Operative memory

Volume of accessible operative memory - one of the major parameters of any computer. Operative memory or an operative memory (the RAM or RAM) represents set of microcircuits on the system payment, capable to accumulate and temporarily to store(keep) programs and the processable data. This information may is as required fast be read out from operative memory by the processor and enter the name there again. At switching-off of a feed(meal) contents of operative memory are completely erased and lost. Therefore after inclusion of the computer of the program and every time anew is necessary for loading the data into operative memory from sources of long-term storage of the information. Magnetic and optical disks or other stores of the digital information more often are applied to long-term storage of the information.

In modern computers dynamic operative memory or DRAM (Dynamic Random Access Memory) is applied mainly. She(it) is under construction on the microcircuits demanding in order to prevent losses periodic updating of the information. This process has received the name " regeneration of memory ". It(he) is realized by the special controller established on a parent payment. Some time is spent for periodic regeneration of the data in microcircuits of dynamic operative memory. Attempt to read from memory up to the moment of end of a cycle of regeneration results the information in occurrence of mistakes. Therefore failures in memory quite often appear one of the widespread problems in work of inexpensive personal computers of "yellow" or "black" assembly even if in them completely serviceable microcircuits of dynamic operative memory are used.

Volume of any computer memory including operative memory, it is measured in kilobytes and mbytes. The least unit of measurements of information capacity and least unit of division of memory of the computer is byte. Actually the byte is, in turn, set of eight smallest units of the information which name bats. A difference between the elementary stationary binary conditions, for example, "is included" / "is switched off" or between zero and one makes only one of bats. Byte (or eight - bit) the structure of measurement is chosen from - for the binary organizations of computer facilities. Transfer or preservation of one any symbol - letters, figures or a mark - needs a minimum of one byte.

Дата добавления: 2015-07-21