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.
TECH: Poly-800 cannot be computer- edited since it cannot handles Midi Exclusives.
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.
Hear OKI square wave
Hear OKI sawtooth wave
EDIT INTERFACE: poor and sluggish with 1 parameter per time.
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.
LFO there are 2 triangle-shapped modulators:
- MG1 modulates
- MG2 modulates
modulator is triggered by joystick control with possible delay start function.
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.
EFFECTS analog stereo chorus board based on BBD 3209 + driver 3102.
SEQUENCER features a very basic 256 steps sequencer syncable to external Midi clock
64 RAM patches
NO ROM memory.
RAM system based on soldered CR2032 battery.
Midi Sysex has been implemented from previous poly-800.
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.
(ABOVE) Moogslayer test cutoff HEAR
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.
||Poly-800 II enhanced POLY-800 with new motherboard and a 12 bits digital delay.
||MEX-8000 memory expansion adds 4 extra banks.
VST PLUGIN / SAMPLED VERSION there are some free and commercial samples set: