-- Describe main memory of computer.
Computer main memory can be divided into two categories based on data storage and retrieval, namely:
1 RAM (Random Access Memory)
2 ROM (Read Only Memory)
RAM: The memory directly connected to the motherboard that can be read and written is called RAM. This memory is a temporary memory. Data is stored in RAM as long as the computer has power. RAM erases all its data as soon as the power supply is turned off. Hence it is called as temporary memory. This memory is activated as soon as the computer is turned on. After the computer is turned on, data received from the receiver is stored in this memory. It is semiconductor and direct access memory. Usually running programs and repeatedly changing information and data are stored in memory.
ROM: This part of main memory is permanent, non-volatile and non-destructive. Some programs are inserted into this memory when the computer is manufactured. Even turning off the computer does not delete any information stored in this memory. No information can be changed or expanded in it. ROM does not lose its data even if the power to the computer is turned off. Nothing new can be added, modified or changed in the ROM. Information written in this part can only be read but not written. Hence it is called Read Only Memory (ROM). The program of ROM is permanent, but now many ROMs have been invented, with the help of which the stored data can be erased and stored again. Usually ROM is used to permanently store variable data such as sine, cos, cosine etc. values for different angles or other variable data.
RAM Random Access Memory
ROM Read Only Memory.
PROM Programmable Read Only Memory.
MROM Mask Read Only Memory.
GB Giga Byte
MB Mega Byte.
CD Compact Disk
SIMM Single In -line Memory Module,
DIMM Dual In-line Memory Module.
DVD Digital Versatile Disk.
EPROM Erasable Programmable Read Only Memory.
EEPROM SDRAM Single Data Random Access Memory,
Electrically Erasable Programmable Read Only Memory.
DDR Dual Data Rate.
BIOS Basic Input Output System.
CPU Central Processing Unit.
MOSFET Metal Oxide Semiconductor Field Effect Transistor
CMOS Complementary Metal Oxide Semiconductor.
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