# Computer Operating Systems

#### Urban Voice -- Instructor: Lenny Bailes

Day 3 Agenda

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

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,

http://www.ecsu.ctstateu.edu/personal/faculty/whiter/Csc100/ASCII-code/ascii.htm

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 http://www.mcmcse.com/comptia/aplus/notes/cabling.shtml 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 http://www.mcmcse.com/comptia/aplus/notes/processor.shtml

Homework:

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.)

Optional

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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