Evolution of Laptop

This is first laptop in the world.

It was launched in 1981 with around 10kg of weight.
There was only 5inch CRT display in it.

It is 1982 model from GRiD Systems.
Weight: 4kg
It was first computer with flat panel display.

RS-80 Model 100
Released in 1983 have 40 character X 8 lines text only display.
Weight: 1.7kg
This model was using 4 "AA" batteries and audio cassett for storing data.

This is Macintosh Portable.
Weight: 6.8 kg.
10 hours of battery life. It was first laptop with graphics.

Realeased on 1989.
It is LTE laptop from compaq. It comes with harddrive and floppy also.
Weight: 2.8kg

PowerBook from apple(1991).
Keyboard and optical ball navigation.

ThinkPad 700C by IBM(1992)
It is first computer with 10inch matrix color display.

Apple powerbook G4(2001)
Titanium body and 15 inch display.

TravelMate C100
Company: Acer
Released: December, 2002
touchscreen tablet

MacBook Air(2008)
Ultraslim, 0.16 in
Weight: 1.3kg
It is the slimmest laptop ever.

ThinkPad X300(2008)
Lenovo Series
Less than 1 in. thick
Weight: 1.3 Kg