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Acmlm's Board - I2 Archive - Super Mario World hacking - Tonight on "things that shouldn't be so flippin' complicated" | |
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HyperLamer
<||bass> and this was the soloution i thought of that was guarinteed to piss off the greatest amount of people

Sesshomaru
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Since: 03-15-04
From: Canada, w00t!
LOL FAD

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Posted on 03-28-05 03:04 PM Link | Quote
Spawning fireballs. How do you do it? All this is doing is setting X to one and playing fireball sounds:

LDX #1
LDA $1714 ;Check fireball 1
BEQ fireball
DEX
LDA $1713 ;Check 2
BNE end

fireball:
LDY #$20
STY $C100 ;Unused
LDA #5
STA $1713,X ;Enable fireball
LDA $96
STA $171D,X ;Y pos (low)
LDA $97
;CLC
;ADC $C100
STA $1731,X ;Y pos (high)
LDA $94
STA $173B,X ;X pos (low)
LDA $95
STA $1727,X ;X pos (high)
STZ $1745,X ;Y speed
LDA #6
STA $174F,X ;X speed
;LDA #6
STA $1DFC ;Sound
Kario

In Possession of a Stolen Shovel

Level: 65

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Since: 03-15-04
From: Texas... Yeehaw!

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Posted on 03-28-05 03:08 PM Link | Quote
You flippin took my word.

Good find btw.
HyperLamer
<||bass> and this was the soloution i thought of that was guarinteed to piss off the greatest amount of people

Sesshomaru
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LOL FAD

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Posted on 03-29-05 04:02 AM Link | Quote
Well, I found the game's fireball subroutine - $FEA8 (called from $D0AA when you shoot), but there's a bit of a problem. You have to JSR to it, which isn't exactly possible outside of bank 00. Anyone know how I can use it? Hopefully I can stick a small chunk of code in the bank to handle it, but maybe someone knows a better way...

Also anyone know how to move the sprite layer? I've got a level set up where Mario stays still and layer 2 moves; problem is, the sprites don't move with it because Mario's technically still in the same place.

[edit] Could you do 'JSR $1234' to jump to whatever address $1234 points to? I know some other instructions can do it... Also is it necessary to use JSL when calling code in RAM from bank 0?

(edited by HyperHacker on 03-28-05 06:05 PM)
(edited by HyperHacker on 03-28-05 06:13 PM)
HabsoluteFate

Red Paratroopa
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From: Ottawa, Ontario, Canada

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Posted on 03-29-05 04:25 AM Link | Quote
Originally posted by HyperHacker
Well, I found the game's fireball subroutine - $FEA8 (called from $D0AA when you shoot), but there's a bit of a problem. You have to JSR to it, which isn't exactly possible outside of bank 00. Anyone know how I can use it? Hopefully I can stick a small chunk of code in the bank to handle it, but maybe someone knows a better way...

Also anyone know how to move the sprite layer? I've got a level set up where Mario stays still and layer 2 moves; problem is, the sprites don't move with it because Mario's technically still in the same place.

[edit] Could you do 'JSR $1234' to jump to whatever address $1234 points to? I know some other instructions can do it... Also is it necessary to use JSL when calling code in RAM from bank 0?


The fireball sub routine is currently used by both Fire Mario and Yoshi. they jump into the sub routine at different locations. Here are some notes of mine when i was working on my new power up...i totally changed the design midway so the following code is rough notes:


$00/FEA8 22 EC F7 0F	JSR $0FF7EC	; Jump to new fireball Sub Routine
$00/FEAC C9 00		CMP #$00	; Compare Fireball are we done flag with 0
$00/FEAE D0 05		BNE $FEB5
$00/FEA0 60		RTS
$00/FEB1 EA		NOP
$00/FEB2 EA		NOP
$00/FEB3 EA		NOP
$00/FEB4 EA		NOP

$0F/F7EC	A5 19	LDA $19
$0F/F7EE	C9 03	CMP #$03
$0F/F7F0	D0 12	BNE $CapeFireMario
FireMario:
$0F/F7F2	A2 09		LDX #$09
Redo:
$0F/F7F4	BD 0B 17	LDA $170B,x
$0F/F7F7	F0 08		BEQ ExitMario
$0F/F7F9	CA		DEX
$0F/F7FA	E0 07		CPX #$07
$0F/F7FC	D0 F6		BNE $F7F4 (Redo)
$0F/F7FE	A9 00		LDA #$00	; Flag that we are done
$0F/F800	6B		RTL
ExitMario:
$0F/F801	A9 01		LDA #$01	; Flag that we are not done
$0F/F803	6B		RTL
CapeFireMario:
$0F/F804	A9 00		LDA #$00	; Flag that we are done
$0F/F806	EA		NOP		; Replace these 4 EAs with a Jump Long to Yoshi SubRoutine later on
$0F/F807	EA		NOP
$0F/F808	EA		NOP
$0F/F809	EA		NOP
$0F/F80A	6B		RTL		; Return

Makes "ThrowYoshiFireballs" 
$02/A1A7 22 0B F8 0F		JSR $0FF80B
$02/A1AB EA			NOP
$0F/F80B BD 47 17		LDA $1747,x
$0F/F80E 29 80			AND #$80
$0F/F811 6B			RTL

Seems to be Start of Sub Routine For Collision between thong/fireballs with enemies
$02/A0B3 DA          PHX                     A:9F00 X:0005 Y:0000 P:envMXdiZc
Without this Yoshi's facial animation stops after shooting fireballs
$01/EFEE A9 2A       LDA #$2A                A:0003 X:0008 Y:00D0 P:envMXdiZC
This code seems to increase the fireball size:
$02/9F71 A5 14       LDA $14    [$00:0014]   A:9F00 X:0007 Y:002B P:envMXdizc
This is the code that actually throws the fireballs
$02/A1A4 BC 53 A1    LDY $A153,x[$02:A15A]   A:9F03 X:0007 Y:0000 P:envMXdizc



warning: This code probably does not work and probably isnt very efficient

Edit:
I'm going to introduce a program soon that will allow moving of entire sub routines from one location to another..which should make things easier...i needed something like that anyways for my power up stuff. the program will also allow import/export of ASM code that way you can export a block of code, make edits, and import that block of code (although since odds are it wouldnt fit in the original location you will have to move that code somewhere else)...i'll keep you guys posted once its completed and tested

(edited by HabsoluteFate on 03-28-05 06:28 PM)
HyperLamer
<||bass> and this was the soloution i thought of that was guarinteed to piss off the greatest amount of people

Sesshomaru
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Posted on 03-29-05 05:28 AM Link | Quote
Originally posted by HabsoluteFate
$00/FEA8 22 EC F7 0F JSR $0FF7EC ; Jump to new fireball Sub Routine

Erm, how are you doing that? You JSR to a different bank.
And of course, there doesn't seem to be one free byte in bank 0. Way to waste space, Nintendo!

(edited by HyperHacker on 03-28-05 07:28 PM)
HabsoluteFate

Red Paratroopa
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Posted on 03-29-05 06:56 PM Link | Quote
Originally posted by HyperHacker
Originally posted by HabsoluteFate
$00/FEA8 22 EC F7 0F JSR $0FF7EC ; Jump to new fireball Sub Routine

Erm, how are you doing that? You JSR to a different bank.
And of course, there doesn't seem to be one free byte in bank 0. Way to waste space, Nintendo!

Op Code 22 can be interpretted as either JSL or JSR as far as what i have read...
"The JSL instruction is an alias for JSR long."
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