The Components of the system unit
by Peerasuk Hachaikul
1. Processor
1.1. Multi‐core processor
1.1.1. control unit
1.2. Dual‐core processor
1.2.1. arithmetic logic unit
1.3. Quad‐core processor
1.3.1. system clock
2. Memory
2.1. The operating system and other system software
2.1.1. Volatile memory
2.1.1.1. Loses its contents when power is turned off
2.1.1.2. Example includes RAM
2.2. Application programs
2.3. Data being processed and the resulting information
2.3.1. Nonvolatile memory
2.3.1.1. Does not lose contents when power is removed
2.3.1.2. New node
3. Expansion Slots and Adapter Cards
3.1. An expansion slot is a socket on the motherboard that can hold an adapter card
3.2. An adapter card enhances functions of a component of the system unit and/or provides connections to peripherals
3.2.1. ound card and video card
4. The system unit
4.1. Drive bay(s)
4.2. Power supply
4.2.1. The power supply converts the wall outlet AC power into DC power
4.2.2. Some external peripherals have an AC adapter, which is an external power supply
4.3. Sound card
4.4. Video card
4.5. Memory
4.6. Processor
5. Data Representation
5.1. Analog
5.1.1. signals are continuous and vary in strength and quality
5.2. Digital
5.2.1. signals are in one of two states: on or off