1.1 system architecture.

Input/Output
1. Used in: Mice, Keyboards, Disk drives. they are used to allow an interface between a hardware device.
CPU
1. Is used to fetch, decode and execute.
Internal components
1. Main memory
  1. Busses
  2. I/O controllers
Clock speed
1. The faster the clock speed, the more instructions that can be executed.
Processors
1. The processors speed is measured in HERTZ (Hz)
2. 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.
Cache
1. Saves frequently used data and helps the system run quicker.
  1. Cache holds commonly used instructions
Embedded systems
1. A computer system that is made up of both Hardware AND Software which is often known as Firmware.
  1. Used for very specialised tasks.
Cores
1. Quadrupling the number of cores may quadruple the number of instructions executed per second
External components
1. Keyboard
  1. AKA peripherals
    1. Mouse
2. Printer
3. I/O ports/devices
Secondary Storage
1. CD-R
  1. Floppy disk
    1. USB- Drive
System buses
1. Execute instructions
Von Neumann architecture
1. fetch execute and decode information and instructions.

Resource summary

	Created by Niamh Wyatt about 7 years ago