RAM & ROM

      RAM (Random Access Memory)

            RAM Stands for Random Access Memory RAM is also called main memory or primary storage; it consists of memory chips that can be read from and written to by the processes and other devices. RAM varies in size like 64MB, 128MB, 256MB, and 512MB to 2GB.

 RAM

ROM (Read Only Memory)

            ROM stands for Read Only Memory. It consists of those instructions that prepare the computer for use ROM instructions are automatically loaded into the main memory. These instructions cab only be read but cannot be changed or delete.

ROM

Main Memory Purpose

            RAM is main Memory purpose or primary storage RAM cannot save data permanent. RAM can be read from and written to by the processer and other devices.

Types of RAM

(i)                 SIMM

(ii)               DIMM

(iii)             RIMM

SIMM

            This type of RAM power protection system is called the oldest type. It was used only in Pentium 1. It has two furthers types

(i)                 30 pins

(ii)               72 pins

We can install this type RAM at 45 into the system

DIMM

            This type of RAM is the most useable and popularly the RAM. It has two major types

(i)                 SDRAM

(ii)               DDRRAM

RIMM

      This RAM is used in P3 and P4 system. It has 2 cuts in the middle of it. It has “184” pins in middle.

SDRAM

      This type of RAM can be install P1 to P4. It has 2 cuts and 168 pins.

DDRRAM

     

     DDRRAM Stands for Double Data Rate Random Access Memory. This type of RAM is the most advanced RAM. It is used in only P4 system it has only 1 cut and 484 pins.

DDR2

      This type of RAM has 192 pins and single cut.

Types of ROM

(i)                 Mask ROM

(ii)               PROM

(iii)             EPROM

(iv)             EEPROM

(v)               Flash ROM

Mask ROM

                        Mask ROM is on motherboard die we can reprogram be software

      PROM

            PROM is stands for Programmable Read Only Memory.

    EPROM

            Erasable Programmable Read Only Memory

   EEPROM

            EEPROM Stands for Electrically Erasable Programmable Read Only Memory.