Specifications

NSTS 21000-IDD-760XD
2
INTRODUCTION
The Payload and General Support Computer (PGSC) is a service used to support Shuttle and
Payload on-orbit operations. The primary functions are command and display of non-critical
payloads and additional crew information services.
The number of PGSC’s manifested is determined on a flight-by-flight basis. The Space Shuttle
Portable Onboard Computer Control Board determines flight-by-flight configurations. Sufficient
PGSC’s are always flown to satisfy the requirements of all users and to provide adequate
backup capability.
In addition, the PGSC hardware is a Space Shuttle controlled resource. The “flight-like” PGSC
system with power supply and communications cabling may be obtained on loan for two
weeks. It has the same configuration as the regular flight PGSC and may be used by the
user/experimenter for final verification of software/hardware operation and interfacing.
The Portable Onboard Computer Control Board will control changes to this document.