Keen: Modding

Code: Select all

%ext ck1
%version 1.31


#Skip diagonal-key checking - make room
%patch $55EF $EB $4A          #jmp short 0x563B

#Jump to offset
%patch $3E52 $E9 $179CW	#jmp near 55F1

#Recoil Code
%patch $55F1 $56              #push si
%patch $55F2 $57              #push di
%patch $55F3 $BE $0030W       #mov si, RECOIL_RAMPDOWN (keen_pos_x)
%patch $55F6 $BF $0200W       #mov di, RECOIL (delta_x) #keen is moved RECOIL/100h pixels the frame after firing
%patch $55F9 $A1 $604CW       #mov ax, keen_facing (word_1909C)
%patch $55FC $3D $0000W       #cmp ax, word 0x0
%patch $55FF $7E $04          #jle short (+4)
%patch $5601 $F7 $DE          #neg si
%patch $5603 $F7 $DF          #neg di
%patch $5605 $89 $36 $8240W   #mov [keen_pos_x], si
%patch $5609 $89 $3E $823CW   #mov [delta_x], di
%patch $560D $5F              #pop di
%patch $560E $5E              #pop si
%patch $560F $83 $C4 $08      #add sp, byte 0x8 (patched over this instruction at $3E52)
%patch $5612 $E9 $E840W       #jmp near 3e55

#Wait time after shooting 
%patch $3E6A 1E		#sprite_sync value

Code: Select all

%ext ck1
%version 1.31

#Give Keen's gun recoil:
%patch $55EF $EB $4A     #Make room
%patch $3E6A $1E         #Wait time after shot (Make larger for larger recoil)
%patch $3E52 $E9 $9C $17
%patch $55F1 $56 $57
             $BE $30 $00 #Recoil amount
             $BF $00 $02 
             $A1 $4C $60 $3D $00 $00 $7E $04 $F7 $DE $F7 $DF $89 $36
             $40 $82 $89 $3E $3C $82 $5F $5E $83 $C4 $08 $E9 $40 $E8