La storia dell'informatica

Il primo abaco

L' abaco babilonese è stato sviluppato per ridurre il tempo necessario per eseguire calcoli.

Come affermato nel capitolo precedente, crediamo che i babilonesi abbiano inventato il conteggio complesso.

Il periodo 2700–2300 aC vide probabilmente la prima apparizione di un abaco, una tabella di colonne successive che definiva gli ordini di un sistema numerico a 60 cifre .

Abaco 2.0

L' abaco romano utilizzava numeri romani a 10 cifre per ridurre il tempo per eseguire calcoli:

Immagine: 1911 Enciclopedia Britannica (di pubblico dominio).

I romani svilupparono l'abaco romano, una versione portatile in base 10 dei precedenti abacus usati dai babilonesi.

Questo è stato il primo computer palmare al mondo. Utilizzato da ingegneri romani, mercanti ed esattori delle tasse.

Computer analogici

The Difference Engine (Charles Babbage 1822) was a mechanical machine designed to Reduce the Time to calculate complex mathematical functions.

The Analytical Engine (Charles Babbage 1833) was a mechanical machine designed with modern computer elements like arithmetic, logic, and memory.

Both these "computers" used 10 digit (decimal) mechanical cogwheels to perform mathematical calculations:

(Charles Babbage's Analytical Engine. Science Museum. London)

Digital Computers

Digital Computers use 0/1 switches to perform calculations. They operate on binary values like 11100110 in contrast to analog values like 230.

Try It Yourself:

The first Electric Digital Computer was designed and built by Konrad Zuse in Germany (1941).

It used 2600 electrical relays as 0/1 switches. The clock speed was about 5 Hz.

Replica of the Zuse Z3. Deutsches Museum. Munich.

Electronic Computers

First generation Computers (1945-1950) used vacuum tubes as binary switches.

Vacuum tubes are much faster than electrical relays.

The clock speed of these computers was between 500 KHz and 1 Mhz.

Second Generation Computers

Second generation Computers (1950-1960) used transistors as binary 0/1 switches.

Transistors are much faster than vacuum tubes.

Third Generation Computers

Third generation Computers (1960) used integrated circuits as binary switches.

Integrated circuits are much faster than transistors.

Computer Speed

The first electrical computer could do 5 instructions per second.

The first electronic computer did 5000 instructions per second.

The first PC did 5 million instructions per second.

AMD was the first PC to reach 1 billion instructions per second.

Today, IPhone 12 can do 11 billion instructions per second.

When Did it Start? Where Will it End?

From the history above you can extract:

• Computers were designed to do calculations
• Charles Babbage created the first mechanical computer
• The first digital computers used electromechanical switches
• Vacuum tubes are much faster than electromechanical switches
• Transistors are much faster than vacuum tubes
• Integrated circuits are much faster than transistors
• Tomorrow's computes will be faster than the human brain?

Smarter Than Humans?

If we believe in Moores Law:

In 2020, computers have the capacity of a mouse brain.

In 2030, computers might have the capacity of a human brain:

Source: Ray Kurzweil