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Korg EX-800


Korg ex800

info Country: Japan
Weight: 2,5 Kg
Dimensions: n/a
audio demo trend price : 200€
manual factory sounds demo video comments

Korg EX-800 (1984)
Programmable Polyphonic Synthe Module


Module of the famous polysynth Poly-800 with some handy technical enhancements.

korg ex800

info MODULE unit can be rackmounted with optional ears.
Main panel features basic alphanumeric display, 15 buttons and 3 knobs

Back panel terminal connectors:
- Midi interface (with Thru)
- tape inferface
- headphones
- main out
- pedalswitch input for program UP
- switch selector between synth and tape mode

ac Power supply is external with 9V with negative on center.



edit TECH main unit is a 8 bits controller CPU Intel 8050 family.
Music oscillator DCO is based on a OKI MSM5232 chip, best known as implemented on some early '80 arcade games (now emulated by famous MAME emulator).

OSCILLATOR The OKI generates 8 DCO digitally controlled oscillators assignable in 2 different manners:
1- double mode: 2 x 4 voices for a thicker richer sound
2- whole mode: 1 x 8 voices for full polyphony.

DCO Editing parameters
TECH: Poly-800 cannot be computer- edited since it cannot handles Midi Exclusives.


an oscillator features 2 summable waveforms sawtooth and square plus 4 additive harmonic octaves heights at 16' 8' 4' 2' + 1 white noice generator.

demo Hear OKI square wave
demo Hear OKI sawtooth wave


EDIT INTERFACE: poor and sluggish with 1 parameter per time.

ex800 tech


there are 3 EGs:
- 1 DCO1 amplitude: 6-stages ADBSSR
- 1 DCO2 amplitude: 6-stages ADBSSR
- 1 VCF: 6-stages ADBSSR.
The ADBSSR stands for: Attack, Decay, Break point, Slope, Sustain and Release.



lfo LFO there are 2 triangle-shapped modulators:
- MG1 modulates FILTER VCF
- MG2 modulates DCO pitch.
The modulator is triggered by joystick control with possible delay start function.




filter FILTER a limited paraphonic filter based on a single NJM2069.
The chip is a resonant (but not up to self-resonance) analog 4 poles lowpass with cutoff, contour and possible polarity reverse.



fx EFFECTS analog stereo chorus board based on BBD 3209 + driver 3102.

BBD 3209

features a very basic 256 steps sequencer syncable to external Midi clock


memroy MEMORY:
- 64 RAM patches
- NO ROM memory.
RAM system based on soldered CR2032 battery.
Midi Sysex has been implemented from previous poly-800.

DCO Editing parameters



repair synthex MODIFICATION filter VCF values are quantized in 99 numbers but some nice guys made out a nice hardware modifications called "Moogslayer" that adds 2 real-time knobs for cutoff filter and resonance.

demo (ABOVE) Moogslayer test cutoff HEAR


warning EX-800 RELATED MODELS:


Poly-800 first version, It is quite the same it but features a Chorus board instead of digital delay. Memory backup system is older with no CR-2032 battery and no Sysex handling.

poly800 mk2 Poly-800 II enhanced POLY-800 with new motherboard and a 12 bits digital delay.
korg ex800 MEX-8000 memory expansion adds 4 extra banks.

effet VST PLUGIN / SAMPLED VERSION there are some free and commercial samples set:

  name price demo
EFM Oddse Poly-850

then renamed

poly 800 plugin
audio oddy Bedroomproducers Free
sample pack
(includes various classic vintage synthesizers)


demo Machinery - all poly800 : overdub+drum + vocoder Roland SVC350
demo All poly800 + Volca beats drums
demo shine on your strings
demo moogish
demo Moogslayer bassline
demo ->more Demo at the POLY800 MK2 page
demo just few demos, please do send some of your poly800 audio clips :)



KORG EX-800 MOD#01 Test of Korg EX-800 Modified Korg EX-800
MOD#01 Test Modified




Company: Korg
Model: EX-800
Class: Synth module
Dates: 1984
Price: 200€
Synthesis: analog
Oscillator: 1 or 2 DCO
Polyphony: 8 voices
Filter: low pass
LFO: 2
Sequencer: 256 steps
Effect: analog chorus
Demo: 5




service manual
(both poly and ex)

factory patch load




tech poly800

original scan 3
edit original brochure


original scan 2
edit original brochure


original scan 2
edit original brochure



tech poly800

Korg EX-800 FOR SALE

Korg EX-800 for sale


tech poly800






tech poly800

DCO program Oki MSM5232 filter VCF


solid solid
Cheap as hell nervous edit


REVIEW "classic, still affordable however, don't expect too much sonic power: poly/ex800 is pretty raw and basic. Good for buget."

manual manual
-cheap - edit
- analog
- storage
-new features -sequencer

"This instrument has been engineered for highest quality sounds and superb reliability" - Korg Manual


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* but pic number 3 from ebay auctions.

korg ex800 3.5 out of 5 based on 24 ratings. price €150