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Diffstat (limited to 'trunk/src/mame/audio/madalien.c')
-rw-r--r-- | trunk/src/mame/audio/madalien.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/trunk/src/mame/audio/madalien.c b/trunk/src/mame/audio/madalien.c new file mode 100644 index 00000000000..45997f39bff --- /dev/null +++ b/trunk/src/mame/audio/madalien.c @@ -0,0 +1,259 @@ +/************************************************************************ + * 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 ) + /************************************************ + * 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 |