Posts by BigJohnBoy

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Please chime in on a proposed restructuring of the ROM hacking sections.

05-07-24 06:39 AM

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BigJohnBoy

Posted on 01-29-10 01:37 AM, in 6502 ASM freespace, banks, and stuff

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Well, I'm getting around to trying an ASM hack for SMB3 NES. I have a small code which will change the music. (I'm using JaSp's music tool) The hijack will need to take place at 0x0007C8F7(PC). And all I need is to insert a JSR there. The problem is I have no idea which banks are which and all that. The major question here is what do I need to do to calculate the offset to JSL to? (Or I may not be using the right freespace areas, I really don't know)

The simple code I wanted to put into freespace:
LDA #$22
STA $04F5
RTS

BigJohnBoy

Posted on 01-29-10 02:09 AM, in 6502 ASM freespace, banks, and stuff (rev. 2 of 01-29-10 02:14 AM)

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Eh, somewhere along the music inserting process the rom became expanded 640kb. And, I also screwed, the offset (which is surronded mostly by 0's) is 422FE according to Hex Workshop. Also I've heard that there has to be some kind of converting to get the PC address to CPU or something, does that even apply here?

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