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[[File:Curtis Electromusic Specialities logo.png|right|150px]]'''OnChip Systems''' formerly known as '''Curtis Electromusic Specialities'''.
Most '''Curtis Electromusic Specialities''' or '''CEM''' [[IC]]s have part numbers of the form "33nn", and synth designers and techs often speak these part numbers without further attribution.<ref name="emwcem">Electronic Music wiki:[http://electronicmusic.wikia.com/wiki/Curtis_Electromusic Curtis Electromusic]</ref>


==The company==
== The company ==
Founded by [[Doug Curtis]] in 1979 specifically to design and manufacture integrated circuits for [[Synthesizers|music synthesizers]]. Curtis Electromusic Specialties manufacturered a wide variety of ICs, many of which incorporated an entire synthesizer functional component, for example, the 3340, which contained a complete [[voltage controlled oscillator]]. By using chips from Curtis (and its competitor, [[SSM]]), synth manufacturers were able to considerably reduce the size of their circuitry. This (along with the advent of inexpensive [[microprocessor]] control) is what led to the wave of [[polyphonic]] [[analog synthesizer]]s in the 1980s. By using the Curtis and SSM chips, manufacturers were able to shrink the size of their circuitry to where it could all fit in a package no larger than what was necessary to also house a keyboard and control panel.<ref name="emwcem"/>
After working for four years at [[Interdesign, Inc.]] [[Doug Curtis]] went on to found Curtis Electromusic Specialties in 1979.<ref name="strom">[http://synth.stromeko.net/DIY.html#CEMpics Pictures of dead CEM chips] at Stromeko Synth World</ref> He did this specifically to design and manufacture [[integrated circuit]]s for [[Synthesizers|music synthesizers]]. Curtis Electromusic Specialties manufacturered a wide variety of [[Integrated circuit|ICs]], many of which incorporated an entire synthesizer functional component, for example, the [[CEM3340]], which contained a complete [[voltage controlled oscillator]]. By using chips from Curtis (and its competitor, [[SSM]]), synth manufacturers were able to considerably reduce the size of their circuitry. This (along with the advent of inexpensive [[microprocessor]] control) is what led to the wave of [[polyphonic]] [[analog synthesizer]]s in the 1980s. By using the Curtis and SSM chips, manufacturers were able to shrink the size of their circuitry to where it could all fit in a package no larger than what was necessary to also house a keyboard and control panel.<ref name="emwcem">[http://electronicmusic.wikia.com/wiki/Curtis_Electromusic Curtis Electromusic], Electronic Music wiki</ref>


Later developments included more highly integrated circuits such as the 3389 signal processor and the 3396 synth-on-a-chip. The further miniaturaization led to the creation of [[rackmount synthesizer]]s, played via [[MIDI]] from a [[keyboard controller|master keyboard]], and saving performers both money and space. However, Doug Curtis folded his interest in CEM into OnChip Systems in 1988, and further design work on music synthesis products ended. Curtis himself largely moved out of the music field, occasionally doing consulting work with synth manufacturers until his untimely death in 2007.<ref name="emwcem"/>
Later developments included more highly integrated circuits such as the 3389 signal processor and the 3396 synth-on-a-chip. The further miniaturaization led to the creation of [[rackmount synthesizer]]s, played via [[MIDI]] from a [[keyboard controller|master keyboard]], and saving performers both money and space.<ref name="emwcem"/><ref>[https://web.archive.org/web/20171012050739/http://curtiselectromusic.com/Home_Page.html About the Company], Curtis Electromusic</ref>


== OnChip Systems ==
Although the company still maintains a web page, it is no longer doing business. Before his death in 2007, Curtis apparently helped [[Dave Smith Instruments]] secure a supply of certain CEM chips to use in their [[Evolver]] line of synths. Whether these chips are new production or just stock that Curtis had warehoused is unclear.<ref name="emwcem"/>
In 1988 with the advent of digital technology and software, Doug Curtis broadened his focus beyond synthesizers forming OnChip Systems and did no further design work on music synthesis products, except for occasional consulting for synth manufacturers until his premature death in 2007. Several more patents in his name are assigned for chips designed into various commercial products.<ref name="emwcem"/><ref>[https://web.archive.org/web/20130429124424/http://curtiselectromusic.com/Doug_Curtis.html Doug Curtis], Curtis Electromusic</ref><ref>[https://web.archive.org/web/20171012050739/http://curtiselectromusic.com/Home_Page.html About the Company], Curtis Electromusic</ref>


In 2016 OnChip Systems re-released the 3340, in response to [[Coolaudio International Ltd.|Coolaudio's]] [http://www.coolaudio.com/features-page.php?product=V3340D V3340] re-design of the part to the same specifications.<ref>[https://www.facebook.com/curtischips/posts/1173548609342828 Curtis Electromusic Specialties], Facebook, 5 June 2016</ref><ref>[https://ask.audio/articles/curtis-family-speaks-out-against-behringer-synth-clone-plans-using-cem3340 Curtis Family Speaks Out Against Behringer Synth Clone Plans Using CEM3340] by Rounik Sethi, Ask.Audio, 21 Mar 2017</ref>
==CEM ICs==
*[[CEM3310]] - [[Envelope generator|Voltage Controlled Envelope Generator]]
*[[CEM3320]] - Voltage Controlled Filter
*[[CEM3328]] - Dual Voltage Controlled Amplifier
*[[CEM3330]] - Dual Voltage Controlled Amplifier
*[[CEM3335]] - Dual Voltage Controlled Amplifier
*[[CEM3340]] - Voltage Controlled Oscillator
*[[CEM3345]] - Voltage Controlled Oscillator
*[[CEM3350]] - Dual VC State Variable Filter
*[[CEM3360]] - Dual VCA
*[[CEM3365]] - Fast Dual DAC Multiplier
*[[CEM3372]] - uP Controllable Signal Processor
*[[CEM3374]] - Dual VCO
*[[CEM3378]] -
*[[CEM3379]] -
*[[CEM3381]] - Dual Low Rise VCA
*[[CEM3382]] - Dual Low Rise VCA
*[[CEM3385]] - Dual Low Noise V.C. Filter
*[[CEM3387]] - Low Noise V.C. Signal Processor
*[[CEM3389]] - Voltage Controlled Signal Processor
*[[CEM3391]] - uP Controllable Dynamic Signal Processor
*[[CEM3394]] -
*[[CEM3396]] - uP Controlled Waveshaper/Filter
*[[CEM5310]] - Hex ADSR and VCA
*[[CEM5315]] - Quant ADSR and Octave Divider
*[[CEM5508]] - Octal Sample & Hold
*[[CEM5512]] - Octal Double Buffered Sample and Hold
*[[CEM5510]] - Fast Octal Sample & Hold
*[[CEM5530]] - 30 Channel Sample & Hold
*[[CEM5570]] - Bus Controlled Signal Processor
<ref name="cemds">CEM data sheets</ref><ref name="sch">Various schematics, see [[Resources]]</ref><ref name="cempo">Curtis Electromusic [http://curtiselectromusic.com/Product_Overview.html Product Overview]</ref><ref>[http://www.synthtech.com/cem/cemdata.html ''What chip do I have in my synth?''] at www.synthtech.com</ref>


