is it possible to fix bugs that occure in certain roms??

Of course. You'll need knowledge and experience in programming and development in C++, a good understanding of emulation in general, knowledge of the psp and n64, and a couple of development tools.

Now if you mean minor graphical problems, like blend modes, it's perfectly possible.
Here was an old tutorial I made: viewtopic.php?f=50&t=1944

But now it's even easier with the blend mode maker. Try asking bdacanay about that because I never worked with it : P

thanks nintendoboy but there is no blend mode maker link and no tutorial on it

It might be built into the source. Try downloading the source here:
Direct link: http://daedalusx64.svn.sourceforge.net/ ... /?view=tar

If you need something to open it with download Winrar here:
http://www.win-rar.com/download.html

I should mention here that Kreationz (I've been told) is the only one really using it. Hopefully Kreationz will post here with correct/more info.

well i hope kreationz will post a tutorial

I added the blend explorer long time ago but never got around to do a tutorial for it.
First of all you need to compile Daedalus in debug mode.
Enter debug dlist in the pause menu and select the blend in combiner explorer and exit
Enter blend explorer and fiddle with combos until the problem is fixed.
Copy the new blend to Blender.cpp and compile.

a bit simplified but thats about what need to be done...

Go here if you need help with that step: http://forums.daedalusx64.com/viewtopic.php?t=964

For compiling in general you can go here: http://forums.daedalusx64.com/viewtopic.php?p=4166#p4166

The only bugs that can easily be fixed by any user are blendmodes, and only because our excellent devs made it to be so. Everything else is extremely difficult for the average forum member.