Accession Number : ADD003964

Title :   Interface System for a Computer Terminal and Random Access Slide Projector.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Kirby,Paul J ; Gardner,Edward M

Report Date : 03 May 1977

Pagination or Media Count : 8

Abstract : An interface system for a PLATO 4 computer terminal and random access slide projector that permits use of standard slides. The terminal keyboard selects a slide number which causes a strobe signal and binary signal representing the number to be transmitted to the interface. The number is latched in the interface upon reception of the strobe and then fed to a programmable read only memory (PROM) where the binary signal is algorithmically converted into a base 9 system. The output of the PROM is fed to decoders which convert the base 9 numbers into high and low order signals and are then fed to the slide projector after passing through inverter drivers and protective diodes. The interface also controls the ON/OFF position of the projector and generates an access signal to the projector after it has received the slide number in proper form. (Author)

Descriptors :   *Patents, *Data processing terminals, *Still projectors, *Read only memories, Keyboards, Interfaces, Random access computer storage, Algorithms

Subject Categories : Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE