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The types of range from the Hybrid to the Analog types. The computers you come across in the daily course of your day range from , palmtops and towers, to desktop computers, to name a few. But the very word “computers” reminds one of the desktop computers used in offices or homes. Different categories of computes have been devised in keeping with our varied needs. The Types Of Computers: Analog and Hybrid (classification based on operational principle)

• Analog Computers: The analog is almost an extinct type of computer these days. It is different from a digital computer in respect that it can perform numerous mathematical operations simultaneously. It is also unique in terms of operation as it utilizes continuous variables for the purpose of mathematical computation. It utilizes mechanical, hydraulic, or electrical energy or operation. • Hybrid computers: These types of computers are, as the name suggests, a combination of both Analog and Digital computers. The Digital computers which work on the principle of binary digit system of “0” and “1” can give very precise results. But the problem is that they are too slow and incapable of large scale mathematical operation. In the hybrid types of computers the Digital counterparts convert the analog signals to perform Robotics and Process control.

Apart from this, computers are also categorized on the basis of physical structures and the purpose of their use. Based on Capacity, speed and reliability they can be divided into three categories of computers:

1. The Mainframe Computer – These are computers used by large organizations like meteorological surveys and statistical institutes for performing bulk mathematical computations. They are core computers which are used for desktop functions of over one hundred people simultaneously.

2. The – These are the most frequently used computers better known by the name of “Personal computers”. This is the type of computer meant for public use. Other than the choice ranges as follows:

• Personal Digital Computer • Tablet PC • Towers • Work Stations • Laptops • Hand Held Computer

3. The Mini computer – Mini computers like the mainframe computers are used by business organization. The difference being that it can support the simultaneous working of up to 100 users and is usually maintained in business organizations for the maintenance of accounts and finances.

Yet another category of computer is the Super Computers. It is somewhat similar to mainframe computers and is used in economic forecasts and engineering designs. Today life without computers is inconceivable. Usage of different types of computers has made life both smooth and fast paced.

Laptop:

Laptops or Notebook computers are a type of personal computers which are portable devices. The special feature of computers is that it is far lighter than a Desktop PC. Being a wireless system, you can use it even when there is a power cut or you are away from home where electricity is not available.

Laptops or Notebook Computers are different from a desktop computer not only in terms of size and portability but the following factors count for the basic difference:

• In laptops, the mouse, keyboard and sound box is integrated with the main system itself. • A notebook computer is not powered by electricity but by a battery. • Nowadays networking features like Intel Centrino mobile Technology is installed within the laptop computers itself. • In most laptops with the exception of a few like Alienware, the internal parts cannot be updated once you have bought the Laptop. • And to say the least it is far more fragile than a Desktop PC. While buying a Laptop computer you need to consider the quality of the . What accounts for the portability, are the following factors. So make sure to check out that the basic components of the system, that is to say, the , Memory, Mass Storage and Removal components and the accessories should be designed in such a way that it is

• as and small as possible; • should be powered by a proper battery which must generate minimum heat; • should be accessible by a floppy or a CD.

With the market pouring over with companies such as Compaq, Acer, Toshiba, Zenith, Sahara, HCL, Lenovo, Del Inspiration, , HP computers, Apple Computers, Alienware and many more, you can choose laptops ranging in price anywhere between 29000 ICR to anywhere beyond 1,00,000.

Personal:

Personal computers or are the most widely used computers which have found application in everyday activity of the modern world. The speed and accuracy of processing of the personal systems account for their high popularity.

think of a world where share market trading had to be carried out manually and the times when the fastest means of communication was but for the telephones were the telegrams. Those days are not even past 50 years, yet you cannot imagine life without the aid of personal computers or “PCs” as you abbreviate them.

Personal computers remind us mostly of Desktop computers or at the most Laptop computers. But actually Personal computers refer to:-

• Desktop computers – Desktop Computers are those Personal computers that one comes across in business institutions, ATM s, Offices, etc. They have the second largest market among all kinds of PCs. They are unportable and long lasting. • Laptop computers – Laptop Computers are a personal system sub-type. As the name goes, it is a portable computer which is usually a light weight PC. The special feature of course, is that it is far lighter than a Desktop PC and being a wireless system, you can use it even when there is a power cut or you are away from home where electricity is not available

• Hand held computers or palm tops – Palm tops like laptops are portable personal computers which are even smaller and lighter and can be carried in a pocket. Ideally a palmtop is used for storage of personal information like phone numbers, appointments and the likes. Nowadays with the improvement of technology palmtops come with colored monitors, sound recording facilities, and even provision for access to the Internet. • Tablet Personal Computers – Tablet PCs are also a kind of micro computers. They are mostly used in Graphics work is an electronic device that utilizes digital ink to write or draw directly on the monitor of you PC.

