Port Sonic 2 Level Select to Sonic 1
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(Guide by DelayHacks)
You need to download the level select by Esrael:
Download Sonic 2 Level Select in Sonic 1
File: s2menu.rar (29 kB) (info)
|
and extract it to the root of your dissassembly.
Hivebrain's 2005 disassembly
Getting Level select in game
After downloading and extracting the file, go to the end of the main file (sonic1.asm) and you'll find this:
; end of 'ROM'
EndOfRom:
END
Add this line before it:
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
Open "_inc\Pallet pointers.asm" and after this:
dc.l Pal_Ending
dc.w $FB00
dc.w $1F
add this:
dc.l Menu_Palette; pallet address
dc.w $FB00 ; RAM address
dc.w $1F ; (pallet length / 2) - 1
Now you have Sonic 2's level select palette.
Now goto "s2menu.asm". See this line?
Level_Select_Menu_snd = $0081
Replace "81" with music you want in the level select (# of music + 80). See this line?
Emerald_Snd = $0093
and replace "93" with sound what you want after "All emeralds code". To edit ring sound after "debug mode" code, change B5 in this line:
Ring_Snd = $00B5
To edit texts, find label "Menu_Level_Select_Text:" and you see
dc.b $0E, _G, _R, _E, _E, _N, __, _H, _I, _L, _L, __, __, __, __, __
dc.b $0E, _L, _A, _B, _Y, _R, _I, _N, _T, _H, __, __, __, __, __, __
dc.b $0E, _M, _A, _R, _B, _L, _E, __, __, __, __, __, __, __, __, __
dc.b $0E, _S, _P, _R, _I, _N, _G, __, _Y, _A, _R, _D, __, __, __, __
dc.b $0E, _S, _T, _A, _R, __, _L, _I, _G, _H, _T, __, __, __, __, __
dc.b $0E, _S, _C, _R, _A, _P, __, _B, _R, _A, _I, _N, __, __, __, __
dc.b $0E, _F, _I, _N, _A, _L, __, __, __, __, __, __, __, __, __, __
dc.b $0E, _S, _P, _E, _C, _I, _A, _L, __, _S, _T, _A, _G, _E, __, __
dc.b $0E, _E, _N, _D, _I, _N, _G, __, _S, _E, _Q, _U, _E, _N, _C, _E
dc.b $0E, _S, _O, _U, _N, _D, __, _T, _E, _S, _T, __, __, _st,__, __
Now you can edit the text in the level select. To edit "debug mode" code go to the label "Code_Debug_Mode:". To edit "all emeralds" code go to label "Code_All_Emeralds:" That's all. All permissions for this level select code goes to Esrael. Result: