by Dinesh Thakur Category: Computer Terms

PCL, short for printer command language, consists of a large set of commands for controlling the Hewlett-Packard LaserJet and DeskJet families of printers, and compatible printers from other manufacturers. PCL commands are used to tell the printer where to place text or graphics on the page, which font to print, whether to print bold, italic or underlined text, and so on.



 
by Dinesh Thakur Category: Computer Terms

You have probably heard of printer ports and modem ports and perhaps ADB ports or some other kind of port. A port is a plug, or receptacle (known in other computer dictionaries as an input/output connector). Once you insert one end of a cable into a port, information can flow between your computer and whatever device is attached to the other end of the cable.



 
by Dinesh Thakur Category: Computer Terms

Boot Sector Virus: A computer VIRUS program that hides its code within the BOOT SECTOR of a FLOPPYDISK, so that the virus code is executed before the operating system itself has loaded, making countermeasures difficult to apply. Once loaded into memory, such a virus infects the boot sectors of any other floppy disk that is placed in the drive, hence ensuring its spread.



 
by Dinesh Thakur Category: Computer Terms

A serial port is the socket (also known as an "input/output connector") where you plug in the cables to attach to a serial device, such as a printer or modem.



 
by Dinesh Thakur Category: Computer Terms

A microprocessor is a single chip that is the central processing unit, or the brains of a computer. To function as a complete computer, it also needs memory, a clock) and a power supply. Well, a computer on a chip has its own built-in clock and its own memory, so all it needs is a power supply to function. These tiny things are used in all kinds of things, from car parts to children's toys.



 
by Dinesh Thakur Category: Computer Terms

Desktop publishing (DTP) is the process of creating printed documents that look professionally produced, using page layout software running on a personal computer, along with a high-quality, yet affordable, printer. To publish something with the traditional method, you would send typed or handwritten text to a typesetter, who would turn it into typeset text called "galleys," which took a couple of days. If there were corrections, it took another couple of days to get those back. If you didn't know how to layout the pages yourself, you'd take the galleys to a print shop, along with your art (illustrations and photographs).



 
by Dinesh Thakur Category: Computer Terms

Bleed refers to any element on a page that is printed beyond the edge of the paper. Whenever you see anything (text, graphics, photographs) that is printed right up to the edge of the paper, it was actually printed onto larger paper over the margin guidelines, and the paper was trimmed.

 
by Dinesh Thakur Category: Computer Terms

A device driver is a piece of software designed for a particular device (printer, mouse, monitor, or what have you) and the particular application program or environment you're working with. The driver serves as a go between for the program (or environment) and the device, translating the software's desires into commands the device understands.



 
by Dinesh Thakur Category: Computer Terms

A card, or printed circuit board, also known as a board, is a piece of plastic with chips attached to it. Chips are the tiny little circuits that run the computer. You buy a card and stick it inside the computer box. You can get accelerator cards (boards) that make your computer run faster, video cards that give your computer more graphic capability, and clock cards and printer cards or whole computers on a card. They range in price depending on what they do, who makes them, and so on. For instance, an accelerator card can cost $300-$1500.



 
by Dinesh Thakur Category: Computer Terms

"AirDrop" is a very handy feature and easy to use for wireless file transfer between Mac, even outside the context of a home network. AirDrop arrived on the iPad and iPhone with iOS 7 and on Mac with Mac OS X Lion. Indeed not need a router or even connect to an existing Wi-Fi or Bluetooth network to use "AirDrop". There is nothing to set up, all you need is a recent Mac ("AirDrop" indeed requires a recent Mac to be activated) and communication will be made directly between Wi-Fi cards Mac (ad-hoc mode).

