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Software  >   Networking  >   Communications Server  >     System requirements z/OS Communications Server, previous releases.   Operating System   Software   Hardware z/OS V1R4 Refer to z/OS V1R4.0 migration and installation z/OS V1R4.0 runs on: IBM eSeries zSeries 990 (z990), 900 (z900), and 800 (z800). IBM S/390 Parallel Enterprise Server - Generation 5 (G5) and Generation 6 (G6). IBM S/390 Multiprise 3000 Enterprise Server. z/OS.e V1R4.0 runs on: IBM eServer zSeries 800 (z800).