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Lecture 13

CS100 Lecture Notes - Lecture 13: Auxiliary Memory, Control Flow, Windowing System


Department
Computer Science
Course Code
CS100
Professor
Alexandra Boutros
Lecture
13

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CPU
Arithmetic
Comparison
Logic
Data movement
Control flow
o What computer will do next
Language
o Make and model
o Number of processors
o Power consumption
o Cache
o Speed
Primary memory and secondary storage
Secondary storage
o Long term permanent storage
Hard drives
Several magnetic disks inside to store a lot of data
Flash drives
Uses static electricity
USB sticks and SD cards
o Typically contains
Operating system
Programs
Documents/data files
Settings/preferences
Primary memory
o RAM (random access memory)
o Everything that is being done on the computer is stored in the primary memory
o CPU cannot access secondary storage
Information from secondary copied to primary
Not permanent so information is lost after
When computer first turned on, primary memory initially blank
PRIMARY vs SECONDARY
o Capacity
Primary << secondary
o Speed
Primary >> secondary
o Connectivity
CPU can see primary but not secondary
o Permanency
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