• Work Stations – This is slightly different from the regular PC in respect that it has evolved from the mini computers. Originally used for Engineering, Graphics and such other non-personal work or technical work, work station computers were designed for the purpose of singular interaction of computer with one person at a time.

The personal computers or Micro computers are manufactured by several multinational companies such as the HP computers, HCL, Del Inspiration, Acer, Toshiba and many more.

INPUT DEVICES:

A is a consisting of a ball held by a socket containing sensors to detect a rotation of the ball about two axes—like an upside- down mouse with an exposed protruding ball. The user rolls the ball with the thumb, fingers, or the palm of the hand to move a . Large tracker balls are common on CAD workstations for easy precision. Before the advent of the , small were common on portable computers, where there may be no desk space on which to run a mouse. Some small thumbballs clip onto the side of the keyboard and have integral buttons with the same function as mouse buttons. The trackball was invented by Tom Cranston and Fred Longstaff as part of the Royal Canadian Navy's DATAR system in 1952, [1] eleven years before the mouse was invented. This first trackball used a Canadian five-pin bowling ball.

The world's first trackball invented by Tom Cranston, Fred Longstaff andKenyon Taylor working on the Royal Canadian Navy's DATAR project in 1952. It used a standard Canadian five-pin bowling ball.

When mice still used a mechanical design (with slotted 'chopper' wheels interrupting a beam of light to measure rotation), trackballs had the advantage of being in contact with the user's hand, which is generally cleaner than the desk or mousepad and does not drag lint into the chopper wheels. The late 1990s replacement of mouseballs by direct optical tracking put trackballs at a disadvantage and forced them to retreat into niches where their distinctive merits remained more important. Most trackballs now have direct optical tracking which follows dots on the ball. As with modern mice, most trackballs now have an auxiliary device primarily intended for . Some have a scroll wheel like most mice, but the most common type is a “scroll ring” which is spun around the ball. Kensington's SlimBlade Trackball similarly tracks the ball itself in three dimensions for scrolling. Three major companies Logitech, A4Tech, and Kensington currently produce trackball, although A4Tech has not released a new model in several years. Microsoft was a major producer, but has since discontinued all of its products. The Microsoft Trackball Explorer continues to be extremely popular (it has no analogous design in production by another company), with used models selling for ~$200 on ebay.

A trackball is a computer cursor control device used in many notebook and laptop computers. The trackball is usually located in front of the keyboardtoward the user. Essentially, the trackball is an upside-down mouse that rotates in place within a socket. The user rolls the ball to direct the cursor to the desired place on the screen and can click one of two buttons (identical to mouse buttons) near the trackball to select desktop objects or position the cursor for text entry.

IBM's ThinkPad series of notebook computers uses a "", called a TrackPoint, that is integrated into the middle of the keyboard keys.

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Optical trackball mouse Products Suppliers

Below are the listings of Optical trackball mouse products and suppliers. You can browse related product categories, and further refine your search by product keywords. You can also view profiles of other suppliers offering Optical trackball mouse.

Supplier Products Description Information Illuminated optical trackball model so50a Main features of illuminated Optical Trackball Model SO50A: • Adopts inductive sensor and stable fully compatible Mcu, the resolution of device is adjustable from 200dpi to 1000 dpi. This allows it a more precise tracking of movements; unique design of waterproof and dust proof makes it easy to get IP67 protect level. Special mechanical st... Also Deals in : Illuminated trackball sensor sm36b | Mechanical trackball sm50a | Industrial trackball sm3

Scanners:

A scanner is a device that captures images from photographic prints, posters, magazine pages, and similar sources for computer editing and display. Scanners come in hand-held, feed-in, and flatbed types and for scanning black- and-white only, or color. Very high resolution scanners are used for scanning for high-resolution printing, but lower resolution scanners are adequate for capturing images for computer display. Scanners usually come with software, such as Adobe's Photoshop product, that lets you resize and otherwise modify a captured image.

