Differentiate between RAM and ROM

RAM- RAM has storage cells meant for read and write operations. As these cells can be accessed directly, these are called random access memory. RAM temporarily stores data while the CPU is working on it. Since it is a volatile memory, the data is lost on loss of power supply. RAM is of two types: dynamic (DRAM) and static (SRAM). SRAM keeps the data as long as the power is on. It also gives a fast access to data. SRAM is primarily used for registers (small amounts of memory) in CPU and fast cache memory. DRAM is smaller and much slower than SRAM. It also stores data for a very short time. Therefore, data stored In DRAM needs to be refreshed periodically even when the power is on. Because of its smaller size, DRAM is generally used for the main memory of the computer. ROM- ROM is a non-volatile memory. Data is not lost on lossing power supply. however once data is written on a rom, we cannot write on it. rom store programs that are important for a computer operations such as the bootstrap program which start a computer by loading and operating system and the basic input output system which addresses external devices in a personal computer. There are three different types of ROMs. PROM- programmable ROM. The information recorded on this cannot be erased. EPROM- erasable programmable ROM. Exposure to UV light can erase the information recorded on eprom. EEPROM- electrically erasable programmable ROM. Electrical signals can erase the information recorded on EEPROM.