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COMPUTER MEMORY

Computer memory is used to describe an electronic circuit that is responsible for storing data and applications temporarily or permanently. Computer memory can be classified into two types: primary memory and secondary memory. Primary memory is used for direct access of data by the processor. Main memory can be divided into 2 types namely RAM (Random Access Memory) and ROM (Read Only Memory). RAM retains its contents as long as electricity is on. Computer RAM is responsible for storing temporary data, so that it can be directly accessed by the processor part and if needed. Which means that the data will be deleted after the inventory on the storage device is turned off.
Types of RAM: SRAM (Static RAM) and DRAM (Dynamic RAM). Static RAM (Expensive and Fast) SRAM is a bistable circuit that attaches to storing one bit each. High prices prevent not many from using this machine for everyday use, but many modern machines use SRAM as a processor cache. Dynamic RAM: Widely used in modern computers as main memory, DRAM is slower than SRAM, but not expensive because it's easy to install memory storage.
RAM Computer (source: buzzle.com)


ROM (Read Only Memory). ROM are devices that are in the CPU. ROM is a form of permanent storage. ROM remains active regardless of whether the power supply is turned on or off. However, ROM is used (in cases that are rarely used) as the main device for most computers in the '80s. This is because the ROM device does not allow the data stored on it to be modified. As indicated by its name, the data can only be accessed and read by the user, not overwritten, upgraded or modified. System programs stored on ROM devices cannot be changed and are therefore safe to use. The types of ROMs include the PROM (Programmable Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory) and EEPROM (Electrically Erasable Programmable Read-Only Memory).
ROM Computer (source: techfuels.com)


The secondary memory cannot be directly accessed by the CPU, to access the data contained therein, then the data in the secondary memory is moved to the primary memory, then read and executed by the processor. Secondary Memory is a place where data is dwelling. Examples of secondary memory are Hardisk, pendrive, CDR and DVD are examples of secondary memory. Secondary memory speeds are slower than primary memory, as they are not oriented towards completion of task process.

REFERENSI
Differences, Tech. 2017. Difference Between Primary and Secondary Memory. Retrieved from
Hemmendinger, David. 2016. Computer Memory. Retrieved from https://www.britannica.com/technology/computer-memory

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