Scanners usually attach to your with a Small Computer System Interface ( SCSI ). An application such as PhotoShop uses the TWAINprogram to read in the image.

Some major manufacturers of scanners include: Epson, Hewlett-Packard, Microtek, and Relisys.

Nowadays, computer scanners are already one of the many devices that almost every family wants to have next to their computers or printers. It is very convenient to own one especially if you needed to scan quite a lot of and images to reproduce and send over the Internet. Scanners are also an important piece of gadget in business offices. Scanners are really powerful gadgets that work like the old paper copiers (only better) but with the ability to be saved in digital format.

There are various types of scanners that are now sold worldwide. They range from different manufacturers and brands. Each brand have different models and features; so it is always wise to take a look at different types before deciding on a particular type to purchase. Probably one of the earliest scanners that have been released in the market then that are still available now are flatbed scanners.

If you have a business that involves the processing of data and you want speedier scanning results, then you might want to consider investing on scanners that can with the ADF or automatic feeder feature. Although some flatbed scanners already have more or less a fifty page ADF feature, you might want to look at other options especially if you are also particular about how much space a flatbed scanner can occupy. One particular drawback (if you may call it a drawback) is on the amount of space it can occupy on your workspace. It may not be ideal for users who have such space limitations. This is where they might need to consider investing on portable types. Sheet-fed scanners wouldn’t take too much space than flatbeds. With a hundred page automatic document feeder for a sheet-fed type of scanner, this is already a good thing.

Keyboard: In computing, akeyboard is atypewriter-style keyboard, which uses an arrangement of buttons or keys, to act as mechanical levers or electronic switches. Following the decline ofpunch cards and paper tape, interaction viateletype-style keyboards became the main for computers. Despite the development of alternative input devices, such as the mouse, , pen devices, character recognition and voice recognition, the keyboard remains the most commonly used and most versatile device used for direct (human) input into computers. A keyboard typically has characters engraved or printed on the keys and each press of a key typically corresponds to a single written symbol. However, to produce some symbols requires pressing and holding several keys simultaneously or in sequence. While most keyboard keys produce letters, numbers or signs (characters), other keys or simultaneous key presses can produce actions or computer commands. In normal usage, the keyboard is used to type text and numbers into a word processor, text editor or other program. In a modern computer, the interpretation of key presses is generally left to the software. A computer keyboard distinguishes each physical key from every other and reports all key presses to the controlling software. Keyboards are also used for computer gaming, either with regular keyboards or by using keyboards with special gaming features, which can expedite frequently used keystroke combinations. A keyboard is also used to give commands to the of a computer, such as Windows' Control-Alt-Delete combination, which brings up a task window or shuts down the machine. It is the only way to enter commands on a command-line interface. The set of typewriter-like keys that enables you to enter data into a computer. Computer keyboards are similar to electric-typewriter keyboards but contain additional keys. The keys on computer keyboards are often classified as follows:  alphanumeric keys -- letters and numbers  punctuation keys -- comma, period, semicolon, and so on.  special keys -- function keys, control keys, arrow keys, Caps Lock key, and so on. The standard layout of letters, numbers, and punctuation is known as aQWERTY keyboard because the first six keys on the top row of letters spellQWERTY. The QWERTY keyboard was designed in the 1800s for mechanical typewriters and was actually designed to slow typists down to avoid jamming the keys. Another keyboard design, which has letters positioned for speed typing, is the Dvorak keyboard. There is no standard computer keyboard, although many manufacturers imitate the keyboards of PCs. There are actually three different PC keyboards: the original PC keyboard, with 84 keys; the AT keyboard, also with 84 keys; and the enhanced keyboard, with 101 keys. The three differ somewhat in the placement of function keys, the Control key, the Return key, and the Shift keys. In addition to these keys, IBM keyboards contain the following keys: Page Up,Page Down, Home, End, Insert, Pause, Num Lock, Scroll Lock, Break, Caps Lock, Print Screen. There are several different types of keyboards for the Apple Macintosh. All of them are called ADB keyboards because they connect to the Apple Desktop bus (ADB). The two main varieties of Macintosh keyboards are the standardkeyboard and the extended keyboard, which has 15 additional special-function keys.

