thanks for your info... I'm closer to have it compile now :P Apparently jbsr is not recognized by a68k, what's the difference between jbsr and jsr?. Last question: for what I've saw, the way to write hexadecimal numbers is with a $ in front of them, so I thought that converting 0xC8.w into $c8.w should work... but it's not. again, thanks a lot for your help, ra.-