0
Computer Hardware
Computer hardware is a general term used to refer to all the physical parts of a computer. Internal hardware devices include hard drives and motherboards, while external hardware devices include monitors, mice, keyboards, and printers.
11,849 Questions
At what point in the boot process is BIOS information displayed?
The boot processes are displayed at start up. This stage often shows hardware information such as CPU and RAM. Soon after the computer will display an option for a BIOS menu via key F10. If this option is not selected the computer will automatically load the operation system (OS) or offer OS selections.
Difference between data bus and data control bus?
An Address Bus gives the memory instructions on where to place the actual data that it will stored or read. Basically a map location. The Data Bus carries the information that is going to be stored or read using the location that the Address Bus gave to the memory.
Address bus is unidirectional while data bus is bi directional
What the options on the Windows 9xMe startup menu?
1. Normal
2. Logged (\BOOTLOG.TXT)
3. Safe Mode
4. Safe Mode with network support
5.Step-by-Step confirmation
6.Command prompt only
7. Safe mode command prompt only
8. Previous version of MS-DOS Normal- starts Windows
Logged - same as normal except it logs the startup and load activities
Safe Mode - used to troubleshoot problems with Windows
Safe Mode with network support - same as safe mode but allows network access incase you need to download something from the network (NOT available for Windows 98/ME because they automatically include network support)
Step-by-Step confirmation - asks for confirmation before executing each command in the io.sys, config.sys, and autoexec.bat
Command prompt only - Windows 95/98 doesn't start, instead a command prompt starts ( NOT available with Windows ME)
Safe mode with command prompt - doesn't execute commands in autoexec.bat or config.sys, instead you only see the DOS prompt (NOT available with Windows ME)
Previous version of MS-DOS - loads a previous version of DOS if available (NOT available for Windows ME or Windows 98 SE)
Is a network card input or output or an both?
It would definitely be both. Output because it sends out information, and input because it then receives information.
Is it OK to write on a DVD r with a marker?
You can use a marker to label your DVD-R (or DVD+R). Simply make sure you are obviously not marking on the side of the disc that you are burning on. If it's a double-sided DVD, then you're obviously not going to mark on either side.
Also make sure you do not use a sharp tip marker which may damage or scratch the surface of the DVD. A standard Sharpie marker should do the trick.
How many devices can be connected to USB controller in a system?
127 USB devices are supported by one host controller.
Is The USB port is hot swappable?
USB ports do in general, but it's mostly the device you are plugging in that matters. So you have a USB hard drive, you can't just unplug it in some scenarios, you have to dismount it first, but this doesn't mean you have to dismount your usb mouse first before unplugging.
What is an LPT1 on a computer?
It is a device file used for Parallel port. Consider the following command dir >prn (or) lpt1 dir >com1 dir >com2 that is the input is sent to the specified device file or device or a file.
What is the device manufacturer for the ethernet device 00 C0 4F 49 68 AB?
i need to find the device manufacturer for the following ethernet devices 00-CO-4F-49-68-AB, 00-0A-27-B7-3E-F8, 00-04-76-B6-9D-06, 00-00-36-69-42-27
a= Dell Computer Corporation. b= Apple Computer, Inc, c= 3 Com Corporation. , d= ATARI Corporation
you can also look up the information here http://standards.ieee.org/regauth/oui/oui.txt
Answers here:
http://www.cn.kagawa-nct.ac.jp/~kmanabe/ethers.html
Is the user interface hardware or software?
Depends. There are hardware which are input and hardware that are output. eg:
Input hardware:
Scanner
Microphone
CD player (Not CD-RW)
Output hardware:
Speakers
Printer
Monitor
Which precaution should be taken before any electronic component is removed from a computer system?
make sure that the computer is unplugged
What is mean by HUB Define it?
A HUB is typically the least expensive, least intelligent, and least complicated of the three. Its job is very simple: anything that comes in one port is sent out to the others. That's it. Every computer connected to the hub "sees" everything that every other computer on the hub sees. The hub itself is blissfully ignorant of the data being transmitted. For years, simple hubs have been quick and easy ways to connect computers in small networks.
What are the major differences between cable modems and DSL modems?
Cable modem connects through fibre optic DLS through phone line. Cable boasts faster speed than DSL Internet in theory. However, cable does not always deliver on the promise in everyday practical use. Cable modem services can slow down significantly if many people in your neighborhood access the Internet simultaenously. Both cable modem and DSL performance vary from one minute to the next depending on the pattern of use and traffic congestion on the Internet. DSL and cable Internet providers often implement so-called "speed caps" that limit the bandwidth of their services. Some home networks cannot match the speed of the Internet connection, lowering your performance
How many devices can be connected per SCSI port?
A typical SCSI adapter have targets from t0 to t6 enabling to connect 7 devices. But t6 (last target) is reserved for controller itself so it limts the maximum devices to connect to 6.
You mainly use it for mobile phones, or they can be used with cameras (with adaptors). Micro SD cards are for extra memory on your device.
In computer networking HUB is a small, simple, inexpensive device. Hubs are used to join multiple computer together.
It is a cell or set of cells that are used to do calculations for a function.
What are Interrupts and their types?
In computing, an interrupt is an asynchronous signal indicating the need for attention or a synchronous event in software indicating the need for a change in execution.
A hardware interrupt causes the processor to save its state of execution and begin execution of an interrupt handler. Software interrupts are usually implemented as instructions in the instruction set, which cause a context switch to an interrupt handler similar to a hardware interrupt.
Interrupts are a commonly used technique for computer multitasking, especially in real-time computing. Such a system is said to be interrupt-driven.
