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04-16-24 05:57 AM |
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| 0 users currently in ROM Hacking | 2 guests |
| Main - ROM Hacking - MM3/ROM Expansion Question | New thread | New reply |
| RetroRain |
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 Fuzz Ball Level: 66 Posts: 30/994 EXP: 2436132 Next: 25719 Since: 09-30-07 Last post: 1925 days Last view: 947 days |
I'm playing around with Mega Man 3. I added a 16K PRG-ROM bank to the ROM. $4000 bytes of 00s at the end of the file, and I updated the header. But the game won't run. Is there anything else that I should be doing? The only thing I can really think of, is that perhaps that $4000 bytes of data is being added on to a bank that is already holding its maximum capacity. By the way, this 16K of space is for graphics. I just want to practice swapping in new graphics into this game. ____________________ My YouTube Channel |
| smkdan |
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 Ninji Level: 36 Posts: 89/238 EXP: 288410 Next: 19700 Since: 05-26-07 Last post: 4052 days Last view: 4001 days |
NES games with CHR-ROM have data stored in PRG banks, then CHR banks. You need to store the new PRG banks before the CHR banks. Also it sounds like you want to add CHR rom, not PRG rom.
As for the game not running:
It needs to grab the reset vector from the "hard-wired" banks on reset, which it's probably grabbing from CHR-ROM (in the .nes file, I mean) because the new PRG-ROM data is not where it's supposed to be. |
| RetroRain |
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Fuzz Ball Level: 66 Posts: 31/994 EXP: 2436132 Next: 25719 Since: 09-30-07 Last post: 1925 days Last view: 947 days |
Thank you, I got it to work. ____________________ My YouTube Channel |
| Main - ROM Hacking - MM3/ROM Expansion Question | New thread | New reply |
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