Computer Basics

• Computer Operations
• Operating System - software program
• - routines for controlling inputs and outputs (keyboard, mouse, CRT)
• - routines for reading and writing disk drives
• - routines for launching program applications
• - lots more....
• Running an application
• - OS loads program into memory
• - OS starts program execution
• - Application program takes over - does whatever it is programmed to do
• Computer Components
• storage device for programs and operating system and data
• input and output devices to interact with user
• central processor to execute instructions
• Central Processor (CPU)
• local memory (cache)
• datapath
• control
• CPU operations 
• data movement
• binary operations
• Instructions, Instruction Set
• von Neumann Model
• cpu + memory
• program and data
• datapath and control
• 4-cycle procedure
• instruction fetch
• instruction decode
• instruction execute
• storage
• Computer speed