I've uploaded the patch of the first game to the website. The other two will follow soon.
Hi! I have some test reports for you:
Dragon Ball Z - Super Butouden patch works on both JAP and PAL versions!
Dragon Ball Z - Super Butouden 2 patch works on JAP versions, both 1.0 and 1.1. The french PAL version already has SSJ Goku and SSJ Broly unlocked!
Dragon Ball Z - Super Butouden 3 patch works on JAP and KOR versions, doesn't work on PAL.
So, only part 3 would need a patch.
I already had the PAL info, but thanks for the info on the other Asian versions! I've already made a patch for the PAL version of SB 3, which I'll add to the entry on the website.
Interesting patches, but I may have an easier alternative:
After inputting the cheat codes to unlock the hidden characters, make a save state at the title screen via emulator. This way, you can just load the game instead of having to enter these codes again each time. This is just a suggestion.
Personally, I don't like to use save states. I'd much rather use a patch to apply it or add saving functionality. Regardless, you still need to look up and enter the cheat and if you play on multiple systems/emulators you'll have to make a new save state or make sure to copy the save state each time. A hacked rom is ultimately more convenient.