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Merge pull request #606 from ISSOtm/patch-1

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Correct some bugfixes, add some compatibility extensions
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Rangi 2019-03-03 17:30:58 -05:00 committed by GitHub
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1 changed files with 25 additions and 9 deletions
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docs/bugs_and_glitches.md
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@ -89,6 +89,7 @@ Some fixes are mentioned as breaking compatibility with link battles. This can b
+ ld a, HIGH(MAX_STAT_VALUE)
+ cp h
+ jr c, .cap
+ ret nz
+ ld a, LOW(MAX_STAT_VALUE)
+ cp l
+ ret nc
@ -126,6 +127,7 @@ Some fixes are mentioned as breaking compatibility with link battles. This can b
+ ld a, HIGH(MAX_STAT_VALUE)
+ cp b
+ jr c, .cap
+ ret nz
+ ld a, LOW(MAX_STAT_VALUE)
+ cp c
+ ret nc
@ -166,7 +168,7 @@ This bug existed for all battles in Gold and Silver, and was only fixed for sing
## Moves with a 100% secondary effect chance will not trigger it in 1/256 uses
*Fixing this bug will break compatibility with standard Pokémon Crystal for link battles.*
*Fixing this bug **may** break compatibility with standard Pokémon Crystal for link battles.*
([Video](https://www.youtube.com/watch?v=mHkyO5T5wZU&t=206))
@ -175,24 +177,38 @@ This bug existed for all battles in Gold and Silver, and was only fixed for sing
```diff
- ; BUG: 1/256 chance to fail even for a 100% effect chance,
- ; since carry is not set if BattleRandom == [hl] == 255
- call BattleRandom
+ ld a, [hl]
+ cp 100 percent
+ jr z, .ok
call BattleRandom
+ sub 100 percent
+ ; If chance was 100%, RNG won't be called (carry not set)
+ ; Thus chance will be subtracted from 0, guaranteeing a carry
+ call c, BattleRandom
cp [hl]
- pop hl
- ret c
+ jr c, .ok
pop hl
ret c
.failed
ld a, 1
ld [wEffectFailed], a
and a
+.ok
+ pop hl
ret
```
**Compatibility preservation:** If you wish to keep compatibility with standard Pokémon Crystal, you can disable the fix during link battles by also applying the following edit in the same place:
```diff
+ ld a, [wLinkMode]
+ cp LINK_COLOSSEUM
+ scf ; Force RNG to be called
+ jr z, .nofix ; Don't apply fix in link battles, for compatibility
ld a, [hl]
sub 100 percent
; If chance was 100%, RNG won't be called (carry not set)
; Thus chance will be subtracted from 0, guaranteeing a carry
+.nofix
call c, BattleRandom
```
## Belly Drum sharply boosts Attack even with under 50% HP
*Fixing this bug will break compatibility with standard Pokémon Crystal for link battles.*