Browse Prior Art Database

Intersystem Communication for IBM System/7

IP.com Disclosure Number: IPCOM000089660D
Original Publication Date: 1977-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Dunn, JM: AUTHOR [+2]

Abstract

Multiple IBM System/7's are able to communicate via the IBM 5012 Multifunction Module or the IBM 5013 Digital Input/Output (DI/DO) Module. The System/7's utilize the same Digital Input (DI) interface cards that support the IBM Digital Input (DI) multiplexer family for the System/7.

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Intersystem Communication for IBM System/7

Multiple IBM System/7's are able to communicate via the IBM 5012 Multifunction Module or the IBM 5013 Digital Input/Output (DI/DO) Module. The System/7's utilize the same Digital Input (DI) interface cards that support the IBM Digital Input (DI) multiplexer family for the System/7.

A single System/7 serves both as a backup system for the application and a data logging system for one or more primary systems. Alternative solutions are available, but are not as efficient or cost effective.

The intersystem communication approach utilizes the existing IBM 1018 Paper Tape Punch Attachment embedded in an Application Monitor System (AMS) as the communication module. The backup System/7, when in the data logging mode, uses one group of DI and one-half group of DO (per primary system) to simulate the primary system's 1018. The primary system, in turn, uses one group of :DO and one-half group of Process Interrupt (PI) to drive this pseudo 1018.

The backup system retains its application support and data logging support on disk, selecting the correct mode of operation by monitoring the status of the primary systems. On a primary system failure, the data logging routine is rolled out and the application support rolled in.

Since all the 5013 DI is allocated for multiplexer support in the Toll Ticketing System (TTS) Application, a method for sharing this DI to read the primary system communication bus in the data logging mode was devise...