== CEM ICs used in ==
== Clones ==
[[Alfa Rpar AS]] produces the AS33xx equivalent ICs in DIP and SMT packages.
*[[Akai AX-60]] - 6 CEM3394

*[[Akai AX-80]] - 6 CEM3372
== The designs ==
*[[Bananna Poly Synth]] - 12 CEM3310, 12 CEM3340, 12 CEM3360
CEM ICs have part numbers of the form "33nn", and synth designers and techs often speak these part numbers without further attribution.<ref name="emwcem"/> De-encapsulated (defective) CEM ICs are obviously bipolar arrays, although Interdesign or Ferranti die marks are missing. They exactly match the 1980 databook ''201 Analog IC Designs'' from Interdesign.<ref name="strom" />
*[[Böhm Soundlab]] - CEM3310, CEM3320, CEM3330, CEM3340

*[[Buchla 296e]] - 1 CEM3360
== CEM ICs ==
*[[Cheetah MS6]] - 6 CEM3396 
* [[CEM3310]] – [[Envelope generator|Voltage controlled envelope generator]] (VCEG)
*[[Crumar Bit 01]] - 6 CEM3328 in late models
* [[CEM3320]] – [[Voltage controlled filter]] (VCF)
*[[Crumar Spirit]] - 2 CEM3340, 2 CEM3350, 3 CEM3360
* [[CEM3328]] – Four pole low pass VCF
*[[Crumar Trilogy]] - 6 CEM3310, 6 CEM3320, 6 CEM3330
* [[CEM3330]] – Dual voltage controlled amplifier (VCA)
*[[Digisound 80-10]] - 1 CEM3310
*[[Digisound 80-16]] - 1 CEM3350
* [[CEM3335]] – Dual VCA
* [[CEM3340]] – [[Voltage controlled oscillator]] (VCO)
*[[Digisound 80-18]] - 1 CEM3310
*[[Digisound 80-19]] - 1 CEM3360
* [[CEM3345]] – VCO
* [[CEM3350]] – Dual VC state variable filter (VCSVF)
*[[Digisound 80-2]] - 1 CEM3340
*[[Digisound 80-21]] - 1 CEM3340
* [[CEM3360]] – Dual VCA
* [[CEM3365]] – Fast Dual [[DAC]] multiplier
*[[Digisound 80-3]] - 1 CEM3340
* [[CEM3372]] - µP controllable signal processor
*[[Digisound 80-4]] - 3 CEM3330
*[[Digisound 80-6]] - 1 CEM3320
* [[CEM3374]] – Dual VCO
* [[CEM3378]] – Voltage controlled signal processor, (two-channel [[voltage controlled mixer]], four-pole low-pass VCF, and VCA)
*[[Digisound 80-7]] - 1 CEM3320, 1 CEM3335
* [[CEM3379]] – Voltage controlled signal processor, (two-channel voltage controlled output pan, four-pole low-pass VCF, and VCA)
*[[Digisound 80-9]] - 1 CEM3330
* [[CEM3381]] / PDA381 – Dual low rise VCA
*[[Digisound 80-C9]] - 2 CEM3310, 2 CEM3340, 1 CEM3360, 1 CEM3372
* [[CEM3382]] / PDA382 – Dual low rise VCA
*[[Digisound 80 Dev-91]] - 1 CEM3391
* [[CEM3385]] – Dual low noise VCF
*[[Doepfer A-106-6]] - CEM3379
* [[CEM3387]] – Low noise voltage controlled signal processor
*[[Doepfer A107]] - CEM3379
* [[CEM3389]] – Voltage controlled signal processor
*[[Doepfer A-109 ]] - CEM3379
* [[CEM3391]] - µP controllable dynamic signal processor
*[[Doepfer A-111-1]] - CEM3340
* [[CEM3394]] - µP controllable [[synthesizer voice]]
*[[Doepfer A-111-2]] - CEM3394?
* [[CEM3396]] - µP controlled [[Waveshaper]]/Filter
*[[Doepfer A-111-5]] - CEM3394
*[[Doepfer A121 ]] - CEM3320
* [[CEM5310]] – Hex [[ADSR]] and VCA
* [[CEM5315]] – Quant ADSR and [[octave Divider]]
*[[Doepfer A122]] - CEM3320, CEM3379 in newer versions
* [[CEM5508]] / PD508 – Octal [[sample & hold]]
*[[Doepfer A123 ]] - CEM3320
* [[CEM5512]] – Octal double buffered sample & hold
*[[Doepfer A124]] - CEM3379
* [[CEM5510]] – Fast octal sample & hold, custom-made for sequential Circuits
*[[Doepfer A-126]] - CEM3382
* [[CEM5530]] – 30 channel sample & hold, custom-made for sequential Circuits
*[[Doepfer A-130]] - CEM3381 in earlier models, alternately CEM3382
* [[CEM5570]] – [[Bus]] controlled signal processor
*[[Doepfer A131]] - CEM3381 in earlier models, alternately CEM3382
<ref name="cemds">CEM data sheets</ref><ref name="sch">Various schematics</ref><ref name="cempo">Curtis Electromusic [https://web.archive.org/web/20130502090659/http://curtiselectromusic.com/Product_Overview.html Product Overview]</ref><ref>[http://www.synthtech.com/cem/cemdata.html ''What chip do I have in my synth?''] at www.synthtech.com</ref>
*[[Doepfer A132-3 ]] - CEM3360

