When Was The First Portable Computer Invented

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When was the first portable computer invented?
The IBM 5100 is the first portable computer, which was released on September 1975. The computer weighed 55 pounds and had a five inch CRT display, tapedrive, 1.9MHz PALM processor, and 64KB of RAM. In the picture is an ad of the IBM 5100 taken from a November 1975 issue of Scientific America.

What is the computer?
A computer is a generalpurpose device that can be programmed to carry out a finite set of arithmetic or logical operations. Since a sequence of operations can be readily changed, the computer can solve more than one kind ofproblem.
Conventionally, a computer consists of at least one processing element, typically a central processing unit (CPU) and some form of memory. The processing element carries out arithmetic and logicoperations, and a sequencing and control unit that can change the order of operations based on stored information. Peripheral devices allow information to be retrieved from an external source, and theresult of operations saved and retrieved.

When the first electronic digital computers were invented?
The first electronic digital computers were developed between 1940 and 1945 in the UnitedKingdom and United States. Originally they were the size of a large room, consuming as much power as several hundred modern personal computers .In that time the computers were use by the military.

Whoinvented the computer?
Many say the first computer is the "difference engine." The first of these devices was conceived in 1786 by J.H. Müller. It was never built. 

Difference engines wereforgotten and then rediscovered in 1822 by Englishman Charles Babbage. He is known as "the father of the Computer". This machine used the decimal numbers system and was powered by cranking a handle. TheBritish government first financed the project but then later cut off support. Babbage went on to design his much more general analytical engine but later returned and produced an improved design (his...
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