Hola,
On Sun, 19 Nov 2000, Nate / DAC wrote:
> Yes, it does. It achieves something like 33 kHz 8-bit stereo (with two
> SIDS) and I think somewhere close to 60 kHz in mono. Since the SID can
I think there is a misunderstanding of what PWM is/how it works. There
will be an article in the next C=Hacking on this very subject, which will
hopefully clear things up.
Regardless, I don't think this is what Richard was talking about. He was
talking about modifying the frequency register to generate arbitrary
waveforms -- I think this is described in disC=overy issue #2. For
example, take a triangle waveform. On each cycle, SID adds the 16-bit
frequency value to a 24-bit counter, and outputs the upper bits of
the 24-bit counter. So now imagine setting the frequency to some high
value, then zero, then some high value. The output would look something
like
*
*
*
*****
*
*
*
i.e. a new waveform. To answer Richard's original question, I have not
heard of anyone trying this, and would be interested in the result.
-Steve
-
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