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

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

Used in: IBM 1443 Printer, IBM 2821 Control Unit

IBM SMS card type DJA 373329 IBM SMS card type DJA 373329

Image courtesy of Henk Stegeman

References: IBM 1443 ALD, pp107,108,109
National Museum of Computing.
IBM 2821 CCD, pp64,65,66
This page created by Ken Shirriff on Wed Sep 15 18:15:10 2021.

The information on these pages comes from a variety of sources, especially old IBM documents on, 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.