* Analog Computers
-most extinct today
-can perform several mathematical operations simultaneously
-uses continuous variables for mathematical operation
-utilizes mechanical or electrical energy
* Hybrid Computers
-combination of digital and analog computers
-digital segments perform process control by conversion of analog signals to digital ones
* Mainframe Computers
-have the capacities to host multiple operating systems and operate as a number of virtual machines and can thus substitute for several small servers
* Microcomputer
-computer with a microprocessor and its central processing unit
-can be called as personal computers
* Desktops
-intended to be used on a single location
-widely popular for daily use in workplaces and households * Laptops
-miniaturized and optimized for mobile use.
-its portability and capacity to operate on battery power have served as a boon for mobile users * Personal Digital Assistants (PDAs)
-handheld computer
-palmtop
* Minicomputers
-smaller than mainframe computers, bigger than microcomputer
-mid-range system or workstation * Supercomputers
-highly calculations-intensive task
-large transaction processing power * Wearable Computers
-record-setting step in the evolution of computers
-consistently in operation as they do not have to be turned on and off
-constantly interacting with the user
Elements of the Computer System * Hardware Devices * Software System
-Operating System
-Middleware
-Application
Part of the Computer
A computer is made up of four essential parts: * System unit * Monitor * Keyboard * Mouse
The system unit is the main part of the computer. It houses all the components that make the computer run.
System unit is composed of:
-Central Processing Unit (CPU) * “microprocessor” * brain of the computer * performs all the operations that computer does
-Random Access Memory