________ computers are usally single user computer.

____ was the first computer using vaccum tubes.

__________ was the first practical stored program electronic computer.

___________was an electro-mechanical computer.

In 1981 IBM made the first fully portable computer named

__________ is the predecessor of computer.

The second generation computers were made up of

___________ are used for extremely complicated computations , such as by NASA for astronomical calculations , weather forecasting . etc.

The first generation computers were made up of

_________ Computer is a computer that performs calculations and logical operations with quantities represented as digits.