Gau's Rage 75%

Do you know how to edit Gau's Rage from 50-50 to 75-25? 

The odd 50% suck but I do not want 100% because it kinda fit the theme from other characters command chances like Umaro, Relm & Mog.

Yes, if you know ASM, you can do it by rewriting this section of code, which is basically a coinflip.

Code:

C2/0600: 20 53 4B     JSR $4B53      (random: 0 or 1 in Carry flag)
C2/0603: C2 30        REP #$30
C2/0605: 2A           ROL
C2/0606: AA           TAX            (X: 0 or 1)
C2/0607: E2 20        SEP #$20       (Set 8-bit Accumulator)
C2/0609: BF 00 46 CF  LDA $CF4600,X  (load Rage move)
C2/060D: 28           PLP
C2/060E: FA           PLX
C2/060F: 60           RTS

If you have no idea how to do it you can test this code with xkas 0.06. Note that you'll need to change the org $C26469 to actual free space in bank $C2 if that space is occupied by patches. This code is untested.

Code:

hirom
;header

org $C20600
jsr sub_rage      ; get good index
tax               ; transfer rage/attack index to X
sep #$20          ; 8-bit accumulator
lda $CF4600,X     ; load rage/attack
plp
plx
rts

org $C26469       ; change to free space in bank $C2
sub_rage:
pha               ; save monster index
jsr $4B5A         ; random number between 0 and 255
cmp #$40          ; compare to 64
bcc is_attack     ; branch if smaller than 64
; rage (75%)
pla               ; restore monster index
rep #$30          ; 16-bit accumulator/index
asl a             ; multiply by 2
inc a             ; increment by 1
bra exit          
is_attack:
; attack (25%)
pla               ; restore monster index
rep #$30          ; 16-bit accumulator/index
asl a             ; multiply by 2
exit:
rts

Yes, if you know ASM, you can do it by rewriting this section of code, which is basically a coinflip.

Code:

C2/0600: 20 53 4B     JSR $4B53      (random: 0 or 1 in Carry flag)
C2/0603: C2 30        REP #$30
C2/0605: 2A           ROL
C2/0606: AA           TAX            (X: 0 or 1)
C2/0607: E2 20        SEP #$20       (Set 8-bit Accumulator)
C2/0609: BF 00 46 CF  LDA $CF4600,X  (load Rage move)
C2/060D: 28           PLP
C2/060E: FA           PLX
C2/060F: 60           RTS

And to not make it a coin flip but 75-25?

Put two coinflips in. Flip coin: if 0, pick move 1. If 1, flip coin: if 0, pick move 1, if 1, pick move 2. Not sure if that's the *easiest* way to go about it because I'm not familiar with assembly, but I suspect the building blocks are already there to make 75/25 happen.

The easiest way is to replace the coin flip with a call to the RNG function at $C24B5A to draw a random number 0..255, then compare it to 64 for a 75% chance to set the carry flag.

Edit: just do this

Code:

;header
!freespace = $c2a65a

org $c20600
jsr newfunc

org !freespace
newfunc:
sep #$20
jsr $4b5a
cmp #$40
rep #$20
rts

Copy the above code into notepad, save it as something.asm and look up on Youtube how to apply an ASM patch using xkas.

The easiest way is to replace the coin flip with a call to the RNG function at $C24B5A to draw a random number 0..255, then compare it to 64 for a 75% chance to set the carry flag.

Edit: just do this

Code:

;header
!freespace = $c2a65a

org $c20600
jsr newfunc

org !freespace
newfunc:
sep #$20
jsr $4b5a
cmp #$40
rep #$20
rts

Copy the above code into notepad, save it as something.asm and look up on Youtube how to apply an ASM patch using xkas.

Rage does become 75-25 happened. However Gau keep using different attacks. Did you notice? And any idea why it happened?

ah, A needs to be preserved surrounding the "jsr $4b5a / cmp #$40".

and can the "sep #$20" and "rep #$20" be chucked to save space?

ah, A needs to be preserved surrounding the "jsr $4b5a / cmp #$40".

and can the "sep #$20" and "rep #$20" be chucked to save space?

Sorry but I don't get it. What do you mean "Preserved" and "chucked"? 

You mean like this? 

header
!freespace = $c2a65a

org $c20600
jsr newfunc

org !freespace
newfunc:
jsr $4b5a
cmp #$40
rts


or like this?


header
!freespace = $c2a65a

org $c20600
jsr newfunc

org !freespace
newfunc:
sep #$20
jsr $4b5a/cmp #$40
rep #$20
rts

I think he meant something like this:

Code:

org !freespace
newfunc:
pha
jsr $4b5a
cmp #$40
pla
rts