TSPS No. 1: Stored Program Control No. 1A

Abstract

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.

Traffic Service Position System No. 1: Automated Coin Toll Service: Software

“…To save development effort, the SPC program used to load from the Program Tape Unit (PTU), 4 compare with PTU tape, and dump the memory contents of the SPC stores to a PTU tape is used to perform the same functions for the SSAS announcement stores. However, since there are some significant differences regarding tape format, loading procedures, and priority levels between the SPC stores and the an nouncement stores, some changes were made in the PTU program to extend its capabilities.…”

“…4 Upon occurrence of a Clevel interrupt, appropriate fault recognition programs are entered which first determine whether SSAS caused the interrupt, and then by performing some tests isolate the faulty SCAB. The nature of failure and its degree of seriousness are also passed to SSAS reconfiguration programs.…”

“…4 Upon occurrence of an F-level interrupt, appropriate fault recognition programs are entered to analyze the faults present in SPC-SSAS interface areas. These programs have the capability of distinguishing serious faults from nonserious faults and reporting them to appropriate recon figuration programs.…”

“…1A (SPC 1A) is the TSPS main processor. 4 The SPC memory is used for both programs and data. It is partitioned into a maximum of 24 duplicated stores.…”