2. If this is your masters topic work then you need to fix all of the errors -- there are 20000 lines of code so someone with say 40 years of experience it will take a long weekend of nothing else -- you might just get it running - this includes getting rid of all of the commons, implicit variables and finding all of the missed named variables. The code was written in 1982 - there is a lot of potential errors that a modern compiler will pick up that the old compilers allowed. If you are doing it then set aside a month of time to learn and do it. At the end you will be a good programmer and intimately familiar with these people here. The six errors shown are just the tip of the iceberg, there are a lot there. Reading the code made me smile.