green screen

Green screen was the common name for a monochrome CRT computer display using a green “P1” phosphor screen.
Abundant in the early-to-mid-1980s, they succeeded teletype terminals and preceded color CRTs as the predominant visual output device for computers.
The most famous green screen product is arguably the original IBM PC monochrome display, designated the IBM 5151 (the PC itself had the model number 5150). From the outset, the 5151 was designed to work with the PC’s Monochrome Display Adapter (MDA) text-only graphics card, but soon the third-party Hercules Graphics Card became a popular companion to the 5151 screen because of the Hercules’ high-resolution bitmapped monochrome graphics capability, much used for business presentation graphics generated from e.g. spreadsheets like Lotus 1-2-3.
Some green screen displays were furnished with a particularly full/intense phosphor coating, making the characters very clear and sharply defined (thus easy to read), but generating a somewhat…

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