Function of the card:
Switch core matrix
Buffer matrix switch card
Buffer Matric Switch Card
Part number: 373329
Customer Eng reference number: 734415
PCB number: 483185 , hole pattern: 490251
Image courtesy of Henk Stegeman
National Museum of Computing.
IBM 2821 CCD, pp64,65,66
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.