The cpu and embedded peripherals of the MegaDuck are a clone of the Game Boy which have been modified in small ways to make them incompatible. So patching would typically be disassembling the GB ROM to assembly and modifying the places where it uses changed registers and values. In practice it can be a little more complicated for things like the music driver.
The technical info for the process is available here:
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mario land on the megaduck ??? how did you achieve this
how can the megaduck handle this
The cpu and embedded peripherals of the MegaDuck are a clone of the Game Boy which have been modified in small ways to make them incompatible. So patching would typically be disassembling the GB ROM to assembly and modifying the places where it uses changed registers and values. In practice it can be a little more complicated for things like the music driver.
The technical info for the process is available here:
https://megaduck.dev/#summary-of-hardware-changes-versus-the-game-boy
dude. that is some awesome stuff. never knew this
Sweet time to test it on my Pico Flashcart