[sdiy] A SID question...

[danial stocks]

I think I remember reading this tho I cant remember where, so maybe I'm 
making it all up and I just thought I read it? but I think someone said 
something along the lines of that you do get bleed thru, and if you wish to 
stop this, you write 0000000 to the osc buffer set it to off [no frequency 
of oscillation].. something like that, but there is a way to switch off the 
osc..
Cheers,
Dan

> >It appears that even if you *don't* set the gate bit but have a waveform
> >selected and data in the frequency registers, the waveform will still be
> >produced at a very low level at the audio out... is this right?  Does SID
> >ever totally "shut up" (besides reset and/or turning the volume all the 
>way
> >down)?
>
>The oscillators do continue to work even if you switch of their respective
>gate bits. Otherwise you would not hear anything instead of a disappearing
>tone controlled by the R of that voice´s ADSR.
>
>How low is a "very low level" for you ? I mean, the output signal is 
>normally
>around 5...8 Vpp, ant there is a digital noise floor of approx. 40 mV in 
>every
>device containing a SID i ever built. If there is an output from switched 
>off
>oscillators, then this is for sure less than that.
>
>I have looked in the 6581 datasheet, but could not find any information on
>that topic.
>
>
>-Michael Buchstaller

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