// license:BSD-3-Clause
// copyright-holders:Derrick Renaud
/************************************************************************
* skyraid Sound System Analog emulation
* Sept 2009, Derrick Renaud
************************************************************************/
#include "emu.h"
#include "includes/skyraid.h"
/* Discrete Sound Input Nodes */
#define SKYRAID_PLANE_SWEEP_EN NODE_01
#define SKYRAID_MISSILE_EN NODE_02
#define SKYRAID_EXPLOSION_EN NODE_03
#define SKYRAID_PLANE_ON_EN NODE_04
#define SKYRAID_PLANE_ON__IC_E8 SKYRAID_PLANE_ON_EN
#define SKYRAID_ATTRACT_EN NODE_05
/* Discrete Sound Output Nodes */
#define SKYRAID_NOISE NODE_10
#define SKYRAID_EXPLOSION_SND NODE_11
#define SKYRAID_JET_A_SND NODE_12
#define SKYRAID_JET_B_SND NODE_13
#define SKYRAID_MSL_A_SND NODE_14
#define SKYRAID_MSL_B_SND NODE_15
#define SKYRAID_PLANE_SND NODE_16
/* Parts List - Resistors */
#define SKYRAID_R12 RES_K(1)
#define SKYRAID_R13 RES_K(10)
#define SKYRAID_R14 RES_K(100)
#define SKYRAID_R16 RES_K(10)
#define SKYRAID_R18 RES_K(10)
#define SKYRAID_R19 RES_K(10)
#define SKYRAID_R20 RES_K(47)
#define SKYRAID_R24 RES_M(10)
#define SKYRAID_R25 RES_M(3.9)
#define SKYRAID_R27 RES_M(1.5)
#define SKYRAID_R28 RES_M(1.5)
#define SKYRAID_R29 RES_M(4.7)
#define SKYRAID_R30 RES_M(1)
#define SKYRAID_R31 RES_M(1)
#define SKYRAID_R32 RES_M(4.7)
#define SKYRAID_R84 RES_K(22)
#define SKYRAID_R85 RES_K(100)
#define SKYRAID_R86 820
#define SKYRAID_R110 RES_K(330)
#define SKYRAID_R118 RES_K(470)
#define SKYRAID_R119 RES_K(10)
#define SKYRAID_R120 RES_K(220)
#define SKYRAID_R121 RES_K(1)
#define SKYRAID_R122 RES_K(150)
/* Parts List - Capacitors */
#define SKYRAID_C44 CAP_U(4.7)
#define SKYRAID_C45 CAP_U(.0047)
#define SKYRAID_C46 CAP_U(.001)
#define SKYRAID_C48 CAP_U(.0047)
#define SKYRAID_C49 CAP_U(.1)
#define SKYRAID_C50 CAP_U(.001)
#define SKYRAID_C51 CAP_U(.01)
#define SKYRAID_C68 CAP_U(10)
#define SKYRAID_C85 CAP_U(.068)
#define SKYRAID_C86 CAP_U(.1)
#define SKYRAID_C93 CAP_U(.1)
static const discrete_lfsr_desc skyraid_lfsr =
{
DISC_CLK_IS_FREQ,
16, /* Bit Length */
0, /* Reset Value */
0, /* Use Bit 0 as XOR input 0 */
14, /* Use Bit 14 as XOR input 1 */
DISC_LFSR_XNOR, /* Feedback stage1 is XNOR */
DISC_LFSR_OR, /* Feedback stage2 is just stage 1 output OR with external feed */
DISC_LFSR_REPLACE, /* Feedback stage3 replaces the shifted register contents */
0x000001, /* Everything is shifted into the first bit only */
DISC_LFSR_FLAG_RESET_TYPE_H, /* Output is not inverted */
15 /* Output bit */
};
