Improved technique was developed for transferring and storing data at faster than real time speeds on hybrid computer. Predominant advantage is combined use of electronic relays, track and store units, and analog-to-digital and digital-to-analog conversion units of hybrid computer

Hansing, A. M.

English

NASA Technical Reports Server

October 1972	 B72-10680 
NASA TECH BRIEF 
Marshall Space Flight Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
An Improved Data Transfer and Storage Technique for Hybrid

Computation 
CL
CIL 
T/S 
From 
Digital	 DAC ADC	 To Digital 
Memory Memory 
Yi
An improved technique has been developed for trans-
ferring and storing data at faster than real time speeds on 
a hybrid computer. This technique was developed for 
use with advanced control systems which require reduced 
sensitivity to adverse operating conditions. The technique 
uses one analog circuit for multi-operating conditions (see 
figure). The predominant advantage of this technique is 
the combined use of the electronic relays, track and store 
units (T/S), and analog-to-digital (ADC) and digital-to-
analog conversion (DAC) units of a hybrid computer to 
increase data transfer and storage capabilities. 
The state variables, xi, Yi, (see figure) are integrated in 
real time until t 1 . The values of Xj and yi are sampled 
using control line 2 (CL 2) and stored in the digital 
memory. These stored values of xi and yi become the 
initial conditions for high speed repetitive runs from t' to 
t2 . When control 1 (CL 1) is set equal to a logic one, the 
value of xi at t 1
 is sent from digital memory through the 
DAC to the track and store amplifier. With CL 1 equal to 
zero, the negative value of yi is sent from digital memory 
to the DAC. The track and store amplifier and the DAC 
hold the values of xi and yi at t 1 , thus, becoming the 
initial conditions for the high speed repetitive runs from 
t 1 to t2 . The locations in memory where these state 
7_A^
 variables are stored are then assigned by block to the two 
simulated conditions.
Fewer analog components are required to obtain values 
of the state variables to be used as initial conditions. The 
use of digital memory for storage allows the program to 
remember sets of initial conditions for each simulated 
condition under study without any additional analog 
hardware. The primary feature of this technique is the use 
of digital memory to store sets of initial conditions and 
the resulting reduced requirements in analog hardware. 
Note: 
Requests for further information should be directed 
to:
Technology Utilization Officer 
Marshall Space Flight Center 
Code A&PS-TU 
Marshall Space Flight Center, Alabama 35812 
Reference: B72-10680 
Patent status: 
NASA has decided not to apply for a patent. 
Source: A. M. Hansing of

Lockheed Missile and Space Company

under contract to

Marshall Space Flight Center

(MFS-22043) 
Category 02, 09 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights. 
https://ntrs.nasa.gov/search.jsp?R=19720000679 2020-03-17T03:42:26+00:00Z


An improved data transfer and storage technique for hybrid computation

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