What are the two functions of the control unit?
- It controls the internal operations of the CPU.
2. It reads and decodes (interprets) program instructions.
What are the functions of the arithmetic logic unit?
- It performs mathematical operations.
2. It performs logical operations or comparisons.
What are the functions of the main memory or random access memory (RAM) or immediate access storage (IAS)?
- It stores programs and data that are currently being used by the CPU.
- It stores the results of processing.
- Acts as a working storage.
Functions of secondary storage or auxiliary storage or backing storage.
- Stores programs and data not currently being used by the CPU for future use.
- Facilitate the transfer files from one computer to another.
- Facilitates the backing up a program and data files.
Function of input.
- Reads or accepts data in the computer.
Function of output.
- Shows or displays the results of processing.
The six main components of the computer.
- Control unit
- Arithmetic logic unit
- Main memory
4 . Secondary storage - Input next
- Output
Arithmetic operators
- +
- -
- *
- /
- Mod
- Div
Relational operators
- >
- <
- =
- > =
- <=
- <>
Logical operators
And, or, not
The machine cycle
- Fetching
- Decoding
- Executing
- Storing
What is fetching decoding executing and storing?
Fetching is the process of obtaining a program instruction or data item from memory.
Decoding is translating the instruction into a form (signals) that the computer can execute.
Executing is the process of carrying out the commands.
Storing is writing the results to memory not the storage medium.
The things a processor is dependent on.
Processor type processor speed number of cores word size.
Core
Core is the processing unit that receives instructions and performs calculations or actions based on the instructions.
Intel and AMD processors
Intel: Pentium Core Celeron
AMD: Athlon Sempron Turion Phenom.
