THE COMPUTER SCIENCE TIMES

ITGS??

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SYSTEM FUNDAMENTALS

System Fundamentals
UTILITY SOFTWARE
-VIRUS CHECKERS
-FILE MANAGEMENT
SOFTWARE (UNTOCHABLE)
- OPERATION SYSTEM
THE HEART OF THE COMPUTER
CPU IS THE BRAIN
PLUG AND PLAY (RECOGNIZE THE HARDWARE)
OUTPUT (APPLICATION SEND THE MESSAGE TO THE HARDWARE TO PRINT I.E.)
MONITOR COMPUTER PERFORMANCE
KEEP TRACK OF FILES AND DIRECTORIES
MANAGE APPLICATIONS
+ OS IS THE TRANSIT POLICE MAN, BECAUSE IT GAVE THE SEVERAL PERMISSION AND CONTROLS OF APPS AND DEVICES
IT IS IN CHARGE THAT ALL PROGRAMS AND DEVICES RUNNING AT THE SAME TIME DO NOT INTERFERE WITH EACH OTHER
+ MANAGE HW & SW RESOURCES
+ IT ALLOWS COMMUNICATION WITH FINAL USER
HARDWARE—-><———OS———><————APPLICATION———>USER
A CIRCUS (MANY OPERATION INSIDE)
DIRECTOR DE ORQUESTA
SINGLE-USER
MULTI-USER
SINGLE-TASK
MULTI-TASK
FUNCTIONS:
PHERIPHAL COMMUNICATION: COMMUNICATION INTO HW
HW DEALS WITH BINARY MACHINE CODE (ELECTRIC IMPULSES).
DEVICES DRIVERS: SW DESIGNED TO WORK DIRECTLY WITH HW
OPERATING SYSTEM DEAL WITH DEVICES DRIVERS AND APPLICATION
COORDINATING CONCURRENT PROCESS:
IT HANDLES THE LOADING AND UNLOADING OF PROCESSES TO AND FROM THE PRIMARY MEMORY (RAM,ROM,ETC revisar)
MEMORY MANAGEMENT: CONTROLS THAT EACH PROCESS OPERATES IN ITS OWN MEMORY SPACE. ENSURES THEY DON´T COLAPSE BETWEEN THEM (no interfieran entre ellos).
RESOURCES MONITORING: TASK MANAGER. CONTROLS HOW MUCH PROCESSOR TIME THEY CAN HAVE. HOW MUCH MEMORY THEY NEED. KEEPS ALL PROCESSES RUNNING.
ACCOUNTING AND SECURITY:CONTROLS THE ACCESS IN MULTI-USER AND NETWORK ENVIRONMENT. CREATES LOGS FOR EVERY ACTIVITY
- USING AND INTERPRETING THEM YOU CAN DISCOVER THE ENTRANCE OF UNATHORIZED USERS.
PROGRAM AND DATA MANAGEMENT: KEEPS TRACK OF FILES AND PORTS. CONTROLS THE DATA RESOURCES MANAGEMENT FOR THE READ AND WRITE FUNCTION
CLASSIFICATION
- PERSONAL COMPUTERS
-PORTABLE COMPUTERS
- MAINFRAMES
- SUPERCOMPUTER
- GAME CONSOLES?
NUMBER OF USER
AMOUNT OF TASKS
- APPLICATION
 
HARDWARE (TOUCH)
There are connected to work with OS

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Virus Checkers

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Data Compression

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3 CHARACTERISTICS

DATA COMPRESSION.-

  • .ZIP
  • Bit-rate reduction
  • Increase the capacity of memory and segments in the hardware

FILE MANAGER.-

  • Manage and handle files
  • Allow the navigation through the file
  • Allow user see a preview at the right side of the windows (Windows)

DEFRAGMENTATION.-

  • Reorganize
  • Move and join files data together
  • Avoid fragmentation

VIRUS CHECKERS.-

  • Cleans cookies
  • Analysis (files and networks)
  • Free download, or license for their use of it might cost.

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Defragmentation