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04-23-24 05:46 PM |
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| 0 users currently in ROM Hacking | 2 guests |
| Main - ROM Hacking - Anybody happen to know how... | New thread | New reply |
| RetroRain |
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 Fuzz Ball Level: 66 Posts: 207/994 EXP: 2437642 Next: 24209 Since: 09-30-07 Last post: 1932 days Last view: 954 days |
Does anyone know how Mega Man 2 writes to the Pattern Table, exactly? The game has no CHR-ROM, only PRG, and I have been searching for a couple of days, and haven't had any luck. It is possible that address $F7 has something to do with it, but I don't know how. I will keep looking, but if somebody already has information about this, I would appreciate it. It is the last part I need to complete the new game engine I coded. I need to know how it writes to the Pattern Table, because I want to swap Mega Man's graphics in/out.
EDIT - Why am I so stupid sometimes? I know how to do this. You have to set $2006 to $0000 (Pattern Table 1), then you can write what you want using $2007. And the game most likely has something that handles this. I think I figured this out on my own.  ____________________ My YouTube Channel |
| kuja killer |
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Level: 55 Posts: 53/628 EXP: 1243605 Next: 70584 Since: 03-20-07 From: Lake Havasu City, Arizona Last post: 279 days Last view: 4 days |
That's an extremely difficult task to do. MM 1, 2, 4 and 6 use CHR-RAM
MM3, and 5 are the only games that used CHR-ROM. In my personal experience, it is much more difficult to deal with a game using CHR-RAM in this case as opposed to ROM. It's just so much different and complex. :-s I've converted mm4 to fully 100% compatible CHR-ROM once, but it was a very long and difficult process. Sorry I cant be of any help to you in concern to mm2 since i know nothing at all about that game's inner workings. Every indidivual tile has to be written to through the ppu registers. It sucks. :-\ While on the other hand, if a game were CHR-ROM, it only takes like 1 or 2 writes to mapper registers and it'll swap the graphics all instantly without any delay or time or extra code needed at all. |
| RetroRain |
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Fuzz Ball Level: 66 Posts: 208/994 EXP: 2437642 Next: 24209 Since: 09-30-07 Last post: 1932 days Last view: 954 days |
I think you have to set $2006 to $0000 (Pattern Table 1), then you can write the data to the Pattern Table instead of the Name Table, using $2007. And I was poking around the ROM last night, so it probably has code that handles this. I'm used to games that have CHR-ROM as well. But then again, I'm kinda glad that in this instance, there is no CHR-ROM, because now I get to learn something new.
Thanks for trying to help. I appreciate your reply. ____________________ My YouTube Channel |
| Main - ROM Hacking - Anybody happen to know how... | New thread | New reply |
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