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Computer Systems I’m ONLY a machine!.

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Presentation on theme: "Computer Systems I’m ONLY a machine!."— Presentation transcript:

1 Computer Systems I’m ONLY a machine!

2 Hardware Hardware refers to all the parts of the Computer System that we can touch. An item of hardware is called a device. Microprocessor Main memory Input / Output Backing Storage

3 Central Processing Unit
CPU Input Output RAM ROM Backing Storage

4 The Processor Carries out the actual process
Follows a set of instructions called a program Like a brain but can’t think or act for itself INPUT PROCESS OUTPUT

5 Representing Graphics & Text
Bit-Mapped Graphics Dots called pixels Each pixels is either On (1 – black) or Off (0 – white) Text – ASCII standard file format = MUJTABA BE QUIET

6 Units of Storage Binary Unit Value Bit 1 or 0 Byte 8 bits
Kilobyte (KB) 1024 bytes Megabyte (MB) 1024 Kilobytes Gigabyte (GB) 1024 Megabytes Terabyte (TB) 1024 Gigabytes

7 Main Memory CPU Input Output RAM ROM Backing Storage

8 Main Memory Where the computer stores programs & data Types: RAM ROM
Random Access Memory ROM Read Only Memory

9 Main Memory ROM Chip Permanent storage
Data is safe when computer is switched off Data can not be added to ROM Some OS are stored on ROM Chips RAM Chip Temporary storage Data is lost when computer switched off Data can be written to RAM Upgrading is easy with RAM Chips

10 Input CPU RAM Backing Storage Input Output ROM

11 Input Devices (Navigational)
Mouse Trackball Track pad Touch Screen Joystick SmartBoard

12 Input Devices (Data Input)
Keyboard Graphics Tablet Scanner Digital Still camera Digital Video Camera Webcam Microphone

13 Backing Storage CPU RAM Backing Storage Input Output ROM

14 Backing Storage Method used to physically store data.
Constantly increasing in capacity to meet demands. Magnetic Storage Floppy disc, Hard Disc, Magnetic Tape Optical Storage CD, DVD Solid State USB Flash Drive

15 Drive or Media Drive Media

16 Magnetic Storage Hard Disk Drive Floppy Disk Magnetic Tape
Usually main type of backing store Non-removable media Floppy Disk Plastic disk with rectangular cover Removable media Magnetic Tape Sequential Access Think VHS tape Easy to damage – put next to magnet it will be wiped

17 Optical Storage

18 Optical Storage CD-ROM DVD-ROM CD-Recordable (CD-R) / DVD-R
Read by a laser beam that reflects of surface “pits” and “lands” DVD-ROM Similar to CD but with larger capacity because of multiple layers CD-Recordable (CD-R) / DVD-R Write Once, Read Many CD-Rewritable (CD-RW) / DVD-RW Still uses a laser but contents can be changed Advantages – high storage capacities Disadvantages – Harder than mag but still easy to damage

19 USB Flash Drive Universal Serial Bus: Solid State Memory Advantages
Computer interface used by different devices. Solid State Memory No moving parts Advantages Portable Can have large memory (currently 8GB) Goes through the wash

20 Flash Memory Cards Solid State Memory Advantages No moving parts
Used in cameras and mobile phones Advantages Portable Can have large memory (currently 8GB) Can be read by a card reader Goes through the wash

21 Output CPU RAM Backing Storage Input Output ROM

22 Comparison of Printers
Output Devices Printer Laser Inkjet Comparison of Printers Resolution Dots Per Inch (DPI) Speed Pages Per Minute (PPM) Cost Capital Cost Running Costs

23 Output Devices Plotter Monitor (VDU) LCD TFT Multimedia Projector
Liquid Crystal Display TFT Thin Film Transistor Multimedia Projector Speakers

24 Types of Computer Desktop Laptop/Notebook Palmtop
Think about the different I/O

25 Types of Computer Mainframe Think about the different I/O

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