Basic Questions & Answers thread

I thought the tiles were disappearing because of something like that. Is there anyway to fix this? (Yes extra tiles were added to the signpost to account for Metal Sonic) Would removing something from the end of act point tally thing fix the problem (Like the Total Score thing. That's not necessary as it's in the top left anyways.

 

OK, I'm coding a monitor which would take you to another zone & it's act so if you hit the monitor in Emerald Hill Zone 1, you'd go to Chemical Plant Zone 1.
I tried using Misc_9454 & get the levels from there but it always gives me a wrong number of operands error.

Code (ASM):

1.  
2. zone_monitor:
3.    cmpi.w  $D00 ; is the level EHZ1?
4.    beq GoTo_CPZ1 ; if yes, branch.

Of course, I'm just hiding what it's real purpose will be.

 

Of course you have a wrong number of operands, cmpi needs two values to compare them :p
If that was Sonic 1, you'd have to do cmpi.w #$D00,($FFFFFE10).w
Not sure about Sonic 2, but I seem to recall it's FFFFFE10 there as well

edit: I just checked it. Yes, the location is FFFFFE10. But EHZ1 isn't $D00, it's $000.
$D00 is CPZ1, which is your destination, not your source, from what I gathered from your post.

 

If I remember my last brush with ASM and Sonic's engine, it's

if level = ehz
set level = cpz 1
clear starpost counter
jump to restart level code

I could be wrong, but I believe that's all you really need to do to get it working.

 

This right here is all you need:

Code (ASM):

1.         move.b  #$08,($FFFFFE10).w  ; Starpost level change
2.         move.b  #1,($FFFFFE02).w            ; Reload level

 

You really are awesome.
Thanks, I'll do the rest this myself (it's not a plain old zone monitor you see).

 

So do I want something like this?

Code (ASM):

1.  
2. LoadPLC2:
3.        
4.         movem.l a1-a2,-(sp)
5.         cmpi.b  #$01, ($FFFFFFFE)
6.         bne.s   SonicLoadPLC2
7.         lea (MArtLoadCues).l,a1
8.         bra.s   ContLoadPLC2
9. SonicLoadPLC2:
10.         lea     (ArtLoadCues).l,a1
11. ContLoadPLC2:
12.         add.w   d0,d0
13.         cmpi.b  #$01, ($FFFFFFFE)
14.         bne.s   SonicLifeIcon2
15.         lea (Nem_MLives).l,a0
16.         bra.s   ContLoadPLC22
17. SonicLifeIcon2:
18.         lea     (Nem_Lives).l,a0
19. ContLoadPLC22:
20.         move.w  (a1,d0.w),d0
21.         lea (a1,d0.w),a1
22.         bsr.s   ClearPLC
23.         lea ($FFFFF680).w,a2
24.         move.w  (a1)+,d0
25.         bmi.s   loc_15D8
26.  
27. loc_15D0:
28.         move.l  (a1)+,(a2)+
29.         move.w  (a1)+,(a2)+
30.         dbf d0,loc_15D0
31.  
32. loc_15D8:
33.         movem.l (sp)+,a1-a2
34.         rts
35.  

 

I was following Qjimbo's guides to Split Dissassemblies. I had it all set up exactly as it was written, and then I went onto the next guide about basic level editing. I opened up SonEd2 and when I tried loading Marble Zone the SonEd2 screen just came up blank, while the Status Screen said that everything it tried loading couldn't be loaded. Does anyone know what I might need to do? It's probably so obvious, but being new to hacking I'm not seeing it. If you know what might be needed to be done, please help.

 

The only thing I can think of is that you forgot to split your ROM, although if you followed the guide step-by-step I don't know how that could have happened.

 

Be a little more specific. You are loading up the correct .sep file, right? There is a link to the project files on the disassemblies page.

 

I was opening up the mz1.sep file. And yes, I remembered to split the file.

 

In which case it sounds like a path problem. Your project files are inside <your disassembly directory>\project right? If they're inside any other folder it won't work.

 

Yes they are...and I took a point of it of making sure none of the folders had more than 8 letters or spaces

"C:\SonEd\s1h\project" Is that correct?

 

Maybe the files that you've got aren't the same titles as what SonED2 is looking for? Since you seem to have used a split disassembly to create the project files, odd are that the project files weren't renamed properly.

For example, the disassembly produces files with little more than the zone name for the filename in each folder, while SonED2 naming also includes the original offsets and such in filenames.

 

Hi, I recently downloaded the Sonic 2 game, and IcyHexEplorer. When I followed the tutorial on Sonic Retro's HomePage, I came across a problem when I tried to run the game on the emulator.

I entered some values onto the hex editor of the Sonic Rom, then I saved it. When I tried to run the Rom, I was unable to play the game, and a red screen popped up on the Emulator screen.

Anyway you could help me out? I reall want to start hacking with the Sonic Game.

 

Checksum checksum checksum.

That red screen is caused by the checksum being incorrect, you can bypass it's check by going into your emulator options and ticking "Auto fix checksum".

Also I recommend you also take a look at my split disassembly guides, you might find those more intuitive.

 

Yeah, after I made a topic about this I saw the other topic that answered this question. :P But thanks.

 

Could be. In the guide it showed him opening up a file named mz1.sep, but if it's not working for me, how do I change the titles (I know click "rename" but what is the format for titles that SonEd2 uses?)