static const discrete_op_amp_filt_info skyraid_explosion_filter =
{
SKYRAID_R85, 0, SKYRAID_R86, 0, SKYRAID_R110, /* r1, r2, r3, r4, rF*/
SKYRAID_C85, SKYRAID_C86, 0, /* c1, c2, c3 */
0, 12, -5, /* vRef, vP, vN */
};
static const discrete_dac_r1_ladder skyraid_plane_dac =
{
2, {SKYRAID_R28, SKYRAID_R27},
0, 0, 0, 0 /* no vBias, rBias, rGnd, cFilter */
};
static const discrete_mixer_desc skyraid_mixer =
{
DISC_MIXER_IS_RESISTOR,
{SKYRAID_R120, SKYRAID_R32, SKYRAID_R29, SKYRAID_R30, SKYRAID_R31, RES_2_PARALLEL(SKYRAID_R28, SKYRAID_R27)},
{0, 0, 0, 0, 0, SKYRAID_PLANE_ON__IC_E8}, /* r_nodes */
{0}, 0, 0, 0, 0, 0, 1 /* no c, rI, rF, cF, cAmp, vRef, gain */
};
/************************************************************************
*
* Custom skyraid missle charge
*
* input[0] - In1 (Logic)
* input[1] - R1
* input[2] - R2
* input[3] - R3
* input[4] - C
*
* 12V 5V
* v v
* | |
* Z ---
* Z R1 ^ 1N914
* Z / \ Diode
* | -----
* | |
* +--------------+
* | |
* --- Z
* --- C Z R2
* | Z
* | |
* +--------------+----> Node Output
* |
* Z
* Z R3
* O.C. Z
* |\ |
* In1 >--| o--+
* |/
*
************************************************************************/
#define SKYRAID_MISSLE_CUSTOM_IN1 DISCRETE_INPUT(0)
#define SKYRAID_MISSLE_CUSTOM_R1 DISCRETE_INPUT(1)
#define SKYRAID_MISSLE_CUSTOM_R2 DISCRETE_INPUT(2)
#define SKYRAID_MISSLE_CUSTOM_R3 DISCRETE_INPUT(3)
#define SKYRAID_MISSLE_CUSTOM_C DISCRETE_INPUT(4)
DISCRETE_CLASS_STEP_RESET(skyraid_missle_custom_charge, 2,
double m_v_charge[2];
double m_v_cap;
double m_exp[2];
);
/* the high charge is clamped by the diode to 0.7V above the 5V line */
#define SKYRAID_MISSLE_CHARGE_PLUS (5.0 + 0.7)
DISCRETE_STEP( skyraid_missle_custom_charge )
{
int in_1 = (SKYRAID_MISSLE_CUSTOM_IN1 == 0) ? 0 : 1;
/* charge/discharge cap */
m_v_cap += (m_v_charge[in_1] - m_v_cap) * m_exp[in_1];
set_output(0, SKYRAID_MISSLE_CHARGE_PLUS - m_v_cap);
}
DISCRETE_RESET( skyraid_missle_custom_charge )
{
/* everything is based on the input to the O.C. inverter */
/* the charging voltage across the cap */
m_v_charge[0] = 0;
m_v_charge[1] = SKYRAID_MISSLE_CHARGE_PLUS * RES_VOLTAGE_DIVIDER(SKYRAID_MISSLE_CUSTOM_R1 + SKYRAID_MISSLE_CUSTOM_R2, SKYRAID_MISSLE_CUSTOM_R3);
m_v_charge[1] = SKYRAID_MISSLE_CHARGE_PLUS - m_v_charge[1];
m_v_cap = 0;
/* precalculate charging exponents */
/* discharge cap */
m_exp[0] = RC_CHARGE_EXP(SKYRAID_MISSLE_CUSTOM_R2 * SKYRAID_MISSLE_CUSTOM_C);
/* charge cap */
m_exp[1] = RC_CHARGE_EXP(RES_2_PARALLEL(SKYRAID_MISSLE_CUSTOM_R1 + SKYRAID_MISSLE_CUSTOM_R2, SKYRAID_MISSLE_CUSTOM_R3) * SKYRAID_MISSLE_CUSTOM_C);
