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Posted By

Crown
on 2003-09-18
 Re: PAL and NTSC

It is more complicated than that. That memory area is unconnected if there is no SID-card plugged in, and in those case the whole area gives random values when read.

The test should setup oscillator 3 to output a known waveform, then continously read either $1b (OSC3) or $1c(ENV3) and see what you get there. Note tough that the data will be slightly different for each SID type and revision as well...

A good resource for the SID is here
http://stud4.tuwien.ac.at/~e9426444/



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