555_desc madalien_555_1f = { // the 555 will clock a 74161, which counts on rising edges DISC_555_TRIGGER_IS_LOGIC | DISC_555_OUT_DC | DISC_555_OUT_COUNT_R_X, 5.0-.5, // B+ voltage of 555 - diode drop DEFAULT_555_VALUES }; static const discrete_555_desc madalien_555_1c = { // the 555 will clock a 74161, which counts on rising edges DISC_555_TRIGGER_IS_LOGIC | DISC_555_OUT_DC | DISC_555_OUT_COUNT_R_X, 5, // B+ voltage of 555 DEFAULT_555_VALUES }; static const discrete_555_desc madalien_555_1l = { DISC_555_TRIGGER_IS_LOGIC | DISC_555_OUT_DC | DISC_555_OUT_CAP, 5, // B+ voltage of 555 DEFAULT_555_VALUES }; static const discrete_comp_adder_table madalien_555_1f_r_select = { DISC_COMP_P_RESISTOR, 0, 2, {RES_K(22+1), RES_K(15+1)} }; static const discrete_comp_adder_table madalien_effect_1b_vol_r = { DISC_COMP_P_RESISTOR, 0, 2, {270, RES_K(22) + 270} }; static const discrete_dac_r1_ladder madalien_effect1a_dac = { 4, {RES_K(22), RES_K(22), 0, RES_K(22)}, 0, 0, 0, 0 }; static const discrete_dac_r1_ladder madalien_effect1b_dac = { 2, {RES_K(22), RES_K(22)}, 0, 0, 0, 0 }; static const discrete_dac_r1_ladder madalien_effect2_dac = { 4, {0, RES_K(33), RES_K(22), RES_K(33)}, 0, 0, 0, 0 }; // resistor effect of 555 internal resistors at pin 5 static const discrete_mixer_desc madalien_555_1c_cv = { DISC_MIXER_IS_RESISTOR, {RES_K(1.5), RES_K(5)}, {0}, {0}, 0, RES_K(10), 0, 0, 0, 1 }; static const discrete_mixer_desc madalien_final_mix = { DISC_MIXER_IS_RESISTOR, {RES_K(10), RES_K(10)/3, RES_K(10), RES_K(10), RES_K(22) + RES_K(22)/3, RES_K(22) + RES_K(22) + RES_K(22)/2, RES_K(33) + 1.0 / (1.0/RES_K(33) + 1.0/RES_K(22) + 1.0/RES_K(33))}, {MADALIEN_8910_PORTA_1, 0, MADALIEN_8910_PORTA_5, MADALIEN_8910_PORTA_8, MADALIEN_8910_PORTB_1, NODE_59, 0}, {0}, 0, RES_K(100), 0, CAP_U(1), 0, 32768.0/DEFAULT_TTL_V_LOGIC_1 // final gain }; DISCRETE_SOUND_START( madalien_discrete ) /************************************************ * Input register mapping ************************************************/ DISCRETE_INPUT_DATA(MADALIEN_8910_PORTA) DISCRETE_INPUT_DATA(MADALIEN_8910_PORTB) /************************************************ * Convert to individual bits ************************************************/ // Port A is used to turn filtering on/off. // 1 - player shot, siren, music // turn bit into 4066 Ron value of 270 ohms @ 5V DISCRETE_TRANSFORM3(MADALIEN_8910_PORTA_1, MADALIEN_8910_PORTA, 0x01, 270, "01&2*") // 2 - player explosion DISCRETE_TRANSFORM2(MADALIEN_8910_PORTA_2, MADALIEN_8910_PORTA, 0x02, "01&") // 3 - rub wall DISCRETE_TRANSFORM2(MADALIEN_8910_PORTA_3, MADALIEN_8910_PORTA, 0x04, "01&") // 4 - is it even triggered? DISCRETE_TRANSFORM2(MADALIEN_8910_PORTA_4, MADALIEN_8910_PORTA, 0x08, "01&") // 5 - siren, music (out of phase copy of 1 for echo effect) DISCRETE_TRANSFORM3(MADALIEN_8910_PORTA_5, MADALIEN_8910_PORTA, 0x10, 270, "01&2*") // 6 - enemy explosions DISCRETE_TRANSFORM2(MADALIEN_8910_PORTA_6, MADALIEN_8910_PORTA, 0x20, "01&") // 8 - enemy spin, beep DISCRETE_TRANSFORM3(MADALIEN_8910_PORTA_8, MADALIEN_8910_PORTA, 0x80, 270, "01&2*") //Port B controls motor sounds // 1,2,3 - Player motor volume DISCRETE_TRANSFORM3(MADALIEN_8910_PORTB_1, MADALIEN_8910_PORTB, 0x01, 270, "01&2*") DISCRETE_TRANSFORM3(MADALIEN_8910_PORTB_23, MADALIEN_8910_PORTB, 0x06, 2, "01&2/") // 4,5 - Player motor speed DISCRETE_TRANSFORM3(MADALIEN_8910_PORTB_45, MADALIEN_8910_PORTB, 0x18, 8, "01&2/") // 6 - Enemy motor enable DISCRETE_TRANSFORM2(MADALIEN_8910_PORTB_6, MADALIEN_8910_PORTB, 0x20, "01&") // 7 - Enemy motor speed // convert bit 7 to voltage level // 2 diodes reduce voltage by 1V. DISCRETE_TRANSFORM3(MADALIEN_8910_PORTB_7, MADALIEN_8910_PORTB, 0x40, (DEFAULT_TTL_V_LOGIC_1 - 1) / 