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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
dco1

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.

 


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


waveforms
demo Hear OKI square wave
demo Hear OKI sawtooth wave

 



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

ex800 tech

 


adsr ENVELOPE
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.


waveforms

 

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.


waveforms

 

 

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.


NJM2069

 

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


BBD 3209



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


steps



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.


mooglsayer
demo (ABOVE) Moogslayer test cutoff HEAR


 

warning EX-800 RELATED MODELS:

POLY800

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

X-POLY
VST
commercial
poly 800 plugin
audio oddy Bedroomproducers Free
sample pack
(includes various classic vintage synthesizers)
Free





demoAUDIO DEMO

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 :)


 

video VIDEO SELECTION

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

 

module

 



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

 

 

manual
MANUAL


service manual
SERVICE MANUAL
(both poly and ex)


factory patch load
FACTORY PATCHES

 

 

 

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
CHECK OUT EBAY OFFERS

 

tech poly800

 

 

 

 

 

tech poly800

DCO program Oki MSM5232 filter VCF

awardSPECIAL AWARDS:

solid solid
Cheap as hell nervous edit



comment


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