The main memory or the primary memory of a computer is classified into RAM and ROM.
- RAM (Random access memory) – It communicates with the environment with the help of address selection lines, output and input lines. The electric charge is stored by dynamic RAM. Dynamic RAM is also called DRAM and it consists of a capacitor and transistor. Various designs of DRAM are SDRAM (Static DRAM), DDR DRAM (double data rate DRAM), EDO DRAM (extended data out DRAM), RDRAM (Rambus DRAM).
- ROM (Read Only Memory) – It cannot write but only read. Types of ROM are PROM (Programmable Read Only Memory), EPROM (Erasable Programmable Read Only Memory), EEPROM(Electrically Erasable PROM).
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