TYPES OF RAM AND ROM

2. What is RAM? And what are it’s
kinds?
 The Random access memory, called "RAM" in
short, is also known as the primary memory of
the computer.
 RAM is considered as random access because of
the fact that it can access any memory cell
directly with the knowledge of the point of
intersection of the row and column at that cell.
• TWO MAIN TYPES OF RAM:
 DRAM
 SRAM

3. What is dynamic memory?
Dynamic Random Access Memory is a
type of memory that is typically used
for data or program code that a
computer processor needs to function.
It is also known as DRAM which is a
common type of RAM used in Personal
computers, workstations and servers.

4. How does DRAM store the data?
 DRAM stores each bit of data or program
code in a storage cell.
 A DRAM storage
cell is dynamic that it
needs to be refreshed
to compensate for charge
leaks from the capacitor.
Capacitor
transistor
Storage cell
(where
DRAM
stores data)

6. WHAT IS ROM?
Read-only memory (or
simply ROM) is a type
of computer memory.
It’s a permanent/non-
volatile memory.
Usually, the USER cannot
write to the ROM.
ROM is used for the Basic
Input /Output
System(BIOS).

7. TYPES OF ROM
There are four basic ROM types:-
PROM - Programmable Read Only Memory.
EPROM - Erasable Programmable Read Only
Memory.
EEPROM - Electrically Erasable Programmable
Read Only Memory.
Flash Memory.

8. Like ROM ,the PROM is a non-volatile memory.
The contents cannot be modified once it’s programmed.
For the PROM ,the writing process is performed electrically.

9. Erasable Programmable Read Only
Memory- (EPROM)
It’s UV erasable programmable read only memory.
The contents can be erased by exposing the EPROM into
Ultraviolet(UV) Lights.
EPROM is more expensive than PROM.

10. It’s type of non-volatile memory
used in computers and other
electronic devices.
Can be electrically programmed
& electrically erased by user.
Write operation takes longer time
than Read operation.
More expensive than EPROM.

11. The newest form of semiconductor
memory is Flash Memory.
Like EEPROM, flash memory uses
an Electrical Erasing Technology.
It is possible to erase just blocks of
memory rather than an entire chip.
Flash memory is widely used with
cell phones, digital cameras, printers
etc.