SYSTEM UNIT

1. Memory

1.1. Volatile memory

1.1.1. Loses its content when power is off.

1.1.1.1. Exp: RAM

1.1.1.1.1. Dynamic RAM (DRAM)

1.1.1.1.2. Static RAM (SRAM)

1.1.1.1.3. Magnetoresistive RAM (MRAM)

1.2. Non-Volatile

1.2.1. Not lose content even power is off

1.2.2. Ex: Include ROM, flash memory

1.2.2.1. ROM refers to storing permanent data and instructions.

1.2.2.2. A PROM chip is a blank ROM that can be written to permanently.

1.2.2.3. Access time is the amount of time it takes the processor to read from memory.

2. Processor

2.1. Multi-core processor

2.2. Dual-core processor

2.3. Quad-core processor

3. Motherboard

3.1. A computer chip contains integrated circuits

4. Ports and Connectors

4.1. A port is the point at which a peripheral attaches to or communicates with a system unit

4.2. A connector joins a cable to a port

5. Expansion slot and Adapter cards

5.1. An expansion slot is a socket on the motherboard that can hold an adapter card

5.2. Plug and play, the computer automatically can configure adapter cards and other peripherals as you install them.

5.3. Removable flash memory

6. Power supply

6.1. The power supply converts the wall outlet AC power into DC power

6.2. Some external peripheral have an AC adapter, which is an external power supply.

7. Buses

7.1. A bus allows the various devices both inside and attached to the unit to communicate with each other

7.1.1. Data bus

7.1.2. Address bus

7.2. Word size is the number of bits the processor can interpret and execute at a given time.