This paper discusses a system called DISPLAYTRAN that interpretively executes FORTRAN statements entered at a display console, allowing graphics users to perform unanticipated computations and to more easily debug graphics application programs. The relationships among the operating system, the display terminal, and the computing system are discussed, and the major components of this system are described. A command language, the FORTRAN IV subset, and the graphics language provided for users are presented. Internal operation of the graphic facility is outlined.
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