Graphical Display Adapter provides a real time display for digital computerized experiments. This display uses a memory oscilloscope which records a single trace until erased. It is a small hardware unit which interfaces with the J-box feature of the SDS-930 computer to either an X-Y plotter or a memory oscilloscope

Robertson, J. B.

English

NASA Technical Reports Server

December 1967
	 Brief 67-10654 
NASA TECH BRIEF
i:i:• 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
X—Y Plotter Adapter Developed for SDS-930 Computer 
GRAPHICAL DISPLAY TEST PROGRAM OUTPUT 
A Graphical Display Adapter and the required 
supporting program package were developed to pro-
vide a real-time display for' digital computerized 
experiments. This display uses a memory oscilloscope 
which records a single trace until erased. Tables of 
data can be drawn quickly to form three-dimensional 
plots. These scope plots can be very useful to an 
experimenter using the computer for simulation. 
Experiments gathering statistics can display histo-
grams, mean vectors, and matrices of data. 
The software program allows a programmer to call 
plotter functions as Fortran subroutines. Separate 
versions allow the use of either Fortran Il or Real 
Time Fortran II on the SDS-930 computer. 
The Graphical Display Adapter is a small hardware 
unit which interfaces with the i-Box feature of the 
SDS-930 computer to either an X-Y plotter or a 
memory oscilloscope. 
Notes: 
1. This development is presently being used to plot 
probability distribution curves in radio frequency-
modulation studies. It is also intended for general 
use as a laboratory test apparatus for real-time 
displays.
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THREE DIMENSIONAL DISPLAY BIVARIATE GAUSSIAN 
2. The advantages of this system include the real-
time plotting of computed data and elimination of 
compatibility considerations in handling magnetic 
tape and peripheral display devices. The system 
also includes a logic and control panel for interfac-
ing between the SDS-930 and the X-Y plotter or 
storage tube display and offers a computer sub-
routine program for timing and control of plot-
ter functions. 
3. Inquiries concerning this invention may be di-
rected to:
Technology Utilization Officer 
NASA Pasadena Office 
4800 Oak Grove Drive 
Pasadena, California 91103 
Reference: B67-10654 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code 
GP, Washington, D.C. 20546. 
Source: John B. Robertson 
Jet Propulsion Laboratory
(N P0-10220)
Category 06 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights. 
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X-Y plotter adapter developed for SDS-930 computer

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