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

Function of the card:
Three-Way OR (out-of-phase load)

Listed in 1401 SMS card usage

Part number: 371230

Used in: IBM 729II, IBM 7070, IBM 7090


+O: Positive OR. In-phase output is positive if one or more input signals are positive. Out-of phase output is negative for the above condition.
IBM SMS card type ADYY 371230 IBM SMS card type ADYY 371230

References: IBM Standard Modular System, Component Circuits, p23
This page created by Ken Shirriff on Sun Dec 16 16:11:05 2018.

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.