NASA Office of Logic Design

NASA Office of Logic Design

A scientific study of the problems of digital engineering for space flight systems,
with a view to their practical solution.

AP-101 Computers

The new AP101S General-Purpose Computer (GPC) for the Space Shuttle

Norman, P. Glenn (IBM Corp.)

IEEE, Proceedings Volume: 75 Page: 308-319
Mar 01, 1987


This paper describes the development of the new AP101S General-Purpose Computer (GPC) for the Space Shuttle Orbiter. The AP101S evolved from a line of pipeline processors flexible enough to support the Space Shuttle requirements. It offers many features vital to the expected needs of the space program. This paper describes the design philosophy, methodology, primary features, and functionality of the AP101S. The testing and development, which led to the integration of the processor are also detailed. Finally, the application of using it on-board the Space Shuttle Orbiter is portrayed. Indeed, the AP101S is an integral part of an aggressive and expanding Space Shuttle program, and is one which will serve well into the future.

Airborne Computer Technology

W. T. Chow
IBM Electronics Systems Center
Owego, New York

Proceedings of the Tenth Space Congress
Cocoa Beach, Florida
April 11-13, 1973
pp. 4-19 through 4-28


The development of airborne digital computer has been greatly influenced by rapid technological advances.  This paper provides an overview of the present status and the direction of further evolution.  It discusses the changes that are taking place in the areas of hardware, software, and computer organization; and suggests a number of approaches towards a broadened usage of airborne computer to take advantage of its increasing capability and decreasing cost.

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