Any Tips for MSU1 Hacking?

View previous topic View next topic Go down

Any Tips for MSU1 Hacking?

Post by ifrit05 on Wed 23 Sep 2015 - 14:23

Hey all. Anyone got any good sites or tutorials for hacking in MSU1 support for SNES games?

I'm not that good at debugging and/or assembly. I understand the basics of breakpoints and more technical stuff, I've dabbled in C a little so I'm not entirely lost in the coding aspect of things. I'd like to try to get at least one track to play on a game just to get a feel for it. I understand that it can be, and is, a time consuming process.

I just can't seem to get any good sources of information and how things should be set up. I would appreciate any help if possible.

If anything, I have ripped the OST from FFIV PSP version with proper loop points, so I can help there if anyone wants to do a FFIV/II project.

ifrit05
Newcomer

Since : 2015-09-23

Back to top Go down

Re: Any Tips for MSU1 Hacking?

Post by Colines on Wed 23 Sep 2015 - 15:49

First off, you need to know some basic ASM and learn at some level how SNES hardware works:
http://www.smwcentral.net/?p=viewthread&t=5977
http://ersan.io/?p=asm

After that, you are likely going to want some examples of MSU-1 code to see how you can play with it.

Conn made a great job by figuring out how the N-SPC music engine works at the CPU side(http://www.smwcentral.net/?p=viewthread&t=38116), so you may start with his source-codes to learn the MSU-1 basics: (look into the ASM files)

http://bszelda.zeldalegends.net/stuff/Con/f-zero_msu.zip
http://bszelda.zeldalegends.net/stuff/Con/smw_msu1.zip
https://github.com/qwertymodo/MSU1-Zelda

But the "logic" on these codes don't work for every game. Now it's getting tough, to hack a game to make it use MSU-1, you need to disassemble the part of the game which handles the music routine, or at least figure out how it works so you can "intercept" the song value (sent to one of these hardware registers: $2140 | $2141 | $2142 | $2143) and make it to be stored in a MSU-1 register:
https://web.archive.org/web/20140921005204/http://byuu.org/snes/msu1/specification/

Sometimes you can't rely entirely on the song value provided by the game because a lot of them use one thing called "music bank", for a quick understanding, this means that one value may play different songs in certain occasions.

After you are a little more experienced with ASM, you may like to take a look in DarkShock's work:
https://github.com/mlarouche?tab=repositories

He was able to figure out very complexes music engines and banks, this is indeed very advanced stuff. =)
avatar
Colines
Armos Knight
Armos Knight

Since : 2015-05-24

http://www.pausaprointervalo.com.br

Back to top Go down

Re: Any Tips for MSU1 Hacking?

Post by kurrono on Thu 28 Jan 2016 - 13:20

Hey Conn i see ur back..its like a month since the last time we talk here..can u give me a little to hacking mulitple tracks without using PHA and PLA to hack all songs on Rival Turf..i manage to play 2 tracks..only and they repeat on every stage..maybe i havent found right address to hack. i tried an INC A but the game plays msu-1 00e434 but the screen stays black...and. the address that work was. a sta $2140. 00e478
avatar
kurrono
Fluteboy
Fluteboy

Since : 2015-03-22

Back to top Go down

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum