Posts filed under: ‘Computer‘




Personal digital assistant(PDA)

  1. Also known as pocket computers or palmtop computers, palm pilot.
  2. Many uses: calculator, clock, calendar, access internet, intranet, extranet via wi-fi or WWANS(wireless wide area networks, for  emailing, video recording, typewriting, word processing, as address book, scanning barcodes, as radio or stereo, playing comp games, GPS(global positioning system), as mobile phones, web browsers, portable media players.
  3. They have touch screens for entering data, a memory card slot for data storage & for connectivity IrDA or bluetooth or wifi
  4. Includes software for appointment calendar, to do list, address book for contacts & some sort of note prog.

User with Treo (PDA with smartphone functionality)

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Add a comment November 5, 2007

computer drives & storage

  1. Over time, files and applications become scattered in various places on your hard disk. Disk Defragmenter brings these scattered pieces together to improve speed and help prevent errors.
  2. Hard disks can be partitioned to run separate operating systems on the same disk, or to break down a disk into manageable chunks for storage. Partitioning is performed on a new or reformatted disk.
  3. C drive is typically the start-up drive; however, you can start up the computer with a different drive, such as another hard drive or a CD-ROM drive. You can designate the start-up drive in the CMOS setup screen.
  4. When you need more disk space, it is easier to add a second hard drive than it is to replace the existing drive.
  5. An external hard drive is recommended if it is used primarily to store backups, transport data to another PC or secure important data. An external hard drive also provides you with additional free space to store and run other important programs
  6. If your CD-ROM drive is not recognizing that there is a disc in the drive or your CDs are skipping, it is time to clean the CD-ROM drive. Clean your CD-ROM drive every 3 months to make sure it is free of dust, hair and other debris.
  7. LightScribe is a new technology that is hitting the mainstream by storm. It is easy to do and a great way to label your CD’s. The CD burner on your computer laser etches a picture, work of art, or words directly onto the top portion of the CD.
  8. Write all of ur blog entries in a word processor & save them on ur comp before posting. Alternately, copy the txt from ur blog post into a word processor doc after posting, & save the files all in one place.
  9. Don’t want to do the backups manually? Consider downloading software like Webgrabber to do the backup for you automatically.
  10. Zip drives are some of the most popular removable-media storage devices. A lot fits on one disk, the disks are easily portable and the drives are fairly inexpensive.

1 comment October 30, 2007

workstation

  1. Connecting a workstation to a server is a great way for a group of people to share info & peripherals (such as printer) without leaving their own desks.
  2. Bldg a custom workstation gives the opportunity to make sure all of the components u want r included.

Add a comment October 30, 2007

servers

  1. If you have multiple computers that share files, you may wish to set up a home server. You’ll be able to access files from any of the computers, and you can store and back up files in a common location.
  2. To prevent your server from crashing, you should perform a load test on your server. A load test allows you to see exactly how many simultaneous web users can access your server without delays.
  3. Sometimes, you need to transfer your UNIX server files to a Window-based server.
  4. Telnet is a very unsecure protocol and passes passwords in plain text, you should disable this – but only do so after you have setup SSH and it works afterwards. Having a Firewall (APF) is a must have
  5. If you’d like to test code you have written, you may want to set up a home development server. This way, you can see how the code responds to user traffic without having to use a live server
  6. With a home-based Web server, you can host your own Web site, file server or blog on your own terms.
  7. If you have a home computer that functions as a Web server, you may want to set up multiple domains. This may sound complicated, but you can do it with a little bit of knowledge and some software.
  8. To set up server, make a list of the hardware u’ll need to buy ur home server. An older comp is the ideal centerpiece for this type of project. You will also want a multi-core processor, as much RAM as u can afford, a router & a high-capacity/high-speed hard drive. Decide whether your current Internet service can provide enough bandwidth to suit your needs. Keep in mind that many ISP services have limits on the amount of traffic you are allowed each month. Decide which operating system you are going to use for your home web server. Windows 2000, NT or XP will suffice for most home Web servers.

    Shut down any software firewalls you have running and install an HTTP server program such as Apache HTTP Server.

    Configure your HTTP server software to share documents or applications from the correct folder on the computer. To do this, you will have to edit the following file: C:\Program Files\Apache Group\Apache2\conf\httpd.conf.

    Locate and edit the httpd.conf file as follows (example given would share your music folder)
    #DocumentRoot “C:/Program Files/Apache Group/Apache2/htdocs”
    DocumentRoot “C:/Larry/My Music”
    And
    #<Directory “C:/Program Files/Apache Group/Apache2/htdocs”>
    <Directory “C:/Larry/My Music”> .

