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

Function of the card:
Core Shift Register (Significant Digit Detection)

Part number: 371563

Used in: IBM 7070

Cap code: None (details)

Symbol: SR5

References: IBM Standard Modular System, Component Circuits, pp168,169

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.