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

Function of the card:
Drift-3rd Level Logic, “P” Type

Part number: 370197

Used in: 7030

Cap code: DR (details)

IBM SMS card type SRDR 370197

Image courtesy of Computer History Museum
References: SMS Cap Code Templates & Index

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.