Computer Hardware

Floppy disks have only 1.44 MB of storage space. ZIP disks have upwards of 100MB of storage space and are much more resistant to magnetic damage at the same time. However, due to cost-effectiveness, neither are especially well-regarded for consumer use anymore. CDs and DVDs are inexpensive and for the same price will hold on average an order of magnitude more data.

The only advantage of a floppy disk, is its ability to boot. As far as storage, floppy disks are obsolete. Not even a Word document with enough attachments can fit on one. Most computers can boot directly off the CD ROM. Newer PC's can boot off a USB Key. But when all else fails, the floppy is always there to save the day when you've crashed your system, and need to boot to reformat/reinstall windows.

A network card, or network adapter as it is sometimes called, allows a computer to connect to a network of other computers. These devices will usually have both a physical layer and a data link layer. Ethernet devices will most often have an 8P8C socket where the network cable can be connected.

IRQ 1

While any unassigned and high level port could be used for SSH it is typically assigned to port 22 on a standard setup.

You would need to set up forwarding on that port on your router to the internal IP address in question.

The main purpose of a heat sink is to expel heat from a generating source. Heat sinks work through the process of conductive and convection heat transfer. Heat sinks are a passive form of cooling, as they have no moving parts and require no power.

An OR requires either input or both inputs to be a one.

An Exclusive OR (EXOR or XOR) requires only one of the inputs to be a one and is a zero if both inputs are one.

No.
No PC Express Cards are not interchangeable With PC Cards.PC express cards have new technology than PC cards.But you can easily get an adaptor or converter to allow you to use PC express card as a simple PC card.

The Universal Serial Bus (USB) send the signal serially. This would be slower than handling the data in parallel. Modern advances in processing speed has made the USB as fast as older parallel ports.

The main advantage of USB is ease of use and 'plugability'. You can attach peripheral devices without switching the computer off first. They are 'Hot Swapable'.

There are only four contact pins on a USB socket. Two power and two data lines. This makes it simple, cheap and safe.

I called +1--808--999--9474 Hp Printer support team was very helpful. My home printer is not printing and they gave me an honest answer and told me it's not worth my money to repair. I'm happy there are still local businesses out there that really care. Saved me the hassel to drive it out there. Great customer service +1--808--999--9474.

Thanks Hp Printer Support team +1--808--999--9474.

cpus use up to 140 watts now a days but the graphics card will require a lot as well

http://educations.newegg.com/tool/psucalc/index.html

http://www.antec.outervision.com/PSUEngine

You have to consider the power rating of the motherboard, processor and add-on devices such as video and sound cards. The video and sound cards, for example, take some of the load off of the processor but they consume more power than your typical on-board audio and video chipsets. The best way to go is to at least match the power rating of the old power supply, but you can usually go higher without much added cost. It's best to go higher if the customer had added components or is considering upgrading his motherboard, processor, et cetera but keeping the same case and power supply. Too small a power supply will cause problems such as poor performance and overheating; you won't run into a problem with "too much power" available from the power supply because the computer will only draw what's needed from it.

Serial ports are an old endpoint connector style and signal protocol. USB is an end-to-end universal bus architecture. You can't really compare the two directly, but as USB has in practice generally replaced the RS232 serial protocol, there are some similarities in features to be drawn and compared. * SpeedSerial ports transmit a single bit of information every clock cycle. The clock rates range from anywhere between 150 to 119200 at mathematically convenient intervals. (150, 300, 1200, 2400, 4800, 9600, 14400, 28800, 38400 and 57600 have all been common values.) At 119200bps (bits per second), divided by 8 (bits per byte), that's 14900 bytes per second, or roughly 14.5K/s of total bandwidth. To put that in perspective, an average cable Internet speed cap is about 10Mbps, or about 83 times faster. Common network signalling speed is 100Mpbs, or 830 times the potential of a typical serial port. You could not use these services over a serial connection. On the other hand, USB 2.0 is capable of speeds of up to 480Mbps. That's 480 million bits per second. That's roughly four thousand times the maximum potential speed of a serial port clocking at 119200bps. However, the real speed of USB to or from any particular device generally depends on the device itself, other devices connected to the same bus, or other limitations on the host PC. * Connectivity Serial ports primarily feature D-style connectors of either 9 or 25 pins. They're fairly large by today's standards, and even before USB was introduced it was rare for any system to have more than two. Additionally, only a single endpoint device could be plugged into a single serial port (mouse, modem, printer, data line, etc). USB connectors have a total of four (sometimes five) contacts. This allows the plugs and jacks to be very small. USB has a myriad of physical connector styles for many different types of devices, though they're all still USB standard -- they all speak the same language. Additionally, since USB is a bus and not just an endpoint connector, it can be extended via the use of USB hubs to provide additional connectors for additional devices on the same USB connection (up to 256 per host port). * Availability Due to the smaller size of USB connectors, modern computers may feature up to four to eight or more USB ports, with more connections available via USB hubs. Additionally, a great deal of consumer perphierals are now offered as USB devices. Serial ports and serial devices are now usually relegated to legacy hardware or specialized uses. * Power USB ports supply a 5 volt power line in addition to the signalling lines from which some USB devices may draw in order to power themselves, allowing for lower power peripherals to require only a single connector - USB - instead of having additional cords or cables for power as well. This is particularly important in a portability context; most laptop users prefer not to have to carry plug-in power supplies for every peripheral, as well as having to find an electrical outlet for each one. Smaller devices such as USB card readers or even external hard drives can now simply use a single USB plug to be ready for use. This also allows for additional functionality such as charging a device's battery from the USB connector. (In fact, some devices such as certain models of cellular phones have USB plugs specifially for that purpose; they may not actually communicate at all over USB, they're just using the power from a USB connection to charge the batteries, since USB is now so common and highly available.) * Plug and Play and device abstraction The typical usage model of a serial device involved the controlling software sending commands to and from the serial controller chip (UART), which then communicated over the serial line to the device. The system itself didn't generally know exactly what device was plugged in, or even if there was anything plugged in at all. It simply expected a certain protocol to be followed to and from the COM port, depending on what the software was written for. This was in an age before modern multitasking and OS driver models, and led to many serial devices requiring proprietary software to use at all, which in turn led to many compatibility issues as systems advanced over time and controlling software was not updated, making the device itself unusable. The nature of the USB architecture and the more modern nature of it's controlling hardware allows for USB devices to be added or removed on the fly, and the devices themselves to be directly detected by the host system and, if necessary, drivers installed, just like any other piece of system hardware. The device can then be univerally used in the operating system and with any software designed to operate that class of device (input, audio, storage, etc).

