>I also tried writing it for the 2600 using a waveform, then setting a delay
and modifying the waveform, but each time you did, the speaker clicked.
Since then I realized that there is a "speaker click" sound on the 2600,
that could use the same algorithm (or similar) as that in the Apple ROM.
Never did anything about it, but if I were inclined to, that's where I'd start.
>
The TIA seems to be able to change the output twice per scanline, but you
have no real control over the internal counters, that trigger an output
change.
Therefore I think the most promising way to implement a 'save' feature on
the VCS would be a routine, that is timed by several STA Wsync. You could
set the noise type to $00, which sets the output to allways high, and then
generate your own squarewave by flipping between maximum and minimum volume.
Ciao, Eckhard Stolberg
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