...Also what changes have any of you made to the psx version if any? lol.
"lol." huh? That's quite elegant speech you got there...
This should go into the Game Tweaking FAQ. If anyone wants to copy it, feel free. My mod powers are weak here.
There are a lot of tools for the PC version of Final Fantasy 7! How can I use them to modify my Final Fantasy 7 PSX ISO?The short answer is you can't mod the PSX version of FF7.
Here's the long answer.
As the custom PSP-OE 3.x firmware becomes more popular, the ISO files for FF7 has become more in demand. Barring the fact that we don't support copied versions of the game, I'm going to humor you and pretend that the ISO you have is actually yours.
For me to better explain myself, I have to give you a little lesson on how filesystems work.
When you want to read data on a normal CD-ROM filesystem, it goes like this. First you tell the computer what file you want. The computer then goes to the directory, finds the filename, and then looks up where on the disk the actual data is located. The computer then moves the read head to that location on the disk, and copies the data from the disk into memory.
This is well and good for normal filesystems, but this is not how FF7 accesses it's data. During development of FF7, it became painfully obvious that loading data the old fashioned way was going to be a royal pain. First, the above method was way too slow. Second, by loading the data in the traditional way, they would actually lock the PSX until the data was loaded. To get around this Square decided to skip the whole directory reading part and hard-code the location of the data directly into the executable. This means that during the final stages of the FF7 build process, they would compress all their data, write it to an image file much like your ISO, and then after everything was locked, write the locations directly into the game executable on the ISO. Realistically, you only need about 5% of the directly to play the game. Enough to load the executable. That's it. In FF8, they actually got rid of the directory, filenames and all, and wrote everything to a large binary file.
The upshot is unless you plan on unpacking and uncompressing the entire disk, changing your data, and then rebuilding your own ISO after the edit, making sure that the executable and other data helper files points to all the correct sectors on the disk, there really isn't a lot you can do.
It's called "Compact Disk Read Only Memory" for a reason.
