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-rw-r--r--trunk/src/mame/audio/skyraid.c301
1 files changed, 301 insertions, 0 deletions
diff --git a/trunk/src/mame/audio/skyraid.c b/trunk/src/mame/audio/skyraid.c
new file mode 100644
index 00000000000..9e11c7e1b2a
--- /dev/null
+++ b/trunk/src/mame/audio/skyraid.c
@@ -0,0 +1,301 @@
+/************************************************************************
+ * 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 )
+ /************************************************
+ * 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, NULL)
+ 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
+
+
+WRITE8_DEVICE_HANDLER( skyraid_sound_w )
+{
+ /* BIT0 => PLANE SWEEP */
+ /* BIT1 => MISSILE */
+ /* BIT2 => EXPLOSION */
+ /* BIT3 => START LAMP */
+ /* BIT4 => PLANE ON */
+ /* BIT5 => ATTRACT */
+
+ discrete_sound_w(device, SKYRAID_PLANE_SWEEP_EN, data & 0x01);
+ discrete_sound_w(device, SKYRAID_MISSILE_EN, data & 0x02);
+ discrete_sound_w(device, SKYRAID_EXPLOSION_EN, data & 0x04);
+ set_led_status(device->machine(), 0, !(data & 0x08));
+ discrete_sound_w(device, SKYRAID_PLANE_ON_EN, data & 0x10);
+ discrete_sound_w(device, SKYRAID_ATTRACT_EN, data & 0x20);
+}