Before 1993, if you wanted to write Fortran code on a PC, your options were grim. You had compilers from Lahey, Salford, or Watcom. These were powerful but often lacked the visual integration that Microsoft was popularizing with Visual Basic.

Specialist sites like EMS Professional Software track part numbers and historical version information for collectors. Migration and Modern Alternatives

As a discontinued legacy product, Microsoft Fortran PowerStation 4.0 is no longer sold or supported by Microsoft. Microsoft Fortran PowerStation Professional Edition 4.0