Wireless is a technology that connects the two devices to exchange data or voice without using a cable media. The advantages of this technology is to eliminate the use of cables, which can be quite disturbing is aesthetically, and also the complexity of installation to connect more than 2 devices simultaneously. Wireless networks are popular for the construction of the home network, but wireless is not the only way, either wireless or wired home has advantages and disadvantages of each. There are 3 initial standard wireless network, which is used in 802.11b WLAN, 802.11a, and expensive faster than 802.11b and is usually owned by the business networks, and 802.11g is a combination of 802.11b and 802.11a, as well as the new 802.11n standard .

While wired Ethernet cable and use the network adapter. In this network, to connect one computer to another computer in the form of necessary liaison network cable, also hub, switch or router as the central device to handle many computers. Function in the network cable to send information in the form of electrical signals between the network computer.

Here differences wired and wireless:

Installation
Wired, Ethernet cable must be on each computer to another computer or a central device. This often causes complications because of the length of cable required and necessary arrangements to wire the room neat. As for the configuration, wired or wireless networks are not much different.

Wireless, can be configured in 2 ways namely ad hoc networks that can communicate peer-to-peer inter-device or with Infrasutructure the meperbolehkan mode wireless devices can communicate with a central point which then can communicate with wired LAN on the network. Most of Infrastructure mode wireless needs. Both need a Network adapter called WLAN cards.

Cost
Wired. For the cost of Ethernet cables, hubs and switches is quite cheap. Software for connection sharing is also inexpensive and sometimes free. Users must prepare broadband routers (optional), although expensive, because of the ease of installation and safety.

Wireless. Wireless is much more expensive than wired, including the price for its access point.

Reability
Wired. Ethernet cables, hubs and switches, broadband routers also sort can be very reliable because the updates are more mature than manufacturing. Physically, the connection cable can not be affected by interference or disturbance in the existing bandwidth, as happened in the wireless network.

Wireless. Wireless LANs have less reliability than wired LAN, but can be covered if there is already good handling.

Performance
Wired. Wired LAN offers a very good performance. Ethernet was initially only able to offer 10Mbps bandwidth. Fast Ethernet technology now offers a bandwidth of 100 Mbps, although some spend more money. Hub can decrease performance if the network is used continuously. However, this can be overcome by using a switch. Switches are more expensive than hubs, but the performance is better than the hub in order to prevent the decrease in network performance.

Wireless. Wireless LAN with 802.11b provides the same speed as the Ethernet in the early presence of 10 Mbps. However, the wireless LAN 802.11a and 802.11g have 1.5 times the speed of Fast Ethernet. The drawback is distance sensitive wireless farther the computer user from access point or other communication endpoint, it will decrease performansinya. 802.11a and 802.11g suitable for home networks, but not suitable for home LAN gaming.

Security
Wired. For any wired LAN connected to the Internet, firewall security is a primary consideration. Wired Ethernet hubs and switches do not support the firewall, but it can be installed. While broadband routers also provide firewall capabilities are easily configured with software software luggage.

Wireless. Basically, wireless is less secure wired LAN because the signal is broadcast freely and easily captured. However, in practice such as wireless can be secure wired LAN, ie, by adding a password for wireless network settings that are not easily ‘diintip’ by the neighboring users, or by using data protection through encryption standards such as Wired Equivalent Privacy (WEP).

According to Intel spokesman, Bill Calder noted that the focus strategy is to make the Intel brand ‘hero’ with the name of the Intel ® Core ™. After that, the Intel versions and derivatives of the brand Intel Core Core ™ 2 Duo, Core 2 Quad, and so forth. Core processor family to own as there are multi-level processor Intel ® Core ™ i3, Intel ® Core ™ I5, and Intel ® Core ™ i7. I3 Processor Core and Core I5 is a modification and the new Intel Core i7 in the structure of the Core family.