*[[Doepfer A-134]] - CEM3381
== Synthesizers using CEM ICs ==
*[[Doepfer A179]] - CEM3320
=== Prebuilt ===
*[[Doepfer Dark Energy]] - CEM3394
* Akai AX-60 – 6 x CEM3394
*[[E&MM Spectrum]] - 2 CEM3310, 1 CEM3320, 2 CEM3330, 3 CEM3340
* Akai AX-80 – 6 x CEM3372
*[[Elka Synthex]] - 8 CEM3320
* Akai VX600 - 12 x CEM3374B, 12 x CEM3378
*[[Ensoniq ESQ1]] - 1 CEM3360, 8 CEM3379
* Behringer Crave - 1 x CEM3340
*[[Ensoniq ESQ2]] - 1 CEM3360
* Behringer Neutron - 2 x CEM3340
*[[Ensoniq Mirage]] - 8 CEM3328
* Buchla 296e – 1 x CEM3360
*[[Ensoniq SQ-80]] - 1 CEM3360, 8 CEM3379
* Cheetah MS6 – 6 x CEM3396
*[[Ensoniq SQ-81]] - 1 CEM3360
* Crumar Bit 99 – 6 x CEM3328
*[[Erik G's EH-30 Modular]] - 2 CEM3310, 4 CEM3330, 4 CEM3340
* Crumar Bit One – 6 x CEM3328 in late models
*[[Fairlight CMI II]] - 8 CEM3320, in earlier versions
* Crumar Composer – 2 x CEM3310, 2 x CEM3320, 2 x CEM3330
*[[Fender/Rhodes Chroma]] - 8 CEM3350, 8 CEM3360
* Crumar Spirit – 2 x CEM3340, 2 x CEM3350, 3 x CEM3360
*[[Fender/Rhodes Polaris]] - 6 CEM3372, 6 CEM3374
* Crumar Stratus – 6 x CEM3310, 6 x CEM3320, 6 x CEM3330
*[[Keytek CTS-2000]] - 8 CEM3389, 1 CEM5530
* Crumar Trilogy – 6 x CEM3310, 6 x CEM3320, 6 x CEM3330
*[[Linndrum]] - 2 CEM3320, 1 CEM3360
* Doepfer A-106-6 XP Filter - CEM3379
*[[MIDIbox 3396]] - CEM3396 
* Doepfer A-107 Multitype Morphing Filter - CEM3379
*[[Moog Memorymoog]] - 12 CEM3310, 19 CEM3340, 26 CEM3360
* Doepfer A-109 Voltage Controlled Signal Processor - CEM3379
*[[Oberheim DX]] - 3 CEM3328
* Doepfer A-111-1 High-End VCO - CEM3340
*[[Oberheim DMX]] - 1 CEM3320, or CEM3350 depending upon the voice card
* Doepfer A-111-2 High End VCO II/VCLFO - CEM3340
*[[Oberheim Martix 6|Oberheim Martix 6 & 6R]] - 6 CEM3396 
* Doepfer A-111-3 Micro Precision VCO - CEM3340
*[[Oberheim Matrix 1000]] - 6 CEM3396 
* Doepfer A-111-4 Quad Precision VCO - CEM3340
*[[Oberheim OB-1]] - 2 CEM3310
* Doepfer A-111-5 Synthesizer Voice - CEM3394
*[[Oberheim OB8]] & [[Oberheim OBX-A|OBX-A]] - 16 CEM3310, 16 CEM3320, 16 CEM3340, 2 CEM3360
* Doepfer A-121 Multimode Filter - CEM3320
*[[Oberheim OB-SX]] - 2 CEM3310, 1 CEM3320, 2 CEM3340, 1 CEM3360
* Doepfer A-122 24dB Curtis Low Pass Filter - CEM3320, CEM3379 in later versions
*[[Oberheim Prommer]] - 1 CEM3328
* Doepfer A-123 24dB High Pass - CEM3320
*[[Oberheim Xpander]] - 6 CEM3372, 6 CEM3374
* Doepfer A-124 Wasp Filter - CEM3379
*[[Paia Proteus]] - 1 CEM3310, 1 CEM3320, 1 CEM3330, 2 CEM3340
* Doepfer A-126 Voltage Controlled Frequency Shifter - CEM3382
*[[Powertran Transcendent Polysynth]] - 2 CEM3310 per voice, 2 CEM3340 per voice
* Doepfer A-130 Voltage Controlled Amplifier - CEM3381 in earlier models, alternately CEM3382
*[[PPG Wave|PPG Wave 2.0]] - 4 CEM3310, 4 CEM3320
* Doepfer A-131 Voltage Controlled Amplifier - CEM3381 in earlier models, alternately CEM3382
*[[PPG Wave|PPG Wave, 2.2 and 2.3]] - 4 CEM3360
*[[Rhodes Chroma]] - 8 CEM3350, 8 CEM3360 (some versions have 9)
* Doepfer A-132-3 Dual linear/exponential VCA - CEM3360 (early versions)
* Doepfer A-134-1 Voltage Controlled Panner/Crossfader - CEM3381
*[[Rhodes Polaris]] - 6 CEM3372, 6 CEM3374
* Doepfer A-179 Light Controlled Voltage Source - CEM3320
*[[Roland Jupiter 6]] - 12 CEM3340, 6 CEM3360
* Doepfer Dark Energy - CEM3394 (original model)
*[[Roland Jupiter 8/MKS-80 serial #511800 up]] - 4 CEM3360
* Dynacord Add-one - 8 x CEM3389
*[[Roland Jupiter 8/MKS-80 to serial #511800]] - 8 CEM3340, 4 CEM3360
* [[EH-30 Modular]] – 2 x CEM3310, 4 x CEM3330, 4 x CEM3340
*[[Roland MKS-20]] - 5 CEM3360
* Elka Synthex – 8 x CEM3320
*[[Roland Roland SH101|Roland Roland SH101 & MC202]] - 1 CEM3340
* Elka EK-22 – 6 x CEM3396
*[[Sequential Circuits Drumtraks]] - 2 CEM3320
* Ensoniq ESQ-1 – 1 x CEM3360, 8 x CEM3379
*[[Sequential Circuits Max]] - 6 CEM3394
* Ensoniq ESQ-2 – 1 x CEM3360
*[[Sequential Circuits Pro-1]] - 2 CEM3310, 1 CEM3320, 3 CEM3340
* Ensoniq Mirage – 8 x CEM3328
*[[Sequential Circuits Prophet 10]] - 20 CEM3310, 10 CEM3320, 22 CEM3340
* Ensoniq SDP-1 - 10 x CEM3328
*[[Sequential Circuits Prophet 2000]] - CEM3379
* Ensoniq SQ-80 – 1 x CEM3360, 8 x CEM3379
*[[Sequential Circuits Prophet 3000]] - CEM3387
* Ensoniq SQ-81 – 1 x CEM3360
*[[Sequential Circuits Prophet 5 Rev 3]] - 10 CEM3310, 5 CEM3320, 11 CEM3340
* Fairlight CMI II – 8 x CEM3320, in earlier versions
*[[Sequential Circuits Prophet 600]] - 12 CEM3340, 4 CEM3360, 6 CEM3372
* Fender/Rhodes Chroma – 8 x CEM3350, 8 x CEM3360
*[[Sequential Circuits Six-Trax]] - CEM3372, 6 CEM3394
* Fender/Rhodes Polaris – 6 x CEM3372, 6 x CEM3374
*[[Sequential Circuits Split8]] - 8 CEM3394
* Forat F9000 – 4 x CEM3320
*[[Sequential Circuits Studio 440]] - 1 CEM3360, 8 CEM3389, 1 CEM5530
* Hyperflange + Chorus by Craig Anderton - 1 x CEM3340
