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Computer Memory

The computer memory is a physical device used to store data or programs for use in a computer. Some types of computer memory include RAM (random access memory), ROM (read-only memory), and page cache.

4,434 Questions

What is the rate of 4 GB ram 800 mhz?

what is the rate of two 2 gb ram 800 mhz?

and what is the rate of 500 gb hard disk, Intel core to duo 2.8 ghz ,Intel motherboard 856 ,and samsung 23 " lcd monitor

What is the difference between primary storage device and secondary storage device?

  • Primary Storage
  1. Two classifications of primary storage with which you should become familiar are read-only memory (ROM) and random-access memory (RAM).
  2. READ-ONLY MEMORY (ROM).-In computers, it is useful to have instructions that are used often, permanently stored inside the computer. ROM enables us to do this without loosing the programs and data when the computer is powered down. Only the computer manufacturer can provide these programs in ROM; once done, you cannot change it. Consequently, you cannot put any of your own data or programs in ROM. Many complex functions, such as translators for high-level languages, and operating systems are placed in ROM memory.
  3. Since these instructions are hardwired, they can be performed quickly and accurately. Another advantage of ROM is that your imaging facility can order programs tailored for its specific needs and have them installed permanently in ROM. Such programs are called microprograms or firmware.
  4. RANDOM-ACCESS MEMORY (RAM).-RAM is another type of memory found inside computers. It may be compared to a chalkboard on which you can scribble down notes, read them, and erase them when finished. In the computer, RAM is the working memory. Data can be read (retrieved) or written (stored) in RAM by providing the computer with an address location where the data is stored or where you want it to be stored. When the data is no longer requited, you may simply write over it. Thus you can use the storage location again for something else.
  • Secondary Storage
  1. Secondary storage, or auxiliary storage, is memory external to the main body of the computer (CPU) where programs and data can be stored for future use. When the computer is ready to use these programs, the data is read into primary storage. Secondary storage media extends the storage capabilities of the computer system. Secondary storage is required for two reasons. First, the working memory of the CPU is limited in size and cannot always hold the amount of data required. Second, data and programs in secondary programs do not disappear when the power is turned off. Secondary storage is nonvolatile memory. This information is lost only when you erase it. Magnetic disks are the most common type of secondary storage. They may be either floppy disks or hard disks (hard drives).
  • PERIPHERAL DEVICES
  1. Peripheral devices include all the input and output devices used with a computer system. When these devices are under control of the CPU, they are said to be on line. When they perform their function independently, not under direct control of the CPU, they are said to be off line. The following peripheral devices are used commonly for input and output. Those that perform only input are marked (I), those that perform only output are marked (O), and those that perform both input and output are marked (I/O).
  • Optical Character Reader (I)
  1. An optical character reader reads printed data (characters) and translates it to machine code. Keyboard (I) The keyboard is used by a computer operator to communicate with a computer system.

How do you disable second Ram Slot?

The way you disable a RAM slot on a desktop is to take the memory card in it out of the computer altogether. On a laptop, I don't know. It depends on the maker of the laptop, the model, and several other factors.

What are the Canadian inventions of the 21st century?

Research in Motion (RIM) is responsible for producing Blackberry smartphones which is very popular around the world. RIM was founded in Canada with headquarters in Waterloo, Ontario.

What does jet stand for?

a. A high-velocity fluid stream forced under pressure out of a small-diameter opening or nozzle. b. An outlet, such as a nozzle, used for emitting such a stream. c. Something emitted in or as if in a high-velocity fluid stream: "such myriad and such vivid jets of images" Henry Roth. d. A jet-propelled vehicle, especially a jet-propelled aircraft. e. A jet engine.

What dimm memory has 3 yellow slots and 1 black slot?

DDR3 SDRAM. This type of memory is the only one capable of triple-channeling, hence the three yellow slots. :)

What is a cache ram?

Same as L2 cache.

