Fortran

[James R. Hutchinson]

I am a long time FORTRAN user who no longer has access to the 
computers on which I was running it.  I recently bought an imac Intel 
computer using OS X 10.4.7 and would like to be able to run FORTRAN 
on it.  I want something strictly for computation not for program 
development.  I learned to write FORTRAN in FORTRAN II so do not care 
how old the version is.  Can you tell me what minimum in programs I 
need to get started?  I have downloaded the Developer tools from 
Apple including xcode v. 2.3 but haven't the slightest idea what to 
do with it.

Help!

Jim