Electronic circuit enables the computer to?
- Perform arithmetic operations
- Evaluate logical conditions
- Process input and output data
Three types of a computer system
- Processing unit
- Input device
- Output device
Processing unit (CPU)
Processes inputted data, prepare results and produces output.
Used for inputting data and instruction into a computer system. E.g. mouse, keyboard
Used for displaying results. E.g. monitor, speakers
Central Processing Unit comprises of?
- Arithmetic Logic Unit
- Memory (RAM, ROM, Registers)
- Control unit
Arithmetic Logic Unit
- Performs simple arithmetic operations (addition,subtraction…..).
- Necessary to execute instructions.
*Also makes logical decisions like yes/no true/false*
Memory (RAM, ROM,Registers)
Stores data/instructions for execution
Fetches data/instructions from memory and determines their type
Types of memory
- Internal memory
- External memory
- Primary (ROM, RAM)
- Secondary (HDD)
Secondary (Floppy, CD-ROM)
What is external memory?
Externally located, random access memory, that stores data and programs in file format for storage.E.g. HDD, CD-ROM
What is internal memory?
Located on the motherboard, stores inputted data/instructions for execution and storage for future use.E.g. RAM, ROM
Alterable, volatile memory that stores data/instruction that is currently in use.
Inbuilt, in alterable, non volatile memory used for system software,which does essential tasks, like POST