*[[Sequential Circuits T8]] - 16 CEM3340, 8 CEM3372
* Hohner PK150 - 1 x CEM3391
*[[Sequential Circuits VS]] - 8 CEM3378, 8 CEM3382, 1 CEM5510, 1 CEM5530
* Hohner PK250 - 2 x CEM3391
*[[Simmons Drums SDS8]] - 5 CEM3372
* Keytek CTS-2000 – 8 x CEM3389, 1 x CEM5530
*[[Simmons Drums SDS800]] - 2 CEM3394
* Kurzweil K250 – 8 x CEM3335
*[[Simmons Drums SDS9, SDS1000]] - 3 CEM3394
* Linndrum – 2 x CEM3320, 1 x CEM3360
*[[Steiner EVI]] - CEM3340?
* Linn 9000 – 4 x CEM3320
*[[Synton Synrix]] - 2 CEM3310, 2 CEM3340, 2 CEM3350, 1 CEM3360
* Marion Systems MSR-2 - CEM3397
*[[Thomas Henry]]: Deluxe VCO - CEM3340<ref name="th">Build a better music synthesiser by Thomas Henry, Tab Books Inc, 1987, ISBN 0830627533</ref>
* Marion Systems MS9C - 8 3387
*Thomas Henry: A dual VCA - CEM3330<ref name="th"/>
* [[Moog Memorymoog]] – 12 x CEM3310, 19 x CEM3340, 26 x CEM3360
*[[Waldorf Microwave1 revision A]] - 8 CEM3389
* Mutronics Mutator
*[[Waldorf Microwave1 revision B]] - 8 CEM3387
* Oberheim DX – 3 x CEM3320
*[[Waldorf Wave]] - 16 CEM3387
* Oberheim DMX – 1 x CEM3320, or CEM3350 depending upon the voice card
<ref name="sch"/><ref name="cemci">Curtis Electromusic [http://curtiselectromusic.com/Customers_and_Instruments.html Customers and Instruments]</ref><ref name="sd">[http://www.sequencer.de/specials/synthesizer_chip.html Synthesizer Database] by Moogulator</ref><ref name="pp">[http://patchpierre.blogspot.co.uk/2012/02/cem-chips-in-doepfer-modules.html CEM chips in Doepfer Modules] by Pierre Serné, 28 Feb. 2012</ref><ref>[http://www.midibox.org/dokuwiki/doku.php?id=midibox_3396 MIDIbox 3396]</ref><ref>[http://www.digisound80.co.uk/digisound/modules/modules.htm Digisound 80 Synthesizer Modules]</ref>
* Oberheim Matrix 6 & 6R – 6 x CEM3396
* Oberheim Matrix 12 – 12 x CEM3374, 12 x CEM3372
* Oberheim Matrix 1000 – 6 x CEM3396
* [[Oberheim OB-1]] – 2 x CEM3310
* [[Oberheim OB-8]] – 16 x CEM3310, 16 x CEM3320, 16 x CEM3340, 2 x CEM3360
* Oberheim OB-SX – 2 x CEM3310, 1 x CEM3320, 2 x CEM3340, 1 x CEM3360 per voice
* Oberheim OB-X – 2 x CEM3310
* Oberheim OB-Xa – 16 x CEM3310, 8 x CEM3320, 16 x CEM3340, 2 x CEM3360
* Oberheim Prommer – 1 x CEM3328<!-- or 3320?-->
* Oberheim Xpander – 6 x CEM3372, 6 x CEM3374
* Octave Plateau Voyetra 8 – 16 x CEM3340
* Octave The Cat SRM II – CEM3340
* JLCooper Oberheim filter mod – per voice: 1 x CEM3320
* Polyfusion Series 2000 Synthesizer - 3340 revision D only, revision A and B are based on the μA726 and XR2207
* [[PPG Wave|PPG Wave 2.0]] – 4 x CEM3310, 4 x CEM3320
* [[PPG Wave|PPG Wave, 2.2 and 2.3]] – 4 x CEM3360
* Rhodes Chroma – 8 x CEM3350, 8 x CEM3360 (some versions have 9)
* Rhodes Polaris – 6 x CEM3372, 6 x CEM3374
* Roland Jupiter 6 – 12 x CEM3340, 6 x CEM3360
* Roland Jupiter 8/MKS-80 to serial #511799 (early models) – 8 x CEM3340, 4 x CEM3360
* Roland Jupiter 8/MKS-80 serial #511800 up (later models) – 4 x CEM3360
* Roland MKS-20 – 5 x CEM3360
* Roland Roland MC202 – 1 x CEM3340
* Roland Roland SH101 – 1 x CEM3340
* Sequential Circuits Drumtraks – 2 x CEM3320
* Sequential Circuits Max – 6 x CEM3394
* Sequential Circuits Multi-Trak – 6 x CEM3394
* Sequential Circuits Pro One – 2 x CEM3310, 1 x CEM3320, 3 x CEM3340
* Sequential Circuits Prophet 10 – 20 x CEM3310, 10 x CEM3320, 22 x CEM3340
* Sequential Circuits Prophet 2000 – 8 x CEM3379
* Sequential Circuits Prophet 3000 – CEM3387
* [[Sequential Circuits Prophet-5]], Rev 3 – 10 CEM3310, 5 x CEM3320, 11 x CEM3340
* Sequential Circuits Prophet 600 – 12 x CEM3340, 4 x CEM3360, 6 x CEM3372
* Sequential Circuits Six-Trax – 6 x CEM3394 - The [https://en.wikipedia.org/wiki/Sente_Technologies Bally/Sente SAC] was an OEM'd Six-Trax as confirmed by the PCB.<ref>[https://synth-diy.org/pipermail/synth-diy/2005-December/034037.html CEM/SSM Chips used in non-synths?], Synth-diy email list, Dec 2005</ref>
* Sequential Circuits Split8 – 8 x CEM3394
* Sequential Circuits Studio 440 – 1 x CEM3360, 8 x CEM3389, 1 x CEM5530
* Sequential Circuits T8 – 16 x CEM3340, 8 x CEM3372
* Sequential Circuits VS – 8 x CEM3378/3379, 4 x CEM3360, 2 x CEM3365, 4 x CEM5510, 2 x CEM5530
* Simmons SDS1000 – 3 x CEM3394
* Simmons SDS200 - 2 x CEM3394
* Simmons SDS400 - 4 x CEM3394
* Simmons SDS7 – – per module: 1 x CEM3340, 1 x CEM3372
* Simmons SDS8 – 5 x CEM3372
* Simmons SDS800 – 4 x CEM3394
* Simmons SDS9 – 1 x CEM3372, 3 x CEM3394
* Solton Programmer 24 - 1 x CEM3350
* Solton TS3 - 3 x CEM3360
* Solton TS4 - 1 x CEM3360
* Steiner EVI – 1 x CEM3340, 1 SSM2040
* Syntec Banana – 12 x CEM3310, 12 x CEM3340, 12 x CEM3360
* Synton Synrix – 2 x CEM3310, 2 x CEM3340, 2 x CEM3350, 1 x CEM3360
* Voyetra 8 - 16 x CEM3340
* Waldorf Microwave1 revision A – 8 x CEM3389
* Waldorf Microwave1 revision B – 8 x CEM3387
* Waldorf Wave – 16 x CEM3387

