(WANG 720C) Space Shuttle ARS⁄ATCS computer program

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An extract from Users Manual, Space Shuttle Atmospheric Revitalization Subsystem/Active Thermal Control Subsystem Computer Program, NASA - Johnson Space Center

"INTRODUCTION
Under continuing NASA sponsorship (NAS9-12411), Hamilton Standard has developed a Shuttle ARS (atmosphere revitalization subsystem)/ATCS (active thermal control subsystem) performance routine. This computer program is adapted from the Shuttle EC/LSS Design Computer Program developed under the basic contract. The new program has been upgraded in three noteworthy areas:
A. The functional ARS/ATCS schematic has been revised to accurately synthesize the Shuttle prime contractor's August 30, 1973 baseline system definition.
B. The program logic has been improved to provide a more accurate prediction of the integrated ARS/ATCS system performance. Additionally, the logic has been expanded to model all components and thermal loads in the ARS/ATCS system.
C. The program is designed to be used on the NASA JSC crew systems division's "programmable calculator" system. As written, the new computer routine has an average running time of five minutes.
The use of "desk top" type calculation equipment, and the rapid response of the program provides the NASA with an analytical tool for trade studies to refine the system definition, and for test support of the RSECS or integrated Shuttle ARS/ATCS test programs.
The program can be used for:
A. Pre-test predictions,
B. Real-time test support, and
C. Post-test analysis.
To support the RSECS test program, the user needs only to update the input data and make minor program revisions to accurately synthesize the RSECS hardware and test configuration.
The objective of this document is to define this computer program and provide the user with sufficient information for running and modifying the program as may be desired."

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ps: WANG 720C desktop calculator