This page describes the IBM SMS card "DQS", and is part of the SMS card database.

Part number: 372155

Used in: 7040


TB: Trigger (Binary). A trigger whose steady state outputs change upon the transition of the input, i.e., usually going plus to minus, or sometimes going minus to plus.
IBM SMS card type DQS 372155 IBM SMS card type DQS 372155

Image courtesy of Ron Hashiro

This page created by Ken Shirriff on Wed Sep 15 18:15:09 2021.

The information on these pages comes from a variety of sources, especially old IBM documents on, as well as information from the IBM 1401 restoration team, especially Tim Coslet's SMS data and Jim Hunt's data. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.