[sdiy] Korg DSS1 DMA oscillators, the old beast!

[karl dalen]

--- Den lör 2010-01-23 skrev Antti Huovilainen <ajhuovil at cc.hut.fi>:

> Från: Antti Huovilainen <ajhuovil at cc.hut.fi>
> Ämne: Re: [sdiy] Korg DSS1 DMA oscillators, the old beast!
> Till: "karl dalen" <dalenkarl at yahoo.se>
> Kopia: "Eric Brombaugh" <ebrombaugh1 at cox.net>, "synthdiy DIY" <synth-diy at dropmix.xs4all.nl>
> Datum: lördag 23 januari 2010 21.18
> On Sat, 23 Jan 2010, karl dalen
> wrote:
> 
> > But how did Korg, Emu ,Fairlight do it then?
> > The timers run at max 64khz so the DMA must run
> at....???
> > Some how the gate arrays must be synced to this
> clock?
> 
> They didn't use oversampled sigma-delta DACs. 

That we already know, the question was *how* did they do it?
Noone seams to know how this DMA thing works in the DSS1?

>Upside is
> that you can do truly variable samplerate. Downside is that
> you will not get nearly as much resolution for the same
> cost, as smooth freq response nor any attenuation of the
> image frequencies past 20 kHz.
> 
> Antti
> 
> "No boom today. Boom tomorrow. There's always a boom
> tomorrow"
>   -- Lt. Cmdr. Ivanova
> 


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