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1 user currently in Rom Hacking:  hukka |
| Acmlm's Board - I2 Archive - Rom Hacking - CHR extracting - when can(not) it be done? |
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g-fighter Newcomer Level: 3 Posts: 3/4 EXP: 51 For next: 77 Since: 09-22-05 Since last post: 23 days Last activity: 22 days |
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| Hey as I am quite the n00b, this question may be oversimplified, but Ive been messing with rom hacking recently and ive been looking a lot at cory arcangels stuff. hes released his source so i think its a valuable tool for learning. i noticed that he took out the character data from smb to use in his hack, which he did by taking the lower 8k from the ROM, the question is when can you or cant you do this? I want to do a hack of megaman 1, but it uses mapper#2, which ive seen described as 128k PRG / 0k CHR. Now, I have to admit, i dont really get how the CHR could be 0k in the first place (does that mean the CHR chip is literally blank) but the thing is is it still possible to extract the CHR data from MM? its not the bottom 8k (right?) but is there another way? thanks so much for any help |
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dan Snap Dragon Level: 43  Posts: 758/782 EXP: 534516 For next: 30530 Since: 03-15-04 Since last post: 20 hours Last activity: 14 hours |
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| There is no CHR-ROM in Mega Man. It uses CHR-RAM, the data for which is stored in the PRG banks of the ROM. | |||
DukeNukem007 Shyguy Level: 13 Posts: 88/90 EXP: 9247 For next: 1020 Since: 07-08-05 From: Quahog, RI Since last post: 18 days Last activity: 12 hours |
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Originally posted by g-fighter You're almost certainly going to find way more than 8k of chr -ram in a 128k/0k rom. A few prg-only roms also use a fairly lightweight compression (which seems to be either an almost universal LZ format, and/or a 1bpp format for some fonts.) It's tough to figure out but if you find "lumps" of graphics you can mess with things, i.e. I changed a few Guardian Legend gfx. Fortunately Megaman 1/2/4/6 don't have these despire being prg-only. |
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g-fighter Newcomer Level: 3 Posts: 4/4 EXP: 51 For next: 77 Since: 09-22-05 Since last post: 23 days Last activity: 22 days |
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| so in other words the graphics are just littered throughout the whole thing? what would be the best way to go about extracting them, so that i could consolidate them into a single CHR rom (obviously id have to lose some of em, but its for a hack anyway)? | |||
Dish Spiny Level: 38 Posts: 595/596 EXP: 355646 For next: 14801 Since: 03-15-04 From: Disch Since last post: 18 days Last activity: 18 days |
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| Open up a graphics editor like TLP and start copy/pasting. CHR is pretty easy to recognize just by flipping through the file (unless it's compressed -- but in MM1 it's not) |
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