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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
What is internal interrupt and external interrupt and software interrupt?
Internal Hardware interruptions
Internal interruptions are generated by certain events which come up during the execution of a program. This type of interruptions is managed on their totality by the hardware and it is not possible to modify them.
A clear example of this type of interruptions is the one which actualizes the counter of the computer internal clock, the hardware makes the call to this interruption several times during a second in order to maintain the time up to date.
Though we cannot directly manage this interruption, since we cannot control the time updating by means of software yet it is possible to use its effects on the computer to our benefit. For example to create a virtual clock updated continuously we only have to write a program which reads the actual value of the counter and to translate it into an understandable format for the user.
External Hardware Interruptions
External interruptions are generated by peripheral devices, such as keyboards, printers, communication cards, etc. They are also generated by coprocessors. It is not possible to deactivate external interruptions.
These interruptions are not sent directly to the CPU but they are sent to an integrated circuit whose function is to exclusively handle this type of interruptions
Software Interruptions
Software interruptions can be directly activated by the assembler invoking the number of the desired interruption with the INT Instruction.
The use of interruptions helps us in the creation of programs and by using them our programs gets shorter. It is easier to understand them and they usually have a better performance mostly due to their smaller size. This type of interruptions can be separated in two categories: the operative system DOS interruptions and the BIOS interruptions.
The difference between the two is that the operative system interruptions are easier to use but they are also slower since these interruptions make use of the BIOS to achieve their goal, on the other hand the BIOS interruptions are much faster but they have the disadvantage that since they are part of the hardware, they are very specific and can vary depending even on the manufacturer brand of the circuit.
The election of the type of interruption to use will depend solely on the characteristics you want to give your program.
Since we shall use interrupts for data recovery programming with the help of C language via Interrupt handling with C, we shall discuss only Interrupt 13H, Interrupt 13H Extensionsand Interrupt 21H routines specially. It is not so important to discuss all of the other interrupts and their functions because in C language, easier functions are available to perform most of those tasks. However, the knowledge of Interrupt 13Hand its Extensions is must, for data recovery programming.
What is the biometric scanner?
A biometric scanner is a digital scanner used for imaging biological details. The phrase biometric scanner refers to the various fingerprint readers, palm scanners, retina scanners, and voice scanners used to verify identification.
What is the Difference between microprocessor and chip?
the IC that is organized as a single-chip microprocessor contains only CPU without the other peripherals like ROM, RAM, and I/O ports that comprise a microcomputer, while the single-chip microcomputer is the chip that contains all the components that give the capabilities of the microcomputer.
There isn't any there is 1024kb in a 1mb and 1024mb in 1gb so the is 1024000kb in 1gb
What is analog input or output?
analog out put or input means it will take any value between o- infinite,
or i can explain something changes with the time analogously ,it will not vary discretely ,digital output will be only a on or off,in oscilloscope you will get 5v 0v ,but analog will continuously change with the time,in oscilloscope.ans it can take any desired value,any value.
A keyboard which is connected to the computer by use of a USB cable
How to navigate through different folders in windows?
Best way is to use special file management application. In some version of Windows it is called Windows Explorer. You can also use thirdparty software like Total Commander.
Can you use replace 5V 3.6A ac adapter to 5V 2.6A ac adapter?
Well, trying to clarify your question, if you have a device that normally has a 5V 3.6A adapter, than it likely needs to be able to draw up to 3.6 amps or so for the device to operate normally. So, a 5V 2.6 amp adapter may operate at times, but only when the device is trying to draw less than 2.6 amps. If the device tries to draw more than 2.6 amps than you run the chance of burning out your transformer (the AC adapter), or just not having your device work. Both adapters will put out the 5 volts, but the 2.6 amp adapter will not provide enough current. You can safely use a larger adapter than the 3.6A, as your device will only draw as much current at 5 volts as it needs. On another note, do not try an adapter that puts out the same current but more voltage. Such as 7.5 volts 3.6 amps. This will overdrive your device and potentially burn it out.
Can you use pci express 2.0 in pci express 16 slot?
