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NOS110 ch1
Terms and definitions from chapter 1
40
Other
Undergraduate 2
08/24/2012

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Term
Application Programming Interface (API)
Definition
Functions or programming features in an operating system that programmers can use for network links, links to messaging services,
or interfaces to other systems.
Term
Application software
Definition
A word processor, spreadsheet, database, computer game, or other
type of application that a user runs on a computer. It consists of
computer code that is formatted so that the computer or its operating system can translate that code into a specific task,
Term
Basic input/output system (BIOS)
Definition
Low-level program code that conducts basic hardware and software communications inside the computer. It resides between the computer hardware and higher level operating system.
Term
Batch processing
Definition
A computing style frequently employed by large systems. A request for a
series of processes is submitted to the computer; information is displayed or printed when the process is complete.
Term
Beginner's All-purpose Symbolic Instruction Code (BASIC)
Definition
An English-like computer
programming language originally designed as a teaching tool, but which evolved into a
useful and relatively powerful development language.
Term
Blade enclosure
Definition
A large box with slots for blade servers and the box provides cooling
fans, electrical power, connection to a shared monitor and pointing device, and even network connectivity.
Term
Blade server
Definition
A server unit that looks like a card that fits into a blade enclosure. They are intended to save space.
Term
Client/server systems
Definition
A computer hardware and software design in which different portions of an application execute on different computers, or on different components of a single computer.
Term
Cloud computing
Definition
A computing technology that provides a host of scalable Web-based
applications and services over the Internet or a private network that are used by clients through Web browsers.
Term
code
Definition
Instructions written in a computer programming language.
Term
command-line interface
Definition
An interface from which a user can enter commands.
Term
Complementary Metal Oxide Semiconductor (CMOS) memory
Definition
A type of NVRAM that uses a low-power technology and when employed to store the BIOS in a computer, it is powered by a small battery.
Term
Cooperative multitasking
Definition
A computer hardware and software design in which the operating system temporarily hands off control to an application and waits for the application to return control to the operating system.
Term
Desktop operating system
Definition
A computer operating system that typically is installed on a PC type of computer, usually used by one person at a time, that may or may not be connected to a network.
Term
Device driver
Definition
Computer software designed to provide the operating system and application
software access to specific computer hardware.
Term
Graphical User Interface (GUI)
Definition
An interface between the user and an operating system, which presents information in an intuitive graphical format that employs multiple colors, figures, icons, windows, toolbars, and other features. Usually deployed with a pointing device to make users more efficient.
Term
Hardware
Definition
The physical devices in a computer that you can touch (if you have the cover off), such as the CPU, circuit boards (cards), disk drives, monitor, and modem.
Term
Input/Output (I/O)
Definition
The first is information taken in by a computer device to handle or process, such as characters typed at a keyboard. The second is information sent out by a computer device after that information is handled or processed, such as displaying the characters typed at the keyboard on the monitor.
Term
Kernel
Definition
An essential set of programs and computer code built into a computer operating system to control processor, disk, memory, and other functions central to the basic operation of a computer. The kernel communicates with the BIOS, device drivers, and the API to perform these functions. It also interfaces with the resource managers.
Term
Microsoft Disk Operating System (MS-DOS)
Definition
The first widely distributed operating system for microcomputers, created by Tim Patterson and a team, including Bill Gates, at Microsoft. This is generic computer code used to control many basic computer hardware and software functions.
Term
Multitasking
Definition
A technique that allows a computer to run two or more programs at the same time.
Term
Distribution
Definition
An issuance of UNIX or Linux that is based on a standard kernel, but that
also has customizations added by a particular private or commercial development group.
Term
Multithreading
Definition
Running several program processes or parts (threads) at the same time.
Term
Multiuser system
Definition
A computer hardware and software system designed to service multiple users who access the computer’s hardware and software applications simultaneously.
Term
Nonvolatile Random Access Memory (NVRAM)
Definition
Computer memory that does not lose its contents when the power is turned off. One way to ensure non-volatile memory is by connecting the memory to a battery.
Term
Operating System (OS)
Definition
Computer software code that interfaces with user application software and the computer’s BIOS to allow the applications to interact with the computer hardware.
Term
Power-On Self Test (POST)
Definition
Tests, such as memory and hardware component tests, that are run by the BIOS when a computer first starts and that must complete before the operating system is loaded.
Term
Preemptive multitasking
Definition
A computer hardware and software design for multitasking of applications in which the operating system retains control of the computer at all times.
Term
Rack-mounted server
Definition
CPU boxes mounted in racks that can hold multiple servers, each with its own power cord and network connection—and that often share one monitor and pointing device.
Term
Read-Only Memory (ROM)
Definition
Memory that contains information that is not erased when the power is removed from the memory hardware.
Term
Real-time system
Definition
An operating system that interacts directly with the user and responds in real time with required information.
Term
Resource managers
Definition
Programs that manage computer memory and CPU use.
Term
Sequential processing
Definition
A computer processing style in which each operation is submitted, acted upon, and the results displayed before the next process is started. Compare to batch processing.
Term
Server operating system
Definition
A computer operating system usually found on more powerful PC-based computers than those used for desktop operating systems, which is connected to a network, and that can act in many roles to enable multiple users to access information.
Term
Shell
Definition
An interface to enable humans to interact with an operating system kernel. It enables the user to execute commands.
Term
Single-tasking
Definition
A computer hardware and software design that can manage only a single task at a time.
Term
Single-user system
Definition
A computer hardware and software system that enables only one user to access its resources at a particular time.
Term
Supercomputer
Definition
A computer that has extreme processing power and speed to handle complex computations that are beyond the reach of other computers.
Term
Task switching
Definition
A hybrid between single-tasking and multitasking that permits the user or application software to switch among multiple single-tasking operations.
Term
Time-sharing system
Definition
A central computer system, such as a mainframe, that is used by multiple users and applications simultaneously.
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