Memory & Memory Types : RAM vs ROM

Memory

• Computer need’s a space to for launching a program or holding a data, that kind of space is known as computer memory.
• Memory can be temporary or permanent.

Two types are:

• RAM (Random Access Memory) 
• ROM (Read Only Memory)

RAM (Random Access Memory)

• Also known as Primary memory.
• Is a volatile memory.
• It’s a Temporary storage device.
• Data will read randomly.
• Access time is same for any address.
• All the data or instructions were deleted when the power is switched off.
• Hold instructions or data.
• Enhance the performance of computer.
• Two types are
• Static  RAM (SRAM)
• Dynamic RAM (DRAM)

Dynamic RAM (DRAM):

• Small in size.
• Less cost than SRAM.
• Constantly refreshed and recharged by CPU (Processor).
• Normally used in Personal Computers.
• Two types are

SIMM (SingleInlineMemoryModule) DIMM (DoubleInlineMemoryModule)

Static RAM (SRAM):

• Costly than DRAM.
• Faster than DRAM.
• Physically larger than DRAM.

ROM (Read Only Memory)

• It is a permanent memory.
• Data can read only.
• It is a non – volatile memory.
• Holds data or instruction’s permanently.
• Data first-time recorded by the manufacturer.
• User can’t change it directly.
• All the data or instructions were not deleted when the power is switched off.
• Three types are
• PROM (Programmable Read Only Memory)
• EPROM (Erasable Programmable Read Only Memory)
•  EEPROM