Things are different today I hope, but back in the 90's when I was teaching CS, Pascal was not very portable or standardized. Even some basic operations like op

Things are different today I hope, but back in the 90's when I was teaching CS, Pascal was not very portable or standardized. Even some basic operations like opening a file were not standardized. Turbo Pascal and AIX's Pascal (the two variants I dealt with back then) did this operation differently.