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Most '''Curtis Electromusic Specialities''' or '''CEM''' [[Integrated circuit|ICICs]]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 ==
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 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" />
 
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" />
 
Although the company still maintains a web page, it is no longer doing business.<ref name="emwcem" />
 
== The designs ==
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" />
 
== CEM ICs ==
* [[CEM 3310]] -– [[Envelope generator|Voltage Controlled Envelope Generator]]
* [[CEM 3320]] -– [[Voltage Controlled Filter]]
* [[CEM 3328]] -– Dual [[Voltage Controlled Amplifier]]
* [[CEM 3330]] -– Dual Voltage Controlled Amplifier
* [[CEM 3335]] -– Dual Voltage Controlled Amplifier
* [[CEM 3340]] -– [[Voltage Controlled Oscillator]]
* [[CEM 3345]] -– Voltage Controlled Oscillator
* [[CEM 3350]] -– Dual VC State Variable Filter
* [[CEM 3360]] -– Dual VCA
* [[CEM 3365]] -– Fast Dual [[DAC]] Multiplier
* [[CEM 3372]] - µP Controllable Signal Processor
* [[CEM 3374]] -– Dual VCO
* [[CEM 3378]] -– Voltage Controlled Signal Processor, (two-channel [[voltage controlled mixer]], four-pole low-pass VCF, and VCA)
* [[CEM 3379]] -– Voltage Controlled Signal Processor, (two-channel voltage controlled output pan, four-pole low-pass VCF, and VCA)
* [[CEM 3381]] -– Dual Low Rise VCA
* [[CEM 3382]] -– Dual Low Rise VCA
* [[CEM 3385]] -– Dual Low Noise VCF
* [[CEM 3387]] -– Low Noise voltage controlled Signal Processor
* [[CEM 3389]] -– Voltage Controlled Signal Processor
* [[CEM 3391]] - µP Controllable Dynamic Signal Processor
* [[CEM 3394]] - µP Controllable [[synthesizer voice]]
* [[CEM 3396]] - µP Controlled [[Waveshaper]]/Filter
* [[CEM 5310]] -– Hex [[ADSR]] and VCA
* [[CEM 5315]] -– Quant ADSR and [[Octave Divider]]
* [[CEM 5508]] -– Octal [[Sample & Hold]]
* [[CEM 5512]] -– Octal Double Buffered Sample & Hold
* [[CEM 5510]] -– Fast Octal Sample & Hold, custom-made for Sequential Circuits
* [[CEM 5530]] -– 30 Channel Sample & Hold, custom-made for Sequential Circuits
* [[CEM 5570]] -– [[Bus]] Controlled Signal Processor
<ref name="cemds">CEM data sheets</ref><ref name="sch">Various schematics</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>
 
