the computer and its components

1
1
Introduction
Whats a reckoner?
􀂄 An electronic device:
Gets Input
Processes the Input
Output
􀂄 ensample:
You type an MS_Word document (Input)
You click on the Print push (Process)
The document is printed. (Output)
􀂄 Why Use a reckoner?
Time
Accuracy
Reliability
2
Computer Structure
􀂄 NB: The different components will be treated in
bulky detail in next chapters.
Computer
Application software system of rules software
Input Devices
The System Unit
Output Devices
Secondary Storage
MS_Word
MS_Excel
Pascal ……..
run System
(DOS, UNIX..)
BIOS ….
Hardware Software
2
3
The Relationship among the User
and Computer Components
􀂄 4 3
􀂄
􀂄 2 1
􀂄 manikin:
To manage the Secondary Storage (e.g The
Floppy discus), you ordinarily use Windows
Explorer: An application software
􀀨 Relation_1
Hardware Application
Software
System
Software
User
4
The Relationship among the User
& Computer Components (Cont.)
􀂄 W_Explorer will communicate with the
appropriate System Software (MS_DOS)
􀀨 Relation_3
􀂄 In its turn, The System Software
(MS_DOS) communicates with the
Hardware and carry out the user requests.




􀀨 Relation_4
Relations(3 & 4) go behind the scenes
The user does not notice any thing.
3
5
MS_DOS
MicroSoft Disk Operating System
􀂄 Actually, you can communicate directly
with the system software (e.g MS_DOS),
This fundamental interaction is a Relation_2 one.
􀂄 => MS_DOS commands
􀂄 Commands that instruct the computer to
perform certain trading operations (e.g: Creating
new directories, copying files …)
6
The MS_DOS Tree Structure of
Directories
Drives
Directories
/ Folders Files
4
7
MS_DOS
Some Tips
􀂄 legitimate Drive
􀂄 Root
􀂄 MD / Edit
􀂄 CD
􀂄 Dir
􀂄 Copy / Move
􀂄 RD / Delete
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