1st — Mouse

In 1961, during a conference lecture, Engelbart sketched a device with two perpendicular wheels—one for X-axis movement, one for Y-axis. The device would remain stationary relative to the desk; rolling the wheels would generate proportional cursor movement. This “relative positioning” eliminated the need for re-centering. By 1963, engineer Bill English (working under Engelbart) built the first functional prototype.

The first mouse remained an obscure SRI prototype for four years. Its unveiling occurred at the Fall Joint Computer Conference in San Francisco, in what is now legendary as 1st mouse

The first mouse has had a lasting impact on computing history. It inspired the development of modern computer interfaces, including: In 1961, during a conference lecture, Engelbart sketched

: It had a single red button on the top-right corner. during a conference lecture