Computers 101: Understanding Computer

Variation A

A programmable device that can store, retrieve,
and process data. The computer's brain is the
microprocessor, which is capable of doing math,
moving data around, and altering data after
retaining it in binary code.

Variation B

A programmable device that:

(1) Responds to a specific set of instructions
in a well-defined approach.

(2) Executes a prepared list of instructions
(also called a program).

Modern computers are electronic plus digital.

The physical equipment--wires, transistors,
and circuits--is called hardware.

The instructions and data are called software.

Hardware Elements Found In
General-Purpose Computers

(1) Memory: Allows a computer to temporarily keep
data and programs.

(2) Mass Storage Device: Enables a computer to permanently retain large amounts of data.

(3) Input Device: The channel through which data
and instructions enter a computer.
Usually constituted by a keyboard and mouse.

(4) Output Device: A display screen, printer,
or other device that enables a computer
to show what it has achieved.

(5) Central Processing Unit (CPU): The brains
of a computer. It interprets and executes programs
instruction and also coordinates the interaction of input,
output, and storage devices.

(A) General Classification Of Computers
By Increasing Size And Power

(B) General Classification Of Computers
By Increasing Size And Power