About memory organisation.

You Should know about this main concept of computer.

In this I am going to tell you about memories of computer.

     Memory of a microcomputer is a space where program &data are stored  before the execution.  Thememories are divided into two groups first one is primary memory and another is secondary memory.

  Primary memory:  The primary memories are semiconductor RAM and ROM etc. These memories are faster, economical, smaller in size and lighter.. It's speed is very fast as compared to secondary memory.It is directly accessed by CPU.

Secondary memories:The secondary memories are also called as magnetic memories. It is used for bulk of data and information. These are floppy disk ,hard disk etc. It's speed is less as compared to primary memory. These are sequential in nature. It's cost  of storage per bit is less than the less than the primary memories.

          The following are the  memory organisation.

 RAM(RANDOM ACCESS MEMORY):

                                             The RAM is a type of computer memory that can be accessed randomly; that is ,any byte of memory can be accessed without touching the preceding bytes .The RAM is the most common type of memory found in the computer and any otherdevice , such as printer.

ROM (READ ONLY MEMORY): It is a non volatile memory , it retains stored information even  if the power is turned off. It is  used to store the program and data that needs not to  be altered.

 The ROM is of many types.

1) PROM

2) EPROM

3) EEPROM.