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04-24-24 12:13 PM |
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| 0 users currently in ROM Hacking | 3 guests | 1 bot |
| Main - ROM Hacking - General Megaman Hacking Thread | New thread | New reply |
| SAHunterMech |
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Newcomer Level: 5 Posts: 3/4 EXP: 379 Next: 150 Since: 03-01-18 Last post: 2245 days Last view: 2240 days |
Well I definitely appreciate your help so far. I have one theory but I'm not sure if it's the cause of the issues. In the MegaMan 5 ROM map (https://datacrystal.romhacking.net/wiki/Mega_Man_5:ROM_map), there's a section called "Main Banks" which has something called 1-byte relative pointers. If the palette data is 1-byte then it's not going to be the numbers I've looked for previously, correct? |
| Quick Curly |
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 Giant Red Paratroopa Level: 77 Posts: 1413/1443 EXP: 4171653 Next: 19476 Since: 06-15-08 From: Earth Last post: 19 days Last view: 19 days |
You're welcome. 
That's interesting. There is an "initial sprite palette" at 0x3D4C2 that is lit up in blue (logged data bytes). I overwrote "2C 11" with "05 2A", but never saw those colours set as Mega Man spawned into Stone Man's stage. Instead, the values at 0x0255A were applied. Sorry for any misinformation I may have provided. I was attempting to make educated guesses for potential approaches based on what I've seen before in some games, but different games use different methods to achieve similar things, so it might not be a line of code with the palette value(s) represented as code while logging instead of data appearing as a table with code loading the values one by one. Again, I'm not sure, but I'm interested in the experimental process. Sorry in advance for what might seem like a wordy post that goes back and forth a lot. I was updating the post as I was trying things out, so my processes of thinking and acting are covered. Here's what I've found so far. In FCEUXD, I tried setting write breakpoints to $3F12 and $3F13 (the part of the palette for Mega Man where 2C and 11 show up when viewing the PPU Viewer in the built in hex editor), but the debugger never froze to confirm the source of the palette changes. So, I used the Code/Data Logger and ran it from the main menu while loading up Stone Man's stage to log the code and data used. 0x0254A-0x0254D (0x4) - 0F 0F 2C 11 - This palette is used while holding B to charge up (I tested this palette by changing "2C 11" to "05 06" to notice the reds flash at the beginning of the charge up). 0x0255A-0x0255D (0x4) - 0F 0F 2C 11 - When spawning into Stone Man's stage, this was the palette loaded for Mega Man (I changed "2C 11" to your "3C 02" and the colours were set correctly when spawning in, but reverted after shooting). I suppose the similar "2C 11" palettes nearby could be involved with the multiple colours for the charging up animation, maybe. I just searched for "0F 0F 2C 11" in NES Memory, and found the object and sprite palettes within $0600-$061F. I set a write breakpoint to $0612 (currently, your modified 3C). When I tried shooting with Mega Man, the debugger froze on $9177 (0x37187 in ROM).
$8F4F is 0x36F5F in ROM. The value is 2C. When I changed it to 3C and shot, Mega Man's colour didn't change back to the original. $8F57 is 0x36F67 in ROM. The value is 11. When I changed it to 02 and shot, Mega Man's colour didn't change back to the original. There are multiple values of 2C and 11 together within this area. Perhaps they all need to be changed? More testing might be required. Just tried charging up. The original blues for Mega Man are displayed while charging; however, after changing the 6 "2C" bytes to "3C" and the 6 "11" bytes to "02", those colours are visible throughout the initial charging animation. However, original blues are still visible in full when fully charged. Not sure if it's how you want it to look or not. I tried changing all of the nearby "2C 11" strings back in the 0x0254A-0x02599 area in the ROM in the hex editor, but I can still see some blue (even though the new "3C 02" appearance shines through if you look carefully). Again, more testing might be required. I'm not sure what the relative pointers might have been, but I believe that I was at least able to find the solution to your main issue. Please keep us updated. |
| SAHunterMech |
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Newcomer Level: 5 Posts: 4/4 EXP: 379 Next: 150 Since: 03-01-18 Last post: 2245 days Last view: 2240 days |
Eureka! That's it! Currently I'm messing around with different color combinations to see what works best. I may now move on to editing the color of his projectiles. Thanks again! |
| Googie |
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Giant Red Paratroopa Level: 77 Posts: 1330/1407 EXP: 4180449 Next: 10680 Since: 02-19-07 From: Brooklyn, NY Last post: 7 days Last view: 7 days |
Posted by ZieldakPosted by GoogieYou mean the disappearing blocks, right? I remember seeing similar glitches happening in your first hack and some others (redownloaded your hack's readme, yeah, you even pointed it out), which is probably (definitely actually) caused by the same thing. Thanks again, man. I changed the offsets and Mega Man doesn't fall through the floor. The Blocks on the other hand still pop up even if in the editor I deleted them but it doesn't affect the game play. Here's some screens. 
