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