List of Operating Systems - Proprietary - IBM - On IBM S/360, S/370, and Successor Mainframes

On IBM S/360, S/370, and Successor Mainframes

• OS/360 and successors on IBM S/360, S/370, and successor mainframes
  • OS/360 (first official OS targeted for the System/360 architecture),
    Saw customer installations of the following variations:
    • PCP (Primary Control Program, a kernel and a ground breaking automatic space allocating file system)
    • MFT (original Multi-programming with a Fixed number of Tasks, replaced by MFT II)
    • MFT II (Multi-Programming with a Fixed number of Tasks, had up to 15 fixed size application partitions, plus partitions for system tasks, initially defined at boot time but redefinable by operator command)
    • MVT (Multi-Programming Variable Tasks, had up to 15 application regions defined dynamically, plus additional regions for system tasks)
  • OS/VS (port of OS/360 targeted for the System/370 virtual memory architecture, "OS/370" is not correct name for OS/VS1 and OS/VS2, but rather refers to OS/VS2 MVS and MVS/SP Version 1),
    Customer installations in the following variations:
    • SVS (Single Virtual Storage, both VS1 & VS2 began as SVS systems)
    • OS/VS1 (Operating System/Virtual Storage 1, Virtual-memory version of MFT II)
    • OS/VS2 (Operating System/Virtual Storage 2, Virtual-memory version of OS/MVT but without multiprocessing support)
      • OS/VS2 R2 (called Multiple Virtual Storage, MVS, eliminated most need for VS1)
  • MVS/SE (MVS System Extensions)
  • MVS/SP (MVS System Product)
  • MVS/XA (MVS/SP V2. MVS supported eXtended Architecture, 31-bit addressing)
  • MVS/ESA (MVS supported Enterprise System Architecture, horizontal addressing extensions: data only address spaces called Dataspaces; a Unix environment was available starting with MVS/ESA V4R3)
  • OS/390 (Upgrade from MVS, with an additional Unix environment)
  • z/OS (OS/390 supported z/Architecture, 64-bit addressing)

• DOS/360 and successors on IBM S/360, S/370, and successor mainframes
  • BOS/360 (early interim version of DOS/360, briefly available at a few Alpha & Beta System/360 sites)
  • TOS/360 (similar to BOS above and more fleeting, able to boot and run from 2x00 series tape drives)
  • DOS/360 (Disk Operating System (DOS), multi-programming system with up to 3 partitions, first commonly available OS for System/360)
    • DOS/360/RJE (DOS/360 with a control program extension that provided for the monitoring of remote job entry hardware (card reader & printer) connected by dedicated phone lines)
  • DOS/VS (First DOS offered on System/370 systems, provided virtual storage)
  • DOS/VSE (also known as VSE, upgrade of DOS/VS, up to 14 fixed size processing partitions )
  • VSE/SP (program product replacing DOS/VSE and VSE/AF)
  • VSE/ESA (DOS/VSE extended virtual memory support to 32-bit addresses (Extended System Architecture)).
  • z/VSE (latest version of the four decades old DOS lineage, supports 64-bit addresses, multiprocessing, multiprogramming, SNA, TCP/IP, and some virtual machine features in support of Linux workloads)

CP/CMS (Control Program/Cambridge Monitor System) and successors on IBM S/360, S/370, and successor mainframes

• • CP-40/CMS (for System/360 Model 40)
  • CP-67/CMS (for System/360 Model 67)
  • VM/370 (Virtual Machine / Conversational Monitor System, virtual memory operating system for System/370)
  • VM/XA (VM/eXtended Architecture for System/370 with extended virtual memory)
  • VM/ESA (Virtual Machine / Extended System Architecture, added 31-bit addressing to VM series)
  • z/VM (z/Architecture version of the VM OS with 64-bit addressing)

• TPF Line (Transaction Processing Facility) on IBM S/360, S/370, and successor mainframes (largely used by airlines)
  • ACP (Airline Control Program)
  • TPF (Transaction Processing Facility)
  • z/TPF (z/Architecture extension)

• Unix-like on IBM S/360, S/370, and successor mainframes
  • AIX/370 (IBM's Advanced Interactive eXecutive, a System V Unix version)
  • AIX/ESA (IBM's Advanced Interactive eXecutive, a System V Unix version)
  • OpenSolaris for IBM System z
  • UTS (developed by Amdahl)
  • z/Linux

• Others on IBM S/360, S/370, and successor mainframes:
  • BOS/360 (Basic Operating System)
  • MTS (Michigan Terminal System for IBM System/360)
  • RTOS/360 (IBM's Real Time Operating System, ran on 5 NASA custom System/360-75s)
  • TOS/360 (Tape Operating System)
  • TSS/360 (IBM's Time Sharing System)
  • MUSIC/SP (developed by McGill University for IBM System/370)
  • ORVYL and WYLBUR (developed by Stanford University for IBM System/360)