An act of interrupting is referred to as an interrupt request (IRQ).
Types of Interrupts
1. Level-triggered
A level-triggered interrupt is an interrupt for which an unserviced interrupt is indicated by a particular state, high level or low level, of the interrupt request line. A device wishing to signal an interrupt drives the line to its active level, and then holds it at that level until serviced. It ceases asserting the line when the CPU commands it to or otherwise handles the condition that caused it to signal the interrupt.
2. Edge-triggered
An edge-triggered interrupt is an interrupt signalled by a level transition on the interrupt line, either a falling edge (high to low) or a rising edge (low to high). A device wishing to signal an interrupt drives a pulse onto the line and then releases the line to its inactive state. If the pulse is too short to be detected by polled I/O then special hardware may be required to detect the edge.
Edge-triggered interrupts do not suffer the problems that level-triggered interrupts have with sharing. Service of a low-priority device can be postponed arbitrarily, and interrupts will continue to be received from the high-priority devices that are being serviced. If there is a device that the CPU does not know how to service, it may cause a spurious interrupt, or even periodic spurious interrupts, but it does not interfere with the interrupt signalling of the other devices. However, it is fairly easy for an edge triggered interrupt to be missed - for example if interrupts have to be masked for a period - and unless there is some type of hardware latch that records the event it is impossible to recover. Such problems caused many "lockups" in early computer hardware because the processor did not know it was expected to do something. More modern hardware often has one or more interrupt status registers that latch the interrupt requests; well written edge-driven interrupt software often checks such registers to ensure events are not missed.
3. HybridSome systems use a hybrid of level-triggered and edge-triggered signalling. The hardware not only looks for an edge, but it also verifies that the interrupt signal stays active for a certain period of time.A common use of a hybrid interrupt is for the NMI (non-maskable interrupt) input. Because NMIs generally signal major -- or even catastrophic -- system events, a good implementation of this signal tries to ensure that the interrupt is valid by verifying that it remains active for a period of time. This 2-step approach helps to eliminate false interrupts from affecting the system.
4. Message-signaled
Main article: Message Signaled Interrupts
A message-signalled interrupt does not use a physical interrupt line. Instead, a device signals its request for service by sending a short message over some communications medium, typically a computer bus. The message might be of a type reserved for interrupts, or it might be of some pre-existing type such as a memory write.
Message-signalled interrupts behave very much like edge-triggered interrupts, in that the interrupt is a momentary signal rather than a continuous condition. Interrupt-handling software treats the two in much the same manner. Typically, multiple pending message-signalled interrupts with the same message (the same virtual interrupt line) are allowed to merge, just as closely spaced edge-triggered interrupts can merge.
5. DoorbellIn a push button analogy applied to computer systems, the term doorbell or doorbell interrupt is often used to describe a mechanism whereby a software system can signal or notify a computer hardware device that there is some work to be done. Typically, the software system will place data in some well known and mutually agreed upon memory location(s), and "ring the doorbell" by writing to a different memory location. This different memory location is often called the doorbell region, and there may even be multiple doorbells serving different purposes in this region. It's this act of writing to the doorbell region of memory that "rings the bell" and notifies the hardware device that the data is ready and waiting. The hardware device would now know that the data is valid and can be acted upon. It would typically write the data to a hard disk drive, or send it over a network, or encrypt it, etc500 MB can mean two thing: 500 MEGA BYTES of main (system) memmory or 500 Mega bytes of storage (disk drive). One Megabyte is roughly the equivalent of one full novel. its not exactly 500megabytes, this is due to each value increasing by itself, eg 1,2,4,8,16,32,64,128,256,512.....etc. Answer A byte is a unit of data storage. A megabyte is 1,000,000 bytes. And 500 megabytes is (of course) 500,000,000 bytes. Data storage comes in many forms (disk drives, memory (properly called RAM), flash memory like USB sticks, etc.) but the term 500 MB means the same thing either way. And yes, data storage that is equal to 500 MB is perfectly possible, the person who gave the second answer seems not to realize that multiples of two do not govern everything. RAM is usually retailed in such units (64 MB, 128 MB, 256 MB, etc.), but other methods of storage have no such constraints (like CDs that hold 700 MB, or floppy disks that hold 1.44 MB). AnswerWhoever gave the 3rd answer is forgetting that there is such thing as File System (FS) on mass Storage devices (such as CD's, DVD's, Harddrives, Floppy Disks etc) which take up space. EG if you get a 1GB Pendrive, it will have 0.99GB Space because the file system will take up the 0.01GB. So if you are looking at 500MegaBytes of RAM, there is a different type of file system, which is NOT stored on the RAM sticks, which means you get the full 500MB. :-)
Answer Is this kid serious asking this question? Yes their is such thing as 500 mb. Some people should not be allowed to own a computer...
Why are external modems more expensive than internal devices?
An internal modem consists of a card that is installed in the computer, it has no additional wires or hardware. An external modem is more expensive to produce because, in addition to the card, there is the plastic housing that contains it, indicator lights, and cables to connect it to your computer.
Yes - what matters is the voltage - it has to be the same. The device will only draws 1A as needed - the adaptor with higher amp,i.e, 2A is fine. As long as the adaptor has amps equal to or greater than
those of the device, it will be ok!
Difference between hard disk and flash memory?
A Floppy Disc (by definition) holds a maximum of 1.44 MegaBytes (1,440,000 Bytes) of data whereas a flash drive starts at 500 MegaBytes 500,000,000 and can hold as much as 8,000 MegaBytes 8,000,000,000 (8GB) of data. ... SIZE .. DOES .. MATTER. :-)
