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SCHG How-to

Port Sonic 2 Level Select to Sonic 1

From Sonic Retro

Revision as of 07:30, 28 October 2017 by DelayHacks (talk | contribs)

Guide by DelayHacks. This is my first guide. You need to download level select by Esrael:

Download.svg Download Sonic 2 Level Select in Sonic 1
File: s2menu.rar (29 kB) (info)

and extract him to disassembly.


Getting Level select in game

After download and add to disassembly go to "sonic1.asm" and go to end and you see this

; end of 'ROM'
EndOfRom:


		END

add this line before "; end of 'ROM'"

         include 's2_menu.asm' ; Sonic 2 Level Select

now go to

Title_ChkLevSel:
		tst.b	($FFFFFFE0).w		; check	if level select	code is	on
		beq.w	PlayLevel		; if not, play level
		btst	#iA,(Joypad|Held).w	; check if A is held
		beq.w	PlayLevel		; if not, play level
		moveq	#2,d0
		bsr.w	PalLoad2		; load level select pallet
		lea	($FFFFCC00).w,a1
		moveq	#0,d0
		move.w	#$DF,d1

and replace with this

Title_ChkLevSel:
		tst.b	($FFFFFFE0).w		; check	if level select	code is	on
		beq.w	PlayLevel		; if not, play level
		btst	#iA,(Joypad|Held).w	; check if A is held
		beq.w	PlayLevel		; if not, play level
		jmp     Level_Select_Menu ; if yes, goto Sonic 2 level select	
		moveq	#2,d0
		lea	($FFFFCC00).w,a1
		moveq	#0,d0
		move.w	#$DF,d1

Other

To edit music in level select, go to "s2_menu.asm" and find:

Level_Select_Menu_snd   = $0081

replace "81" with music what you want in level select (# of music + 80). To edit sound after "all emeralds" code find:

Emerald_Snd             = $0093

and replace "93" with sound what you want. To edit ring sound after "debug mode" code find:

Ring_Snd                = $00B5

and replace "B5" with sound what you want. Thats all. All permissions for this level select code goes to Esrael.

S2LevelSelectS1.png
Result