Thank you. I had no memory of the outcome of this.
Currently I have no plans to use AUDIN for bank switching. I am using it for eeproms and controlling LED strips.
But it is nice to know that there is a way to extend memory if needed.
Currently there is no AUDIN bank switch support in cc65. Adding it as an extra top address pin is not trivial as we need to place the bootloader also in the middle of the ROM when AUDIN is high at startup. Because of this complexity I never tried to implement it.
Edited by karri, Sun Jan 10, 2016 10:55 PM.