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The endocardial contour of an end-systolic and an end-diastolic frame was digitized with a light pen on an electronic drawing board.
The process is carried out by means of a light pen which reads a bar code which transmits information on to a magnetic tape.
A light pen detects a change of brightness of nearby screen pixels when scanned by cathode ray tube electron beam and communicates the timing of this event to the computer.
In that system, the user could draw using a light pen on a screen and manipulate graphic primitives such as arcs and lines.
Terminals provided data entry capability into mainframes as well as light pen pointing and selection before the mouse was in use.
The light pen itself had a small photoelectric cell in its tip.
The computer had a wide selection of ports, including one for a light pen.
The other system, still in use in 2004, is based on a magnetic card and a voting machine with a light pen.
The light pen allows the user to draw, to create images and to indicate, on the screen.
The right monitor, which played the preview video, was used by the editor to make cuts and edit decisions using a light pen.
The 6845 had support for a light pen, an alternative to a computer mouse.
The light pen found use during the early 1980s.
Another innovative feature for that time was the user interface combining a keyboard with a monitor and light pen for correcting texts and drawing on screen.
Another innovative feature for that time was the user interface combining a keyboard with a monitor and light pen used for correcting texts and drawing on screen.
As the tip of the light pen makes contact with the screen, it sends a signal back to the computer containing the coordinates of the pixels at that point.
