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

Function of the card:
Cable Decouple Card
Cable de couple card
Cable De Couple Card

Listed in 1401 SMS card usage

Part number: 371533

Used in: IBM 1401, IBM 1410, IBM 7070


IBM SMS card type GK 371533 IBM SMS card type GK 371533

References: 1410_SMS_VOL_2.pdf, p88
Coslet data
National Museum of Computing.
IBM Standard Modular System, Component Circuits, p123
2_2 SMS Cards, p112
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.