1.1 system architecture.

1.1 system architecture.

1. Input/Output

   • Used in: Mice, Keyboards, Disk drives. they are used to allow an interface between a hardware device.

2. CPU

   • Is used to fetch, decode and execute.

3. Internal components

   • Main memory
     • Busses
     • I/O controllers

4. Clock speed

   • The faster the clock speed, the more instructions that can be executed.

5. Processors

   • The processors speed is measured in HERTZ (Hz)
   • Each processor has a "core" in which instructions are executed. Processors can be multi-core, Dual core, Quad core, 8 core. Each core executes instructions independently.

6. Cache

   • Saves frequently used data and helps the system run quicker.
     • Cache holds commonly used instructions

7. Embedded systems

   • A computer system that is made up of both Hardware AND Software which is often known as Firmware.
     • Used for very specialised tasks.

8. Cores

   • Quadrupling the number of cores may quadruple the number of instructions executed per second

9. External components

   • Keyboard
     • AKA peripherals
       • Mouse
   • Printer
   • I/O ports/devices

10. Secondary Storage

    • CD-R
      • Floppy disk
        • USB- Drive

11. System buses

    • Execute instructions

12. Von Neumann architecture

    • fetch execute and decode information and instructions.