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| 1. |
nswerIWrite a short note on Computer Memory.Primary Mem |
| Answer» <p>Computermemoryis any physical device capable of storing information temporarily or permanently. For example, Random Access Memory (RAM), is a volatile memory that stores information on anintegrated circuitused by theoperating system,software, andhardware.Types of computer memory (RAM and ROM)</p><p>Memory is the best essential element of a computer because computer can’t perform simple tasks. Computer memory is of two basic type – Primary memory / Volatile memory and Secondary memory / non-volatile memory. Random Access Memory (RAM) is volatile memory and Read Only Memory (ROM) is non-volatile memory.</p><p>1. Random Access Memory (RAM) –</p><p>It is also called asread write memoryor themain memoryor theprimary memory.</p><p>The programs and data that the CPU requires during execution of a program are stored in this memory.</p><p>It is a volatile memory as the data loses when the power is turned off.</p><p>RAM is further classified into two types-SRAM (Static Random Access Memory)andDRAM (Dynamic Random Access Memory).2. Read Only Memory (ROM) –</p><p>Stores crucial information essential to operate the system, like the program essential to boot the computer.</p><p>It is not volatile.</p><p>Always retains its data.</p><p>Used in embedded systems or where the programming needs no change.</p><p>Used in calculators and peripheral devices.</p><p>ROM is further classified into 4 types-ROM,PROM,EPROM, andEEPROM.</p><p>Types of Read Only Memory (ROM) –</p><p>PROM (Programmable read-only memory)– It can be programmed by user. Once programmed, the data and instructions in it cannot be changed.</p><p>EPROM (Erasable Programmable read only memory)– It can be reprogrammed. To erase data from it, expose it to ultra violet light. To reprogram it, erase all the previous data.</p><p>EEPROM (Electrically erasable programmable read only memory)– The data can be erased by applying electric field, no need of ultra violet light. We can erase only portions of the chip.</p> | |