== Synthesizers using CEM ICs ==
* [[Akai AX-60]] -– 6 CEM 3394
* [[Akai VX600]] - 6 CEM 3374B, 1 CEM 3378, 9 SSM 2300
* [[Akai AX-80]] -– 6 CEM 3372
* [[Böhm Soundlab]] -– CEM 3310, CEM 3320, CEM 3330, CEM 3340
* [[Buchla 296e]] -– 1 CEM 3360
* [[Cheetah MS6]] -– 6 CEM 3396 
* [[Crumar Bit 01]] -– 6 CEM 3328 in late models
* [[Crumar Composer]] -– 2 CEM 3310, 2 CEM 3320, 2 CEM 3330
* [[Crumar Spirit]] -– 2 CEM 3340, 2 CEM 3350, 3 CEM 3360
* [[Stratus]] -– 6 CEM3310, 6 CEM3320, 6 CEM3330
* [[Crumar Trilogy]] -– 6 CEM 3310, 6 CEM 3320, 6 CEM 3330
* [[Digisound 80-10]] -– 1 CEM 3310
* [[Digisound 80-16]] -– 1 CEM 3350
* [[Digisound 80-18]] -– 1 CEM 3310
* [[Digisound 80-19]] -– 1 CEM 3360
* [[Digisound 80-2]] -– 1 CEM 3340
* [[Digisound 80-21]] -– 1 CEM 3340
* [[Digisound 80-3]] -– 1 CEM 3340
* [[Digisound 80-4]] -– 3 CEM 3330
* [[Digisound 80-6]] -– 1 CEM 3320
* [[Digisound 80-7]] -– 1 CEM 3320, 1 CEM 3335
* [[Digisound 80-9]] -– 1 CEM 3330
* [[Digisound 80-C9]] -– 2 CEM 3310, 2 CEM 3340, 1 CEM 3360, 1 CEM 3372
* [[Digisound 80 Dev-91]] -– 1 CEM 3391
* [[Doepfer A-106-6]] -– CEM 3379
* [[Doepfer A-107]] -– CEM 3379
* [[Doepfer A-109 ]] -– CEM 3379
* [[Doepfer A-111-1]] -– CEM 3340
* [[Doepfer A-111-2]] -– CEM 3394?
* [[Doepfer A-111-5]] -– CEM 3394
* [[Doepfer A-121 ]] -– CEM 3320
* [[Doepfer A-122]] -– CEM 3320, CEM 3379 in newer versions
* [[Doepfer A-123 ]] -– CEM 3320
* [[Doepfer A-124]] -– CEM 3379
* [[Doepfer A-126]] -– CEM 3382
* [[Doepfer A-130]] -– CEM 3381 in earlier models, alternately CEM 3382
* [[Doepfer A-131]] -– CEM 3381 in earlier models, alternately CEM 3382
* [[Doepfer A-132-3 ]] -– CEM 3360
* [[Doepfer A-134]] -– CEM 3381
* [[Doepfer A-179]] -– CEM 3320
* [[Doepfer Dark Energy]] -– CEM 3394 (original model only)
* [[E&MM Spectrum Synthesizer]] -– 2 CEM 3310, 1 CEM 3320, 2 CEM 3330, 3 CEM 3340
* [[EH-30 Modular]] -– 2 CEM 3310, 4 CEM 3330, 4 CEM 3340
* [[Elka Synthex]] -– 8 CEM 3320
* [[Elka EK-22]] -– 6 CEM3396
* [[Ensoniq ESQ1]] -– 1 CEM 3360, 8 CEM 3379
* [[Ensoniq ESQ2]] -– 1 CEM 3360
* [[Ensoniq Mirage]] -– 8 CEM 3328
* [[Ensoniq SQ-80]] -– 1 CEM 3360, 8 CEM 3379
* [[Ensoniq SQ-81]] -– 1 CEM 3360
* [[Fairlight CMI II]] -– 8 CEM 3320, in earlier versions
* [[Fender/Rhodes Chroma]] -– 8 CEM 3350, 8 CEM 3360
* [[Fender/Rhodes Polaris]] -– 6 CEM 3372, 6 CEM 3374
* [[Forat F9000]] -– 4 CEM 3320
* [[Keytek CTS-2000]] -– 8 CEM 3389, 1 CEM 5530
* [[Kurzweil K250]] -– 8 CEM 3335
* [[Linndrum]] -– 2 CEM 3320, 1 CEM 3360
* [[Linn 9000]] -– 4 CEM 3320
* [[MIDIbox 3396]] -– CEM 3396 
* [[Moog Memorymoog]] -– 12 CEM 3310, 19 CEM 3340, 26 CEM 3360
* [[Mutronics Mutator]]
* [[Oberheim DX]] -– 3 CEM 3328
* [[Oberheim DMX]] -– 1 CEM 3320, or CEM 3350 depending upon the voice card
* [[Oberheim Martix 6|Oberheim Martix 6 & 6R]] -– 6 CEM 3396 
* [[Oberheim Matrix 12]] -– 12 CEM 3374, 12 CEM 3372
* [[Oberheim Matrix 1000]] -– 6 CEM 3396 
* [[Oberheim OB-1]] -– 2 CEM 3310
* [[Oberheim OB-8]] -– 16 CEM 3310, 16 CEM 3320, 16 CEM 3340, 2 CEM 3360
* [[Oberheim OB-SX]] -– 2 CEM 3310, 1 CEM 3320, 2 CEM 3340, 1 CEM 3360 per [[voice]]
* [[Oberheim OB-X]] -– 2 CEM 3310
* [[Oberheim OB-Xa]] -– 16 CEM 3310, 8 CEM 3320, 16 CEM 3340, 2 CEM 3360
* [[Oberheim Prommer]] -– 1 CEM 3328
* [[Oberheim Xpander]] -– 6 CEM 3372, 6 CEM 3374
* [[Octave Plateau Voyetra 8]] -– 16 CEM 3340 VCO
* [[JLCooper filter mod|Oberheim JLCooper filter mod]] -– 1 CEM 3320 per voice
* [[Paia Proteus]] -– 1 CEM 3310, 1 CEM 3320, 1 CEM 3330, 2 CEM 3340
* [[Powertran Transcendent Polysynth]] -– 2 CEM 3310 per voice, 2 CEM 3340 per voice
* [[PPG Wave|PPG Wave 2.0]] -– 4 CEM 3310, 4 CEM 3320
* [[PPG Wave|PPG Wave, 2.2 and 2.3]] -– 4 CEM 3360
* [[Rhodes Chroma]] -– 8 CEM 3350, 8 CEM 3360 (some versions have 9)
* [[Rhodes Polaris]] -– 6 CEM 3372, 6 CEM 3374
* [[Roland Jupiter 6]] -– 12 CEM 3340, 6 CEM 3360
* [[Roland Jupiter 8|Roland Jupiter 8/MKS-80]] to serial #511799 (early models) -– 8 CEM 3340, 4 CEM 3360
* Roland Jupiter 8/MKS-80 serial #511800 up (later models) -– 4 CEM 3360
* [[Roland MKS-20]] -– 5 CEM 3360
* [[Roland Roland MC202|Roland Roland MC202]] -– 1 CEM 3340
* [[Roland Roland SH101|Roland Roland SH101]] -– 1 CEM 3340
* [[Sequential Circuits Drumtraks]] -– 2 CEM 3320
* [[Sequential Circuits Max]] -– 6 CEM 3394
* [[Sequential Circuits Multi-Trak]] -– 6 CEM 3394
* [[Sequential Circuits Pro One]] -– 2 CEM 3310, 1 CEM 3320, 3 CEM 3340
* [[Sequential Circuits Prophet 10]] -– 20 CEM 3310, 10 CEM 3320, 22 CEM 3340
* [[Sequential Circuits Prophet 2000]] -– CEM 3379
* [[Sequential Circuits Prophet 3000]] -– CEM 3387
* [[Sequential Circuits Prophet 5 Rev 3]] -– 10 CEM 3310, 5 CEM 3320, 11 CEM 3340
* [[Sequential Circuits Prophet 600]] -– 12 CEM 3340, 4 CEM 3360, 6 CEM 3372
* [[Sequential Circuits Six-Trax]] -– 6 CEM 3394
* [[Sequential Circuits Split8]] -– 8 CEM 3394
* [[Sequential Circuits Studio 440]] -– 1 CEM 3360, 8 CEM 3389, 1 CEM 5530
* [[Sequential Circuits T8]] -– 16 CEM 3340, 8 CEM 3372
* [[Sequential Circuits VS]] -– 8 CEM 3378/3379, 4 CEM 3360, 2 CEM 3365, 4 CEM 5510, 2 CEM 5530
* [[Simmons SDS7]] -– 1 CEM 3340 per module, 1 CEM 3372 per module
* [[Simmons SDS8]] -– 5 CEM 3372
* [[Simmons SDS800]] -– 4 CEM 3394
* [[Simmons SDS9, SDS1000]] -– 3 CEM 3394
* [[Solton Programmer 24]] 1 CEM 3350, 1 SSM 2044
* [[Steiner EVI]] -– CEM 3340?
* [[Syntec Banana]] -– 12 CEM 3310, 12 CEM 3340, 12 CEM 3360
* [[Synton Synrix]] -– 2 CEM 3310, 2 CEM 3340, 2 CEM 3350, 1 CEM 3360
* [[Thomas Henry]]: Deluxe VCO -– CEM 3340<ref name="th">Build a better music synthesiser by Thomas Henry, Tab Books Inc, 1987, ISBN 08306275330-8306-2753-3</ref>
* Thomas Henry: A dual VCA -– CEM 3330<ref name="th" />
* [[Waldorf Microwave1 revision A]] -– 8 CEM 3389
* [[Waldorf Microwave1 revision B]] -– 8 CEM 3387
* [[Waldorf Wave]] -– 16 CEM 3387
<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><ref>Wikipedia:[https://en.wikipedia.org/wiki/CEM_and_SSM_chips_in_synthesizers CEM and SSM chips in synthesizers]</ref>
 
