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Àbacus
The abacus is a percussion instrument used to carry out simple1 arithmetic (addition, subtraction, division and multiplication) and more complex ones (such as calculating roots). It consists of a wooden box with parallel bars running movable balls, also useful for teaching these simple calculations. -
The pascalie
The pascaline was the first calculator that worked on wheels and gears, invented in 1642 by the French philosopher and mathematician Blaise Pascal. Then he called it «pascaline wheel», and finally «pascaline». -
The adding machine
An adding machine is a type of calculator, usually specialized for accounting calculations. In most countries of the world, very old adding machines were generally built to read in dollars and cents. -
The turning machine
The machine operates on an infinite memory tape divided into discrete "cells". The machine positions its "head" over a cell and "reads" or "scans" the symbol there. ... The Turing machine was invented in 1936 by Alan Turing, who called it an "a-machine" (automatic machine). -
The eniac
The combination of speed and programmability allowed for thousands more calculations for problems, as ENIAC calculated a trajectory in 30 seconds that took a human 20 hours . -
The modem
The goal is to produce a signal that can be transmitted easily and decoded reliably to reproduce the original digital data -
The first hard drive
Each generation of disk drives replaced larger, more sensitive and more cumbersome devices.
When hard drives became available for personal computers, they offered 5-megabyte capacity. -
The mause
A computer mouse is a hand-held pointing device that detects two-dimensional motion relative to a surface. The first public demonstration of a mouse controlling a computer system was in 1968. Originally wired to a computer, many modern mice are cordless, relying on short-range radio communication with the connected system. -
RAM
Random-access memory is a form of computer memory that can be read and changed in any order, typically used to store working data and machine code. A random-access memory device allows data items to be read or written in almost the same amount of time irrespective of the physical location of data inside the memory. In today's technology, random-access memory takes the form of integrated circuit chips with MOS memory cells.