    Locate the command line “AllowOverride None” and change it to: “AllowOverride All.” Save the httpd.conf file. Create a password to protect your Web server.

1 comment October 30, 2007

Network eqpt

  1. Bluetooth technology has become increasingly simple for those with Pocket PCs such as iPAQs to communicate with one another.
  2. You can use HyperTerminal to download a file from a remote computer.
  3. For your Hewlett Packard laser printer to run efficiently, you may have to install a driver. Drivers link the computer and the printer through a common language.
  4. An Ethernet crossover cable connects computers together instead of a hub, network switch or router.

Add a comment October 30, 2007

Wireless router

  1. Figure out no of ports reqd in wireless broadband router by determining no of comps that need to be connected to it.

  2. Remember to include all devices such as desktops, laptops,  PDAs.

  3. Wireless broadband routers usually have LAN ports to allow connection to comps (or a network switch) through cables in addition to a wireless antenna. If ur comps r equipped with wireless LAN cards, they do not need to be connected to  wireless broadband router through cables.

  4. Determine the wireless std used by ur Internet Service Provider (ISP) which gives u an idea of the rate of data transfer. This way, routers supporting the reqd data transmission rate can be explored. For instance, acc to the 802.11a & 802.11g wireless networking stds (also known as Wi-Fi), 54Mbps shd be the max data transfer rate. Both the stds however prescribe diff operating freq’s. Newer versions of 802.11g even specify a transmission rate of 125 Mbps & higher. In contrast, 802.11n, the draft of new wireless networking std, specifies data transfer at speed of 540Mbps.

  5. Ensure data security in wireless network by purchasing a Wired Equivalent Privacy (WEP) compatible router. Security is of prime concern in wireless networks. WEP, data encryption protocol for wireless networks secures data transmitted over radio signals. Wireless data security ensuring protocols more advanced than WEP offer Wi-Fi Protected Access (WPA) & WPA2 with WPA2 offering the max level of security in wireless networks.

  6. Evaluate if u want a wireless router with an external or internal antenna. An external antenna gives better signal transmission, but may be cumbersome to carry around if user is freq’tly mobile. Some wireless routers with an internal antenna have a port where an external antenna can be attached.

  7. Assess other features of wireless broadband router. Aside from connecting networks & enabling Internet connection sharing, routers can perform several other functions. Routers typically determine the shortest path of a data pkt to its destination.

  8. Some routers additionally function as hubs or switches, provide additional firewalls & support port forwarding ability reqd to host a Web server. Remember that routers with more features also cost more.

  9. Check the interface of wireless router with ur comps. In case of a single computer, u can connect wireless router with an Ethernet cable, a USB cable or simply through the antenna. In case of Ethernet cable, ur comp shd be equipped with a LAN card with an Ethernet port. In case of USB router, u simply need a USB port on ur comp. If ur comp has a wireless LAN card, u do not need any cables to connect — the antenna of the wireless broadband router would communicate directly with ur wireless LAN card. If connecting the router to a switch or a hub, the switch must either have an Ethernet port (all switches have this port) or have a wireless antenna.

  10. Call ur ISP after identifying a router. Check with the service provider if they sell the reqd wireless broadband router. Sometimes, ISPs lease routers for an extra monthly charge. If u need a multi-feature high-end router beyond ur budget, leasing it in the beginning might be better option.

  11. Alternatively, buy the wireless broadband router from online vendors, a list of which will be available in the above-mentioned buyers’ guides. Browse through popular online stores such as CompUSA, Best Buy and Circuit City.

