[sdiy] Wikipedia DCO article

[Simon Brouwer]

Bob Weigel schreef:
> Oh I see what you mean.  Yea I was thinking of the latter synths there
> and I did gramatically group them.  I was thinking people probably
> associated a *type* of synth with 'Juno' and I was noting how this new
> series appeared the same year and THESE had the cpu driven
> waveforms...I'll make it more clear.  The MKS30 and JX3P are timer as I
> recall along with the SX Kawai's, the Bit series and..maybe the poly61
> too...can't recall.

The bit 99 DCO's used two 74LS monostable multivibrator based high
frequency oscillators, divided down by 8253's. These were followed by
4-step binary counters whose outputs were summed using resistor networks
to make a crude sawtooth.

The drawbacks of this approach were it sounded a bit bland (especially at
low pitches) and that you couldn't have PWM.

-- 
Vriendelijke groet,

Simon Brouwer
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