Abstract
Abstract : The Programmable Film Reader, consisting of digital computer, magnetic tape units, CRT, and film transport with optical and electronic circuits, is a device for reducing radar A-scope film data to digital form. This is done by scanning selected portions of the film with a spot of light under program control. The relative amount of light passing through the film is measured by the device and reported back to the computer for processing. A set of computer programs, called the Film Reading Program System, has been written for the PDP-1 computer and Programmable Film Reader. These programs will read films in three formats; A-scope traces, A-scope traces with fiducial marks and Project Radar A-scope traces. The amplitudes of the traces are sampled up to about 500 times and the digitized results written onto magnetic tape in IBM format. This report presents a description of the computer programs together with flow charts and listings. The reader is presumed familiar with the PDP-1 computer and the MACRO assembly language. The latest modification to the system adapts it for use with the MIDAS assembly program and with a new high-speed magnetic tape system on the PDP-1 computer.
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