// 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