Hi Brad!

Is it possible that NSFPlay doesn't accepts the full range of registers for S5B? According to the doc we should be able to use C000-DFFF for address and E000-FFFF for data.

Looking at the code, it seems we just accept exactly C000 and E000. This also matches my quick testing, I get no audio if I write to E001 for example.

The reason why we would want the full range is to give us more options to work around conflicts with VRC7 and N163.
I may be looking at the wrong code, let me know if there is something we can do.

-Mat