Very important note, that according to Intel, the Core brand to give the signal features and distinctive advantages. For example, the processor will come as Lynnfield (desktop) that will take Intel Core brand, but similar to Intel Core i7 and I5, depending on the features and capabilities. While Clarksfield (mobile) will use the Intel Core i7 brand.

While the Celeron for the entry-level, together with the Pentium for basic computing. While the Intel Atom processor go from the new device, to start netbook smartphone. To purchase a PC, Celeron processor in the entry category good, better Pentium, Intel Core, and represents the best from Intel. Meanwhile, Intel vPro technology to continue to secure the best class and paired with the Intel Core, Core I5 or better Core i7. With the focus to Intel Core, Centrino technology processor brand will ‘break’ for the PC at the beginning of this year. However, the Centrino has a large share of the wireless technology, so it can be transition with the product name Wi-Fi and WiMAX start in 2010.

There are several types of PC Cards. Type I PC Card with 3.3 mm thick is the format used to add RAM. Type II PC Card with 5.0 mm thick is used to add a regular modem and LAN adapter. Type Type III PC Card with a 10.5 mm thick regular use to add a hard disk.

All PC Card has two layers of the interface instructions: card services and socket services. Card service managing system resources needed by the PC Card and determine the irq and address of the memory on the computer. Socket service to communicate directly with the chip PCMCIA control and act as a service to the card. Socket service can be part or the BIOS can be set with special software.

Attendance at this keyboard is also equipped with other types of input device called a mouse. Practice with a video display or monitor also called as the output device, interaction between people with computers can be done.

Keyboard divided into two types, namely type mechanical switch array type structure and a flat layer 3. In the mechanical type switch array, an array of mechanical switch mounted on the printed-circuit board, where the switch is arranged in rows and columns that are connected to the micro-controller on board. At the time a switch is pressed, the controller will be identified and then the column so that the key is pressed.

While in the type structure of the flat layer 3, the top layer consists of a plasticized layer position with the key shown on the top surface and Conducting trace stored on the bottom. Second layer made of rubber with a hole in the key position. While the third layer is metallic down to the protrusion at the position of the button. At the time the button is pressed, then the trace underneath will protrusion in contact with the base layer to form electrical circuits. Fold the flow of electrical circuits will be received micro-controller. This type with the keyboard allows the emphasis of production and cost advantages of the side because it is resistant to the problems of food and liquid spillage. An example is the keyboard type terminal point-of-sale.

Based technology used, the printer can be classified as follows:

• Daisy-wheel: Similar to the typewriter used the plastic or metal (such as a hammer), which is the printing of each letter will print such a letter with a ribbon. The only type of printer can not print the letters and graphics.

• Dot-matrix: this printer to print characters to emphasize the pin on the ribbon ink. Each pin yield point, and combinations of dots form the characters or this illustration.

• Ink-jet: printer ink shed on this sheet of paper. This type of printer can produce text and graphics with high quality.

• Laser: This printer uses the same technology with a photocopy machine. This printer can produce text and graphics with a very high quality.

• LCD & LED: This printer is similar to the laser printer, but uses liquid crystals (liquid crystals) or dioda which emit rays (light-emitting diodes).

• Line printer: printer consists chain characters or pins that print an entire line at a time. This printer is very fast but with a lower quality.

• Thermal printer: this printer using a heated pin to press the paper with heat sensitive. The printer is widely used in calculators and fax machines.

The printer can also be classified based on the following characteristics:

• Quality prints or print the output generated by the printer.

• Print speed measured with characters per second, or pages per minute.

• Impact or non-impact related to the printer system working. Printer technology with a daisy-wheel, dot-matrix and line printers are impact printers, and printers with the technology of laser and ink-jet printer is a non-impact. Second important difference is this type of printer on sound. Impact printer more boisterous than the non-impact printer.

• Ability associated with the printed text and graphics. Some printers can only print text and the other can print text and graphics.

• Font or letter type that can be printed. For example, dot-matrix printers can print only a few fonts. Conversely, laser printers and ink-jet printers capable of printing font that is almost unlimited.

