Hi! I'm having kind of a "little" problem. I got an old program written in Fortran77 and I want to implement some functionality from Fortran90 routines. The routines are quite long, so I'm not able to rewrite them in F77... Is there a possibility to connect the routines so that they can communicate (exchange variable values) in a fast way. I have though about the COMMON Blocks of F77 and the MODULE Statements in F90. Is there a way of connecting these data structures in a way, that a F90 program can read a F77 COMMON Block. (I though about a I/O-interface but I think this is too slow) Thanks for your help!