The S Monitor, WITHOUT level Editing! Tutorial.

Did you know that there was i guide for restoring the S monitor? Well, This is sort of like it. Instead of inserting an entire new monitor, without level editing, you can restore it, but you have to replace an old monitor.

Ill show you how i did it.

First, I Opened My sonic1.asm and i went to the invincible monitor subroutine (Obj2E_ChkInvinc:)

I Saw this:

Code:

Obj2E_ChkInvinc:
      cmpi.b   #5,d0      ; does monitor contain invincibility?
      bne.s   Obj2E_ChkRings
      move.b   #1,($FFFFFE2D).w ; make   Sonic invincible
      move.w   #$4B0,($FFFFD032).w ; time limit for the power-up
      move.b   #$38,($FFFFD200).w ; load stars   object ($3801)
      move.b   #1,($FFFFD21C).w
      move.b   #$38,($FFFFD240).w ; load stars   object ($3802)
      move.b   #2,($FFFFD25C).w
      move.b   #$38,($FFFFD280).w ; load stars   object ($3803)
      move.b   #3,($FFFFD29C).w
      move.b   #$38,($FFFFD2C0).w ; load stars   object ($3804)
      move.b   #4,($FFFFD2DC).w
      tst.b   ($FFFFF7AA).w   ; is boss mode on?
      bne.s   Obj2E_NoMusic   ; if yes, branch
      move.w   #$87,d0
      jmp   (PlaySound).l   ; play invincibility music

and i also looked at the Sonic Speed Shoes Monitor Subroutine:Obj2E_ChkShoes:

Code:

Obj2E_ChkShoes:
      cmpi.b   #3,d0      ; does monitor contain speed shoes?
      bne.s   Obj2E_ChkShield
      move.b   #1,($FFFFFE2E).w ; speed up the   BG music
      move.w   #$4B0,($FFFFD034).w ; time limit for the power-up
      move.w   #$C00,($FFFFF760).w ; change Sonic's top speed
      move.w   #$18,($FFFFF762).w
      move.w   #$80,($FFFFF764).w
      move.w   #$E2,d0
      jmp   (PlaySound).l   ; Speed   up the music

i Saw that in the Speed shoes Subroutine, the top speed. What i did was copy it, and paste it under this line in Obj2E_ChkInvinc:

Code:

      move.b   #4,($FFFFD2DC).w

That way, when i break the monitor, it will also make sonic speed up to the Shoes Speed. But, THe S Monitor requires Higher Speed. Super Sonic Speeds

So, i edited this line:

Code:

      move.w   #$C00,($FFFFF760).w ; change Sonic's top speed

to the Super Sonic Speed from Sonic 2 (around 900)

And as Expected, I Built, and it worked. However, I Did not like how the acceleration/deceleration (how fast you start out) Worked, So, I Went to Sonic's main subroutine, Obj01_Main:

Code:

Obj01_Main:            ; XREF: Obj01_Index
      addq.b   #2,$24(a0)
      move.b   #$13,$16(a0)
      move.b   #9,$17(a0)
      move.l   #Map_Sonic,4(a0)
      move.w   #$780,2(a0)
      move.b   #2,$18(a0)
      move.b   #$18,$19(a0)
      move.b   #4,1(a0)
      move.w   #$600,($FFFFF760).w ; Sonic's top speed
      move.w   #$C,($FFFFF762).w ; Sonic's acceleration
      move.w   #$80,($FFFFF764).w ; Sonic's deceleration

The Acceleration/Deceleration stayed the same when i open the Invincible monitor. SO, I Copied/Pasted These:

Code:

      move.w   #$C,($FFFFF762).w ; Sonic's acceleration
      move.w   #$80,($FFFFF764).w ; Sonic's deceleration

into the invincible monitor subroutine, Obj2E_ChkInvinc

Code:

Obj2E_ChkInvinc:
      cmpi.b   #5,d0      ; does monitor contain invincibility?
      bne.s   Obj2E_ChkRings
      move.b   #1,($FFFFFE2D).w ; make   Sonic invincible
      move.w   #$4B0,($FFFFD032).w ; time limit for the power-up
      move.b   #$38,($FFFFD200).w ; load stars   object ($3801)
      move.b   #1,($FFFFD21C).w
      move.b   #$38,($FFFFD240).w ; load stars   object ($3802)
      move.b   #2,($FFFFD25C).w
      move.b   #$38,($FFFFD280).w ; load stars   object ($3803)
      move.b   #3,($FFFFD29C).w
      move.b   #$38,($FFFFD2C0).w ; load stars   object ($3804)
      move.b   #4,($FFFFD2DC).w
      move.w   #$930,($FFFFF760).w ; change Sonic's top speed
      move.w   #$C,($FFFFF762).w ; Sonic's acceleration
      move.w   #$80,($FFFFF764).w ; Sonic's deceleration
      tst.b   ($FFFFF7AA).w   ; is boss mode on?
      bne.s   Obj2E_NoMusic   ; if yes, branch
      move.w   #$87,d0
      jmp   (PlaySound).l   ; play invincibility music

I edited the Acceleration/Deceleration to 1E (Acceleration) and 30 (Deceleration)

I saved my Sonic1.asm and compiled it, having perfect results.
Enjoy Your S Monitor!
Don't ask me how to change the Monitor image to the S monitor image, because i don't yet.
When i Figure it out, Ill be sure to share it!

EDIT: Ive Decided to make this a copy/paste thing so here.

Go to Obj2E_ChkInvinc and replace the entire thing with this:

Code:

Obj2E_ChkInvinc:
          cmpi.b  #5,d0      ; does monitor contain invincibility?
          bne.s  Obj2E_ChkRings
          move.b  #1,($FFFFFE2D).w ; make  Sonic invincible
          move.w  #$4B0,($FFFFD032).w ; time limit for the power-up
          move.b  #$38,($FFFFD200).w ; load stars  object ($3801)
          move.b  #1,($FFFFD21C).w
          move.b  #$38,($FFFFD240).w ; load stars  object ($3802)
          move.b  #2,($FFFFD25C).w
          move.b  #$38,($FFFFD280).w ; load stars  object ($3803)
          move.b  #3,($FFFFD29C).w
          move.b  #$38,($FFFFD2C0).w ; load stars  object ($3804)
          move.b  #4,($FFFFD2DC).w
          move.w  #$A00,($FFFFF760).w ; change Sonic's top speed
          move.w  #$30,($FFFFF762).w ; Sonic's acceleration
          move.w  #$100,($FFFFF764).w ; Sonic's deceleration
          tst.b  ($FFFFF7AA).w  ; is boss mode on?
          bne.s  Obj2E_NoMusic  ; if yes, branch
          move.w  #$87,d0
          jmp  (PlaySound).l  ; play invincibility music

Man, that was boring to do. That's why i started doing it to where you learn something, but if you dont want to, use the code above.

Also, If anyone could tell me how to make him jump higher when the box is broken, and how to make it subtract one ring per second, it would be appreciated. Thanks.

Pretty nice!

Thanks! If you have any tips for me, go on and tell me!

EDIT: Found a bug i dont know how to fix. When the Power time is over, it looks like everything is back to normal, but you still have the same speed, acceleration,and deceleration as when you have broken the monitor.

calebjhuhlu wrote:Found a bug i dont know how to fix. When the Power time is over, it looks like everything is back to normal, but you still have the same speed, acceleration,and deceleration as when you have broken the monitor.

You Should point for monitor that if time limit is ended, restore sonic's speed\accerelation\deceleration.

But you might want to use ''s'' monitor instead...
Just found out quide for it on sonicretro

Just an annual year bump!