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Jul 24, 2019 at 15:16 comment added cjs I think you were looking at the wrong bit in that document, about the "NRxx" registers, which the locations in question are not. The relevant line is, "$FF27-$FF2F always read back as $FF." As I explain in my answer, that's likely just generated by the sound device chip and not based on anything stored in it.
Jul 26, 2016 at 13:57 vote accept JAL
Jul 22, 2016 at 19:43 review First posts
Jul 23, 2016 at 7:34
Jul 22, 2016 at 19:37 history answered NobodyNada CC BY-SA 3.0