COMPUTER MEMORY UNIT

MEMORY UNIT:

here i have given the memory structure which is used on the microcomputer of the fourth generation.INTERNAL
RAM
-SRAM
-DRAM
EXTERNALROM-PROM
-EPROM-PORTABLE-FLOPPY DISKETTES.-FIXED-HARD DISK-EEPROM
ROMIt is called as firm ware,informtaion stored on this memory can be read only ,it is electrically independent ,information is not destroyed even if one turns the computer off ,it is known as"non volatile memory",the newly developed ROM are ROM ,EPROM AND EEPROM.
RAMIn such types of memory ,one can read and write information ,whatever one types int he keyboard will be automatically stored in this memory ,information stored in this memory are electircally dependents ,it means if u turn the computer off ,the information will be destroyed ,it is divided into two parts as SRAM and DRAM ,it is known as the "volatile memory'".