 
by Dinesh Thakur Category: Computer Terms

A cluster is the smallest single unit of the space on a disk (a hard disk or a floppy or even an optical disc) that your computer's operating system keeps track of separately. The operating system keeps systematic records of which clusters are occupied by each file stored on the disk (in DOS, this is called the file allocation table, or FAT). Clusters usually consist of more than one sector, a sector being the smallest unit of disk space that the computer can read data from or write data on. There are too many sectors on a hard disk to keep track of them all individually, so the operating system deals with them in groups called clusters instead.



 
by Dinesh Thakur Category: Computer Terms

Boot Record: A set of crucial data written on the BOOTSECTOR of a HARDDISK or FLOPPYDISK that contains the information required by the INITIAL PROGRAM LOADER to locate a copy of the operating system on the disk and load it into memory. Damage to the boot record can prevent the computer from booting from that disk, and render the disk's other contents inaccessible; many disk repair utilities work by preserving and restoring backup copies of the boot record. Some types of VIRUS hide themselves within the boot record.



 
by Dinesh Thakur Category: Computer Terms

Information that is digital is information represented by numbers (digits) or more broadly, information that can be measured in discreet, exact values. The opposite term is analog, which describes information represented along a continuous range, where there are an infinite number of possible values. Trite as it may be, the best way to understand the difference between digital and analog is to compare a digital clock to a traditional round clock with hands.



 
by Dinesh Thakur Category: Computer Terms

A bug is a problem in software or hardware; to debug is to diagnose and correct said problem. Software programs inevitably develop bugs due to mistakes in planning or simply from accidentally typing the wrong command. Before a program can run properly, all bugs have to be found and corrected. A debugger is an application developed for the specific purpose of finding these problems; it lets the programmer run the program one step at a time so that she can see exactly where the mistake occurs.

 
by Dinesh Thakur Category: Computer Terms

A device just means any kind of component that's part of or attached to your computer. It can be located inside or outside the computer. A mouse, for example, is a device that sits outside the computer, while an internal disk drive (another device) is inside the computer. Devices need instructions on how to communicate with the printer or the rest of the computer, and sometimes those instructions aren't part of the computer's standard operating system.



 
by Dinesh Thakur Category: Computer Terms

Sometimes, like in a school computer lab or in an office, you need to hook up several computers to one printer, or several computers need to connect to one file server, or maybe you have several devices (such as a scanner and a CD-ROM player) that you need to hook into one computer. Well, the only way to connect all these devices together, since there is only one port, or connecting place, on the back of the computer, is to connect each object (each device) to the next one in line, making a daisy chain.



 
by Dinesh Thakur Category: Computer Terms

A disk has two sides (a top and a bottom). Each side of the disk has tracks (concentric rings) on the surface. Each ring is divided into arc-shaped sectors, little units of storage space on the disk, usually 512 bytes on a floppy disk and up to several thousand bytes on a hard disk. Whatever the size, a sector is the smallest unit the computer can read or write at a time; it cannot deal with portions of a sector.



 
by Dinesh Thakur Category: Computer Terms

clock cycle The basic unit of timing within a computer system, consisting of one of the stream of regular pulses generated by the SYSTEM CLOCK. Most of a computer's components, in particular its processor, bus and memory systems, operate in strict step with the clock, so the number of clock cycles their various actions occupy is of crucial importance to a computer designer.



 
by Dinesh Thakur Category: Computer Terms

A drive is the part of the computer that takes the disks or tapes you insert into the slot and spins them to make them work. You probably have at least two different kinds of drives in your system: floppy disk drives are the ones with the little slots where you insert floppy disks; the standard type of hard disk drive comes sealed inside a case, which in turn is stuck inside your computer or inside a separate box-you never even see the disk.



 
by Dinesh Thakur Category: Computer Terms

A laser disc (also known as a "video disc") is similar to a music CD, but it holds visual images as well as music. In fact, laser discs can store entire movies, concerts, operas, recordings of live theatre, and a wide variety of educational material. Its signal gets fed right into your television or video monitor, just like the video tape movies you rent. Laser discs are typically 12 inches wide, just like a standard long-playing phonograph record (remember those?).

 

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About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.