5 |
6 | ## SoftSN Machine
7 |
8 | Hardware emulation of the Texas Instruments SN76477 "Complex Sound Generator" sound chip. Released in 1978, it was used in arcade games including Space Invaders and in popular electronic toys such as the Remco SoundFX machine.
9 |
10 | [SoftSN Manual](docs/SoftSN.md) • [Video (Youtube)](https://youtu.be/6BLhJZEeeeY) • [Download](https://github.com/8Mode/8Mode-VCV_Modules/releases)
11 |
12 | [How to install Plugins](https://vcvrack.com/manual/Installing.html#installing-plugins)
13 |
14 |
15 | 
4 |
5 | ## Theory of Operation
6 |
7 | The SN76477 is an analog/digital hybrid sound chip released in 1978. The SoftSN Machine provides controls and simulates the analog circuitry including 4 RC oscillators, voltage level inputs and digital inputs around a SN76477 emulator. This provides a fairly accurate reproduction of the real thing in a way that could be built in electronics from 1978 - including the quirks and limitations.
8 |
9 | [SN76477 Datasheet](SN76477.pdf)
10 |
11 | 
15 |
16 | ## Input Controls
17 |
18 | * Input Panel (on left) - Provides v/oct, trig or -5/+5 CV inputs to modulate controls.
19 | * VCO - Adjust frequency of the VCO Oscillator
20 | * Attack/Decay - Adjusts attack and decay phase of 1-Shot triggers. Also provides effects in VCO/Alt mode.
21 | * SLF - Adjust frequency of Super Low Frequency VCO
22 | * Noise - Adjust noise frequency and filter
23 | * One Shot - When envelope mode is 1 Shot, sound is triggered by button/Trig input. Length sets sound duration.
24 | * Duty - Adjusts the duty cycle of the VCO. This can be used to transistion the TRI output to a SAW wave
25 | * Mixers - Selects which oscillators are multiplexed for output
26 | * Envelope - Selects how the mixer performs multiplexing
27 | * OSC - Selects the source for the VCO. SLF modulates the VCO with the SLF.
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/plugin.json:
--------------------------------------------------------------------------------
1 | {
2 | "slug": "8Mode",
3 | "name": "8Mode",
4 | "version": "2.0.0",
5 | "license": "BSD-3-Clause",
6 | "brand": "8Mode",
7 | "author": "Matt Dwyer, 8Mode",
8 | "authorEmail": "matt@8mode.com",
9 | "authorUrl": "",
10 | "pluginUrl": "",
11 | "manualUrl": "https://github.com/8Mode/8Mode-VCV_Modules/blob/master/README.md",
12 | "sourceUrl": "https://github.com/8Mode/8Mode-VCV_Modules",
13 | "donateUrl": "https://www.paypal.me/8ModeLLC",
14 | "changelogUrl": "",
15 | "modules": [
16 | {
17 | "slug": "softSN",
18 | "name": "softSN Machine",
19 | "description": "",
20 | "tags": [
21 | "Oscillator",
22 | "Synth voice"
23 | ]
24 | }
25 | ]
26 | }
27 |
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/res/8Mode_Knob1.svg:
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1 |
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4 |
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/res/8Mode_ss_0.svg:
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1 |
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/res/8Mode_ss_1.svg:
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1 |
2 |
3 |
4 |
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/src/8mode.cpp:
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1 | #include "8mode.hpp"
2 |
3 |
4 | Plugin *pluginInstance;
5 |
6 |
7 | void init(Plugin *p) {
8 | pluginInstance = p;
9 |
10 | // Add all Models defined throughout the pluginInstance
11 | p->addModel(modelsoftSN);
12 |
13 | // Any other pluginInstance initialization may go here.
14 | // As an alternative, consider lazy-loading assets and lookup tables when your module is created to reduce startup times of Rack.
15 | }
16 |
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/src/8mode.hpp:
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1 | #include "rack.hpp"
2 | #include "widgets.hpp"
3 |
4 | using namespace rack;
5 |
6 | // Forward-declare the Plugin, defined in Template.cpp
7 | extern Plugin *pluginInstance;
8 |
9 | // Forward-declare each Model, defined in each module source file
10 | extern Model *modelsoftSN;
11 |
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/src/rescap.h:
--------------------------------------------------------------------------------
1 | // license:BSD-3-Clause
2 | // copyright-holders:Aaron Giles
3 | #ifndef MAME_MACHINE_RESCAP_H
4 | #define MAME_MACHINE_RESCAP_H
5 |
6 | /* Little helpers for magnitude conversions */
7 | #define RES_R(res) ((double)(res))
8 | #define RES_K(res) ((double)(res) * 1e3)
9 | #define RES_M(res) ((double)(res) * 1e6)
10 | #define RES_INF (-1)
11 | #define CAP_U(cap) ((double)(cap) * 1e-6)
12 | #define CAP_N(cap) ((double)(cap) * 1e-9)
13 | #define CAP_P(cap) ((double)(cap) * 1e-12)
14 | #define IND_U(ind) ((double)(ind) * 1e-6)
15 | #define IND_N(ind) ((double)(ind) * 1e-9)
16 | #define IND_P(ind) ((double)(ind) * 1e-12)
17 |
18 | /* vin --/\r1/\-- out --/\r2/\-- gnd */
19 | #define RES_VOLTAGE_DIVIDER(r1, r2) ((double)(r2) / ((double)(r1) + (double)(r2)))
20 |
21 | #define RES_2_PARALLEL(r1, r2) (((r1) * (r2)) / ((r1) + (r2)))
22 | #define RES_3_PARALLEL(r1, r2, r3) (1.0 / (1.0 / (r1) + 1.0 / (r2) + 1.0 / (r3)))
23 | #define RES_4_PARALLEL(r1, r2, r3, r4) (1.0 / (1.0 / (r1) + 1.0 / (r2) + 1.0 / (r3) + 1.0 / (r4)))
24 | #define RES_5_PARALLEL(r1, r2, r3, r4, r5) (1.0 / (1.0 / (r1) + 1.0 / (r2) + 1.0 / (r3) + 1.0 / (r4) + 1.0 / (r5)))
25 | #define RES_6_PARALLEL(r1, r2, r3, r4, r5, r6) (1.0 / (1.0 / (r1) + 1.0 / (r2) + 1.0 / (r3) + 1.0 / (r4) + 1.0 / (r5) + 1.0 / (r6)))
26 |
27 | #define RES_2_SERIAL(r1,r2) ((r1)+(r2))
28 |
29 | #endif // MAME_MACHINE_RESCAP_H
30 |
--------------------------------------------------------------------------------
/src/sn76477.cpp:
--------------------------------------------------------------------------------
1 | // Modified for use with SoftSN Machine VCVRack Module by Matt Dwyer/8Mode LLC matt@8mode.com
2 | // Original License and Copyright follows
3 | //
4 |
5 | // license:BSD-3-Clause
6 | // copyright-holders:Zsolt Vasvari
7 | // thanks-to:Derrick Renaud
8 | /*****************************************************************************
9 |
10 | Texas Instruments SN76477 emulator
11 |
12 | authors: Derrick Renaud - info
13 | Zsolt Vasvari - software
14 |
15 | (see sn76477.h for details)
16 | Notes:
17 | * All formulas were derived by taking measurements of a real device,
18 | then running the data sets through the numerical analysis
19 | application at http://zunzun.com to come up with the functions.
20 |
21 | Known issues/to-do's:
22 | * Use RES_INF for unconnected resistor pins and treat 0 as a short
23 | circuit
24 |
25 | * VCO
26 | * confirm value of VCO_MAX_EXT_VOLTAGE, VCO_TO_SLF_VOLTAGE_DIFF
27 | VCO_CAP_VOLTAGE_MIN and VCO_CAP_VOLTAGE_MAX
28 | * confirm value of VCO_MIN_DUTY_CYCLE
29 | * get real formulas for VCO cap charging and discharging
30 | * get real formula for VCO duty cycle
31 | * what happens if no vco_res
32 | * what happens if no vco_cap (needed for laserbat/lazarian)
33 |
34 | * Attack/Decay
35 | * get real formulas for a/d cap charging and discharging
36 |
37 | * Output
38 | * what happens if output is taken at pin 12 with no feedback_res
39 | (needed for laserbat/lazarian)
40 |
41 | *****************************************************************************/
42 |
43 | #include "sn76477.h"
44 | #include