Add a comment October 30, 2007

Input & output devices

  1. Ripping DVDs is somewhat difficult in the age of digital piracy. It’s in a moviemaker’s financial interest to make it difficult to reproduce movies in any way. However, it is your right as a consumer to exercise your fair use of your own DVDs.
  2. Wireless networks r the latest entrants in the field of mobile computing. Wireless networks use wireless broadband routers to provide broadband wireless Internet connection to comps &  LANs.
  3. DVDs (digital versatile drives) r fast becoming the most preferred storage device. DVD drives r necessary for playing a DVD. You would need to buy an external DVD drive if ur comp doesn’t have one already.
  4. Spilling coffee on your laptop will not only ruin your morning, it can ruin your computer. Act quickly if this happens, because it only takes seconds for liquids to destroy the hard drive of a laptop computer
  5. A KVM switch (Keyboard, Video and Mouse) is a hardware device used for sharing a keyboard, monitor or mouse on multiple computers. You can connect and control multiple computers through a KVM switch.
  6. A wireless modem provides higher flexibility and mobility, allowing you to access the Internet from a laptop computer anywhere in your home or office.
  7. Universal Serial Bus (USB) drives are compact. They’re connected to computers’ USB ports to transfer data between machines. These drives are compatible with almost all the operating systems.
  8. Zigbee is not a company but a group of companies selling new technology. Zigbee is like BlueTooth; it’s a technology with wireless capability. The difference is that Zigbee utilizes radio waves.
  9. Hama Data Switchbox 4:1 can be used to connect up to four computers to one USB device, such as a printer, digital camera, scanner or other peripheral.
  10. A direct cable connection between two computers allows a user to exchange large files without having to go through a modem or interfacing device.
  11. Boost your low end by adding a subwoofer to your PC speaker configuration. Most new speaker sets in the mid-priced range already come with a subwoofer.
  12.  USB organizer is a hanging device that stores USB components and wires. The organizer keeps USB devices and cables together. It stores the many cables while keeping them handy
  13. A graphics tablet can provide graphic artists with more designs, flexibility and creativity.

Add a comment October 30, 2007

upgrades

  1. It’s a well-known fact that adding more MEMORY to a computer is the easiest, cheapest and most bang-for-the-buck upgrade that can be done
  2. DSL (Digital Subscriber Line) modem uses a copper wire transmission technology to access high speed broadband Internet over telephone lines. Although DSL internet connections use a phone line, you can talk on the phone and surf simultaneously
  3. If your computer slows down when you’re working with large files or many programs at once, you might be able to improve performance by installing extra RAM (Random Access Memory – your computer’s temporary operating memory). The best way to improve your computer’s performance is to add random-access memory (RAM).
  4. To increase the random-access memory (RAM) of your computer, you must know the type of RAM it uses, how the RAM is presently configured and how many open RAM slots are available
  5. You need a fast, high-end 3-D video card for action games, graphic design, CAD, 3-D modeling and image editing. 3-D acceleration is now a standard feature on video cards
  6. If you use a laptop extensively, it makes sense to invest in an external keyboard. A wireless keyboard is easy to carry along wherever you go, just like your laptop
  7. A USB wireless modem is a device used for accessing wireless internet on a desktop computer. A USB wireless modem (that uses a USB cable) is recommended over an Ethernet wireless modem (that uses an Ethernet cable)
  8. Broadband wireless Internet connections are ideal for laptops, making them entirely mobile with a cable-free internet connection. Choosing the right wireless modem depends on compatibility with your your wireless Internet provider.
  9. A SCSI Zip drive is faster than any other Zip drive. Windows 95 or 98 should automatically recognize a SCSI card and devices connected to it
  10. An Inkjet printer with duplex printing will allow you to reproduce office-quality copies at home.

Add a comment October 30, 2007

Power souces

  1. A computer has a battery or special chip that retains computer (CMOS) settings and runs the computer clock even after the computer itself is turned off.
  2. An uninterruptible power supply (UPS) is the most effective way to protect your computer hardware and documents from power fluctuations. It also lets you continue to work during brief power failures
  3. The power supply governs the stability, cooling, energy efficiency, and expandability of your computer, and will affect the reliability of your components.
  4. Surge suppressors are essential for computer systems. They protect the computer against increases in voltage, although most won’t protect against drops in voltage. For that, you need an uninterrupted power supply.

Add a comment October 30, 2007

Monitor

  1. The Liquid Crystal Display [LCD] technology in a monitor uses a liquid crystal solution between two sheets of polarizing material, which align the crystals when an electric current is passed. Pixels are the vertical and horizontal dots.
  2. A high monitor resolution shows more detail, but individual items appear smaller onscreen. A low monitor resolution shows less detail, but items appear bigger. 
  3. There are two types of monitors—the Cathode Ray Tube (CRT) and the Liquid Crystal Display (LCD). LCD monitors are preferred over CRT monitors because they use advanced technology, are compact, light in weight, sleeker
  4. Most computer monitors contain cathode-ray-tubes which are known to contain at least five toxic materials. The toxins are safely locked in the monitor normally, but when it is crushed or burned these toxins are released damaging the environment.

  5.  Extended desktop is 2 or more monitors displaying as a single computer desktop. Once you use for a week, you can’t live without it.

  6. A tablet PC is easily portable and handy for all your computing needs. What’s more, when you want to use it as a desktop computer with a bigger display, you can easily connect it to an external monitor

1 comment October 30, 2007

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