Hardware_Software - CS 170: 01000011010100110010000000110001

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Unformatted text preview: CS 170: 01000011010100110010000000110001 001101110011000000111010 Hardware & Software Prof. Jim Appenzeller [email protected] Digits and PandA Do digits matter? • • • • 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z αβχδ ε φ γ ηΙϕκλµνοπθρστ υϖ ω ξψζ δ κ To Be or Not to Be • Simplest way to describe the physical world is with a Yes or No type of description. • Logic is based on True and False • If digits don’t matter, then PandA can be represented by anything Representing Analog Information Digitally Symbol Analog Temperature Change Digital Representation of Temperature Digits in a Computer Binary There are 10 types of people in the world, those who understand binary and those who don’t. Digits in a Computer Hexadecimal One Hex Digit A Four Binary Digits ???? Digits in a Computer One ASCII Digit Two Hex Digits Eight Binary Hex 43 Binary 01000011 S 53 01010011 20 00100000 1 31 00110001 7 37 00110111 0 ASCII ASCII C 30 00110000 : 3A 00111010 Under the Hood ALU Control Input Anatomy Memory Cycle Output •Instruction Fetch •Instruction Decode •Data Fetch •Instruction Execute •Result Return Bits, Bytes and RAM Digital Wave 1 Byte Slice of Wave 9­8 Long Term Persistent Storage Hard disks • • • • Mechanism Speed Capacity Long term persistent storage Other Storage (Archival Memory) • Magnetic Tapes • CDs ▫ Read ▫ Write (burn) • DVDs • Flash Media A Computer’s View of Software Layers of Software File System Example File Names • my_file.html (GOOD) • my_doc.docx (GOOD) • My Docment.doc (Could be a problem) • something_else.xls ...
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This note was uploaded on 10/02/2011 for the course CS 170 taught by Professor Ganu during the Fall '09 term at Rutgers.

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