Topic 2 Hardware Revision

Topic 2 Hardware Revision

1. Input Device

2. Output Device

3. Assistive Technology

4. Secondary Storage

   • types of secondary Devices include
     • Megnetic Hard Drive
       • The hard disk is the main storage device in your computer. The hard disk contains lots of metal platters which have been coated with a special magnetic material which the data will be stored in, in order to access the data the platters must spin over a thousand times a second.
     • Optical Disk
       • A CD can hold around 650mb of data, Compact disk can come in two main formats CD-ROM and CD-RW. CD-ROM means the CD is read only disk, Also the data on the disk can only be written once. CD-RW means the disk is rewriteable and you can save the data on the disk over and over again, But they are more expensive than the CD-ROM and flash.
     • Magnetic Tape
       • Magnetic tape can hold up to one terabyte of uncompressed data, Magnetic tape uses serial access to find a piece of data which means to find a pacific piece of data it has to start at the beginning of the tape which can take a long time.
     • Solid State Memory (Flash Memory)

5. The CPU

   • The CPU is the core of every computer system and has tree main component - The Control Unit, The arithmetic and logic unit, The immediate access store or registers.
     • Arithmetic Part
       • This performs the calculations on the data.
     • Logic Part
       • This deals with logic and comparisons
     • Control Unit
       • Controls data moving through the processor
     • Processor
       • Directs the system to carry out program instuctions. It also does the fetching, decoding and managing of instructions

6. Binary Logic

7. Memory