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Logical Computer System. Unit 2, Introduction to Computer Systems. Logical vs. Physical. A computer system can be represented in either a logical or physical form Both are useful in understanding Computer Systems theory. Physical Computer System.

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logical computer system

Logical Computer System

Unit 2, Introduction to Computer Systems

logical vs physical
Logical vs. Physical
  • A computer system can be represented in either a logical or physical form
  • Both are useful in understanding Computer Systems theory.

Logical Computer System Presentation Unit 2

physical computer system
Physical Computer System
  • The actual hardware as seen in real life
  • Contains micro-electronics and physical mechanisms
  • Powered by electricity
  • Very detailed and complex
  • Difficult to fully understand without a working knowledge of electronics.

Logical Computer System Presentation Unit 2

logical computer system4
Logical Computer System
  • A basic model of a computer system
  • The model is built from a number of different blocks
  • Each block performs a different task
  • All blocks work together to process data into information
  • Model is conceptual – could not be physically the same in real-life
  • Less complex, easier to understand.

Logical Computer System Presentation Unit 2

logical computer system5
Logical Computer System

CPU

Control Unit

ALU

Input

Device

Main

Memory

Output

Device

Backing

Storage

Test me!

Logical Computer System Presentation Unit 2

input device
Input Device
  • A device which lets the user “feed” data into the computer
  • Converts data into a stream of electronic digital signals
  • Digital signals will be converted into binary inside the computer
  • Some sample real-world input devices; keyboard, mouse, light pen, scanner, microphone, camera, motion sensors, biometric devices such as a fingerprint scanner, OMR/OCR readers for direct data capture etc.

Logical Computer System Presentation Unit 2

main memory
Main Memory
  • Stores data before being processed by CPU
  • Stores program being executed by computer
  • Is volatile - when power is removed, data is lost
  • Often called “RAM” - Random Access Memory
  • Stores processed data before it is output
  • Contents are filled by Input Devices, Backing Storage or the CPU
  • Data that needs to be saved (for future use) is written to the backing storage.

Logical Computer System Presentation Unit 2

backing storage
Backing Storage
  • Usually non-volatile, although its contents may be deleted
  • Loads previously stored data into the main memory
  • Loads previously written programs into memory for processing by CPU
  • In the real world may be internal or external
  • Usually mechanical (eg Hard Drive, CD or DVD Writer) which slows a computer system
  • Data is usually “read” (loaded) or “written” (saved).

Logical Computer System Presentation Unit 2

output devices
Output Devices
  • Converts processed data, stored in main memory, into a form that can be understood by a human as information
  • Some sample real-world output devices; monitor (CRT or TFT/LCD), speakers, printer, plotter, robot, etc.

Logical Computer System Presentation Unit 2

slide10
CPU
  • CPU is an abbreviation of Central Processing Unit
  • The CPU is often called the Processor
  • The CPU is the computer’s brain
  • The speed of the CPU generally determines the efficiency and power of the computer system
  • The CPU consists of two sub-systems: The ALU (Arithmetic/Logic Unit) and the Control Unit. The former performs basic calculations and logical comparisons. The latter co-ordinates and runs the computer’s operations.

Logical Computer System Presentation Unit 2

activity
Activity

Complete the worksheet activity by identifying the correct components on the logical computer system model.

Logical Computer System Presentation Unit 2