unidad 1

UNIDAD 1

THE HISTORY OFCOMPUTERS

WHAT IS A COMPUTER?

A computer is an electronic machine that accepts information (Data), processes it according to specific instructions, and provides the results as new information.

Monitor

Floppy Disk Drive

System Unit

Keyboard

CD-ROM / DVD-ROM

Drive

Mouse

III- ELECTRICAL COUNTING MACHINES

along with punchedcards instead of mechanical gears.

9- The US census of the 1880 took 9 years to compile and led to inaccurate figures. To solve the problem, Herman Hollerith invented a calculating machine that used electricity

1888

III- ELECTRICAL COUNTING MACHINES

11- MARK I was built by a team from IBM and Harvard University. Mark I used mechanical telephone switches to store information. It accepted data on punched cards, processed it and then output the new data.

1943

51 feet long and weighed over 5 tons

IV- ELECTRONIC COUNTING MACHINES

12- The ENIAC was the first US-built all-electronic computer built to perform ballistics calculations. (Away from IBM)

1946

TRANSISTORS ON A CIRCUIT BOARD

Transistors

Capacitor

Resistors

TWO INVENTIONS THAT CHANGEDTHE WAY COMPUTERS ARE BUILT!!

1961

The IC revolutionized the entire electronic technology. Ex: The Pentium Processor contains 3.1 Million Transistors in 1.5 inch square!

2- The (IC) Integrated Circuit

HOW THE PROCESSOR (CPU) IS PLACED ON THE MOTHERBOARD

Intel 486 CPU

RAM

1975 - 1981

The Altair The Apple I The FloppyDisk

The Hard Disk

MS-DOS

1981 - 1993

The IBM PC The Compaq portable Computer

The AppleMacintosh

MS-Windows 3.0 The Pentium

Chip

INTEL PENTIUM PROCESSORS

PENTIUM

PENTIUM II

PENTIUM Pro

The boy walks quickly.

“quickly” is an adverb

because it tells us how

the man walks.

The boy walks quickly.

A word adding to the

meaning of a verb is called an adverb.

The boy walks quickly.

Most adverbs are formed by adding ‘ly’ to an adjective.

brave bravely

fortunate fortunat

ely

noisy

noisily

soft

softly

skilful

skilfully

careful

carefully

anxious anxiously

bitter bitterly

brutal brutally

careful carefully

fearless fearlessly

noble nobly

Underline those words which are

not adverbs:

Underline the adverbs in the

following sentences.

Underline the adverbs:

In a library we should

talk quietly.