TSPS no. 1: Stored program control no. 1A

The Stored Program Control No. 1A processor complex was conceived as a program sequenced control for the Traffic Service Position System No. 1 and for the Electronic Translator Systems. It was designed to be a highly reliable complex using a conservative discrete component hardware design with excellent fault detecting capability and with exceptionally good automatic recovery of call processing when faced with hardware faults. The design aims, order structure, hardware features, fault detection, diagnostic, and recovery aspects of the system are described. Stress is placed on those features which are felt to be improvements over previous program controlled systems.