No, it is an input device as it reads (and does not write)

The internet.

More specifically, he is generally credited as the designer of the IP ("Internet Protocol"), along with the associated TCP (Transmission Control Protocol), though several others on the team also contributed non-trivially. These basic protocols form the foundation of the network "language" that allows large numbers of computers to communicate easily.

He also help invent MCI Mail, the first commercial electronic mail system which used TCP/IP and the Internet to send messages.

Also overlooked by many is his large role in founding the Internet Society, one of the main organizations which has helped coordinate the technological evolution of the Internet, and helped insure the Internet did not devolve into a tangled mess of incompatible (or proprietary, locked-in) protocols.

A minicomputer (colloquially, mini) is a class of multi-user computers that lies in the middle range of the computing spectrum, in between the largest multi-user systems (mainframe computers) and the smallest single-user systems (microcomputers or personal computers). The class at one time formed a distinct group with its own hardware and operating systems, but the contemporary term for this class of system is midrange computer, such as the higher-end SPARC, POWER and Itanium -based systems from Sun Microsystems, IBM and Hewlett-Packard.

IA stands for Industrial Standard Architecture and is used for transfer data bits

You will need a Windows install CD or a System Restore CD for this. When you have one put it in the CD drive, turn off your computer, turn it back on, and follow the on screen instructions. If you do not have either of these cds you can call ACER and ask them for a system restore CD for your specific model of computer.

Field Replaceable units, Chinese components (they cheaper to replace than repair).

Well, this depends on the person, as for me, i think Huawei E583C is the best wireless router, this is an article about how to Select Your Best Router:

http://ailsa01.livejournal.com/3717.html

other resource, Huawei E583C:

http://www.modem3g.com/e583c-hotspot-p-57.html

many card readers are that size, some fan comtrollers, and especially a 3.5 floppy drive- but do you use one?. You can also put hard drives there. Are you looking for a case? A good cheap case for beginners is an Antec 300. More beefy cases are Antec 900, CM HAF 932, CM Sniper, Antec 1200, Azza Solano.... But these are reasonable priced cases. Lian Li and others make real nice expensive cases that you may like as well, but I never really looked at them.

A memory cache, sometimes called a cache store or RAM cache, is a portion of memory made of high-speed static RAM (SRAM) instead of the slower and cheaper dynamic RAM (DRAM) used for main memory. Memory caching is effective because most programs access the same data or instructions over and over. By keeping as much of this information as possible in SRAM, the computer avoids accessing the slower DRAM.

Short for Level 1 cache, a memory cache built into the microprocessor.

Short for Level 2 cache, cache memory that is external to the microprocessor. In general, L2 cache memory, also called the secondary cache, resides on a separate chip from the microprocessor chip.

As more and more processors begin to include L2 cache into their architectures, Level 3 cache is now the name for the extra cache built into motherboards between the microprocessor and the main memory.

the l2 cache is now always built onto the processor for x86 archetechure

ultraviolet light, or UV light, is a type of electromagnetic radiation that has a wavelength somewhere between visible light and X-rays. It is widely used throughout the world, in everything from production of usable electricity (the sun's rays are ultraviolet) to the many common uses for a simple black light.

Sun Tanning

All sun tanning beds use ultraviolet lights in order to simulate the effects of sunlight against bare skin. Just like real sun bathing, people who use tanning beds run the risk of developing sunburn.

Hunting

Many hunters will use an ultraviolet light, such as a black light, to locate and follow a wounded animal. This is done by shining the light on the ground and following the illuminated blood trail.

Forensics

Forensic scientists will also use ultraviolet lights to look for clues at a crime scene.

CD/DVD Players

CD and DVD players use lasers, which are a form of ultraviolet light, to read information off of the disc.

Security

To fight counterfeiting, many government or otherwise sensitive documents will have some sort of ultraviolet verification. In other words, if you shined a black light over a $20 bill, you would see markings on an authentic bill that you wouldn't find on a fake.

enjoy................................................ dear..............