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

Function of the card:
Drum Load Card

Part number: 371574

Used in: IBM 7070


R: Load. Provides proper terminating impedance or optimum coupling of one circuit to another at the correct operating voltage level.

References: IBM Standard Modular System, Component Circuits, p179
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, 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.