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Today , 2007
November 12th, 2007

Lapping It Up

The idea of a laptop, or portable, computer was first conceived by Alan Kay, who worked for Xerox, at its Research Center in Palo Alto CA. He called it a Dynabook. He wasn’t the first to offer a completed laptop computer for public consumption, however. That honor went to Grid System’s William Moggridge in 1979. His brand new concept was housed in a magnesium case that was die cast. Its bubble memory was a total of 340 kilobytes. The laptop also had a luminescent folding graphics display screen.

A vastly improved laptop computer was the 1983 brainchild of Gavilan computer. Their latest version offered DOS as well as their very own Gavilan operating system, 64 kilobytes of RAM, was expandable to twice that, an 8088 microprocessor, a touchpad mouse and even a printer. The laptop and printer together weighed a hefty 15 pounds, although the laptop was a reasonable 9 pound weight.

In 1984 Apple got into the laptop act, premiering its Apple llc. Although notebook size, it was still at the high end of the comfort scale, weighing in at 12 pounds. And, as always at the start of an electronic revolution it wasn’t cheap - retailing for $3500. The Apple llc had an 8088 microprocessor, 256 kilobytes of memory (certainly tiny by today’s standard but a massive step up at that time), two floppy drives ( 3 1/2″, not 5 1/4′), space for the installation of an internal modem (not part of the original packaging), and both parallel and serial ports. It even included its own applications for telephone and address book, word processing, appointments, and calculations. It earned rave reviews and the age of the laptop was born.

Soon after IBM and its shadow, Toshiba jumped on board the laptop bandwagon.

Today’s laptops of course are far more advanced, less expensive, and smaller than these early versions. But when you’re looking for your own laptop many of the features offered by these pioneers are still the ones you’re going to want to research for your laptop purchase today. Here’s what you’ll need to compare before you make your laptop purchase:

Microprocessor - This is the brain of your laptop, the part that tells the other parts to get going and do their job. The best microprocessors now available are Pentium, the latest a Pentium IV. A step down from Pentium are the Celeron and AMD versions. Which product you choose determines the speed of your laptop. Pentium is the best and therefore the fastest. Much depends on the use you’ll be making of your laptop.

Operating System - this group of instructions, preprogrammed, dictates functions to the microprocessor. Power and security variances are determined by your choice of operating system.

RAM and VRAM - Random access memory (V is for video), should be a minimum of 126 MB to accommodate today’s software programs.

Disk drives - The newest laptop versions will have DVD or CD drives and no floppy drive. They hold more, weigh less and last longer. Remember, however, that you may have backed up your old PC with oodles of disks. If that’s the case, rather than back up all over again you may want to purchase an external floppy drive for your laptop.

Modem - While some laptops offer external modems, the easiest to use is one with want an internal 56k modem.

Alan Jason Smith is the owner of http://www.tkcicomputers.com which is a great place to find computer links, resources and articles. For more information go to: http://www.tkcicomputers.com.

© Copyright 2005

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November 12th, 2007

Wireless Networking - Router Vs Access Point

While planning for your wireless network you might be asking what is the difference between a router and an access point. You need to think of a router as more of a server because it performs many functions like a server. An access point only provides a portal for wireless client to connect to your existing LAN.

Routers can perform many functions. Routers can connect many different WLANs together acting like a traffic cop. Routers also act as a DHCP server. A DHCP server assigns dynamic IP address to your computer every time your computer starts up. If you don’t have a DHCP server then you will have to assign each computer on your network a permanent IP address.

As I have said before your router can also act like a traffic cop. You can use a router to perform port forwarding to certain computers on your LAN. For example you can direct all internet traffic looking for your game server’s port number to a specific computer on your LAN.

The ability to connect multiple computers to the internet is one of the main features of a router. The router is assigned one WAN IP address from your ISP. This IP address is called a public IP address that everyone on the internet can see. Because you have multiple computers connected to your router the router uses a protocol called NAT {Network address translation} NAT will assign the computers that are behind your routers IP address, private IP addresses. NAT acts as a firewall because computers on the internet cannot in theory even see your computers. They will only see the IP address of your router. NAT does block traffic from reaching your computers but it will not block Trojans from going out to the internet. That is why I do recommend installing a firewall on your LAN computers.

The role of an access point on a LAN is to give the wireless user a door way to enter. The more people that enter the door at the same time the slower they will go. 802.11b access points say they will give you a through put rate of 11mps but the actual rate is around 5MPS. 802.11g has a rating of 54mbps with an actual through put of 20mbps. The access points do have most of the same security features as a router such as WEP, WPA, 8021x and TKPI but they will not have the traffic cop functions like a router. Also the access points will not have NAT which would add an unnecessary layer to your network. To keep it simple access points just simulate plugging in your laptop to a port in the wall and that’s it.A router is used on the border of you network to act as a traffic cop deciding who can come in and blocking those you want to keep out.

Eric “The Wireless Ninja” Meyer is an expert in Wireless Networking. You can view other Wireless Networking articles at http://www.wirelessninja.com

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