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

Function of the card:

Listed in 1401 SMS card usage

Part number: 371680

Used in: IBM 729V

IBM SMS card type QH 371680 IBM SMS card type QH 371680

Image courtesy of Computer History Museum

This page created by Ken Shirriff on Wed Sep 15 18:15:10 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.