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Video Displays

Ivan Sutherland demonstrating Sketchpad on the TX-2

Sutherland demonstrates the Sketchpad program, part of his MIT PhD thesis and generally recognized as the first computer-aided drafting (CAD) program. Drawings were highly structured. Changing a master object template changed all instances of its use.

Video Displays

Pictures are worth a thousand words—and most people more readily “look” than read. Video displays satisfy that instinct. They also let us see and act on information as soon as the computer generates it.

Analog radar displays date from World War II. Video displays for digital computers were developed in the early 1950s for MIT’s Whirlwind computer and for Ferranti Canada’s DATAR multi-ship naval defense computer.

Initially, video was expensive, both in dollars and computing power. For years, only research and the military, where power and cost were secondary concerns, used video.

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Circular monitor display for Whirlwind

Whirlwind, operational in 1951, may have been the first computer to display text and graphics on a video terminal.

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Light pen and interface box (prototype)

Light pens were developed about 1952 to select points on the video display of MIT’s Whirlwind computer. One disadvantage was that you couldn’t point to a dark area.

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Airborne SAGE radar

Aircraft fed radar data to SAGE air-defense computers. A small light pen for graphical input is in the operator’s right hand.

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Spiral scanner

Scanner operators were busy: they analyzed experimental data by simultaneously using two computer monitors, a projector showing an image on the desktop, a trackball pointing device and a one-handed keypad. The computer in the background is a DEC PDP-4.

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Video Displays in all Sizes

Most early computer displays used bulky CRTs - cathode ray tubes - like those inside televisions at the time. Some scanned horizontal lines in sequence, like a TV, and others could draw in an arbitrary order.

Experiments with flat display panels started in the 1960s, but it took thirty years for them to become dominant, as they are today.

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VT04 Graphic Display system console

This video console, with light pen and digitizing tablet, was part of the Graphic-15 Graphic Display System, a DEC PDP-15 computer accessory.

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Tektronix 4012 Graphics Terminal

Tektronix’s 4010-class terminals used special video storage-tube displays. They provided good-quality graphics without expensive memory, but users could only erase the whole screen at once. Two thumbwheels provided basic cursor control.

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VT100 video terminal keyboard

An Intel 8080 CPU provided the VT100 with advanced features such as bold characters and multiple text and graphic character sets. Its success inspired other terminal makers to emulate those features.

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Liveboard interactive video display

Liveboard was a pen-based, networked, interactive “whiteboard” supporting multiple remote documents. PARC’s Ubiquitous Computing program developed Liveboard; a spin-off company offered a commercial version. By 2000, more than 2,000 Liveboards had been sold.

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Plasma video display

PLATO educational computer system terminals used plasma displays in 1964. Because the displays stored images independently, they didn’t require extra computer memory.

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Braille display (prototype)

This prototype display evolved into a portable “reader” that converted scanned text into tactile output for blind users.

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VT100 terminal

An Intel 8080 CPU provided the VT100 with advanced features such as bold characters and multiple text and graphic character sets. Its success inspired other terminal makers to emulate those features.

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TI-99/4 home computer color monitor

Home computers in 1979 often used television sets as displays. But TI’s computer-to-TV adapter (radio frequency modulator) was not yet FCC-approved, so TI had Zenith modify a standard TV to allow direct connection to the new TI-99/4 home computer.

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Color Pivot video monitor

This monitor rotated between portrait and landscape orientations, automatically reformatting the displayed material. It was convenient, but cost almost $1,700.

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IBM 581 plasma video display (prototype)

This prototype plasma display was released in 1984, just as laptop computers were beginning to appear on the market. Its flat shape was attractive, but liquid-crystal displays ultimately dominated.

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