Helios (the OS of the ATW) came with a port of GCC. It was, ironically, hard to use Occam on the ATW. I think you could also get Fortran, Modula2 and Ada comp

Helios (the OS of the ATW) came with a port of GCC. It was, ironically, hard to use Occam on the ATW. I think you could also get Fortran, Modula2 and Ada compilers for Helios.