0x40, "01&2*") /************************************************ * PSG input streams ************************************************/ // AY-3-8910 PSG have a 1Vpp level DISCRETE_INPUTX_STREAM(MADALIEN_8910_PSG_A, 0, 2.0/32768, .250) DISCRETE_INPUTX_STREAM(MADALIEN_8910_PSG_B, 1, 2.0/32768, .250) DISCRETE_INPUTX_STREAM(MADALIEN_8910_PSG_C, 2, 2.0/32768, .250) /************************************************ * AY-3-8910 filtering ************************************************/ // top op-amp DISCRETE_ONOFF(NODE_20, MADALIEN_8910_PORTA_2, MADALIEN_8910_PSG_A) DISCRETE_OP_AMP_FILTER(NODE_21, 1, NODE_20, 0, DISC_OP_AMP_FILTER_IS_BAND_PASS_1M, &madalien_psg_a_filter) // middle op-amp // pin 3 DISCRETE_MULTIPLY(NODE_30, MADALIEN_8910_PSG_B, RES_K(3.3)/(RES_K(3.3)+RES_K(3.3))) DISCRETE_ONOFF(NODE_31, MADALIEN_8910_PORTA_4, NODE_30) // pin 2 DISCRETE_TRANSFORM3(NODE_32, MADALIEN_8910_PSG_A, NODE_30, -RES_K(10)/RES_K(3.3), "01-2*1+") // pin 1 DISCRETE_SWITCH(NODE_33, 1, MADALIEN_8910_PORTA_3, NODE_31, NODE_32) DISCRETE_CLAMP(NODE_34, NODE_33, -5, 5.0-1.5) // bottom op-amp DISCRETE_ONOFF(NODE_40, MADALIEN_8910_PORTA_6, MADALIEN_8910_PSG_B) DISCRETE_OP_AMP_FILTER(NODE_41, 1, NODE_40, 0, DISC_OP_AMP_FILTER_IS_BAND_PASS_1M, &madalien_psg_c_filter) DISCRETE_MIXER3(NODE_48, 1, NODE_21, NODE_33, NODE_41, &madalien_psg_mix) /************************************************ * Player motor ************************************************/ DISCRETE_555_ASTABLE(NODE_50, // cap is buffered by op-amp 2D. 1, // always enabled RES_K(4.7), RES_K(22), CAP_U(2.2), &madalien_555_1l) // The speed frequencies seem strange but the components have been GuruVerified // There is not much change in selected frequency. 99Hz, 110.6Hz, 124Hz DISCRETE_COMP_ADDER(NODE_51, MADALIEN_8910_PORTB_45, &madalien_555_1f_r_select) DISCRETE_555_ASTABLE_CV(NODE_52, // IC 1F pin 3 out MADALIEN_8910_PORTB_45, // enabled by gate O2 pin 13 NODE_51, RES_K(10), // per actual board CAP_U(.22), NODE_50, // IC 1F pin 5 in &madalien_555_1f) // convert reset to active high for module use DISCRETE_LOGIC_INVERT(NODE_53, MADALIEN_8910_PORTB_45) DISCRETE_COUNTER(NODE_54, 1, NODE_53, // pin 7 in NODE_52, // pin 1 in 0, 15, 1, 0, DISC_CLK_BY_COUNT) // 4-bit binary up counter DISCRETE_DAC_R1(NODE_55, NODE_54, DEFAULT_TTL_V_LOGIC_1, &madalien_effect1a_dac) DISCRETE_DAC_R1(NODE_56, NODE_54, DEFAULT_TTL_V_LOGIC_1, &madalien_effect1b_dac) DISCRETE_RCFILTER(NODE_57, NODE_56, RES_K(22)/2 + RES_K(22), CAP_U(.033)) DISCRETE_COMP_ADDER(NODE_59, MADALIEN_8910_PORTB_23, &madalien_effect_1b_vol_r) /************************************************ * Enemy motor ************************************************/ DISCRETE_CRFILTER(NODE_60, MADALIEN_8910_PORTB_7, RES_K(100), CAP_U(4.7)) // 2 diodes clamp it positive. DISCRETE_CLAMP(NODE_62, NODE_60, 0, 12) // the 0.047uF cap to ground just removes real world spikes. // it does not have to be simulated. DISCRETE_MIXER2(NODE_64, 1, NODE_62, 5, &madalien_555_1c_cv) DISCRETE_555_ASTABLE_CV(NODE_65, // IC 1C pin 3 out MADALIEN_8910_PORTB_6, RES_K(47), RES_K(22), CAP_U(.033), NODE_64, // IC 1C pin 5 in &madalien_555_1c) // convert reset to active high for module use DISCRETE_LOGIC_INVERT(NODE_66, MADALIEN_8910_PORTB_6) DISCRETE_COUNTER(NODE_67, 1, NODE_66, // pin 7 in NODE_65, // pin 1 in 0, 15, 1, 0, DISC_CLK_BY_COUNT) // 4-bit binary up counter DISCRETE_DAC_R1(NODE_68, NODE_67, DEFAULT_TTL_V_LOGIC_1, &madalien_effect2_dac) /************************************************ * Mixer ************************************************/ DISCRETE_MIXER7(NODE_90, 1, MADALIEN_8910_PSG_A, NODE_48, MADALIEN_8910_PSG_B, MADALIEN_8910_PSG_C, NODE_56, NODE_57, NODE_68, &madalien_final_mix) DISCRETE_OUTPUT(NODE_90, 1.1) DISCRETE_SOUND_END