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Computing Components 01/26/11
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Announcements & Reminders Programs 1 due Friday, 9/2/11 What is my late policy? Proxy Codes for Labs You should be able to get in now, if you have an ID with a gold bar
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Change Your Password The command is: passwd In the lab first do : ssh -Y onyx You will have to see me to change it, if you forget it. Change it to something you can remember.
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Computing Machines
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Today Parts of a Computer Instruction Cycle More linux
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Parts of Computer
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CPU Central Processing Unit “Brain” of computer Has Control Unit Decodes instructions Sends signals to rest of System ALU, Arithmetic and Logic Unit Add, Subtract, Compare Registers High speed memory locations inside CPU
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Memory Integrated circuit chips Used to store data and instructions
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Memory Stored as ones and zeroes 0011 0100 Bit – binary digit Byte – eight bits, a character Word – 16, 32, 64 bits.
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Memory Address Binary number that tells where something is stored. Contents Data contained at that address.
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Secondary Storage What happens to data in memory when you turn off the machine? What are examples of long term storage devices Thumb drive Hard Drive Tapes
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Input/Output Input Allows information to be sent to the computer Keyboard, Scanner, Mouse, Microphone Output Allows user to receive information from the computer. Monitor, Printer, Speaker
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Relationship of Parts Sketch of System Instruction Cycle
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How does CPU know what to do? Software – programs. Operating System Controls interaction of hardware. e.g. print, copy Application Software Solve real world problem e.g. add interest to a bank account
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Languages Machine code Binary code 1110 0101 Specific to CPU Assembly Language Mnemonic code High Level Language Machine independent C/C++, Java, FORTRAN
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Compiler Translates H.L. to M.L. Source File --> Object File C++ Text File --> Binary
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Other Software Linker Resolves cross references, e.g. Creates executable file Loader Copies executable file to memory Starts execution
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Quiz Monday, 1/31/11 On your own p. 24 #1-8, 13, 14, 16 Odd answers in text Define Memory address Memory contents Machine language
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Reading Read Chapter 2
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More Linux Will cover more as semester progresses
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