=== DIY projects ===
* [[Böhm Soundlab]] – CEM3310, CEM3320, CEM3330, CEM3340
* Deckard's Dream - 17 x CEM3340
* Digisound 80-10 – 1 x CEM3310
* Digisound 80-16 – 1 x CEM3350
* Digisound 80-18 – 1 x CEM3310
* Digisound 80-19 – 1 x CEM3360
* Digisound 80-2 – 1 x CEM3340
* Digisound 80-21 – 1 x CEM3340
* Digisound 80-3 – 1 x CEM3340
* Digisound 80-4 – 3 x CEM3330
* Digisound 80-6 – 1 x CEM3320
* Digisound 80-7A – 1 x CEM3320, 1 x CEM3335
* Digisound 80-9 – 1 x CEM3330
* Digisound 80-C9 – 2 x CEM3310, 2 x CEM3340, 1 x CEM3360, 1 x CEM3372
* Digisound 80 Dev-91 – 1 x CEM3391
* Dusk work Self-Tuning VCO - 1 x AS3340
* [[E&MM Spectrum Synthesizer]] – 2 x CEM3310, 1 x CEM3320, 2 x CEM3330, 2 x CEM3340
* [[Elektor new synthesiser]] - 2 x CEM3310, 1 x CEM3320, 2 x CEM3340
* [[Elektor polyphonic synthesiser]] - per voice: 2 x CEM3310, 1 x CEM3320, 1 or 2 x CEM3340
* [https://hbo-synthesizer-workbench.jimdofree.com/as3394-synthi/ HBO AS3394 Synthesizer] - 1 x CEM3394 per voice (up to six voices)
* Juergen Haible Dual VCO - 2 x CEM3340
* Kijimi - 16 x AS3340, 24 x CEM3360
* MIDIbox 3396 – CEM3396
* PAiA 6750 Hyperflange & Chorus, 1 x CEM3340
* [[PAiA Proteus 1]] – 1 x CEM3310, 1 x CEM3320, 1 x CEM3330, 2 x CEM3340
* PAIA EKx-40 VCO - 1 x CEM3340
* [[Powertran Transcendent polysynth]] - per voice: 2 x CEM3310, 2 x CEM3340
* Thomas Henry Deluxe VCO – CEM3340<ref name="th">Build a better music synthesiser by Thomas Henry, Tab Books Inc, 1987, {{ISBN|0830627553}}</ref>
* Thomas Henry: A dual VCA – CEM3330<ref name="th" />
<ref name="sch" /><ref name="cemci">Curtis Electromusic [https://web.archive.org/web/20130502132536/http://curtiselectromusic.com/Customers_and_Instruments.html Customers and Instruments]</ref><ref name="sd">[http://www.sequencer.de/specials/synthesizer_chip.html Synthesizer Database] by Moogulator</ref><ref name="pp">[http://patchpierre.blogspot.co.uk/2012/02/cem-chips-in-doepfer-modules.html CEM chips in Doepfer Modules] by Pierre Serné, 28 Feb. 2012</ref><ref>[http://www.midibox.org/dokuwiki/doku.php?id=midibox_3396 MIDIbox 3396]</ref><ref>[http://www.digisound80.co.uk/digisound/modules/modules.htm Digisound 80 Synthesizer Modules]</ref><ref>Wikipedia:[https://en.wikipedia.org/wiki/CEM_and_SSM_chips_in_synthesizers CEM and SSM chips in synthesizers]</ref>