You cannot use a 2.0 pci express card in a pci express slot because the technology is newer.
For example:
It would be like putting a playstation 3 game into a playstation 2 console.
In what terms are PC power supplies rated?
AT/ATX PC Power Supply Units (PSU) are typically rated in Watts. The Wattage Rating can be in Peak Wattage or Constant Wattage. Every Power Supply has a peak wattage and a constant wattage, but it isn't uncommon for only one or the other to be advertised and not both.
Peak Wattage is how many amps the PSU can give out for a short period of time before overheating. The length of time a PSU can sustain this peak wattage is generally about 30-60 seconds.
Constant Wattage is how many amps the PSU can give out nonstop. This number is always less than its Peak Wattage counterpart. Constant Wattage is usually (but not always) rated at 40c.
For example, if we assume a 75% efficiency between peak and constant wattage, a PSU may be advertised at 500 Watts peak, but may only do 375 Watts constant. When compared to a 450 Watt constant PSU, the 500 Watt peak PSU might sound more powerful at first, but the 450 Watt constant PSU would be able to do 600 Watts peak.
What does the term Debug denote?
It's an old term that has just stuck around.
The story is told of people who were working on one of the early computers. The computer suddenly stopped working and everyone started going over every component individually.
That computer used mechanical relays to make many of the circuits function, and the story is that a moth became trapped in one of the closed relays. Since the moth wing did not allow the relay to function properly it had to be removed before the computer would work.
From that experience came the term "bug". It was said that the computer stopped working because it had a "bug" in it.
Of course it follows that once the "bug" was removed, the computer continued to work. From that came the term "debugging".
The term is used in all aspects of computer hardware and software.
Many programmers and computer professionalsstill use the term "bug" to describe any problem with computer hardware or code.
External is up to six times faster than USB or FireWire?
Esata is up to six times faster pg. 317 a+ guide to managing and maintaining
Why is it important to follow safety precautions when working with weight lifting equipment?
Because injuries caused in weight lifting are very severe , especially joints can be quite easily damaged if safety precautions are not taken.
Touch sensitive pad an input or output?
Input as your using touch to control it and to INPUT data.
Output too- Outputs data.
What does programmable in programmable devices mean?
Programmable devices can be customized by users for their application. Consider the difference between a Read Only Memory (ROM) and a Programmable Read Only Memory (PROM). A ROM is programmed by the manufacturer and delivered to the user. The function of the ROM is the same no matter who uses it. A PROM is a type of ROM that is delivered blank to the user. The user can store a custom program on the PROM to tailor the device for their application. In short, a programmable device can be customized by the user.
What are the features of power supply?
what the characteristic of power supply?
Ans: The electronic part of the Audine camera requires a +/-15V symmetrical power supply. Consumption is 30 mA for the positive voltage and 10 mA for the negative voltage. If possible, the peak-to-peak ripple must be lower than 5 mV. To reduce the electronic noise level, it is recommended to choose a linear type power supply instead of a switching power supply since the aim is to control sensitive electronic circuits such as the ones in a CCD camera. The required power supply can be easily built using 7815-type voltage regulators (for the positive voltage) and 7915 regulators for the negative voltage as well as a transformer, a few capacitors and rectifier diodes.
What is the term for when two processors are employed in a computer?
Word pad and PowerPoint i think it is sorry if i am wrong
What is level 1 2 and 3 cache?
; L3 Cache (Level 3 Cache) This type of cache is becoming more prevalent as microprocessor manufacturers ship more processors with L1 and L2 cache built into the processor. L3 cache is then the extra cache that sits on the motherboard between the processor and main memory, since the processor already contains L1 and L2 cache. Some processors are starting to ship with L3 cache built-in as well to speed up memory operations further. In those cases the L3 cache often sits on a separate area of the die, not built directly into the chip core.
What port connects up to 127 devices?
USB Will allow up to 127 devices per host controller. Usually, a host controller has more than one USB port. The host controller will only allow 127 devices in total (including hubs), so you can not have 127 per port.
