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The IBM AS/400 (Application System/400) is a family of midrange computers from IBM announced in June 1988 and released in August 1988. It was the successor to the System/36 and System/38 platforms, and ran the OS/400 operating system.
It was originally released in 1988 as OS/400, as the sole operating system of the IBM AS/400 line of systems. It was renamed to i5/OS in 2004, before being renamed a second time to IBM i in 2008. [8] [9] It is an evolution of the System/38 CPF operating system, [5] with compatibility layers for System/36 SSP and AIX applications. [5]
The RPG programming language originally was created by IBM for their 1401 systems. IBM later produced implementations for the 7070/72/74 [4] [5] and System/360; [6] RPG II became the primary programming language for their midrange computer product line, (the System/3, System/32, System/34, System/38, System/36 and AS/400).
IBM's version of SQL is also utilized on the OS integrated database system called Db2 for i. Recent development efforts have added object oriented components written in the Java programming language, which extends a portion of the XA product to servers running Java. However, the Infor XA product still requires the IBM i operating system.
The application program interfaces of IBM's mainframe operating systems is defined as a set of assembly language "macro" instructions, that typically invoke Supervisor Call (SVC) [e.g., on z/OS] or Diagnose (DIAG) [on, e.g., z/VM] instructions to invoke operating system routines. It is possible to use operating system services from programs ...
In April 2008, IBM officially merged the two lines of servers and workstations under the same name, Power, [2] and later Power Systems, with identical hardware and a choice of operating systems, software, and service contracts, [3] based formerly on a POWER6 architecture. The PowerPC line was discontinued.
In the System window, you will find information about your computer, including the operating system version. The information displayed will include the Windows edition, system type (32-bit or 64 ...
System/360's operating systems were more complex than previous IBM operating systems for several reasons, including: [28] They had to support multiprogramming – switching to run another in-progress application when the current application was blocked waiting for I/O operations (such as disk reads) to complete.