Cannabaceae

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Control Program Facility (CPF)
DeveloperIBM
Written inPL/MI[1]
Working stateDiscontinued
Source modelClosed Source
Initial release1978; 46 years ago (1978)
Latest releaseRelease 8 / 14 November 1986; 37 years ago (1986-11-14)[2]
PlatformsIBM System/38
Default
user interface		Command-line interface
LicenseProprietary
Succeeded byOS/400

Control Program Facility (CPF) is the operating system of the IBM System/38.[3] CPF represented an independendent line of development at IBM Rochester, and was unrelated to the earlier and more widely used System Support Program operating system. CPF evolved into the OS/400 operating system, which was originally known as XPF (Extended CPF).[1]

While CPF is considered to be the operating system of the System/38, much of the hardware and resource management of the platform is implemented in the System/38's Horizontal and Vertical Microcode.[1][4]

Description of the libraries[edit]

  • QGPL – general purpose library
  • QSYS – system library
  • QSPL – spooling library
  • QTEMP – temporary library
  • QSRV – system service library
  • QRECOVERY – system recovery library

Data storage[edit]

In most computers prior to the System/38, and most modern ones, data stored on disk was stored in separate logical files. When data was added to a file it was written in the sector dedicated to this, or if the sector was full, on a new sector somewhere else.

The System/38 adopted the single-level store architecture, where main storage and disk storage are organized as one, from the abandoned IBM Future Systems project (FS).[5] Every piece of data was stored separately and could be put anywhere on the system. There was no such thing as a physically contiguous file on disk, and the operating system managed the storage and recall of all data elements.

Capability-based addressing[edit]

CPF was an example of a commercially-available Capability-based operating system. System/38 was one of the few commercial computers with capability-based addressing.[6] Capability-based addressing was removed in the follow-on OS/400 operating system.[7]

Distributed Data Management[edit]

In 1986, System/38 announced support for Distributed Data Management Architecture (DDM). Such a middleware in the context of a distributed system is the software layer that lies between the operating system and applications. Distributed Data Management Architecture defines an environment for sharing data. This enables System/38 programs to create, manage, and access record-oriented files on remote System/36, System/38, and IBM mainframe systems running CICS. It also allows programs on remote System/36 and System/38 computers to create, manage, and access files of a System/38.

Programming languages[edit]

Languages supported on the System/38 included RPG III, COBOL, BASIC, and PL/I. CPF also implements the Control Language for System/38.[8]

References[edit]

  1. ^ a b c Frank G. Soltis (1997). Inside the AS/400, Second Edition. Duke Press. ISBN 978-1882419661.
  2. ^ "IBM SYSTEM/38 CONTROL PROGRAM FACILITY RELEASE 8 AVAILABLE WITH ENHANCEMENTS". IBM. 1986-10-07. Retrieved 2021-04-07.
  3. ^ IBM System/38 Technical Developments (PDF). IBM Product Design and Development, General Systems Division. 1980 [1978]. ISBN 0-933186-03-7. G580-0237-1.
  4. ^ Soltis, Frank (September 1981). "Design of a Small Business Data Processing System". IEEE Computer. 14: 77–93. doi:10.1109/C-M.1981.220610. S2CID 398484.
  5. ^ Mark Smotherman. "IBM Future System (FS) - 1970s". Retrieved October 11, 2017.
  6. ^ Levy, Henry M. (1984). "The IBM System/38" (PDF). Capability-Based Computer Systems. Digital Press. ISBN 0-932376-22-3.
  7. ^ Soltis, Frank G. (July 2001). Fortress Rochester: The Inside Story of the IBM ISeries. 29th Street Press. p. 119. ISBN 978-1-58304-083-6..
  8. ^ "IBM System/38 Control Language Reference Manual" (PDF). IBM. 1982-09-10. Retrieved 2021-03-24.[permanent dead link]

External links[edit]

source: https://en.wikipedia.org/wiki/Control_Program_Facility

One thought on “Cannabaceae”

  1. Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
    View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction

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