I never realized how buggy MM1 is, I hope when I hack MM2 in the future I won't go through this, I'll finish the rest of Ice Man's level by today, and I'll tackle Fire Man's level this weekend. I really want this hack to be decent when I'm done with it, unlike my first MM1 hack, which I'll admit is bad and buggy...  ____________________ My Linktree |
| Zieldak |
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 Crow Level: 42 Posts: 373/387 EXP: 512284 Next: 9078 Since: 12-01-11 From: Hungary Last post: 1309 days Last view: 1200 days |
Try removing the Disappearing Block Generator (Enemy ID 10) too in case you didn't.
I should look further into this Forget Special Objects stuff. *Checks vanilla game but edits that code* It's good to know the Yoku Blocks still work properly even if you NOP those bytes. |
| Zynk |
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 Purple Leever Level: 32 Posts: 177/209 EXP: 195930 Next: 10512 Since: 10-19-12 Last post: 78 days Last view: 1 day |
Anyone know how to adjust the cursor on Mega Man 6's title screen? I managed to hack-in the JP title into the US ROM, but the cursor is a tad lower positioned.
 ____________________  |
| Quick Curly |
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Giant Red Paratroopa Level: 77 Posts: 1415/1443 EXP: 4171653 Next: 19476 Since: 06-15-08 From: Earth Last post: 19 days Last view: 19 days |
0x7CEF8: "PRESS START"/"GAME START" vertical placement for the cursor after moving the cursor (AB).
0x7CEF9: "PASS WORD" vertical placement for the cursor after moving the cursor (BB). 0x7E4CE: Horizontal placement for the cursor (2C). 0x7E4D7: Initial vertical placement for the cursor when the title screen loads (AB). Increase a value for the cursor to appear lower towards the bottom of the screen. Decrease a value for the cursor to appear higher towards the top of the screen. Relevant code with a write breakpoint for $04CD: When loading the title screen ($E4A7 in RAM is 0x7E4B7 in the ROM):
After moving the cursor ($CED8 in RAM is 0x7CEE8 in the ROM):
Hopefully this helps. Best of luck! |
| Zynk |
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Purple Leever Level: 32 Posts: 178/209 EXP: 195930 Next: 10512 Since: 10-19-12 Last post: 78 days Last view: 1 day |
Yes! This did it! Thanks QC ____________________ |
| Trinitronity |
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 Porcupo Level: 38 Posts: 303/311 EXP: 351044 Next: 19403 Since: 02-04-13 Last post: 1936 days Last view: 578 days |
So...I assume there's still no progress in terms of music hacking in MM3? |
| DannyPlaysSomeGames |
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 Octorok Level: 12 Posts: 1/29 EXP: 7066 Next: 855 Since: 09-16-18 From: Somewhere Last post: 1703 days Last view: 189 days |
Hey there, I'm new here, although I've seen this thread a couple of times.
Now that I finally decided to get an account, I was wondering if I could get some help. So I've had a couple of old trash Megaman ROM hacks of my own for a while now and I decided to actually make something decent with them. Right now, I'm trying to rework and redesign the sprites for a MM1 ROM hack. I was wondering if there's a way to change the x/y pos of some of the sprite tiles and if you can even swap them to take advantage. 
The thing I wanna change specifically is Megaman's face's position. I know there's like a disassembly floating around there, but it's only partial, and I couldn't find any details on the sprite layouts. Anyways, thanks! ____________________ Hey there |
| gazou |
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Newcomer Level: 6 Posts: 3/6 EXP: 665 Next: 242 Since: 09-12-18 Last post: 2030 days Last view: 2051 days |
your glasses are very 3d-y |
| DannyPlaysSomeGames |
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Octorok Level: 12 Posts: 2/29 EXP: 7066 Next: 855 Since: 09-16-18 From: Somewhere Last post: 1703 days Last view: 189 days |
Posted by gazou Yes, those are 3D glasses, cool. ____________________ Hey there |
| Googie |
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Giant Red Paratroopa Level: 77 Posts: 1354/1407 EXP: 4180449 Next: 10680 Since: 02-19-07 From: Brooklyn, NY Last post: 7 days Last view: 7 days |
Posted by DannyPlaysSomeGames I like how the character looks, hope to see more... ____________________ My Linktree |
| Insectduel |
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 Hammer Brother Level: 68 Posts: 1051/1069 EXP: 2687326 Next: 41474 Since: 02-16-08 From: Insectduel's office Last post: 1255 days Last view: 1254 days |
Posted by DannyPlaysSomeGames I did remember doing sprite layouts even to enemies, but I hardly touch this game in a while. Now I kinda forgot where the x/y sprites located but the palette quad is easy. Honestly, Mega Man 1 functions assemble sprites differently than Mega Man 2 but the sprite assembler for Mega Man 1 would be useful if someone designed it. |
| DannyPlaysSomeGames |
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Octorok Level: 12 Posts: 6/29 EXP: 7066 Next: 855 Since: 09-16-18 From: Somewhere Last post: 1703 days Last view: 189 days |
Posted by GoogiePosted by DannyPlaysSomeGames Thanks. Posted by InsectduelPosted by DannyPlaysSomeGames You think a quick look at the disassembly or a keyword could help me find it? ____________________ Hey there |
| Thanatos-Zero |
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 Nipper Plant Level: 45 Posts: 420/423 EXP: 652732 Next: 7432 Since: 11-25-08 From: Germany - Rheinlandpfalz - Wittlich - Zur Phillippsburg 25 Last post: 1089 days Last view: 1051 days |
Zieldak has extensive knowledge about Megaman 1.