Monitors:

A monitor or display (sometimes called a visual display unit) is anelectronic visual display forcomputers. The monitor comprises the , circuitry, and an enclosure. The display device in modern monitors is typically athin transistor liquid crystal display (TFT-LCD) thin panel, while older monitors use a cathode ray tube about as deep as the screen size. The first computer monitors usedCathode ray tubes (CRTs), which was the dominant technology until they were replaced by LCD monitors in the 21st Century. Originally, computer monitors were used for data processing while receivers were used for entertainment. From the 80s onwards, computers have been used for both data processing and entertainment, while have implemented some computer functionality. The common of televisions, and then computer monitors, has also changed from 4:3 to 16:9. Depending on your budget, there are a lot of options out there when it comes to computer monitors. With so many choices to consider, it is important to determine your needs before making your purchase. Important considerations are space available, size needed, and budget. CRT

o CRT (Cathode Ray Tube) computer monitors were the most common computer monitors until flat panel screens became affordable. Similar to older TVs, CRT monitors still typically have much better contrast ratios and viewing angles than other alternatives. LCD

o LCD (Liquid Crystal Display) computer monitors save a lot of space and can even be mounted on walls. They provide a wide viewing angle and come in sizes typically ranging from 17-inches to 60-inches. Plasma

o Plasma computer monitors are less commonly used with computers due to their high operating temperatures, high power consumption, and fixed resolution. Touchscreen

o Touchscreen computer monitors provide a new way of interacting with your computer with a touch-sensitive screen. This allows users to interact directly with the application on screen without need for a mouse or keyboard. OLED

o OLED (Organic Light Emitting Display) computer monitors are much thinner and brighter than LCD or Plasma screens. OLED monitors can also be placed on transparent surfaces, such as glass, allowing the user to see through them when not active.

Four Types of Monitors By Michael Signal, eHow Contributor updated March 11, 2011 •

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• Print this article In the early years of the personal computer, monitors were big and bulky. Today there are different types of computer monitors, and many are sleek, thin, flat displays that can display images with vivid colors and high-definition . But the big cathode-ray-tube display of the past has not yet been completely phased out of use. CRT

o Cathode ray tube (CRT) monitors represent an early generation of computer display technology. CRT technology started with televisions and then became the only option in computer monitors for years. A cathode-ray gun sits at the back of a CRT monitor and shoots electrons toward the front of the monitor. The beams of electrons, or cathode rays, separate into colors and shapes at the front of the screen. CRT monitor technology and components dictate that the monitors must be fairly large. As screen sizes became larger, CRT monitors became heavy and unwieldy. CRT monitors have largely been replaced by LCD displays, but they can still be found on some older computers. LCD

o Liquid crystal display (LCD) monitors also create images by sending electrons toward the screen. The electrons apply current to a layer of liquid crystals that distort in different ways in reaction to a at the rear of the display. The light passes through the liquid crystals and two filters. The interaction between the light, filters and liquid crystal matrix result in the screen image. LCD displays are ideal for larger screen images because the components are sandwiched together like sheets, making the display very thin. This also makes the entire monitor much lighter than a CRT monitor. Touch Screen

o Touch screens have become popular on smart phones, MP3 players and other mobile devices. But they've also been popular computer displays for years in retail and restaurant applications. Touch screens for commercial use often feature a specialized operating system, but more general touch-screen monitors are being developed to work with home computers' operating systems and software. Touch-screen monitor images don't come from a specialized source; they are LCD monitors, but they also act as input devices. Many "pad" computers use touch screens exclusively for input, having neither a mouse nor keyboard attached. 3D

o A resurgence in 3D in theaters has led to 3D televisions and monitors. The monitors are intended for gamers and users who use their computers as movie players. Users must wear special 3D glasses to view 3D images on any monitor. Some 3D solutions consist of a 3D monitor and passive 3D glasses that don't have any special mechanisms, just special lenses. The other option is to make any 120Hz monitor display images in 3D by using active 3D glasses. These glasses use shutters that block each lens in succession, so viewers only see an image through one eye at a time. Tech website, Tom's Guide, states in a review that both types of 3D systems have their advantages, but gaming in 3D uses so much graphics-processing power that many games play more slowly than usual.

s generate output with the help of cathode ray tubes. This type of device is called the CRT (or, cathode ray tube) monitor. Some computer users prefer this style because it offers a richly colored display and does not break easily. However, CRT monitors can be bulky and take up a lot of desk space, very heavy to carry, and they require a lot of power to run properly. Moreover, the picture screen can distort, display a " effect," or burn out over time.

