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Scarce chorded keyset input device created by computer pioneer Douglas Engelbart, similar to the type used in his iconic 1968 'Mother of All Demos.' The keyset, made in an uncommon black-and-brown theme, measures 5″ x 5.5″ x 1.25″ and features five keys (permitting 31 key-press combinations), for typing and entering commands. The underside of the keyset is padded in cork, and it retains its gray cord terminating in a Cannon serial connector. In very good to fine condition, with the second and third keys somewhat sticky; the others travel well.
The five-button coding keyset was first publicly demonstrated in the 'Mother of All Demos,' where Engelbart presented many of the technological ideas that are now commonplace—including the computer mouse, hypertext, multiple windows, video conferencing, and shared editing of online documents. The keyset was meant to supplement—not replace—a traditional keyboard. Where a keyboard required a user to lift their hand from the mouse and look away from the screen, the keyset allowed them to continue using the mouse while typing by pressing down multiple switches simultaneously to make 'chords,' like a piano player. Using binary code, each 'chord' would input a specific character.
The keyset and Engelbart's three-button mouse also worked together—the keyset's 31 combinations permitted input of all 26 letters of the alphabet, plus standard punctuation marks (comma, period, semicolon, question mark, and space). Used in conjunction with the keyset, the mouse buttons functioned as shift and command keys: with the middle button pressed, letters shifted to uppercase and other punctuation marks were accessible; pressing the left mouse button allowed entry of numbers and a further selection of punctuation and symbols.
The 'Mother of All Demos' would prove to be massively influential, though it took well over a decade for Engelbart's ideas to become mainstream. In the early 1970s, much of Engelbart's original team ended up at Xerox PARC, where they continued their research in human-computer interaction and kept improving upon the mouse. While touring Xerox PARC in 1979, Steve Jobs witnessed the concepts of the mouse and the graphical user interface (GUI) in action. Impressed by their user-friendliness, he aimed to simplify and incorporate these intuitive features into Apple's computers.