/* starts at full voltage until cap starts charging */
set_output(0, SKYRAID_MISSLE_CHARGE_PLUS);
}
DISCRETE_SOUND_START( skyraid_discrete )
/************************************************
* Input register mapping
************************************************/
/* convert the PLANE_SWEEP line to voltage*/
DISCRETE_INPUTX_LOGIC(SKYRAID_PLANE_SWEEP_EN, DEFAULT_TTL_V_LOGIC_1 * RES_VOLTAGE_DIVIDER(SKYRAID_R25, SKYRAID_R24), 0, 0)
DISCRETE_INPUT_LOGIC(SKYRAID_MISSILE_EN)
DISCRETE_INPUT_LOGIC(SKYRAID_EXPLOSION_EN)
/* convert PLANE_ON into 4066 Ron value of 270 ohms @ 5V */
DISCRETE_INPUTX_LOGIC(SKYRAID_PLANE_ON__IC_E8, 270, 0, 0)
DISCRETE_INPUT_LOGIC(SKYRAID_ATTRACT_EN)
/************************************************
* Noise Generator, Explosion sound
************************************************/
/* Note: the noise reset is not emulated 100% accurate */
/* According to the schematics, Attract only clears the lower 8 bits. */
/* I may modify the noise module in the future to properly emulate this, */
/* but you will never hear the difference. */
/* It only wrong for 8 cycles of the 555 while no sound is being generated. */
DISCRETE_LFSR_NOISE(SKYRAID_NOISE, /* IC F7, pin 13 */
1, /* ENAB */
SKYRAID_ATTRACT_EN, /* RESET */
1.49 / ((SKYRAID_R20 + 2 * SKYRAID_R19) * SKYRAID_C51), /* CLK - 555 astable source */
1, 0, 0.5, &skyraid_lfsr) /* AMPL, FEED, BIAS */
DISCRETE_LOGIC_NOR(NODE_20, SKYRAID_EXPLOSION_EN, SKYRAID_NOISE)
DISCRETE_RC_CIRCUIT_1(NODE_21,
SKYRAID_EXPLOSION_EN, NODE_20, /* INP0, INP1 */
RES_2_PARALLEL(SKYRAID_R84, SKYRAID_R85 + SKYRAID_R86), SKYRAID_C68)
DISCRETE_OP_AMP_FILTER(NODE_22,
1, /* ENAB */
NODE_21, 0, /* INP0, INP1 */
DISC_OP_AMP_FILTER_IS_BAND_PASS_1M, &skyraid_explosion_filter) /* TYPE,INFO */
/* IC E10, pin 14 gain and clipping */
DISCRETE_GAIN(NODE_23, NODE_22, SKYRAID_R119 / SKYRAID_R121 + 1)
DISCRETE_CLAMP(SKYRAID_EXPLOSION_SND, NODE_23, -5, 12.0 - 1.5)
/************************************************
* Jet, Plane sound
************************************************/
DISCRETE_RCFILTER(NODE_30, /* IC J6, pin 5 */
SKYRAID_PLANE_SWEEP_EN, /* IN0 */
RES_2_PARALLEL(SKYRAID_R25, SKYRAID_R24), SKYRAID_C49)
DISCRETE_566(NODE_31, /* IC J6, pin 3 */
NODE_30, /* VMOD */
SKYRAID_R18, SKYRAID_C48,
5, -5, 5, /* VPOS,VNEG,VCHARGE */
DISC_566_OUT_COUNT_R)
DISCRETE_LOGIC_SHIFT(NODE_32, /* IC H7, J7 output */
SKYRAID_NOISE, /* IC H7, J7 pins 1 & 2 */
1, NODE_31, 16, /* RESET, CLK, SIZE */
DISC_LOGIC_SHIFT__RESET_L | DISC_LOGIC_SHIFT__LEFT | DISC_CLK_BY_COUNT)