On Apple Macintosh computers, the term RAM cache refers to a disk cache.

What memory did charlie experience while he was talking to Alice?

While talking to Alice, Charlie experienced a vivid memory of a moment from his childhood, where he felt a deep sense of connection and joy. This memory resurfaced feelings of nostalgia and longing, reminding him of simpler times and the warmth of companionship. The conversation with Alice triggered these emotions, highlighting the significance of their bond and the impact of shared experiences.

Definition of RAM ROM and cache memory?

Random Access Memory (RAM) is the memory in a computer that is used to store computer programs while they are running and any information the programs need to do their job. Information in the RAM can be read and written quickly in any order. Usually, the RAM is cleared every time the computer is turned off. It is known as 'volatile memory'.

Cache memory is a more expensive memory much faster than regular memory. It is used as a buffer between main memory and the CPU so that repeated access to the same memory address will actually reference t a copy of the information if it is still stored cache memory. This speeds up the way applications work.

This is different than cache storage as when Internet Explorer uses a cache to store recently visited web page information so that a subsequent access to the web page will retrieve the data from cache instead of fetching it through the internet. This makes it much faster when you browse the Internet as it doesn't have to fetch every single file every time.

ROM is a memory which is not cleared when power is turned off. The BIOS ROM permanently stores essential system instructions (BIOS). The data held on ROM can be read but not changed. This is done during manufacturing. ROM is non volatile, meaning that the data stored on it will not be lost when the computer is switched off.

Is it Safe to remove neroxml?

neroxml is part of a Nero burning program that can get left behind after uninstalling. If you have uninstalled Nero in the past then it is perfectly safe to remove the file.

How do I read a memory address with borland c?

In order to read a memory address you must hold a reference to that address. If the object at that address is a named object, then the object's name is a reference, thus we can simply take its address using the address-of operator (unary &):

int i = 42;

printf ("Variable i resides at memory address 0x%x\n", &i);

If we wish to store the address we must use a pointer variable of the appropriate type:

int* p = %i;

Like any other variable, a pointer variable has an address of its own, thus we can read its address:

printf ("Variable p resides at memory address 0x%x\n", &p);

To read the address being pointed at we simply examine the pointer's value:

printf ("Variable p refers to memory address 0x%x\n", p);

Note this address is the same as the address of i, the object being referred to (pointed at).

To read the value stored at the address being pointed at we must dereference the pointer (unary *). Dereferencing is also known as indirection because we are indirectly accessing the object's value:

printf ("Variable p refers to the value %d\n", *p); // e.g., 42

Pointers can refer to both named and anonymous objects. Anonymous objects are simply objects allocated on the heap at runtime. Since they don't exist at compile time we cannot name them:

int* anon = malloc (sizeof (int)); // allocate memory

Note that anon is the name of the pointer, not the object being pointed at.

printf ("The anonymous variable resides at memory address 0x%x\n", anon);

free (anon); // always release heap allocations as soon as we are finished with them!

Pointers also make it possible to pass memory addresses to and from functions (also known as pass by reference):

void f (int* p) {

}

int a = 42;

f (&a); // pass the address of a to the f() function

Note that all variables in C are passed by value, but when we pass a pointer by value we are passing an address and an address is a reference. Passing references is useful when the object being referred to cannot be efficiently passed by value. Typically this means any value that is larger than the word value of the underlying architecture (e.g., 4 bytes on a 32-bit system). Arrays in particular are never passed by value, hence an array implicitly converts to a pointer.

What is a DMA controller?

In DMA as the name suggest the memory can be accessed directly by i/o module. Thus overcome the drawback of programmed i/o and interrupt driven i/o where the CPU is responsible for extracting data from the memory for output & storing data in memory for input. DMA provids different information.

i) which operation (read/write) to be performed.

ii) The address of i/o device which is to be used.

Who is Guru of Shri Ram Chandra Mission?

Babuji Maharaj is the Real Guru and the Divine Master.