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

Part number: 374519

Cap code: None (details)

IBM SMS card type ZTR 374519 IBM SMS card type ZTR 374519

Image courtesy of Nick Bletsch

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.