Re: New Documentation: An authoritative reference on the YM2612
Posted: Sun Nov 25, 2018 9:09 am
Nemesis tested the address/data ports relation some years ago
viewtopic.php?f=24&t=386&start=410
viewtopic.php?f=24&t=386&start=410
Not sure if he tested also with global registers ($2x) thoughIt turns out that writing to an address register stores both the written address, and the part number of the address register you wrote to. You can then write to either the data port at $A00001, or the data port at $A00003, and the write will go to the register number you wrote, within the part of the address register you wrote to. This means you can, for example, write an address to $A00000, then write the data to $A00003, and the data will in fact be written to the part 1 register block, not the part 2 register block.