Computer Operating Systems

Urban Voice -- Instructor: Lenny Bailes

Day 3 Agenda

    1. Review answers to questions in Andrews A+ book [30 min]

    2.   History of the PC · Intro to PC Hardware: components of a computer [30 min]

    See also: PC Guide: system components reference guide; MCMCSE Study Guide

    3.  Finish Lab 1: Exploring the PC [60 min]

      1. Review: Basic Control Panel Options: Date/Time, Display, System,
        Examine Device Manager, examine Printers folder
        Use DOS command-line session (keyboard practice)

      Compare DIR command with Windows Explorer listing, discuss long flenames
      Learn a few DIR parameters, also CLS, drive logon and CD
      Run DOS EDIT command and review keyboard keys
      Ctrl +Home, End, PgUp/Dn, numlock,
      capslock, DEL/INSERT, and PrtScrn, Laptops have extra FN key.

       2. New
             Enter a key code into the DOS Editor ALT +064=@ ALT 065=A
             Show ASCII tables
             DOS system font has same character set as Windows Terminal font

    Explanation for why we learn binary and hex code

    Each byte in memory (or on a disk) is the equivalent of one alphanumeric character (ABCabc1234$^&, etc.).
    A byte has eight binary bits examples: 00000001 (decimal value 1) or 00001111 (decimal value 15). The ASCII letter A is assigned a binary value of 01000001 (decimal value 65).
    There are 256 possible ways (2 to the 8th power) that you can arrange a string of eight "ones" and "zeros"
    to form a byte of information. If you go to a website with a PC character map chart, for instance,

    you'll see that each binary/decimal value between 0 and 127 has a different command or alphanumeric character associated with it. (For instance, a capital letter "A" has a value of 65 (or 01000001). The values between 128 and 255 are reserved for special language alphabet characters and drawing boxes, as you can see in the Extended Character chart.

    So knowing a little bit about the relation between decimal numbering and binary numbering can make it easier to understand how the computer turns strings of ones and zeros into executable commands and text that you see on the screen.

        3. Practice connecting and removing cables in Myers Lab 1.2

              Fill in answers to questions for Myers Lab 1.2
             See for help.

              Cable Type                                                           Connector Type

               Keyboard cable                                                    ________________

               Mouse cable                                                        ________________

               Speaker cable                                                      _________________

               Monitor data cable                                              _________________

               Printer data cable (printer end)                             _________________

               Printer data cable (case end)                                _________________

               Network data cable                                             _________________

                Modem/telephone wire                                       _________________


    History of Intel CPUs

    See MCMCSE Study Guide- Processors


    Answer questions in Labs_1 handout. (Complete additional exercises at home,
    if you have a computer that permits you to do this.)

    In the Andrews book, review the chapter 1 summary on page 35. Use the book to write out one-line vocabulary definitions for the terms from A through F on page 36. Answer questions 15-28. (Please write answers out on a separate sheet of paper, instead of just putting in a, b, c, or circling the answer in the book.)


    Write down any questions you have about chapter 1 to ask in class on Tuesday.
    Begin reading Chapter 2, pages 43-60.

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