Port Sonic 2 Level Select to Sonic 1
From Sonic Retro
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(Guide by User:DelayHacks)
You need to download level select by Esrael:
Download Sonic 2 Level Select in Sonic 1
File: s2menu.rar (29 kB) (info)
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and extract it to the root of your dissassembly.
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
Also, go to "_inc\Pallet pointers.asm" and under this:
dc.l Pal_Ending
dc.w $FB00
dc.w $1F
paste this:
dc.l Menu_Palette; pallet address
dc.w $FB00 ; RAM address
dc.w $1F ; (pallet length / 2) - 1
now you have real Sonic 2's level select pallet. 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. 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 texts in level select. To edit "debug mode" code go to label "Code_Debug_Mode:". To edit "all emeralds" code go to label "Code_All_Emeralds:" Thats all. All permissions for this level select code goes to Esrael. Result: