![]() The statistical results indicate that the mouse is faster and more accurate than any other device. Bill English describes the experiments in Selection Techniques for Text Manipulation. The evaluation of graphical input devices for text editing compared the light pen, with joysticks, and with a new development called the mouse. We will look now at these two instruments for user input. With his right hand he holds a mouse, and under his left hand is a five-finger chording keyset. 3.2 shows Engelbart’s NLS workstation around 1967. The famous NLS demo at Fall Joint Computer Conference December 1968 makes frequent use of split screens and overlay effects.įig. Equipment to mix different channels was also reasonably cheap. A simple inversion leads for the first time to a positive display of text on screen. įurthermore this detour offers the advantage to experiment with the video signal. A high-quality video camera is mounted in front of each screen, takes the picture, amplifies the signal and transmits it to the TV sets in the offices. The time-shared mainframe computer generates images on a couple of 5" raster-scan displays. That’s why Doug Engelbart chose the indirect way. Smaller 5" monitors are affordable but not sufficient for an ergonomically designed computer workplace. The original proposed 17" computer monitors would cost about $15,000 to $20,000. An inhouse cable TV network is used to deliver the signal to the offices of the ARC members. 16).īy the end of the 1960s the output screen is a conventional TV monitor (cf. The text editing capabilities of NLS have already been discussed in 2.1.3 NLS/Augment (p. ![]() All source code, reports, internal documentation, e-mails and printed letters at ARC are written with NLS in order to discover improvements for the next generation of the system. The term bootstrapping is coined by Engelbart to describe, that all systems are not only developed but also used extensively by the members of the Augmentation Research Center (ARC). The main design principle was to continuously improve the physical and mental relation between human and the machine. ![]() In Vision and Reality of Hypertext and Graphical User Interfacesĭoug Engelbart and his team at SRI did a lot of research work on the design of in- and output devices.
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