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Computer Storage. Warning – Science Content!. An Analogue Device. Fully on (1). Dimmer Switch. Partly on. Fully off (0). A Digital Device. Fully on (1). Light Switch. Can’t hold any intermediate value. Fully off (0). The Binary Digit (Bit). Value = 0. Value = 1. 2 Bits = 4 Values. - PowerPoint PPT Presentation
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Introduction to Computers – Part 2 1
Computer Storage
Warning – Science Content!
Introduction to Computers – Part 2 2
An Analogue Device
Fully off (0)
Fully on (1)
Dimmer SwitchPartly on
Introduction to Computers – Part 2 3
A Digital Device
Fully off (0)
Fully on (1)
Light SwitchCan’t hold any intermediate value
Introduction to Computers – Part 2 4
The Binary Digit (Bit)
Value = 0 Value = 1
Introduction to Computers – Part 2 5
2 Bits = 4 Values
Switch 1 Switch 2 Value
OFF OFF 00 (0)
OFF ON 01 (1)
ON OFF 10 (2)
ON ON 11 (3)
Introduction to Computers – Part 2 6
8 Bits = 1 Byte = 256 Values
Introduction to Computers – Part 2 7
Bits and BytesBitByteKilobyte (KB)Megabyte (MB)Gigabyte (GB)Terabyte (TB)Petabyte (PB)Exabyte (EB)Zettabyte (ZB)1 Yottabyte (YB)
Introduction to Computers – Part 2 8
Computer Parts – The System Unit
Introduction to Computers – Part 2 9
Monitor/Screen
Introduction to Computers – Part 2 10
Keyboard
Introduction to Computers – Part 2 11
Mouse
Original mouse
Introduction to Computers – Part 2 12
Printer
Introduction to Computers – Part 2 13
Modem
Introduction to Computers – Part 2 14
Other Peripherals
Introduction to Computers – Part 2 15
Inside the Case
Introduction to Computers – Part 2 16
Motherboard
Introduction to Computers – Part 2 17
(Micro)Processor
Introduction to Computers – Part 2 18
Memory (RAM)
Introduction to Computers – Part 2 19
Great Moments in History - 2
"640KB [of memory] ought to be enough for anybody"
Bill Gates, CEO of Microsoft, 1981
Introduction to Computers – Part 2 20
Hard Disk Storage (HDD)
Introduction to Computers – Part 2 21
Floppy Disk Drive
Introduction to Computers – Part 2 22
Optical Drive (CD/DVD)
Introduction to Computers – Part 2 23
USB Storage Devices
Introduction to Computers – Part 2 24
Processor speeds
• Computer speed is measured in billions of cycles per second or ‘GigaHertz’. (more is better).
• Modern computers can execute at about 3GHz
• That’s about 3,000,000,000 instructions every second!
Introduction to Computers – Part 2 25
Storage v MemoryStorage (HDD): Electromagnetic
Slow to access
Stores permanently - Contents remain when power is turned off
Memory (RAM):Electronic (semiconductor)Very fast access
Stores temporarily - Contents disappear when power is turned off!
Introduction to Computers – Part 2 26
The Operating System
Introduction to Computers – Part 2 27
The User Interface
Introduction to Computers – Part 2 28
Command Line User Interface (CLI)
xxcopysu "f:\Data" "G:\Data" /a /h /e /r /q /y /zy /ze /pb /yy /v /OF /OD3 /oa"F:\Data\Batch Files\XXCopy\backup.log"
Introduction to Computers – Part 2 29
Graphical User Interface (GUI)WINDOWS
Keep programs in separate boxes on the screen
ICONS represent programs or data
as picturesMENUS
present lists of available options
A POINTER Is used to select any object
on the screen
Introduction to Computers – Part 2 30
Microsoft Windows