If you ask someone about MM1 danny, it is him. ____________________ I was a prisoner enclosed in the void, were everything might end up just as myself. There I was called the death in the void, but after a long sleep my drill was ready to pierce the void. I came back... to guide those who are in doubt and to crush any corrupted mind. "Just who in the hell do you think I am?!". |
| Zieldak |
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Crow Level: 42 Posts: 385/387 EXP: 512284 Next: 9078 Since: 12-01-11 From: Hungary Last post: 1309 days Last view: 1200 days |
Or I actually pay attention and answer the question.
No. The disassembly doesn't have detailed data on this. But I do. 18010-18195: Sprite data pointers (First pointer is 0688 which points to 18816; 0688 -> 8806 -> 18806 +iNES header> 18816) 18196-182B9: Animation data pointers 182BA-18349: Tile position data How to read sprite data: For example let's see the data at 18816, which is the first pointer of the table: 0A 00 1A00 2900 2A00 2B00 0900 0A00 0B00 1900 1B00 2001 {0A} 00 1A00 2900 2A00 2B00 0900 0A00 0B00 1900 1B00 2001 The first byte determines how many tiles the sprite uses. In this case, 10 ($0A). 0A {00} 1A00 2900 2A00 2B00 0900 0A00 0B00 1900 1B00 2001 The second byte determines which sprite assembly data is assigned to the sprite. 0A 00 {1A00 2900 2A00 2B00 0900 0A00 0B00 1900 1B00 2001} The rest is which tiles the game reads from the PPU, and which palette each tile uses. The first byte is the tile ID, the second is the palette. How to read animation data: For example let's see the data at 1A076: A8 0101010101010101010100 Each animation data starts with a byte that determines how many frames the animation is made up of, and how fast the animation is. In this case A8 means the animation has 11 frames ($0A=10 -> 10+1=11) and changes the animation frame every 9 frames. In other words: The first bit is the amount of animations, 0 means the animation has only 1 frame, and it can have a total of 16 frames. And the second bit is the speed of the animation. The higher the number is, the slower the animation is. 0 means it changes the current sprite every 1 frame. The slowest an animation can get is 3.75 animation frames/second, in other words the animation swaps sprites every 16 frames. A8 {0101010101010101010100} The rest of the data means which sprites we wanna use in the animation. In this case $01 is the idle sprite, and $00 is the blinking sprite. How to read tile position data: Probably the easiest data to read. This determines where each tile is drawn from the centre of the sprite. The order of the data is the same as the sprite data, so the first byte belongs to the first tile of the sprite. For example, $00 means it reads the first byte, $10 means it reads the 17th bytes from each of the following tables: 1834A-18449: Y position 1844A-18549: X position (facing left) 1854A-18649: X position (facing right) Keep in mind there may be sprites that use the same tile positions, and there may be enemies that even use the exact same sprite! In which case uh... uhhhhhh... good luck. Also, sorry if I got something wrong, I put this together in a hurry. EDIT: fixed some stuff |
| kuja killer |
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Level: 55 Posts: 588/628 EXP: 1243681 Next: 70508 Since: 03-20-07 From: Lake Havasu City, Arizona Last post: 280 days Last view: 5 days |
cool yea just to note, this is all the same format for mm 2 to 5. only difference is, it uses 2 bytes for the "number of frames + animation speed"
like 02 08 (2 animation frames, 8 speed) mm2+ isn't limited to 16 max frames in an animation like mm 1 was. |
| DannyPlaysSomeGames |
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Octorok Level: 12 Posts: 8/29 EXP: 7066 Next: 855 Since: 09-16-18 From: Somewhere Last post: 1703 days Last view: 189 days |
Thanks, Zieldak, now I can properly finish my protag's sprites. ____________________ Hey there |
| Trinitronity |
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Porcupo Level: 38 Posts: 307/311 EXP: 351044 Next: 19403 Since: 02-04-13 Last post: 1936 days Last view: 578 days |
Currently in the process of making a disassembly of my own Mega Man 3 hack:
Though I have no idea where the RAM and ROM sections start and how large they are...whoops 
Cannot find any info on that in the MM3 guides either, so...maybe anyone here knows the answer? |
| Main - ROM Hacking - General Megaman Hacking Thread | New thread | New reply |
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