The Components of the System Unit
by Amporn Phatiwisan
1. Processor
1.1. control unit
1.2. arithmetic logic unit
1.3. system clock
1.4. clock speed
2. Memory
2.1. kilobytes (KB or K), megabytes (MB), gigabytes (GB), or terabytes (TB)
2.2. memory module
2.3. memory slots
2.4. Memory cache
2.5. Read‐only memory (ROM)
2.6. Flash memory
2.6.1. CMOS
2.7. Access time
2.7.1. nanoseconds
3. Ports and Connectors
3.1. A port is the point at which a peripheral attaches to or communicates with a system unit (sometimes referred to as a jack)
3.2. A connector joins a cable to a port
3.3. USB port
3.3.1. USB hub
4. Bays
4.1. bay
4.1.1. drive bay
5. Keeping Your Computer or Mobile Device Clean
6. Video: The Leopard with a Time Machine
7. The system unit
7.1. Insides
7.1.1. Drive bays
7.1.2. Power supply
7.1.3. Sound card
7.1.4. Video card
7.1.5. Processor
7.1.6. Memory
7.2. The motherboard
7.2.1. A computer chip
8. Data Representation
8.1. binary system
8.1.1. Bits and bytes
8.2. ASCII (American Standard Code for Information Interchange)
9. Expansion Slots and Adapter Cards
9.1. expansion slot
9.2. adapter card
9.2.1. Sound card and video card
9.3. Plug and Play
9.4. Memory cards, USB flash drives, and PC Cards/ExpressCard modules
10. Buses
10.1. bus
10.1.1. Data bus
10.1.2. Address bus