Mini-tutorials Thread

I updated the first mini-tutorial guide thanks to djohe. just remove the subq.b command. Including this is necessary as it can cancel the speed shoes while you gain invincibility and that wears off.

Although, one alternative solution djohe suggested is to have Sonic flash while he still has stars so there wouldn't be an extension to Sonic's invincibility. While I'm yet to test it as of writing, once I attempt to add it successfully, I'll update the post.

 

(bump; sorry)
This is more of a personal preference, but the other method that I did was putting the music loader under "Title_ChkLevSel" after the checks for the level select code and when button A is pressed. This was based on a method that was done in the Sonic 2 Simon Wai beta.

For reference:

Code:

Title_ChkLevSel:
        tst.b    ($FFFFFFE0).w    ; check    if level select    code is    on
        beq.w    PlayLevel    ; if not, play level
        btst    #6,($FFFFF604).w ; check if A is pressed
        beq.w    PlayLevel    ; if not, play level
        move.b  #$XX,d0    ; "XX" is the ID number of the music you want to play
        bsr.w   PlaySound   ; play music
        moveq    #2,d0
        bsr.w    PalLoad2    ; load level select pallet
        lea    ($FFFFCC00).w,a1
        moveq    #0,d0
        move.w    #$DF,d1

But yes, any of those you've mentioned above will also work.

 

@JGamer2151 everyone has their own methods)

 

@EddyTF True. The location is up to the individual, anywhere near the level select code.

 

HOW TO MAKE THE LEVEL SELECT APPEAR WITHOUT THE CODE
well to make this go to Tit_ChkLevSel

Code:

Tit_ChkLevSel:
        tst.b    (f_levselcheat).w ; delete this
        beq.w    PlayLevel    ; delete this
        btst    #bitA,(v_jpadhold1).w ; delete this
        beq.w    PlayLevel    ; delete this
        jmp Level_Select_Menu ; add this if you followed this guide: https://info.sonicretro.org/SCHG_How-to:Port_Sonic_2_Level_Select_to_Sonic_1
        moveq    #palid_LevelSel,d0
        bsr.w    PalLoad2    ; load level select palette
        lea    (v_hscrolltablebuffer).w,a1
        moveq    #0,d0
        move.w    #$DF,d1

​

and done well its a really short tutorial but i didint see people making tutorials about this and is a little bit difficult to know how to not mess up every thing so uh well bye!

 

can you give me the dissasembly link?

 

It would've been helpful if you just do a Google search on "sonic 1 disassembly" and saw a GitHub repo or a link redirecting you to a list of disassemblies on Retro. Seeing as you asked nicely, click me to access the disassembly

However, next time, it would've been better to do your research before immediately jumping to conclusions as it would've saved a lot of time on your end.

 

no. i tried every sonic 2 beta 4 dissasembly but i couldnt find the labels. please give me the dissasembly you used

 

hey. when i tried to to the a button tutorial. i get an error at line 32792. its the blocks that pick eggman up.

 

You don't need to use another disassembly in order to implement this behaviour. Heck, I didn't even look at S2B4's disassembly to implement said behaviour. It was just luck after playing around with Sonic 1's code.

It's only commenting out a few lines, you don't need to go through a barely documented disassembly in order to implement it. I clearly stated if you want to implement that feature in Sonic 1 implying that you should use a Sonic 1 disassembly like the link I sent you. Please re-read what I said next time and stop making things complicated for yourself.

EDIT:

It would be helpful if you show us the line specifically which will make things easier for us to lend you a hand.

 

oh! i see. sorry

also.i thought this was the tutorial to fix the camera.

 

This doesn't give us sufficient information to help you. Once you regain posting privileges, I'd appreciate knowing in more detail what error(s) you're getting when assembling. Please provide the contents of your errors log.

 

How to change sonics top speed (Sonic 1 github)
THIS DOESNT WORK ON HIVEBRAIN ONLY ON GITHUB!
Okay so lets begin first in the root of the disasembly open the file named "Sonic.asm" in a program like notepad (I will use notepad++ for this though).Now that you have opened the disasm you will search for the following code:

*move.w #$600,(v_sonspeedmax).w ; Sonic's top speed
Now that you have found the code change #$600 to for example to 800.
Now build and congrats! You have changed the speed of sonic!

NOTE:This does work on sonic 2 github and sonic 3 github but there are diffrent labels
I also have provided a download for a disasembly that alredy has changed speed so if you are lazy to do it yourself here then and a rom is provided too for people who want to play it (even though its just a speed change). Also no need to credit me.

 

Umm. It also works on hivebrain Disassembly as well. You just need to find the right equivalent line. Here, v_sonspeedmax is a named variable for Sonic's max speed basically. It's basically equals to $FFFFF760.
So, it'll be looking like this.
move.w #$600,($FFFFF760).w ;Sonic's Top Speed
But yeah, you can do it in hivebrain as well. Just need to know what ram is it equating to.

 

You can also change the acceleration and deceleration

 

@Grosy perhaps you haven't told me everything. In addition to the basic speed, you can change the speed of speed shoes. I will take GitHub as a basis. So, you need to open 2E Monitor Content Power-Up in _incObj folder. Find Pow_ChkShoes and there you can see this line:

Code:

move.w    #$C00,(v_sonspeedmax).w ; change Sonic's top speed

And you can set any speed. For example, #$300 and you will get slow shoes lol

But wait! After the expiration of the Speed Shoes time, you will get the previous speed of 600, out of order. We need to correct this misunderstanding.

Go in Sonic Display (incObj folder ) and we need to find it:

Code:

move.w    #$600,(v_sonspeedmax).w ; restore Sonic's speed

You need to replace this with your speed.

And I haven't told you everything yet. Next, figure it out for yourself.

 

Ok so i didnt know that until right now

 

How to disable Time Overs on the Sonic 1 GitHub Disassembly!

It's actually a really simplistic thing to do, too! All you need to do is comment out three lines found in /_inc/HUD Update.asm on the TimeOver label!

Code:

TimeOver:
        clr.b    (f_timecount).w
;        lea    (v_player).w,a0 ;Comment out the following lines...
;        movea.l    a0,a2
;        bsr.w    KillSonic
;        move.b    #1,(f_timeover).w ;Until the move.b the sets the timeover flag. --B.T.H (Keep the rts, though.)
        rts    

Now you can explore levels for more than 10 minutes at a time, because you've essentially removed the function that kills Sonic upon the 10 minute mark!