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

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

Part number: 371344

Used in: IBM 7090

Cap code: YW (details)

Symbol: E

E: Extender. Provides additional inputs to logical blocks and triggers. Adds to drivers the ability to drive more loads.

References: IBM Standard Modular System, Component Circuits, p84
SMS Cap Code Templates & Index

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.