// license:BSD-3-Clause // copyright-holders:Nicola Salmoria,Derrick Renaud /*************************************************************************** Taito Crazy Balloon hardware Analog emulation - Jan 2006, Derrick Renaud ***************************************************************************/ #include "emu.h" #include "includes/crbaloon.h" #include "speaker.h" /* timing sources */ #define CRBALOON_16H (CRBALOON_MASTER_XTAL/2/2/16) /* enables */ #define CRBALOON_LAUGH_EN NODE_01 #define CRBALOON_MUSIC_EN NODE_02 #define CRBALOON_MUSIC_DATA NODE_03 /* nodes - adjusters */ #define CRBALOON_VR2 NODE_05 #define CRBALOON_VR3 NODE_06 /* nodes - sounds */ #define CRBALOON_LAUGH_SND NODE_80 #define CRBALOON_MUSIC_SND NODE_81 WRITE8_MEMBER(crbaloon_state::crbaloon_audio_set_music_freq) { m_discrete->write(space, CRBALOON_MUSIC_DATA, data); } WRITE8_MEMBER(crbaloon_state::crbaloon_audio_set_music_enable) { m_discrete->write(space, CRBALOON_MUSIC_EN, data); } void crbaloon_state::crbaloon_audio_set_explosion_enable(int enabled) { m_sn->enable_w(enabled); } void crbaloon_state::crbaloon_audio_set_breath_enable(int enabled) { /* changes slf_res to 10k (middle of two 10k resistors) it also puts a tantal capacitor against GND on the output, but this section of the schematics is not readable. */ m_sn->slf_res_w(enabled ? RES_K(10) : RES_K(20) ); } void crbaloon_state::crbaloon_audio_set_appear_enable(int enabled) { /* APPEAR is connected to MIXER B */ m_sn->mixer_b_w(enabled); } WRITE8_MEMBER(crbaloon_state::crbaloon_audio_set_laugh_enable) { m_discrete->write(space, CRBALOON_LAUGH_EN, data); } static const discrete_555_desc desc_crbaloon_laugh_osc = { DISC_555_OUT_SQW | DISC_555_OUT_DC, 5, // B+ voltage of 555 DEFAULT_555_VALUES }; static const discrete_dac_r1_ladder desc_crbaloon_music_dac = { 3, {0, RES_K(470), RES_K(120)}, 5, RES_K(470), 0, 0 }; static DISCRETE_SOUND_START(crbaloon_discrete) /************************************************ * Input register mapping ************************************************/ DISCRETE_INPUT_LOGIC(CRBALOON_LAUGH_EN) DISCRETE_INPUT_LOGIC(CRBALOON_MUSIC_EN) DISCRETE_INPUT_DATA (CRBALOON_MUSIC_DATA) DISCRETE_ADJUSTMENT(CRBALOON_VR2, 0, 0.5, DISC_LINADJ, "VR2") DISCRETE_ADJUSTMENT(CRBALOON_VR3, 0, 1, DISC_LINADJ, "VR3") /************************************************ * Laugh is a VCO modulated by a constant * square wave. ************************************************/ DISCRETE_555_ASTABLE(NODE_10, 1, RES_K(10), RES_K(100), CAP_U(1), &desc_crbaloon_laugh_osc) DISCRETE_CRFILTER_VREF(NODE_11, NODE_10, 1.0/(1.0/RES_K(5) + 1.0/RES_K(10) + 1.0/RES_K(100)), // 5k & 10k are 555 internal CAP_U(10), /* The following will calculate the reference control voltage with no signal applied to the cap. */ 5.0* (1.0/(1.0/RES_K(10) + 1.0/RES_K(100))) / (RES_K(5)+(1.0/(1.0/RES_K(10) + 1.0/RES_K(100)))) ) DISCRETE_555_ASTABLE_CV(NODE_12, CRBALOON_LAUGH_EN, RES_K(1), RES_K(22), CAP_U(.1), NODE_11, &desc_crbaloon_laugh_osc) DISCRETE_MULTIPLY(NODE_13, NODE_12, CRBALOON_VR2) DISCRETE_CRFILTER(CRBALOON_LAUGH_SND, NODE_13, RES_K(20), CAP_U(1)) /************************************************ * Music Generator is amplitude modulated by a * linear ramp. ************************************************/ /* TO BE FIXED - needs proper modulation */ DISCRETE_NOTE(NODE_20, 1, CRBALOON_16H.dvalue() / 2, CRBALOON_MUSIC_DATA, 255, 7, DISC_CLK_IS_FREQ) DISCRETE_DAC_R1(NODE_21, NODE_20, DEFAULT_TTL_V_LOGIC_1, &desc_crbaloon_music_dac) DISCRETE_ONOFF(NODE_22, CRBALOON_MUSIC_EN, NODE_21) // DISCRETE_RAMP(NODE_21, 1, RAMP, GRAD, MIN, MAX, CLAMP) DISCRETE_MULTIPLY(NODE_23, NODE_22, CRBALOON_VR3) DISCRETE_CRFILTER(CRBALOON_MUSIC_SND, NODE_23, RES_K(50), CAP_U(1)) /************************************************ * Final mix and output. ************************************************/ DISCRETE_ADDER2(NODE_90, 1, CRBALOON_LAUGH_SND, CRBALOON_MUSIC_SND) DISCRETE_CRFILTER(NODE_91, NODE_90, RES_K(100), CAP_U(1)) DISCRETE_OUTPUT(NODE_91, 65000.0/12) DISCRETE_SOUND_END MACHINE_CONFIG_START(crbaloon_state::crbaloon_audio) SPEAKER(config, "mono").front_center(); MCFG_DEVICE_ADD("snsnd", SN76477) MCFG_SN76477_NOISE_PARAMS(RES_K(47), RES_K(330), CAP_P(470)) // noise + filter MCFG_SN76477_DECAY_RES(RES_K(220)) // decay_res MCFG_SN76477_ATTACK_PARAMS(CAP_U(1.0), RES_K(4.7)) // attack_decay_cap + attack_res MCFG_SN76477_AMP_RES(RES_M(1)) // amplitude_res MCFG_SN76477_FEEDBACK_RES(RES_K(200)) // feedback_res MCFG_SN76477_VCO_PARAMS(5.0, CAP_P(470), RES_K(330)) // VCO volt + cap + res MCFG_SN76477_PITCH_VOLTAGE(5.0) // pitch_voltage MCFG_SN76477_SLF_PARAMS(CAP_P(420), RES_K(20)) // slf caps + res MCFG_SN76477_ONESHOT_PARAMS(CAP_U(1.0), RES_K(47)) // oneshot caps + res MCFG_SN76477_VCO_MODE(0) // VCO mode MCFG_SN76477_MIXER_PARAMS(0, 0, 1) // mixer A, B, C MCFG_SN76477_ENVELOPE_PARAMS(1, 0) // envelope 1, 2 MCFG_SN76477_ENABLE(0) // enable MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 2.0) MCFG_DEVICE_ADD("discrete", DISCRETE, crbaloon_discrete) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0) MACHINE_CONFIG_END