== See also ==
== See also ==
*[[Solid State Micro Technology For Music]]
* [[Solid State Micro Technology for Music]]
* [[Alfa Rpar AS]]


== References ==
== References ==
{{reflist}}
{{reflist}}

== Further reading ==
* ''[https://archive.org/details/ElektorMagazine/Elektor%5Bnonlinear.ir%5D%201981-10/page/n19/mode/1up Synthesiser IC's]'' by H. P. Baumann, Elektor 078, Oct 1981, pp. 10-18
* ''Electronic Music Circuits'' by Barry Klein, Howard Sams, 1982, {{ISBN|067221833X}}


== External links ==
== External links ==
*[http://curtiselectromusic.com/ Curtis Electromusic]
* [https://web.archive.org/web/20080124170117/http://curtiselectromusic.com/ Curtis Electromusic] - archived
* [http://www.alfarzpp.lv/eng/sc/application.php Alfa application specific ICs]
*[http://retrosynthads.blogspot.co.uk/2011/07/curtis-electromusic-specialties-what.html What a Difference a Chip Makes] a quarter page advertisement in Contemporary Keyboard, February 1980
* [http://retrosynthads.blogspot.co.uk/2011/07/curtis-electromusic-specialties-what.html What a Difference a Chip Makes] a quarter page advertisement in Contemporary Keyboard, February 1980
* [http://synth.stromeko.net/DIY.html#CEMpics Pictures of dead CEM chips] at Stromeko Synth World
* [http://www.aes.org/e-lib/browse.cfm?elib=2639 A Monolithic Voltage-Controlled Amplifier Employing Log-Antilog Techniques], by Douglas R Curtis, JAES Volume 24 Issue 2 pp. 93-102, March 1976
* [http://ssmcurtis.com/ Synth's Inside Out]
* About the CEM3340 - [http://www.muzines.co.uk/articles/ics-for-electro-music/2561 ICs for Electro-Music (Part 1)] by Charles Blakey, Electronics & Music Maker, March 1981
* About the CEM3320, CEM3330 and CEM3310 - [http://www.muzines.co.uk/articles/ics-for-electro-music/2596 ICs for Electro-Music (Part 2)] by Charles Blakey, Electronics & Music Maker, April 1981
* [https://gearspace.com/board/electronic-music-instruments-and-electronic-music-production/1016749-cem-curtis-love-thread.html CEM (Curtis) Love Thread], Gearspace.com, Jul 2015


===Data sheets===
== YouTube ==
* [https://youtu.be/rslPZYUMQMw New vs. old Curtis CEM3340 rev G comparison]
Data sheets are freely available from:
=== Data sheets ===
;[http://www.cem3374.com/datasheets.htm CEM3374.com]
[https://sdiy.info/wiki/File:CEM3310_datasheet.pdf CEM3310], [https://sdiy.info/wiki/File:CEM3310_datasheet_long.pdf CEM3310 long],[https://sdiy.info/wiki/File:CEM3312_datasheet.pdf CEM3312], [https://sdiy.info/wiki/File:CEM3320_datasheet.pdf CEM3320], [https://sdiy.info/wiki/File:CEM3320_datasheet_long.pdf CEM3320 long], [https://sdiy.info/wiki/File:CEM3328_datasheet.pdf CEM3328], [https://sdiy.info/wiki/File:CEM3330_datasheet.pdf CEM3330], [https://sdiy.info/wiki/File:CEM3330-3335_long.pdf CEM_3330-3335 long], [https://sdiy.info/wiki/File:CEM3340_datasheet.pdf CEM3340], [https://sdiy.info/wiki/File:CEM3340-3345_long.pdf CEM_3340-3345 long], [https://sdiy.info/wiki/File:CEM3350_datasheet.pdf CEM3350], [https://sdiy.info/wiki/File:CEM3360_datasheet.pdf CEM3360], [https://sdiy.info/wiki/File:CEM3365_datasheet.pdf CEM3365], [https://sdiy.info/wiki/File:CEM3371_datasheet.pdf CEM3371], [https://sdiy.info/wiki/File:CEM3372_datasheet.pdf CEM3372], [https://sdiy.info/wiki/File:CEM3374_datasheet.pdf CEM3374], [https://sdiy.info/wiki/File:CEM3378_datasheet.pdf CEM3378], [https://sdiy.info/wiki/File:CEM3381_datasheet.pdf CEM3381], [https://sdiy.info/wiki/File:CEM3389_datasheet.pdf CEM3389], [https://sdiy.info/wiki/File:CEM3391_datasheet.pdf CEM3391], [https://sdiy.info/wiki/File:CEM3394_datasheet.pdf CEM3394], [https://sdiy.info/wiki/File:CEM3396_datasheet.pdf CEM3396], [https://sdiy.info/wiki/File:CEM5508_datasheet.pdf CEM5508], [https://sdiy.info/wiki/File:CEM5530_datasheet.pdf CEM5530]
:CEM3310, CEM3312, CEM3320, CEM3328, CEM3330, CEM3340, CEM3350, CEM3360, CEM3365, CEM3371, CEM3372, CEM3374, CEM3378, CEM3381, CEM3389, CEM3391, CEM3394, CEM3396, CEM5508, CEM5530
<br/>Some are also freely available from [http://www.synfo.nl/pages/datasheets.html Synfo.nl]


[[Category:Analog integrated circuits]]
[[Category:Linear ICs]]
[[Category:Manufacturers]]
[[Category:American brands]]
[[Category:CEM ICs]]
[[Category:CEM ICs]]

Latest revision as of 09:18, 29 June 2024

OnChip Systems formerly known as Curtis Electromusic Specialities.

The company

After working for four years at Interdesign, Inc. Doug Curtis went on to found Curtis Electromusic Specialties in 1979.[1] He did this specifically to design and manufacture integrated circuits for music synthesizers. Curtis Electromusic Specialties manufacturered a wide variety of ICs, many of which incorporated an entire synthesizer functional component, for example, the CEM3340, which contained a complete voltage controlled oscillator. By using chips from Curtis (and its competitor, SSM), synth manufacturers were able to considerably reduce the size of their circuitry. This (along with the advent of inexpensive microprocessor control) is what led to the wave of polyphonic analog synthesizers in the 1980s. By using the Curtis and SSM chips, manufacturers were able to shrink the size of their circuitry to where it could all fit in a package no larger than what was necessary to also house a keyboard and control panel.[2]

Later developments included more highly integrated circuits such as the 3389 signal processor and the 3396 synth-on-a-chip. The further miniaturaization led to the creation of rackmount synthesizers, played via MIDI from a master keyboard, and saving performers both money and space.[2][3]

OnChip Systems

In 1988 with the advent of digital technology and software, Doug Curtis broadened his focus beyond synthesizers forming OnChip Systems and did no further design work on music synthesis products, except for occasional consulting for synth manufacturers until his premature death in 2007. Several more patents in his name are assigned for chips designed into various commercial products.[2][4][5]

In 2016 OnChip Systems re-released the 3340, in response to Coolaudio's V3340 re-design of the part to the same specifications.[6][7]

Clones

Alfa Rpar AS produces the AS33xx equivalent ICs in DIP and SMT packages.

