Post on 11-Dec-2015
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Tic 2015
Informática (TIC)
Components of a Computer System
Tic 2015
Four basic parts
The computer is a machine that changes information from one form to another
Takes in information (input) and gives out information (output) All computer systems have four basic parts:
INPUT PROCESSING OUTPUT
STORAGE
COMMUNICATIONS
Tic 2015
Components of a Computer System
COMPUTER SYSTEM
HARDWARE SOFTWARE
Programs, routines and procedures that can be run
on a computer system
The physical parts of a computer system
Tic 2015
Hardware
Processor
Storage
devicesInput devices
Output
devices
Tic 2015
Storage devices
Storage devices
Primary storage
Secondary storage
Storage inside the computer, only used by the processor
ROMRead -Only Memory
• can’t be changed
• Non volatile
RAMRandom -Access Memory
Allows the computer to record information, so it can be read later.
• Can be changed
• Volatile
Tic 2015
Storage Devices
Secondary storage
Magnetic storage
Magnetic disks
Magnetic stripe
• Hard disk
• Jaz disk
• Floppy disk
• Zip disk
Magnetic tape
Tic 2015
Optical storage
• CD/DVD ROM can only be read.
• CD-R/DVD-R (recordable once)
• CD-RW/DVD-RW rewritable
• DVD-RAM writing and reading can occur at the same time (rewritable) (10 GB)
Secondary storage
Storage Devices
Blu-ray disks: largest capacity of all the optical media available (25GB)
Tic 2015
Storage Devices
Secondary storage
Solid state backing store
Memory sticks/pen drives
• very compact and portable
• very robust
• large capacity
• files are easy to lose
• Is not possible to write protect the data and files
Control the movment of electrons within a microchip.
Flash memory cards: they are used to store photos, music
• very compact, easily removed
• very robust
• expensive
• finite life in terms of the number of times they can be read from and written to