1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/*************************************************************************
audio\avalnche.c
*************************************************************************/
#include "driver.h"
#include "avalnche.h"
#include "sound/discrete.h"
/* Discrete Sound Input Nodes */
#define AVALNCHE_AUD0_EN NODE_01
#define AVALNCHE_AUD1_EN NODE_02
#define AVALNCHE_AUD2_EN NODE_03
#define AVALNCHE_SOUNDLVL_DATA NODE_04
#define AVALNCHE_ATTRACT_EN NODE_05
/***************************************************************************
avalnche_noise_amplitude_w
***************************************************************************/
WRITE8_HANDLER( avalnche_noise_amplitude_w )
{
discrete_sound_w(AVALNCHE_SOUNDLVL_DATA, data & 0x3f);
}
WRITE8_HANDLER( avalnche_attract_enable_w )
{
discrete_sound_w(AVALNCHE_ATTRACT_EN, data & 0x01);
}
WRITE8_HANDLER( avalnche_audio_w )
{
int bit = data & 0x01;
switch (offset & 0x07)
{
case 0x00: /* AUD0 */
discrete_sound_w(AVALNCHE_AUD0_EN, bit);
break;
case 0x01: /* AUD1 */
discrete_sound_w(AVALNCHE_AUD1_EN, bit);
break;
case 0x02: /* AUD2 */
default:
discrete_sound_w(AVALNCHE_AUD2_EN, bit);
break;
}
}
/************************************************************************/
/* avalnche Sound System Analog emulation */
/************************************************************************/
static const discrete_lfsr_desc avalnche_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 */
0, /* Output is already inverted by XNOR */
15 /* Output bit */
};
/* Nodes - Sounds */
#define AVALNCHE_NOISE NODE_10
#define AVALNCHE_AUD1_SND NODE_11
#define AVALNCHE_AUD2_SND NODE_12
#define AVALNCHE_SOUNDLVL_AUD0_SND NODE_13
DISCRETE_SOUND_START(avalnche)
/************************************************/
/* avalnche Effects Relataive Gain Table */
/* */
/* Effect V-ampIn Gain ratio Relative */
/* Aud0 3.8 50/(50+33+39) 725.6 */
/* Aud1 3.8 50/(50+68) 750.2 */
/* Aud2 3.8 50/(50+68) 750.2 */
/* Soundlvl 3.8 50/(50+33+.518) 1000.0 */
/************************************************/
/************************************************/
/* Input register mapping for avalnche */
/************************************************/
/* NODE GAIN OFFSET INIT */
DISCRETE_INPUT_LOGIC (AVALNCHE_AUD0_EN)
DISCRETE_INPUT_LOGIC (AVALNCHE_AUD1_EN)
DISCRETE_INPUT_LOGIC (AVALNCHE_AUD2_EN)
DISCRETE_INPUTX_DATA (AVALNCHE_SOUNDLVL_DATA, 500.0/63, 0, 0.0)
DISCRETE_INPUT_NOT (AVALNCHE_ATTRACT_EN)
/************************************************/
/* Aud0 = 2V = HSYNC/4 = 15750/4 */
/* Aud1 = 32V = HSYNC/64 = 15750/64 */
/* Aud2 = 8V = HSYNC/16 = 15750/16 */
/************************************************/
DISCRETE_SQUAREWFIX(NODE_20, AVALNCHE_AUD0_EN, 15750.0/4, 725.6, 50.0, 0, 0.0) // Aud0
DISCRETE_SQUAREWFIX(AVALNCHE_AUD1_SND, AVALNCHE_AUD1_EN, 15750.0/64, 750.2, 50.0, 0, 0.0)
DISCRETE_SQUAREWFIX(AVALNCHE_AUD2_SND, AVALNCHE_AUD2_EN, 15750.0/16, 750.2, 50.0, 0, 0.0)
/************************************************/
/* Soundlvl is variable amplitude, filtered */
/* random noise. */
/* LFSR clk = 16V = 15750.0Hz/16/2 */
/************************************************/
DISCRETE_LFSR_NOISE(AVALNCHE_NOISE, AVALNCHE_ATTRACT_EN, AVALNCHE_ATTRACT_EN, 15750.0, AVALNCHE_SOUNDLVL_DATA, 0, 0, &avalnche_lfsr)
DISCRETE_ADDER2(NODE_30, 1, NODE_20, AVALNCHE_NOISE)
DISCRETE_RCFILTER(AVALNCHE_SOUNDLVL_AUD0_SND, 1, NODE_30, 556.7, 1e-7)
/************************************************/
/* Final mix and output. */
/************************************************/
DISCRETE_ADDER3(NODE_90, AVALNCHE_ATTRACT_EN, AVALNCHE_AUD1_SND, AVALNCHE_AUD2_SND, AVALNCHE_SOUNDLVL_AUD0_SND)
DISCRETE_OUTPUT(NODE_90, 65534.0/(725.6+750.2+750.2+1000.0))
DISCRETE_SOUND_END
|