Comments (5)
Does the Original Edition without your hack work correctly?
from nes_mister.
@paulb-nl: Yes, it works correctly without the hack.
from nes_mister.
There are also some other changes in your hack related to bus conflicts at rom addresses 3A6, A4D and B5A. Two of those are the issue causing the wrong chr bank to be selected.
3A6: Here either chr bank 0 or 1 is written but $8001 contains 0 so only bank 0 will be selected.
B5A: Here bank 2 or 3 is written but $80F7 contains 2 so only bank 2 will be selected.
Your hack would need some more changes if you want to prevent bus conflicts properly. You could also use NES2.0 submapper 1 which specifies No bus conflicts for CNROM: https://www.nesdev.org/wiki/NES_2.0_submappers#003:_0,_1,_2_CNROM
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Dank u wel, Paul, I completly forgot about the other changes to the rom, which I applied in 2018 after reading a blog post about bus conflicts: http://nerdlypleasures.blogspot.com/2018/09/exciting-developments-for-nes-roms.html
These changes never were a problem, but apparently together with my hack they messed something up. I will now discard those changes and opt for NES2.0 submapper 1 instead, as you suggested.
I will now close this issue, as it is not core related.
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The bus conflict changes from Nerdly pleasures are incomplete. Even without your hack it will not work on original hardware (CNROM boards) or emulators that emulate bus conflicts with mapper 3.
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