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

Function of the card:
Two-Way AND-Block Extender

Part number: 371325

Used in: IBM 7090

Symbol:E

E: Extender. Provides additional inputs to logical blocks and triggers. Adds to drivers the ability to drive more loads.
IBM SMS card type DEYW 371325 IBM SMS card type DEYW 371325

Image courtesy of Computer History Museum

References: IBM Standard Modular System, Component Circuits, p77
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 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.