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/***************************************************************************
Sigma Spiders hardware
***************************************************************************/
#include "driver.h"
#include "sound/discrete.h"
#include "machine/6821pia.h"
#include "includes/spiders.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)
/************************************************/
/* 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, 1, 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_32,1,NODE_30,NODE_31,DISC_SAMPHOLD_REDGE)
/* Fire */
DISCRETE_DAC_R1(NODE_40, 1, NODE_32, DEFAULT_TTL_V_LOGIC_1, &spiders_fire_dac)
// Fire envelope
DISCRETE_MULTIPLY(NODE_41, 1, DEFAULT_TTL_V_LOGIC_1, SPIDERS_FIRE_EN)
DISCRETE_RCFILTER(NODE_42, 1, 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, 1, DEFAULT_TTL_V_LOGIC_1-0.7, SPIDERS_FIRE_EN) // Diode drop D2
DISCRETE_ASWITCH(NODE_46,1, NODE_44, NODE_45, DISC_CD4066_THRESHOLD)
/* Explosion */
DISCRETE_MULTIPLY(NODE_50, 1, 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, 1, DEFAULT_TTL_V_LOGIC_1, NODE_32) // Noise 0/1 -> TTL
DISCRETE_ASWITCH(NODE_53, 1, NODE_52, NODE_51, DISC_CD4066_THRESHOLD)
/*Super web explosion*/
DISCRETE_DAC_R1(NODE_60, 1, 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, 1, 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, 1, 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, 1, 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_HANDLER( spiders_audio_command_w )
{
pia_set_input_a(4, data & 0xf8, 0);
pia_set_input_ca1(4, data & 0x80 ? 1 : 0);
}
WRITE8_HANDLER( spiders_audio_a_w )
{
discrete_sound_w(space, SPIDER_WEB_SOUND_MOD_DATA, 1 + (data & 4) * 8 + (data & 2) * 4 + (data & 1) * 2);
}
WRITE8_HANDLER( spiders_audio_b_w )
{
discrete_sound_w(space, SPIDERS_WEB_SOUND_DATA, data);
}
WRITE8_HANDLER( spiders_audio_ctrl_w )
{
discrete_sound_w(space, SPIDERS_FIRE_EN, data & 0x10 ? 1 : 0);
discrete_sound_w(space, SPIDERS_EXP_EN, data & 0x08 ? 1 : 0);
discrete_sound_w(space, SPIDERS_SUPER_WEB_EXPL_EN, data & 0x04 ? 1 : 0);
discrete_sound_w(space, SPIDERS_SUPER_WEB_EN, data & 0x02 ? 1 : 0);
discrete_sound_w(space, SPIDERS_X_EN, data & 0x01 ? 1 : 0);
}
MACHINE_DRIVER_START( spiders_audio )
MDRV_SPEAKER_STANDARD_MONO("mono")
MDRV_SOUND_ADD("discrete", DISCRETE, 0)
MDRV_SOUND_CONFIG_DISCRETE(spiders)
MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MACHINE_DRIVER_END
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