The designs

CEM ICs have part numbers of the form "33nn", and synth designers and techs often speak these part numbers without further attribution.[2] De-encapsulated (defective) CEM ICs are obviously bipolar arrays, although Interdesign or Ferranti die marks are missing. They exactly match the 1980 databook 201 Analog IC Designs from Interdesign.[1]

CEM ICs

[8][9][10][11]

Synthesizers using CEM ICs

Prebuilt

  • Akai AX-60 – 6 x CEM3394
  • Akai AX-80 – 6 x CEM3372
  • Akai VX600 - 12 x CEM3374B, 12 x CEM3378
  • Behringer Crave - 1 x CEM3340
  • Behringer Neutron - 2 x CEM3340
  • Buchla 296e – 1 x CEM3360
  • Cheetah MS6 – 6 x CEM3396
  • Crumar Bit 99 – 6 x CEM3328
  • Crumar Bit One – 6 x CEM3328 in late models
  • Crumar Composer – 2 x CEM3310, 2 x CEM3320, 2 x CEM3330
  • Crumar Spirit – 2 x CEM3340, 2 x CEM3350, 3 x CEM3360
  • Crumar Stratus – 6 x CEM3310, 6 x CEM3320, 6 x CEM3330
  • Crumar Trilogy – 6 x CEM3310, 6 x CEM3320, 6 x CEM3330
  • Doepfer A-106-6 XP Filter - CEM3379
  • Doepfer A-107 Multitype Morphing Filter - CEM3379
  • Doepfer A-109 Voltage Controlled Signal Processor - CEM3379
  • Doepfer A-111-1 High-End VCO - CEM3340
  • Doepfer A-111-2 High End VCO II/VCLFO - CEM3340
  • Doepfer A-111-3 Micro Precision VCO - CEM3340
  • Doepfer A-111-4 Quad Precision VCO - CEM3340
  • Doepfer A-111-5 Synthesizer Voice - CEM3394
  • Doepfer A-121 Multimode Filter - CEM3320
  • Doepfer A-122 24dB Curtis Low Pass Filter - CEM3320, CEM3379 in later versions
  • Doepfer A-123 24dB High Pass - CEM3320
  • Doepfer A-124 Wasp Filter - CEM3379
  • Doepfer A-126 Voltage Controlled Frequency Shifter - CEM3382
  • Doepfer A-130 Voltage Controlled Amplifier - CEM3381 in earlier models, alternately CEM3382
  • Doepfer A-131 Voltage Controlled Amplifier - CEM3381 in earlier models, alternately CEM3382
  • Doepfer A-132-3 Dual linear/exponential VCA - CEM3360 (early versions)
  • Doepfer A-134-1 Voltage Controlled Panner/Crossfader - CEM3381
  • Doepfer A-179 Light Controlled Voltage Source - CEM3320
  • Doepfer Dark Energy - CEM3394 (original model)
  • Dynacord Add-one - 8 x CEM3389
  • EH-30 Modular – 2 x CEM3310, 4 x CEM3330, 4 x CEM3340
  • Elka Synthex – 8 x CEM3320
  • Elka EK-22 – 6 x CEM3396
  • Ensoniq ESQ-1 – 1 x CEM3360, 8 x CEM3379
  • Ensoniq ESQ-2 – 1 x CEM3360
  • Ensoniq Mirage – 8 x CEM3328
  • Ensoniq SDP-1 - 10 x CEM3328
  • Ensoniq SQ-80 – 1 x CEM3360, 8 x CEM3379
  • Ensoniq SQ-81 – 1 x CEM3360
  • Fairlight CMI II – 8 x CEM3320, in earlier versions
  • Fender/Rhodes Chroma – 8 x CEM3350, 8 x CEM3360
  • Fender/Rhodes Polaris – 6 x CEM3372, 6 x CEM3374
  • Forat F9000 – 4 x CEM3320
  • Hyperflange + Chorus by Craig Anderton - 1 x CEM3340
  • Hohner PK150 - 1 x CEM3391
  • Hohner PK250 - 2 x CEM3391
  • Keytek CTS-2000 – 8 x CEM3389, 1 x CEM5530
  • Kurzweil K250 – 8 x CEM3335
  • Linndrum – 2 x CEM3320, 1 x CEM3360
  • Linn 9000 – 4 x CEM3320
  • Marion Systems MSR-2 - CEM3397
  • Marion Systems MS9C - 8 3387
  • Moog Memorymoog – 12 x CEM3310, 19 x CEM3340, 26 x CEM3360
  • Mutronics Mutator
  • Oberheim DX – 3 x CEM3320
  • Oberheim DMX – 1 x CEM3320, or CEM3350 depending upon the voice card
  • Oberheim Matrix 6 & 6R – 6 x CEM3396
  • Oberheim Matrix 12 – 12 x CEM3374, 12 x CEM3372
  • Oberheim Matrix 1000 – 6 x CEM3396
  • Oberheim OB-1 – 2 x CEM3310
  • Oberheim OB-8 – 16 x CEM3310, 16 x CEM3320, 16 x CEM3340, 2 x CEM3360
  • Oberheim OB-SX – 2 x CEM3310, 1 x CEM3320, 2 x CEM3340, 1 x CEM3360 per voice
  • Oberheim OB-X – 2 x CEM3310
  • Oberheim OB-Xa – 16 x CEM3310, 8 x CEM3320, 16 x CEM3340, 2 x CEM3360
  • Oberheim Prommer – 1 x CEM3328
  • Oberheim Xpander – 6 x CEM3372, 6 x CEM3374
  • Octave Plateau Voyetra 8 – 16 x CEM3340
  • Octave The Cat SRM II – CEM3340
  • JLCooper Oberheim filter mod – per voice: 1 x CEM3320
  • Polyfusion Series 2000 Synthesizer - 3340 revision D only, revision A and B are based on the μA726 and XR2207
  • PPG Wave 2.0 – 4 x CEM3310, 4 x CEM3320
  • PPG Wave, 2.2 and 2.3 – 4 x CEM3360
  • Rhodes Chroma – 8 x CEM3350, 8 x CEM3360 (some versions have 9)
  • Rhodes Polaris – 6 x CEM3372, 6 x CEM3374
  • Roland Jupiter 6 – 12 x CEM3340, 6 x CEM3360
  • Roland Jupiter 8/MKS-80 to serial #511799 (early models) – 8 x CEM3340, 4 x CEM3360
  • Roland Jupiter 8/MKS-80 serial #511800 up (later models) – 4 x CEM3360
  • Roland MKS-20 – 5 x CEM3360
  • Roland Roland MC202 – 1 x CEM3340
  • Roland Roland SH101 – 1 x CEM3340
  • Sequential Circuits Drumtraks – 2 x CEM3320
  • Sequential Circuits Max – 6 x CEM3394
  • Sequential Circuits Multi-Trak – 6 x CEM3394
  • Sequential Circuits Pro One – 2 x CEM3310, 1 x CEM3320, 3 x CEM3340
  • Sequential Circuits Prophet 10 – 20 x CEM3310, 10 x CEM3320, 22 x CEM3340
  • Sequential Circuits Prophet 2000 – 8 x CEM3379
  • Sequential Circuits Prophet 3000 – CEM3387
  • Sequential Circuits Prophet-5, Rev 3 – 10 CEM3310, 5 x CEM3320, 11 x CEM3340
  • Sequential Circuits Prophet 600 – 12 x CEM3340, 4 x CEM3360, 6 x CEM3372
  • Sequential Circuits Six-Trax – 6 x CEM3394 - The Bally/Sente SAC was an OEM'd Six-Trax as confirmed by the PCB.[12]
  • Sequential Circuits Split8 – 8 x CEM3394
  • Sequential Circuits Studio 440 – 1 x CEM3360, 8 x CEM3389, 1 x CEM5530
  • Sequential Circuits T8 – 16 x CEM3340, 8 x CEM3372
  • Sequential Circuits VS – 8 x CEM3378/3379, 4 x CEM3360, 2 x CEM3365, 4 x CEM5510, 2 x CEM5530
  • Simmons SDS1000 – 3 x CEM3394
  • Simmons SDS200 - 2 x CEM3394
  • Simmons SDS400 - 4 x CEM3394
  • Simmons SDS7 – – per module: 1 x CEM3340, 1 x CEM3372
  • Simmons SDS8 – 5 x CEM3372
  • Simmons SDS800 – 4 x CEM3394
  • Simmons SDS9 – 1 x CEM3372, 3 x CEM3394
  • Solton Programmer 24 - 1 x CEM3350
  • Solton TS3 - 3 x CEM3360
  • Solton TS4 - 1 x CEM3360
  • Steiner EVI – 1 x CEM3340, 1 SSM2040
  • Syntec Banana – 12 x CEM3310, 12 x CEM3340, 12 x CEM3360
  • Synton Synrix – 2 x CEM3310, 2 x CEM3340, 2 x CEM3350, 1 x CEM3360
  • Voyetra 8 - 16 x CEM3340
  • Waldorf Microwave1 revision A – 8 x CEM3389
  • Waldorf Microwave1 revision B – 8 x CEM3387
  • Waldorf Wave – 16 x CEM3387