== See also ==
* [[Solid State Micro Technology For Music]]
 
== References ==
Line 167:
 
== External links ==
* [http://curtiselectromusic.com/ Curtis Electromusic]
* [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/ SSM &amp; Curtis Chips &#8211;– Inside out]
 
=== Data sheets ===
[http://www.sdiy.info/w/images/CEM3310_datasheet.pdf CEM 3310], [http://www.sdiy.info/w/images/CEM3312_datasheet.pdf CEM 3312], [http://www.sdiy.info/w/images/CEM3320_datasheet.pdf CEM 3320], [http://www.sdiy.info/w/images/CEM3328_datasheet.pdf CEM 3328], [http://www.sdiy.info/w/images/CEM3330_datasheet.pdf CEM 3330], [http://www.sdiy.info/w/images/CEM3340_datasheet.pdf CEM 3340], [http://www.sdiy.info/w/images/CEM3350_datasheet.pdf CEM 3350], [http://www.sdiy.info/w/images/CEM3360_datasheet.pdf CEM 3360], [http://www.sdiy.info/w/images/CEM3365_datasheet.pdf CEM 3365], [http://www.sdiy.info/w/images/CEM3371_datasheet.pdf CEM 3371], [http://www.sdiy.info/w/images/CEM3372_datasheet.pdf CEM 3372], [http://www.sdiy.info/w/images/CEM3374_datasheet.pdf CEM 3374], [http://www.sdiy.info/w/images/CEM3378_datasheet.pdf CEM 3378], [http://www.sdiy.info/w/images/CEM3381_datasheet.pdf CEM 3381], [http://www.sdiy.info/w/images/CEM3389_datasheet.pdf CEM 3389], [http://www.sdiy.info/w/images/CEM3391_datasheet.pdf CEM 3391], [http://www.sdiy.info/w/images/CEM3394_datasheet.pdf CEM 3394], [http://www.sdiy.info/w/images/CEM3396_datasheet.pdf CEM 3396], [http://www.sdiy.info/w/images/CEM5508_datasheet.pdf CEM 5508], [http://www.sdiy.info/w/images/CEM5530_datasheet.pdf CEM 5530]<br />Some are also freely available from:
* [http://curtiselectromusic.com/Product_Overview.html Curtis Electromusic]
* [http://synfo.nl/ Synfo.nl]
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