SYSTEM UNIT
Amy PierceComm. 165
MWF 800-850
System unit components are housed within the system unit or system cabinet
• Desktop• Notebook• PDA (personal digital
assistant)
ELECTRONIC REPESENTATION• Data and
instructions are represented electronically with a two-state binary system or numbers
• A byte consists of eight bits and represents one character.
BINARY CODING SCHEMES
• ASCII• EBCDIC• Unicode
SYSTEM BOARD
• Also known as the main board or mother board
• Connects all system components
• a flat circuit board covered with sockets and other electronic parts, including a variety of chips
MICROPROCESSORThe “brains” or the system unit
• Control Unit• Arithmetic-logic
unit• Microprocessor
chips– Word
• complex instruction set computer chips
• reduced instruction set computer chips
– Smart cards
MEMORY
• RAM– flash RAM – virtual memory– memory cache
• ROM• CMOS
SYSTEM CLOCK
The system clock controls the speed of computer operations. It is measured in gigahertz.
EXPANSION SLOTS AND CARDS
• Network adapter cards• modem cards• television boards• PC cards
BUS LINES
• ISA• PCI• AGP• USB
PORTS AND CABLES
• Allow external devices to connect to the system unit
• Ports - connection sockets on the outside of the system unit– types: serial, parallel, USB, and HPSB
• Cables - used to connect external devices to the unit via ports
Thank You
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