// license:BSD-3-Clause // copyright-holders:Derrick Renaud,Hans Andersson /*************************************************************************** Sigma Spiders hardware To Do: add filters ***************************************************************************/ #include "emu.h" #include "includes/spiders.h" #include "machine/6821pia.h" #include "sound/discrete.h" #include "speaker.h" /* Discrete Sound Input Nodes */ #define SPIDERS_WEB_SOUND_DATA NODE_01 #define SPIDER_WEB_SOUND_MOD_DATA NODE_02 #define SPIDERS_FIRE_EN NODE_03 #define SPIDERS_EXP_EN NODE_04 #define SPIDERS_SUPER_WEB_EN NODE_05 #define SPIDERS_SUPER_WEB_EXPL_EN NODE_06 #define SPIDERS_X_EN NODE_07 #define SPIDERS_SOUND_CLK 6000000 /* 6 MHZ*/ /************************************************************************/ /* Spiders Sound System Analog emulation */ /* Written by Hans Andersson, Aug 2005 */ /* Schematics by Don Maeby */ /* */ /* Todo - Add proper sound mixer */ /************************************************************************/ static const discrete_dac_r1_ladder spiders_sound_dac = { 4, // size of ladder {RES_K(68), RES_K(47), RES_K(33), RES_K(33)}, // R21, R31, R30, R50 DEFAULT_TTL_V_LOGIC_1, 0, // no rBias 0, // no rGnd 0 // no cap }; /* The noice generator consists of two LS164 plus a LS74, so the lenght is 8+8+1 */ static const discrete_lfsr_desc spiders_lfsr = { DISC_CLK_IS_FREQ, 17, /* Bit Length */ 0, /* Reset Value */ 4, /* Use Bit 4 (QE of first LS164) as F0 input 0 */ 16, /* Use Bit 16 (LS74) as F0 input 1 */ DISC_LFSR_XOR_INV_IN1,/* F0 is XOR with input 1 inverted */ DISC_LFSR_IN0, /* F1 is 1*F0*/ DISC_LFSR_REPLACE, /* F2 replaces the shifted register contents */ 0x000001, /* Everything is shifted into the first bit only */ 1, /* Output is inverted Q of LS74*/ 16 /* Output bit */ }; static const discrete_dac_r1_ladder spiders_fire_dac = { 1, {RES_K(10)}, // R29 5, // 555 Vcc RES_K(5), // 555 internal RES_K(10), // 555 internal CAP_N(100) // C100 }; static const discrete_dac_r1_ladder spiders_web_exp_dac = { 1, {RES_K(10)}, // R44 5, // 555 Vcc RES_K((5*2.2)/(5+2.2)), // 555 internal (5k) // R49 (2.2k) RES_K(10), // 555 internal CAP_U(0.01) // C25 }; // IC 10 static const discrete_555_desc spiders_fire_555a = { DISC_555_OUT_SQW | DISC_555_OUT_DC, 5, // B+ voltage of 555 DEFAULT_555_VALUES }; static const discrete_555_desc spiders_super_web_555a = { DISC_555_OUT_CAP | DISC_555_OUT_DC, 5, // B+ voltage of 555 DEFAULT_555_VALUES }; /* Nodes - Sounds */ #define SPIDERS_WEB_SOUND NODE_08 #define SPIDERS_NOISE NODE_09 #define SPIDERS_FIRE NODE_10 #define SPIDERS_EXPL NODE_11 #define SPIDERS_SW_EXPL NODE_12 #define SPIDERS_SW NODE_13 #define SPIDERS_X NODE_14 static DISCRETE_SOUND_START(spiders_discrete) /************************************************/ /* Input register mapping for spiders */ /************************************************/ DISCRETE_INPUT_DATA (SPIDERS_WEB_SOUND_DATA) DISCRETE_INPUT_DATA (SPIDER_WEB_SOUND_MOD_DATA) DISCRETE_INPUT_LOGIC(SPIDERS_FIRE_EN) DISCRETE_INPUT_LOGIC(SPIDERS_EXP_EN) DISCRETE_INPUT_LOGIC(SPIDERS_SUPER_WEB_EXPL_EN) DISCRETE_INPUT_LOGIC(SPIDERS_SUPER_WEB_EN) DISCRETE_INPUT_LOGIC(SPIDERS_X_EN) /* Web sound */ DISCRETE_NOTE(NODE_20, 1, SPIDERS_SOUND_CLK/8, SPIDERS_WEB_SOUND_DATA, 255, 15, DISC_CLK_IS_FREQ) DISCRETE_TRANSFORM2(NODE_21, NODE_20, SPIDER_WEB_SOUND_MOD_DATA, "01&") DISCRETE_DAC_R1(NODE_22, NODE_21, DEFAULT_TTL_V_LOGIC_1, &spiders_sound_dac) /* Noise */ /* LFSR NOISE Should be 3 MHz, but setting it to 6KHz should make no difference (except wasting less CPU cycles) since we sample it at 3.75 kHz */ DISCRETE_LFSR_NOISE(NODE_30, 1, 1, SPIDERS_SOUND_CLK/(1000), 1, 0, 0.5, &spiders_lfsr) DISCRETE_SQUAREWFIX(NODE_31, 1, SPIDERS_SOUND_CLK/(10*10*16),1, 50.0, 0.5, 0) /* 3.75 kHz */ DISCRETE_SAMPLHOLD(NODE_32,NODE_30,NODE_31,DISC_SAMPHOLD_REDGE) /* Fire */ DISCRETE_DAC_R1(NODE_40, NODE_32, DEFAULT_TTL_V_LOGIC_1, &spiders_fire_dac) // Fire envelope DISCRETE_MULTIPLY(NODE_41, DEFAULT_TTL_V_LOGIC_1, SPIDERS_FIRE_EN) DISCRETE_RCFILTER(NODE_42, NODE_41,RES_K(2.2),CAP_U(47)) //R11, C11 DISCRETE_TRANSFORM4(NODE_43, NODE_40, NODE_42, 2.5, 24.5,"012*3/-") DISCRETE_555_ASTABLE_CV(NODE_44, 1, RES_K(10), RES_K(22), CAP_N(100), NODE_43, &spiders_fire_555a) //R10, R18, C12 DISCRETE_MULTIPLY(NODE_45, DEFAULT_TTL_V_LOGIC_1-0.7, SPIDERS_FIRE_EN) // Diode drop D2 DISCRETE_ASWITCH(NODE_46, NODE_44, NODE_45, DISC_CD4066_THRESHOLD) /* Explosion */ DISCRETE_MULTIPLY(NODE_50, DEFAULT_TTL_V_LOGIC_1, SPIDERS_EXP_EN) DISCRETE_RCDISC5(NODE_51, 1, NODE_50, RES_M(1),CAP_U(0.47)) //R51, C8 DISCRETE_MULTIPLY(NODE_52, DEFAULT_TTL_V_LOGIC_1, NODE_32) // Noise 0/1 -> TTL DISCRETE_ASWITCH(NODE_53, NODE_52, NODE_51, DISC_CD4066_THRESHOLD) /*Super web explosion*/ DISCRETE_DAC_R1(NODE_60, NODE_32, DEFAULT_TTL_V_LOGIC_1, &spiders_web_exp_dac) DISCRETE_555_ASTABLE_CV(NODE_61, 1, RES_K(10), RES_K(22), CAP_N(22), NODE_60, &spiders_fire_555a) //R48, R47, C24 DISCRETE_MULTIPLY(NODE_62, DEFAULT_TTL_V_LOGIC_1, SPIDERS_SUPER_WEB_EXPL_EN) DISCRETE_RCDISC5(NODE_63, 1, NODE_62, RES_M(1),CAP_U(0.47)) //R9, C9 DISCRETE_ASWITCH(NODE_64, NODE_61, NODE_63, DISC_CD4066_THRESHOLD) /*Super web */ DISCRETE_555_ASTABLE_CV(NODE_70, 1, RES_K(330), 0, CAP_U(1), -1, &spiders_super_web_555a) //R46, C23 DISCRETE_MULTIPLY(NODE_71, 57/47, NODE_70) // R27, R28 DISCRETE_555_ASTABLE_CV(NODE_72, SPIDERS_SUPER_WEB_EN, RES_K(100), RES_K(330), CAP_U(0.01), NODE_71, &spiders_super_web_555a) //R22, R33, C16 DISCRETE_555_ASTABLE_CV(NODE_73, SPIDERS_X_EN, RES_K(100), RES_K(470), CAP_N(47), NODE_71, &spiders_super_web_555a) // R23, R32, C15 DISCRETE_ADDER4(NODE_89, 1, NODE_22, NODE_46, NODE_53, NODE_64) DISCRETE_ADDER3(NODE_90, 1, NODE_72, NODE_73, NODE_89) DISCRETE_OUTPUT(NODE_90, 10000) DISCRETE_SOUND_END WRITE8_MEMBER(spiders_state::spiders_audio_command_w) { m_pia[3]->porta_w(data & 0xf8); m_pia[3]->ca1_w(data & 0x80 ? 1 : 0); } WRITE8_MEMBER(spiders_state::spiders_audio_a_w) { m_discrete->write(space, SPIDER_WEB_SOUND_MOD_DATA, 1 + (data & 4) * 8 + (data & 2) * 4 + (data & 1) * 2); } WRITE8_MEMBER(spiders_state::spiders_audio_b_w) { m_discrete->write(space, SPIDERS_WEB_SOUND_DATA, data); } WRITE8_MEMBER(spiders_state::spiders_audio_ctrl_w) { m_discrete->write(space, SPIDERS_FIRE_EN, data & 0x10 ? 1 : 0); m_discrete->write(space, SPIDERS_EXP_EN, data & 0x08 ? 1 : 0); m_discrete->write(space, SPIDERS_SUPER_WEB_EXPL_EN, data & 0x04 ? 1 : 0); m_discrete->write(space, SPIDERS_SUPER_WEB_EN, data & 0x02 ? 1 : 0); m_discrete->write(space, SPIDERS_X_EN, data & 0x01 ? 1 : 0); } MACHINE_CONFIG_START(spiders_state::spiders_audio) SPEAKER(config, "mono").front_center(); MCFG_DEVICE_ADD("discrete", DISCRETE, spiders_discrete) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0) MACHINE_CONFIG_END