RAM is a type of computer storage whose contents can be accessed in a fixed time does not care where the data in memory. This contrasts with the serial memory devices, such as magnetic tapes , disks and drums, in which the mechanical movement of the storage media to force the computer to access data berurutan.Pertama times in 60'an known.
Only when the semiconductor memory that has not been popular because the price is very expensive. It was more usual to use the main memory such as Intel magnetic.Perusahaan semiconductor producing debut with RAM, more precisely DRAM.Biasanya types of RAM can be written and read, as opposed to memory- read-only (read-only-memory, ROM), RAM is usually used for primary storage (main memory) for use in computers and change the information actively, although some tools use some kind of RAM to provide a secondary storage -term there panjang.tetapi also argue that the ROM is another type of RAM, because it is actually also Random Access as SRAM or DRAM. It's just that indeed the process of writing the ROM does not require a specific process as easy and flexible as well as in the SRAM or DRAM.
In addition, some sections space addresses of RAM (main memory) of a system that is mapped into one or two chip ROM