/* move bits together for ease of use */
DISCRETE_TRANSFORM4(NODE_33, NODE_32, 1, 1 << 14, 2, "01&02/3&|")
DISCRETE_DAC_R1(SKYRAID_PLANE_SND,
NODE_33, /* DATA */
DEFAULT_TTL_V_LOGIC_1, &skyraid_plane_dac)
DISCRETE_BIT_DECODE(SKYRAID_JET_A_SND, NODE_32, 0, DEFAULT_TTL_V_LOGIC_1) /* IC H7, pin 3 */
DISCRETE_BIT_DECODE(SKYRAID_JET_B_SND, NODE_32, 15, DEFAULT_TTL_V_LOGIC_1) /* IC J7, pin 13 */
/************************************************
* Missle sound
************************************************/
DISCRETE_CUSTOM5(NODE_40, skyraid_missle_custom_charge, SKYRAID_MISSILE_EN, SKYRAID_R12, SKYRAID_R14, SKYRAID_R13, SKYRAID_C44, nullptr)
DISCRETE_566(NODE_41, /* IC K6, pin 3 */
NODE_40, /* VMOD */
SKYRAID_R16, SKYRAID_C45,
5, -5, SKYRAID_MISSLE_CHARGE_PLUS, /* VPOS,VNEG,VCHARGE */
DISC_566_OUT_COUNT_R)
DISCRETE_LOGIC_SHIFT(NODE_42, /* IC K7, L7 output */
SKYRAID_NOISE, /* IC K7, L7 pins 1 & 2 */
1, NODE_41, 16, /* RESET, CLK, SIZE */
DISC_LOGIC_SHIFT__RESET_L | DISC_LOGIC_SHIFT__LEFT | DISC_CLK_BY_COUNT)
DISCRETE_BIT_DECODE(SKYRAID_MSL_A_SND, NODE_42, 0, DEFAULT_TTL_V_LOGIC_1) /* IC K7, pin 3 */
DISCRETE_BIT_DECODE(SKYRAID_MSL_B_SND, NODE_42, 15, DEFAULT_TTL_V_LOGIC_1) /* IC L7, pin 13 */
/************************************************
* Final Mix
************************************************/
DISCRETE_LOGIC_INVERT(NODE_91, SKYRAID_ATTRACT_EN)
DISCRETE_MIXER6(NODE_92,
NODE_91, /* ENAB */
SKYRAID_EXPLOSION_SND,
SKYRAID_JET_A_SND,
SKYRAID_JET_B_SND,
SKYRAID_MSL_A_SND,
SKYRAID_MSL_B_SND,
SKYRAID_PLANE_SND,
&skyraid_mixer)
DISCRETE_CRFILTER(NODE_93,
NODE_92, /* IN0 */
SKYRAID_R122 + RES_6_PARALLEL(SKYRAID_R120, SKYRAID_R32, SKYRAID_R29, SKYRAID_R30, SKYRAID_R31, RES_2_PARALLEL(SKYRAID_R27, SKYRAID_R28)),
SKYRAID_C93)
/* IC E10, pin 1 gain and clipping */
DISCRETE_GAIN(NODE_94, NODE_93, - SKYRAID_R118 / (SKYRAID_R122 + RES_5_PARALLEL(SKYRAID_R120, SKYRAID_R32, SKYRAID_R29, SKYRAID_R30, SKYRAID_R31)))
DISCRETE_CLAMP(NODE_95, NODE_94, -5, 12.0 - 1.5)
DISCRETE_OUTPUT(NODE_95, 32700.0/8)
DISCRETE_SOUND_END
void skyraid_state::skyraid_sound_w(uint8_t data)
{
/* BIT0 => PLANE SWEEP */
/* BIT1 => MISSILE */
/* BIT2 => EXPLOSION */
/* BIT3 => START LAMP */
/* BIT4 => PLANE ON */
/* BIT5 => ATTRACT */
m_discrete->write(SKYRAID_PLANE_SWEEP_EN, data & 0x01);
m_discrete->write(SKYRAID_MISSILE_EN, data & 0x02);
m_discrete->write(SKYRAID_EXPLOSION_EN, data & 0x04);
m_led = !BIT(data, 3);
m_discrete->write(SKYRAID_PLANE_ON_EN, data & 0x10);
m_discrete->write(SKYRAID_ATTRACT_EN, data & 0x20);
}