Difference between revisions of "Sonic the Hedgehog CD/MMD Tweaking"
From Sonic Retro
(→Invincibility duration time: Dammit I always miss something obvious) |
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− | Here are some locations in | + | __NOTOC__ |
+ | {{SCHG SCD}} | ||
+ | Here are some locations in a European Sonic CD level MMD which contain tweakable code (in [[Motorola 68000]] assembly). | ||
==Maximum rings allowed== | ==Maximum rings allowed== | ||
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move.w d1,($FF1512).l ; Move d1 back to the address where the number of rings is at</asm> | move.w d1,($FF1512).l ; Move d1 back to the address where the number of rings is at</asm> | ||
− | == | + | ==Minimum rings for Giant Ring== |
<asm>$D50C: | <asm>$D50C: | ||
cmpi.w #$32,($FF1512).l ; Compare 50 with the number of rings | cmpi.w #$32,($FF1512).l ; Compare 50 with the number of rings | ||
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jmp sub_20788C ; Otherwise jump here</asm> | jmp sub_20788C ; Otherwise jump here</asm> | ||
− | == | + | ==Rings given by ring== |
+ | <asm>$9F1A: | ||
+ | addq.w #1,($FF1512).l ; Add 1 to number of rings</asm> | ||
+ | |||
+ | ==Rings given by Ring Monitor== | ||
<asm>$A88E: | <asm>$A88E: | ||
addi.w #$A,($FF1512).l ; Add 10 to the current number of rings</asm> | addi.w #$A,($FF1512).l ; Add 10 to the current number of rings</asm> | ||
− | ==Invincibility duration | + | ==Invincibility duration== |
<asm>$A8F8: | <asm>$A8F8: | ||
move.b #1,($FF151F).l ; Enable invicibility | move.b #1,($FF151F).l ; Enable invicibility | ||
move.w #$4B0,($FFFFD032).w ; Set the invincibility duration time to $4B0</asm> | move.w #$4B0,($FFFFD032).w ; Set the invincibility duration time to $4B0</asm> | ||
− | ==Super Sneakers duration | + | ==Super Sneakers duration== |
<asm>$A95A: | <asm>$A95A: | ||
move.b #1,($FF1520).l ; Enable super sneakers | move.b #1,($FF1520).l ; Enable super sneakers | ||
move.w #$4B0,($FFFFD034).w ; Set the super sneakers duration time to $4B0</asm> | move.w #$4B0,($FFFFD034).w ; Set the super sneakers duration time to $4B0</asm> | ||
− | == | + | ==Regular speed stats== |
<asm>$4082: | <asm>$4082: | ||
move.w #$600,($FFFFF760).w ; Maximum velocity | move.w #$600,($FFFFF760).w ; Maximum velocity | ||
− | move.w #$C,($FFFFF762).w ; Maximum | + | move.w #$C,($FFFFF762).w ; Maximum acceleration</asm> |
− | == | + | ==Super Sneakers speed stats== |
<asm>$A968: | <asm>$A968: | ||
move.w #$C00,($FFFFF760).w ; Set maximum velocity to $C00 | move.w #$C00,($FFFFF760).w ; Set maximum velocity to $C00 | ||
− | move.w #$18,($FFFFF762).w ; Set maximum | + | move.w #$18,($FFFFF762).w ; Set maximum acceleration to $18</asm> |
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{{SCHGuides}} | {{SCHGuides}} | ||
[[Category:Sonic Community Hacking Guide]] | [[Category:Sonic Community Hacking Guide]] |
Revision as of 12:36, 31 August 2008
SCHG: Sonic the Hedgehog CD |
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Main Article |
File Locations |
File Locations |
Art Editing |
Editing Art |
MMD Tweaking |
Tweaking MMDs |
RAM Editing |
RAM Editing |
Here are some locations in a European Sonic CD level MMD which contain tweakable code (in Motorola 68000 assembly).
Maximum rings allowed
<asm>$AEFA: move.w ($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 $3E7 (999) into d1 move.w d1,($FF1512).l ; Move d1 back to the address where the number of rings is at</asm>
Minimum rings for Giant Ring
<asm>$D50C: cmpi.w #$32,($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</asm>
Rings given by ring
<asm>$9F1A: addq.w #1,($FF1512).l ; Add 1 to number of rings</asm>
Rings given by Ring Monitor
<asm>$A88E: addi.w #$A,($FF1512).l ; Add 10 to the current number of rings</asm>
Invincibility duration
<asm>$A8F8: move.b #1,($FF151F).l ; Enable invicibility move.w #$4B0,($FFFFD032).w ; Set the invincibility duration time to $4B0</asm>
Super Sneakers duration
<asm>$A95A: move.b #1,($FF1520).l ; Enable super sneakers move.w #$4B0,($FFFFD034).w ; Set the super sneakers duration time to $4B0</asm>
Regular speed stats
<asm>$4082: move.w #$600,($FFFFF760).w ; Maximum velocity move.w #$C,($FFFFF762).w ; Maximum acceleration</asm>
Super Sneakers speed stats
<asm>$A968: move.w #$C00,($FFFFF760).w ; Set maximum velocity to $C00 move.w #$18,($FFFFF762).w ; Set maximum acceleration to $18</asm>