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

Function of the card:
Plus Exclusive OR (in-phase load)

Part number: 371289

Used in: IBM 7090

Symbol:+OE

+OE: Positive Exclusive OR. In-phase output is positive only when inputs differ (A up, B down, or B up and A down). Out-of-phase output is negative for the above conditions.

References: IBM Standard Modular System, Component Circuits, p66
This page created by Ken Shirriff on Wed Sep 15 18:15:11 2021.

The information on these pages comes from a variety of sources, especially old IBM documents on bitsavers.org, 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.