Q. Connection Machine FORTRAN?
Connection Machine Fortran was a subsequent SIMD language developed by Thinking Machines Corporation. Connection Machine Fortran incorporated all of FORTRAN 77 together with new array syntax of Fortran 90. It added different machine specific features however unlike CFD or DAP FORTRAN these appeared as compiler directives instead of special syntax in executable statements or Fortran declarations. A major development over previous languages was distributed array dimensions were no longer constrained to accurately fit in size of the processing element array. The compiler could transparently map dimensions of arbitrary extent across accessible processor grid dimensions. Ultimately the language added an explicitly parallel looping construct called FORALL. Though CM FORTRAN looked syntactically such as standard FORTRAN, the programmer had to be aware of numerous nuances such as the ILLIAC IV, the Connection Machine allowed Fortran arrays to either be distributed across processing nodes (known as CM arrays or distributed arrays) or allocated in memory of frontend computer (known as sequential arrays or front-end arrays). Nothing like the control unit of ILLIAC the Connection Machine frontend was general-purpose conventional computer--characteristically a Sun or VAX. However there were still important restrictions on how arrays could be manipulated, reflecting two possible homes.