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Mapper 91 to MMC5 Question

Started by Dracula X, October 26, 2020, 05:35:48 PM

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Dracula X

I'm trying to see if I can convert this to MMC5 but it looks like Mode 3 to me a little

UxROM:
CPU $8000-$BFFF: 16 KB switchable PRG ROM bank
CPU $C000-$FFFF: 16 KB PRG ROM bank, fixed to the last bank


MMC1:
CPU $6000-$7FFF: 8 KB PRG RAM bank, (optional)
CPU $8000-$BFFF: 16 KB PRG ROM bank, either switchable or fixed to the first bank
CPU $C000-$FFFF: 16 KB PRG ROM bank, either fixed to the last bank or switchable


Mapper 091:
CPU $8000-$9FFF: 8 KiB switchable PRG-ROM bank
CPU $A000-$BFFF: 8 KiB switchable PRG-ROM bank
CPU $C000-$FFFF: 16 KiB PRG-ROM bank, hard-wired to last bank


MMC3:
CPU $6000-$7FFF: 8 KB PRG RAM bank (optional)
CPU $8000-$9FFF (or $C000-$DFFF): 8 KB switchable PRG ROM bank
CPU $A000-$BFFF: 8 KB switchable PRG ROM bank
CPU $C000-$DFFF (or $8000-$9FFF): 8 KB PRG ROM bank, fixed to the second-last bank
CPU $E000-$FFFF: 8 KB PRG ROM bank, fixed to the last bank


Should I change it to mode 1 to work around it or change it to mode 3?


Back to Thunder Force II hacking again.

Cyneprepou4uk

If your game always swaps both banks at the same time, then you can work with either 1 or 3 mode. Otherwise mode 3 only.

Why do you post info about other mappers besides 091 and MMC5? Never include irrelevant stuff in technical questions.

Dracula X

1. I'll remember that next time!

2. So I won't make a mistake with the wrong choice.
Back to Thunder Force II hacking again.