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04-26-24 01:25 AM |
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| 0 users currently in ROM Hacking | 2 guests |
| Main - ROM Hacking - Multi-Directional Fireball Throwing | New thread | New reply |
| RetroRain |
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 Fuzz Ball Level: 66 Posts: 81/994 EXP: 2438109 Next: 23742 Since: 09-30-07 Last post: 1934 days Last view: 957 days |
I want to add a new feature to Dark Mario; Multi-Directional Fireball Throwing, similar to what Bass does in Megaman & Bass. I was wondering if I could get some tips or advice on what do. Here is my take on it:
1. We need to find the code that is executed when you have firepower and press the button to shoot a fireball. Nothing that the Trace Logger couldn't do. $AB68:A5 D8 LDA $D8 = #$00 $AB6A:0D 45 05 ORA $0545 = #$00 $AB6D: D0 09 BNE $AB78 $AB6F:A5 02 LDA $02 = #$00 $AB71:C9 28 CMP #$28 $AB73:30 03 BMI $AB78 $AB78:A0 28 LDY #$28 $AB7A:AD DD 03 LDA $03DD = #$00 $AB7D:C9 7F CMP #$7F $AB7F: D0 02 BNE $AB83 (10 lines skipped) $ABA2:C8 INY $ABA3:C8 INY $ABA4:C8 INY $ABA5:C8 INY (2029 lines skipped) $A265:20 AF A2 JSR $A2AF Go down more in the log $A2AF:A2 01 LDX #$01 $A2B1: BD E1 7C LDA $7CE1,X @ $7CE2 = #$00 $A2B4:F0 04 BEQ $A2BA $A2BA:AD F1 04 LDA $04F1 = #$00 $A2BD:09 20 ORA #$20 $A2BF:8D F1 04 STA $04F1 = #$00 $A2C2:A9 0B LDA #$0B $A2C4:8D 13 05 STA $0513 = #$00 I have noticed by doing a write to $513, that a different bank is switched in temporarily, to handle the fireball routine code. 2. Pseudo-code. - Check to make sure Up or Down is being held. - Branch to proper location depending on which is being held down. - Fire ball goes up/down (I don't know how to do this) - Otherwise Fireball goes normally like it always does. 3. Technical Pseudo-code. LDA $17 ; Select RAM Address 17 (Buttons held down) CMP #$08 ; Compare it to 08 (Up) BEQ ; If true, branch to an area where I can carry out my code CMP #$04 ; Compare it to 04 (Down) BEQ ; If true, branch to an area where I can carry out my code - Otherwise Regular Fireball code here - I don't know how to carry out the direction of the fireball (Up/Down) I might have to figure most of this out on my own, but if you have any better Pseudo-code, or any tips on how to go about this, I would appreciate it. Thanks. ____________________ My YouTube Channel |
| Main - ROM Hacking - Multi-Directional Fireball Throwing | New thread | New reply |
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