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Sonic the Hedgehog CD/MMD Tweaking

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Revision as of 09:04, 7 August 2008 by Shobiz (talk | contribs) (Major cleanup)

Here are some locations in an European Sonic CD level MMD which contain tweakable code (in 68k assembly).

  • Maximum rings allowed:
$AEFA:
	move.w  (word_FF1512).l,d1 ; Move number of rings into d1
	cmpi.w  #$3E8,d1        ; Compare $3E8 (1000) with d1 (number of rings)
	bcs.s   loc_20AF10      ; If the number of rings is < 1000, branch
	move.w  #$3E7,d1        ; Move $3E7 (999) into d1
	move.w  d1,(word_FF1512).l ; Move d1 back to the address where the number of rings is at
  • Lowest number of rings required to access the special stage:
$D50C:
	cmpi.w  #$32,(word_FF1512).l ; Compare 50 with the number of rings
	bcc.s   loc_20D51C      ; If number of rings >= 50, allow entrance to the special stage.
	jmp     sub_20788C      ; Otherwise jump here
  • Number of rings you get when you break the ring monitor:
$A88E:
	addi.w #$A,(word_FF1512).l ; Add 10 to the current number of rings


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