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Commodore 64 SID chip

 

 

 

commodore amiga500

infoCountry: USA
Weight : 1,8 Kg
Dimensions (classic): 40,4 x 21.6 x 7,5 cm
audio demo trend price : 50€
manual schematics video comments

AUDIO CHIP MOS 6581 / 8580
for Commodore 64 (1982)

The Paula audio chip was implemented into the commodore 64, all-time best seller into 2 main versions: MOS 6581 and MOS 8580 (for updated c64 boards). Sid is considered like a true synthesizer.

-> The purpose of this page is not the CBM64 itself as we focus only to SOUND and MUSIC applications related to the retro computer world.

mos 6581
commodore 64 box

info C64 / VIC64 HOME COMPUTER the main panel features a brown keyboard (66 keys) but no numeric pad.
Rear panel terminal connectors:
- cartridge slot
- TV connector (HF-Modulator- analog)
- audio/video DIN connector
- serial bus (generally for disk drive)
- cassette interface 12 pins
- user port
Side panel terminal connectors:
- joystick (x2) 9-pins Atari type.

ac Power supply is an external custom PSU (9V AC / +5V DC).

 

 

editOVERVIEW is based on a 8 -bits MOS 6510 CPU (about 1 MHz) derived from previous 6502 also can be an optimized MOS 8500. Graphic interface is managed by a 16 colors VIC-II (video interface chip at 320x200 pixels) MOS 6559 for PAL system.
TECH: all data and IC are based on my Assy rev.C PAL 1983.


MOS 6510


editCBM 64 SOUND the SID (Sound Interface Device) a 28-pin DIP capsule audio chip was projected in 1982 by Robert Yannes (who worked for the Ensoniq Mirage sampler) for the American 8-bits computer Commodore 64 then revamped model C128.
The SID chip is a mixture of digital and analogue technology with phase accumulated oscillators and analogue multimode NMOS filter.
SID generates 3 channels or oscillators (5 shapes: triangle, saw, mixed, noise, pulse variable width) with variable parameters:
- ringmodulator: an oscillator modulates the previous one e.g: 3>2 - 2>1 - 1>3
- pitch detune
- hardsynch
- transpose
- delay start
- PWM (variable width).


mos 6581

commodore 64 motherboard
click for zoom

 



edit
SID REVISIONS the 6581 was used on first commodore 64 from 1982 to 1986 with 4 main revisions (called "R1" "R2" [...] new updated C64 used the 8580 technically compatible with softwares but they did sound different mainly for filter structure.
TIP: modern SWINSID hardware replacement with new features.

mos 6581

 

 

edit FILTER multimode resonant filter with cutoff range from 30 Hz to 12 kHz:
- lowpass at 2 poles
- bandpass at 1 pole
- highpass at 2 poles
- band reject at 1 pole
The Cmb64 can filter external sources using the audio/video DIN connector.

pinout

 

adsr ENVELOPE 4 EGs, 4 stages ADSR structure :
- EG1 OSC1 amp
- EG2 OSC2 amp
- EG3 OSC3 amp
- EG4 VCF filter.

 

c64 audio



lfo LFO
up to 4 bipolar delayed assignable modulators with fade-in, variable depth.
The modulators are identical and features 7 shapes; in addition 2 LFO can be combined for more complex waveforms.

 



edit
MEMORY 64 Kb Ram (8 X soldered IC 4116) - data can be saved usually to custom tape device or 5¼" disk drive like CBM1541 but some moderns geek stuff managed to add custom hard disk, usb drive, flash memory and more.

tape usb





edit OS
is basically composed by 3 EPROM:
- 901227-3 KERNAL
- 901226-01 BASIC
- 901225-1 Characters map.


kickstart




edit Audio and music hardware some musical third part societies developed some hardware able to exploit internal SID or other sonic technologies from this era.

roland tr505

Audio expansion module:

- Siel Sound Buggy
- SFX sound expander based on FM synthesis VIDEO

sidstation

speech processor (hardware)

- magic voice VIDEO
- currah VIDEO
- voice messenger
- voice command module
- votalker VIDEO

edit Special Commodore 64 Impossibile Mission speech page

mode machine sid sound sampler

- SFX VIDEO
siel midi cbm64 Midi interface and keyboard

 

 

edit RELATED FAMILY:

roland tr505

Commodore 64 main model series:
- 64C white (new board with new sid)
- 128 a new computer with cbm64 mode
- SX64 a portable C64 in a suitcase and monitor.

sidstation Elektron Sidstation A Midi commercial module based on MOS sid
mode machine sid

MODE MACHINE SID 8-Bit Desktop Synthesizer & Groove Box with emulated SID or slot for genuine SID VIDEO

Twisted electrons Therapdsid is a commercial SID clone with some controls VIDEO

customcoomodore 64

MODDED various CBM64 have been customized with audio enhancements like 2 sids , real time functions and more VIDEO

VARIOUS HARDWARE Other DIY projects like SAMMICH, HARDSID USB ucapps.de VIDEO

commodore 64 vst Commodore SID VST instruments softwares: many!
- pure 6581, delamancha, REFX, 38911 Bytes, tony bytes bleep, dream 64 and countless samples collections.


 

video VIDEO CLIP SELECTION

video1 video2 video3
famous game music weird audio station commercial from 1985

 

commodore 64 cat
Marcel the synthcat



commodore 64 big

 

commodore sid

 


manual
MANUAL

 


manual
C64 SCHEMATICS / SERVICE MANUAL

commodore banner

 

 

brochure
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ugly gallery:

commodore 64 girl
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commodore 64 ugly
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commodore banner


Commodore 64 FOR SALE

CHECK OUT EBAY OFFERS

 


 

 

circuit drum pad amiga


manual

-history
-sound
-cheap

manual

- time reliability
- obsolete

comment



REVIEW : "Sid is something incredible, a cheap but great synthesizer for the mass: the music will never play 2 times the same way! "

 


COMMENTS

 

 

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Commodore 64 5.0 out of 5 based on 1 ratings. price €50