Intel Core Duo CPU and Intel Core 2 Duo CPU, seems already familiar in our ears, and often we hear the second processor has a chip in a laptop or PC. Did you know what the difference?

Core Duo CPU is a dual core CPU first. Core Duo CPU is an overall architecture for Microsoft, using two cores on one chip or two chips in one package. Core Duo running speed slower than the Pentium. Core Duo CPUs are more power sparingly, but proportionate to the upside performance speed performance with a faster clock.

But now comes Core 2 Duo, which has similarities with the Core Duo. Core 2 Duo chip, built using the same process of production and fitness in the same socket as the Core Duo chip. With the Core 2 Extreme place name or alias of the Core 2 Duo Core Duo on the side, then the user will not see the difference.

Chip Core Duo or Core 2 Duo, they both have equal speed bus on the front of the 667MHz, but Core 2 Duo has a clock speed faster, even for the Core 2 Duo chip series have the latest speed of 2.6GHz. Buses at the front communicate between the CPU, RAM, and a few other components. Core 2 Duo also has L2 cách who also owned by Core. However, there is a change in architecture Core 2 Duo chip into silicon, which gives Core 2 Duo is faster in the process. Second chip can be used in laptop or desktop PC.

Core 2 Duo in the computer will run much better than Core Duo, from appearance pictures, videos, and check documents. Improvised speed of Core Duo to Core 2 Duo reached 30 percent. However, there is no difference in the resilience of the notebook battery, including the power consumption of the second chip with the same clock speed.

Core 2 Duo chips are basically more expensive than the Core, and Core practice has now disappeared from the desktop market now. However, it is very surprising for this time, the user can obtain a 2.13GHz Core 2 CPU, which is much cheaper from the 1.66GHz Core CPU. However, some still use the laptop Core CPU. Performance laptop that uses Core Duo, is still quite good, so that the user will not feel second-class use with the Core Duo.

FPM RAM (Fast Page Mode DRAM)
Fast Page Mode DRAM DRAM is the oldest model. Problem that often arises from FPM DRAM is a slow transfer speed the maximum 50MHz.

EDO RAM
EDO RAM can provide the performance of the system 50% faster than the DRAM. EDO RAM as FPM DRAM, with some built chace to chip. Like FPM DRAM, EDO RAM has a maximum speed of 50MHz EDO RAM uga should require L2 cache to make everything run faster, but if the user does not have it, the EDO RAM will run much more slowly.

SDRAM (Synchronous DRAM)
Almost all systems use voltage 3.3 volt, 168-pin SDRAM DIMM is. SDRAM is not an extension of the series EDO RAM is a long time, but it is a new type of DRAM. SDRAM running start with the transfer speed 66MHz, while page mode DRAM and EDO akan longer running in the 50MHz maximum. SDRAM can now run at speeds of 133MHz (pc133), and bakan up to 180MHz or higher. To speed up the performance of processor, RAM and the new generation, such as DDR and RDRAM are usually able to support better performance.

DDR (Double Data Rate SDRAM)
DDR is basically transfer speeds have doubled from the SDRAM. DDR will operate in the 333MHz, 166MHz with the actual operation of the * 2 (aka PC333 / PC2700) or 133MHz * 2 (PC266 / PC2100). DDR RAM is also compatible with SDRAM physically, but uses the same parallel bus, so that makes it easier implemnetasi than RDRAM, which is a different technology.

Rambus RAM (RDRAM)
Besides the price is quite expensive, Intel RDRAM provide for customers, and is a popular choice for the Intel Pentium 4 memory. RDRAM is a serial memory technology that comes with three options, ie, PC600, PC700 and PC800. PC800 RDRAM is designed with a double maximum transfer speed of PC100 SDRAM, but have high latency. RDRAM has a multi-channel, such as the Pentium 4 motherboard, which can offer a good memory function, especially when paired with PC1066 RDRAM memory.

