Function of the card:
Ctdl extender card field replacement
Part number: 370979
Field replacement part number: 370979
PCB number: 526999
Used in: IBM 1401
Image courtesy of Henk Stegeman
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.