Цитата:
The programmer sets an 11-bit register called CF to one of the 2048 values. These values are converted to a voltage inside the SID chip which drives the active amplifiers that implement the filtering circuit. This conversion is unique to each chip, but there seems to be a lot of clustering in the results, possibly due to manufacturing plant or materials used to make the chips. Chip revision does not seem to strongly correlate with the curve position, although there are not enough chip characterized yet to say anything for sure.
Собсно кривые работы фильтров отдельно взятых СИДов: