Function of the card:
1-2 Way, 1-3 Way 2/Card (-A -O)
SDTDL 1-3, 1-2 way -a-o 2/card load
1-3 way 1-2 way-load
Part number: 372202
Customer Eng reference number: 734309
PCB number: 493457
Image courtesy of Roberto Gonzalez Rocha
National Museum of Computing.
IBM 2821 CCD, p24
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.