Page 8 - ICT_for_JHS_2_Classical

In short, the RAM is the main memory and allows you to temporarily store
commands and data. The CPU reads data and command RAM to perform
specific tasks. RAM is made up of chips, which can be expanded. RAM is like a
notebook. You can read from it and write into it

Types of RAM
Dynamic RAM (DRAM) is by far the most widely used. It stores each
bit of data using a transistor and capacitor pair.
Static RAM (SRAM): The term static refers to the fact that it
maintains its current state without having to be refreshed on a regular

basis.

Read Only Memory (ROM)

The ROM is the memory that retains its contents even after the computer is
turned off. ROM is non-volatile or permanent memory that is commonly used
to store commands such as the commands that check whether everything is
working properly. ROM is like a textbook. You can read from it but you cannot
write into it.

Read Only Memory (ROM)

NB: Memory is where information is stored and retrieved by the CPU.

Differences between Primary (RAM) and Secondary Storage
Devices (ROM)

Primary Storage Secondary

Devices Storage Devices

(e.g. RAM) (e.g. ROM)

1 They are volatile They are not volatile

2 They are expensive They are not expensive

3 They are small in capacity They have large capacity