The memory is responsible for storing the data and instructions is part fundamental of computer. Memory Main stores instructions and data from those programs that are running, in order to have the computer is running programs, the information is accessed to these, along with the programs must be in memory main during the process of implementation.

There are reports supporting or secondary which has the function of peripheral system, when the main memory can not store all the instructions and information is then used as auxiliary memory information is transferred, as needed, to main memory.

The basic operation is that of reading in which it receives a address the position where the information that has been previously deposited, the other operation is the writing that is receiving the guidance and information to be recorded. Memory is access Random is called also main memory is one where the computer save the data you are using at the time This. The processor accesses the bytes of memory without having to go through the previous bytes as called for random access.
It is the most common memory PC and the difference between this type of memory and other plus is the speed that information is lost when you shut down your computer compared for example from hard drives that the information remains.

DRAM RAM is a dynamic each bit is built by a single transistor and a capacitor, a problem forget is that the data it receives almost as fast as it provided, so you must be constantly refreshed hundreds of times per second so the charges stick.
SIMM A set of DRAM chips mounted on a plate printed circuit board or PCB which is placed in a receptacle on the board SIMM system

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