Posted By
IstvanV
on 2017-03-26
10:53:34
|  Re: Revival of interesting 'n' funny stuffs
@MMS: The SID player on the Spectrum mixes the three channels (in the range 0 to 63 each) into a single signal, and then it uses table lookup to select the three 4-bit AY volume levels. Because of the non-linearity of the volume control, this method allows for better resolution, but it does also introduce its own kind of distortion, since the volume registers cannot be written at the same time.
By the way, the player has also been ported to the Plus/4 (D64: https://enterpriseforever.com/sound/sid-lejatszo/?action=dlattach;attach=17649, source: https://enterpriseforever.com/sound/sid-lejatszo/?action=dlattach;attach=17650). While there are already similar and not unlikely better players, it might be interesting for comparison with the other versions. This port also has an internal resolution of 6 bits per channel, but the output is converted with a table to TED levels.
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