DIY projects

  • Böhm Soundlab – CEM3310, CEM3320, CEM3330, CEM3340
  • Deckard's Dream - 17 x CEM3340
  • Digisound 80-10 – 1 x CEM3310
  • Digisound 80-16 – 1 x CEM3350
  • Digisound 80-18 – 1 x CEM3310
  • Digisound 80-19 – 1 x CEM3360
  • Digisound 80-2 – 1 x CEM3340
  • Digisound 80-21 – 1 x CEM3340
  • Digisound 80-3 – 1 x CEM3340
  • Digisound 80-4 – 3 x CEM3330
  • Digisound 80-6 – 1 x CEM3320
  • Digisound 80-7A – 1 x CEM3320, 1 x CEM3335
  • Digisound 80-9 – 1 x CEM3330
  • Digisound 80-C9 – 2 x CEM3310, 2 x CEM3340, 1 x CEM3360, 1 x CEM3372
  • Digisound 80 Dev-91 – 1 x CEM3391
  • Dusk work Self-Tuning VCO - 1 x AS3340
  • E&MM Spectrum Synthesizer – 2 x CEM3310, 1 x CEM3320, 2 x CEM3330, 2 x CEM3340
  • Elektor new synthesiser - 2 x CEM3310, 1 x CEM3320, 2 x CEM3340
  • Elektor polyphonic synthesiser - per voice: 2 x CEM3310, 1 x CEM3320, 1 or 2 x CEM3340
  • HBO AS3394 Synthesizer - 1 x CEM3394 per voice (up to six voices)
  • Juergen Haible Dual VCO - 2 x CEM3340
  • Kijimi - 16 x AS3340, 24 x CEM3360
  • MIDIbox 3396 – CEM3396
  • PAiA 6750 Hyperflange & Chorus, 1 x CEM3340
  • PAiA Proteus 1 – 1 x CEM3310, 1 x CEM3320, 1 x CEM3330, 2 x CEM3340
  • PAIA EKx-40 VCO - 1 x CEM3340
  • Powertran Transcendent polysynth - per voice: 2 x CEM3310, 2 x CEM3340
  • Thomas Henry Deluxe VCO – CEM3340[13]
  • Thomas Henry: A dual VCA – CEM3330[13]

[9][14][15][16][17][18][19]

See also

References

  1. ^ a b Pictures of dead CEM chips at Stromeko Synth World
  2. ^ a b c d Curtis Electromusic, Electronic Music wiki
  3. ^ About the Company, Curtis Electromusic
  4. ^ Doug Curtis, Curtis Electromusic
  5. ^ About the Company, Curtis Electromusic
  6. ^ Curtis Electromusic Specialties, Facebook, 5 June 2016
  7. ^ Curtis Family Speaks Out Against Behringer Synth Clone Plans Using CEM3340 by Rounik Sethi, Ask.Audio, 21 Mar 2017
  8. ^ CEM data sheets
  9. ^ a b Various schematics
  10. ^ Curtis Electromusic Product Overview
  11. ^ What chip do I have in my synth? at www.synthtech.com
  12. ^ CEM/SSM Chips used in non-synths?, Synth-diy email list, Dec 2005
  13. ^ a b Build a better music synthesiser by Thomas Henry, Tab Books Inc, 1987, ISBN 0830627553
  14. ^ Curtis Electromusic Customers and Instruments
  15. ^ Synthesizer Database by Moogulator
  16. ^ CEM chips in Doepfer Modules by Pierre Serné, 28 Feb. 2012
  17. ^ MIDIbox 3396
  18. ^ Digisound 80 Synthesizer Modules
  19. ^ Wikipedia:CEM and SSM chips in synthesizers

Further reading

  • Synthesiser IC's by H. P. Baumann, Elektor 078, Oct 1981, pp. 10-18
  • Electronic Music Circuits by Barry Klein, Howard Sams, 1982, ISBN 067221833X

External links

YouTube

Data sheets

CEM3310, CEM3310 long,CEM3312, CEM3320, CEM3320 long, CEM3328, CEM3330, CEM_3330-3335 long, CEM3340, CEM_3340-3345 long, CEM3350, CEM3360, CEM3365, CEM3371, CEM3372, CEM3374, CEM3378, CEM3381, CEM3389, CEM3391, CEM3394, CEM3396, CEM5508, CEM5530
Some are also freely available from Synfo.nl

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