Function of the card:
Modem Number III A
Limited Distance Type 2A, Aux Receiver with Termination
Part number: 372826
Image courtesy of Nick Bletsch
References: General FE Handbook
National Museum of Computing.
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.