Sonic Sx Edition

I present my new Hack, i worked hard to make everything stable and fully playable. The most important changes are on the level structure and the same graphics (Except 3rd act, LZ and SBZ remains with the same graphics). I then implemented the S (Invincibility and speed) and goggle display monitors (Infinite air necessary to overcome underwater SBZ). I then added the spindash the waterskimming (necessary to overcome LZ) and jumpdash (With 3 Chaos Emeralds). I attach the rom and some pictures.

 

The background art for some of the levels in your hack is not bad, in fact I actually like some of them . the game game-play is pretty decent to me also. the only thing that I really didn't like about it was how most of the songs you use from sonic 2 were all from the S1Hacking studio program but I guess it's a start for porting some type of new music. the only other thing that I think you should do is change the sprites back to the original art for sonic and fix some of the tiles for GHZ2 & SLZ (just a suggestion anyway).

 

Latest version, I modified the Labyrinth zone, arranged the layout of the Green Hill Zone and a few bugs. I can not find the source because formatting pc. : (So I think the project will stop here. Thank you all.

Sonic_1___Sx_Edition.zip

 

It's good, although there are some glitched sprites. But nice, anyways.

 

This hack looks great bit jagged but great


Nice job on bridge zone and scrap brain under water???

 

I would like to get my hack, but I lost the sources. It is possible to disassemble the ROM to recover?

 

I'm afraid not, its only set up for a sonic 1 rom bin file. And thats why its a must to back-up your files, so getting into a routine of doing so is a wise decision.

 

Well actually you can disassemble it, you'll just basically end up with a brand-new S1 disasm, etcetc. You'd probably be best off starting over, and making frequent backups.

 

Splitting art and music: Possible


Splitting ASM code: Possible, but don't even dare, it's hard as shit and completely undocumented / uncommented.

 

Splitting art and music is more than enough.


In fact, what interests me is the art to recover in terms of time cost me more.


For the ASM changes I can restart from a clean rom How can I do? thanks

 

Just run split.bat again and then you can restart again. From there, you can edit the ROM until your hearts content.

 

Thanks, but does not work. Unfortunately I have a separate arts and palettes for each level and therefore when I try to rebuild and play, if I select the level whit my arts give me purple screen.


The strange thing is that give me no errors in the rebuilt log.

 

Purple screen... I've seen that not long ago, there was too many things in the level's PLC. Maybe it's something similar in this case.

 

Yes, this can happen when lets say for example: You have dc.w $B items in the plc list PLC_GHZ1:. You decide to add a new entry, you count and say you miscounted and thought there were $C items. You change the $B to a $D and "Purple Screen" may occur because it's trying to load the last entry in that PLC. However because that isn't the right amount you get that screen in your face basically.

 

So should I change to resolve all addresses in the PLC list? I think not being able to do so. Assuming that succeeds, then the enterprise would cost me a lot in terms of time. Should I start over with a new hack.

 

No need to go that far.


Here's an example:




PLC_GHZ: dc.w $B


dc.l Nem_GHZ_1st ; GHZ main patterns


dc.w 0


dc.l Nem_GHZ_2nd ; GHZ secondary patterns


dc.w $39A0


dc.l Nem_Stalk ; flower stalk


dc.w $6B00


dc.l Nem_PplRock ; purple rock


dc.w $7A00


dc.l Nem_Crabmeat ; crabmeat enemy


dc.w $8000


dc.l Nem_Buzz ; buzz bomber enemy


dc.w $8880


dc.l Nem_Chopper ; chopper enemy


dc.w $8F60


dc.l Nem_Newtron ; newtron enemy


dc.w $9360


dc.l Nem_Motobug ; motobug enemy


dc.w $9E00


dc.l Nem_Spikes ; spikes


dc.w $A360


dc.l Nem_HSpring ; horizontal spring


dc.w $A460


dc.l Nem_VSpring ; vertical spring


dc.w $A660



If you replace "PLC_GHZ: dc.w $B" with "PLC_GHZ: dc.w $C", you'll get a purple screen because the game will try to read the following data and use it as addresses for the loading routines. That first word declared right after PLC_GHZ is the number of entries minus 1. A global file for green hill will go in 0, nem_ghz_1st and nem_ghz_2nd won't have to be loaded, and therefore the first word declared will be B+1-2=A.

 

Basically, the game crashes like this because of Nemesis' decompression routine. If it tries to parse some wrong data, you'll always end up with incredible glitches.


The data is definitely wrong, but not due to PLC. Well, actually there are lots of PLC problems like PLC buffer overflow (this causes the game to go into infinite loop on the title cards) or wrong data being decompressed if you put a wrong number of entries into a PLC block (like SpirituInsanum and Animemaster pointed out) but not in this case.


The reason is simple - your art. The art you split from ROM is totally corrupted/wrong, efforts to decompress it cause a game crash. Split.bat will work if only you manage to keep all data in its original offsets. The program has no clue where to find your data, it just follows the given offsets considering the ROM wasn't reassembled. There is no use in Split.bat unless you have a clean ROM, or the one edited by ESE.