Virus
Essentially, the virus is a computer program. With a little ‘monkey’ of the virus, the virus can slow computer performance, or cause damage to the image or display a pop-up ads that are not desired. The virus can produce itself to other programs, usually in the form of executable file (. Exe), ie, a file that the application should be executed. Virus does not run until you run the file. Exe is. While other file extensions such as. Bat,. Com, and. Exe is also often used by the virus, only to deceive you. The good news, the virus only in the trigger-by-file in the attach, so the need for action from the man pass it on.

Worm
Worm is actually a special type of virus. Unlike most viruses, worms do not require human interaction to pass it on. Worm stand alone and does not require the interaction of the self, such as executable files. Worm can replication himself and pass it on to another system. Many of the worm is designed to extract email addresses that are stored and sends itself to those who saved contact list in your email. The good news, to protect the email, you can create a false email address, to test the existence of the worm. Computer worm does not attack directly, but flooding the contact list you, and to flush bandwidth, network and create a clog.

Trojan
A Trojan horse, such as the Greek legend, is a program that is intended for something that is not harmful, but can be dangerous if you download it. Unlike viruses or worms, Trojan replication not himself or infected other system. However, once Trojan infected computer, it will ‘backdoor’ on your computer, that allows other people can log in to access your computer system. If you have backdoor, hackers can even print documents from your computer, open the CD tray or change the desktop image, and the worse that can access a file important.

The first time, the network has several Internet ARPAnet node at the University of California at Los Angeles and Stanford University. In 1989, Tim Berners-Lee is the first time showing the World Wide Web. He wrote the first web server, as a program that can be used as a web browser and an editor. Internet is a global computer network, while the World Wide Web (WWW) using HTTP (hypertext transfer protocol) as a method to share information on the Internet. WWW is the other method with SMTP (Simple Mail Transfer Protocol), FTP (File Transfer Protocol) and Internet Relay Chat (IRC). While examples of the first Internet service provider CompuServe is and PSINet.

Type
There are four basic types of Internet services. Dial-up, ISDN (Integrated Services Digital Network), Digital Subscriber line (DSL) and cable. Mode Dial-up service is the most with the slow download speed limitation of 56Kbps (Kilo bite per second). While ISDN offers speed 64Kbps, DSL service is the next fastest with a speed of 128Kbps download. For the cable has high speed up to 30Mbps.

Unlike dial-up connections, DSL and cable connections more open over time and making it easily attacked by viruses and hackers, so that antivirus software should be fixed in the update routine. In addition, older computer with a slow processor and memory capacity of a little connection to the Internet faster, it will make the connection slower.

Benefits
DSL connection has the same price or less than dial-up. You can also use the phone and surf the web in the DSL at the same time, while in the dial-up, you had to disconnect Internet when using the phone. If you download or upload large files, or watch streaming video or spend a long time to surf the web, then the DSL connection is not enough to do so. Therefore, the need to use a connection via cable to increase speed.

RISC (risk-red), is a continuation of the Reduced Instruction Set Computer. RISC chip built starting mid-1980 as a CISC chip. RISC philosophy is in no chip using assembly language instructions are complex, as used in the CISC. An example is the use of chip RISC CPU on Apple. Therefore, simple instructions that will be faster and better than large, complex and slow as CISC. RISC other advantages because of the simple instructions, the RISC chip only has a few transistor, which will create a simple RISC designed and manufactured for cheap to write a compiler that powerful.

RISC provides convenience in the hardware, but in more complex software. Software developers must write the RISC many friends for the same task. Therefore, the RISC architecture design may not be the best in the future, after the occurrence of the CISC chip that is faster and cheaper. However, RISC has been exist for more than 10 years and has been slam the market CISC. According tomax7.com, about 75 percent of processor-based CISC architecture, and most of them is the standard x86. However, the current RISC chip also has a lot of instruction, almost the same as the CISC chip. For example, the PowerPC 601-based RISC architecture, support more than instructions that use the Pentium chip CISC.