8bitbubsy wrote on 2024-04-04, 16:57:

The title says it all. The reason I want to detect if an authentic card is being used, is because the clones seem to have a time constant limit of 233 (43kHz) instead of 234 (45kHz).
I want to achieve the maximum audio quality possible in my program code. 😀

Well, that one is easy to do: Just play a sufficiently long amount of silence samples that you can measure whether the card operates at 43kHz or 45kHz when you try to set 45kHz. As this is nearly 5% difference, the measurement shouldn't be that difficult to get precise enough.

Not a bad idea, I'll consider implementing that using the PIT timer to time it.