A computer monitor, technically termed as a visual display unit, can be plainly described as an electronic device that transmits information from the computer onto a screen, thereby acting as an interface and connecting the viewer with the computer. At present, computer monitors are available in a variety of shapes, designs and colors. However, based on the technology used in the making of computer monitors, they can be broadly categorized into two types. These include CRT (cathode ray tube) and LCD (Liquid Crystal Technology). CRT (Cathode Ray Tube) Monitors:These monitors employ the CRT technology used most commonly in the manufacturing of television screens. In this, a stream of intense high energy electrons is used to form images on a fluorescent screen. A cathode ray tube is a basically a containing an electron gun at one end and a fluorescent screen at another end. From this electron gun, a strong beam of electrons is generated by a process called thermionic emission. These electrons are made to travel through a narrow path within the tube with high speed using various electro-magnetic devices and finally strike the phosphor points present on the fluorescent screen, thus creating an image. There are several advantages of using CRT monitors. • These monitors are highly reliable, efficient and are capable of generating a resolution up to 2048 x 1536 , thereby providing a clear picture quality. Also, CRT monitors that are now available are capable of producing thousands of different colors. • Secondly, CRT monitors are affordable and cost effective. • Unlike conventional CRT monitors, modern technological advancements have resulted in the development of flat screen CRT monitors that reduce the glare and are good for your eyes. However, the only concern with buying CRT monitors is that they are heavy and can occupy a great deal of work space. Also, these devices get heated up very easily. LCD (Liquid Crystal Display) Monitors: Liquid crystal display, also known as liquid crystal diode, is one of the most advanced technologies available at present. Typically, an LCD monitor consists of a layer of color or pixels arranged schematically between a couple of transparent electrodes and two polarizing filters. Optical effect is achieved by polarizing the light in varied amounts and making it pass through the liquid crystal layer. At present, there are two different types of LCD technology available. These include the active matrix or TFT, and a passive matrix technology. Among these, TFT technology is much secure, reliable and generates better picture quality. On the other hand, passive matrix has a slow response time and is slowly becoming outdated. In the recent times, LCD monitors are becoming increasing popular with consumers. Some major advantages of using a LCD monitor include: • These monitors are compact, light in weight and do not consume much desk space. • Secondly, these monitors do not consume much electricity and can even be operated by using batteries. • Also, the images transmitted by these monitors do not get geometrically distorted and have little flicker. However, LCD monitors do have certain disadvantages. Most importantly, these monitors are very much expensive. Secondly, image quality is not constant when viewed from different angles. Also, the resolution of an LCD monitor is always constant. Any alterations can result in a reduced performance. Computer output devices deliver data that has been processed by the computer to the user. There are a variety of devices that produce data in different forms including audio, visual and hard copy. Computer output devices are types of peripheral hardware connected to a computer, using cables or over a wireless network. Monitor

o The most common computer is the monitor or computer screen. Monitors create a visual display from processed data that users can view. They come in a variety of screen sizes and visual resolutions. There are two types of computer monitors, CRT and flat panel. CRT monitors use phosphorescent dots to create the pixels that make up display images. Flat panel monitors usually use LCD or plasma to create output. Light is passed through liquid crystals to create the pixels. All monitors rely on a that is located on the computer or in a special expansion slot. The video card processes the computer data into image details that the monitors can display.

o Printers produce a hard copy version of processed data such as documents and photographs. The computer sends the image data to the printer, which then physically recreates the image onto an object. There are three types of computer printers: ink jet, laser and . Inkjet printers spray tiny dots of ink on a surface to create an image. Laser printers use toner drums that roll through magnetized and then transfer the pigment to a surface. Dot matrix printers use a print head to imbed images on a surface, using an ink ribbon. Speakers/Headphones

o Computers produce audio data that require output devices such as speakers and headphones to deliver the sound to the user. Audio data is created by the computer and then sent to the audio card, which is located in an expansion slot. The card translates the data into audio signals, which are sent to the audio output device. CD/DVD/Floppy Disc

o CD, DVD and floppy disc are output devices that can also be used as storage and input devices. The computer sends data to the disc, where it is embedded and can be later retrieved. , or CD, is an optical device that stores audio and visual data in a digital format. Data is placed on the disc, using a laser writer that embeds the data into the disc's coating. Digital Versatile Disc, or DVD, is an optical device that stores visual data in a media format. feature a dual coating system that allows audio and visual data to be written at the same time by using a laser. Floppy disc is a magnetic storage device. A layer of magnetized material is placed within a proactive plastic casing. The computer embeds the data into the magnetized material, using a writing head. Projector

o Projectors are display devices that project a computer created image. The computer sends the image data to the video card which then sends the video image to the projector. They are typically used for presentations or for viewing .

o create a hard copy rendition of a digitally rendered design. The design is sent to the plotter via a graphics card, and creates the design using a pen. Generally used with engineering applications, plotters basically draw an image using a series of straight lines.

Read more: Examples of Output Devices of a Computer | eHow.com http://www.ehow.com/about_5300348_examples-output- devices-computer.html#ixzz1Sde7WET4

Hard copy dvices

There are two major categories of hard copy devices. i)Printers ii)Plotters

PRINTERS

Printers produce output by either impact or non-impact methods.Impact printers press formedcharacter faces aginst an inked ribbon onto thg paper. A line printer is an exapmle of impact device. Non-impact device printers and plotters use laser tecniques, inkjet sprays, Xerographic process, electrostatic methods and electro thermal methods to get images onto the paper.

Types of printers

*Dot matrix printer *laser printer *Inkjet printer *The electrostatic printer *The electro thermal printer

Dot matrix printer

It has a print head containing a rectangular array of protruding wire pins,with the number of pins depending in the quality of the printer.Individual characters or graphics patterns are obtained by retracting certain pins so that the remaining pins form the pattern to the printed. Laser printer

Alaser beam creates a charge distribution on a rotating drrum coated with a photo electric material, such as selenium.Toner is applied to the drum an then transfered to paper.

Inkjet printer

It produces output by squirting the ink in horizontal row across a roll of paper wrapper on a drum.The electrically charged ink stream is deflected by an electric field to produce dot matrix patterns.

The electrostatic device

It places a negative charge on the paper,one complete row at a time along the legth of the paper.Then the paper is exposed to a toner.The toner is positively charged and so is attracted to the negatively charged ares, Where it adheres to produce the specified output.

The Electrothermal Device

This method uses heat in a dotmatrix print head to output patterns on heat sensitive paper.The printer of the invention permits high rate printing at a relatively low cost of supplies. With the ink ribbon omitted, printing can be effected directly on thermo-sensitive paper.A thermoplastic ink is transferred from a ribbon to the base medium (usually paper or transparent film) by localized heating. The heating occurs as current is passed from discrete electrical contacts on the print head through a resistive layer in the ribbon to a common return layer.

Plotters

A graphic printer that images with ink pens.It actually draws point to point lines directly from vector graphics files.The plotter was the first computer output device that could print graphics as well as accommodate full size engineering and architectural drawings.Using different colored pens, it was able to print in color long before ink jet printers beacme an alternative. Pen plotters are still the most affordable printing device for CAD and other resolution unlike any other printer.The lines are not made up of dots .They are actually drawn providing infinite resolution.

Types of plotters

*Drum plotter *Flatbed plotter *

Drum and Flatbed plotter

Both types of plotters actually "draw" the images.The drum plotter wraps the paper around a drum with pin feeds.It moves the paper back and forth for one direction of the plot.The pens moves across the paper, creating other axis.The bed of the flatbed unit determines the maximum size of the total drawing.In drum plotters the pen is moved in a single axis track and the paper itself moves on a cylindrical drum to add the other axis or dimension.

Types of Drum Plotter

*Inkjet *Thermal *LED Flatbed plotter A graphics plotter that contains a flat surface that the paper is placed on. The size of this surface (bed) determines the maximum size of the drawing.A graphics output device that draws by moving a pen in both horizontal and vertical directions over a sheet of paper; the overall size of the drawing is limited by the height and width of this bed.Plotter that uses a drum revolver to move the paper during printing while the actual pen performs the printing.

Drawing pens

Pen plotter use drawing pens that provide infinite resolution because the line are actually drawn.All other peinting devices print dots.Pen plotters print by moving a pen or other instrument across the surface of a piece of paper. This means that plotters are restricted to line art, rather than as with other printers