CSci 105

Introduction to Computers

Lecture 12

© Morris Firebaugh


I. Introduction


II. Data Representations: On/Off



104        103    102      101     100
---------------------------------------
10,000   1,000   100      10       1

For instance, 365 = 3 x102 + 6 x101 + 5 x100 

Base 2 place values:


24        23        22       21      20
---------------------------------------
16        8        4        2        1

For instance, 101 = 1 x22 + 0 x21 + 1 x20 


Operations with Binary Numbers


Add


Subtract


Multiply


  • Boolean Logic
  •  

    AND gate sysmbol is

    OR gate symbol is

    NOT gate symbol is


     


     


    III. Personal Computer Chips


    Microprocessors

     


  • Random Access Memory (RAM)
  •  


  • Read Only Memory (ROM)
  •  


    IV. Speed and Power

    Evolution of Computers

    Faster Clock Speeds

     


    Increase in bus size and word size

     


    Memory Management - Cache memory

     


    Reduced Instruction Set Computers - RISC


    Trends in Parallel Processing

    or

     




    Updated February 18, 2001