| Cray Assembly | This version is specifically for being called from Fortran on a Cray system. There is a second version that is faster, but that has not been used as extensively as the first version. |
| IBM Assembly | This version is specifically for being called from Fortran on an IBM Mainframe. |
| Cray C | This version is specifically for being called from Fortran on a Cray system. |
| Microsoft C | This version is specifically for being called from Fortran on a PC with Microsoft C. You will also need the Fortran interface. |
| Sun/SGI C | This version is specifically for being called from Fortran on a Sun or SGI system. |