Noun
(computer science) a pointer that when pointed at a computer display senses whether or not the spot is illuminated
Source: WordNetlight-pen
A light pen could be used with the Type 30 to pick points on the display. Source: Internet
Because the user was required to hold his arm in front of the screen for long periods of time or to use a desk that tilts the monitor, the light pen fell out of use as a general purpose input device. Source: Internet
It used a 7.16 MHz 8088-2 processor, had 384k of memory (upgradeable to 640 KB on the motherboard), came with either one or two 5.25" internal floppy disk drives, had the light pen port (not a serial port) like the original Tandy 1000. Source: Internet
Two peripherals were also available for the Vectrex, a light pen and a 3D imager. Source: Internet
It used a light pen to guide creating and manipulating objects in engineering drawings. Source: Internet
The default type for undeclared variables not identified by such typing statements, is single-precision floating point ( 32-bit MBF ). citation GW-BASIC allowed use of joystick and light pen input devices. Source: Internet