[Sam-users] So what's up in SAM Wolrd?
stefan.drissen at gmail.com
Thu Sep 2 22:10:45 CEST 2021
On Thu, Sep 2, 2021 at 9:05 PM Edwin blink <edwin.blink at ziggo.nl> wrote:
> Hi Stefan
> Thanks for explaining. I think I understand now. The higher octave channel
> must be changed before a full period has passed. A full period @ 61Hz(8MHz
> / 2^17 ) is ~16.4 ms.
> doing a delay of 192 scanlines is ~12.31ms which is good enough. This
> delay method was probably chosen as it is a convenient way to generate the
> required delay.
And thank you for filling in my missing link. Internally the SAA will also
be operating at some frequency, so cannot just start a note whenever you
like, but will also be limited to "slots" when they can start, so as long
as you are near enough you will get 100% phase cancellation. Cool. :-)
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