VS FORTRAN runs on MVS and z/VM. For MVS environments (MVS/ESA, OS/390, z/OS), the minimum software requirement is MVS/ESA Version 4 and MVS/ESA DFP Version 3 or higher. The current operating system is z/OS. For VM environments (VM/ESA, z/VM), the minimum software requirement is VM/ESA Version 1.0 or later. The current operating system is z/VM. For hardware, IBM VS Fortran runs on any hardware that supports the software. The current hardware is zSeries® server.