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

Function of the card:
1-6 way 1-4 way-load
1-6 Way, 1-4 Way W/Load (-A)
Sotol 1-6, 1-4 way -a w/load

Part number: 372195

Customer Eng reference number: 734304

PCB number: 484949 , hole pattern: 493457

Used in: IBM 1443 Printer, IBM 2821 Control Unit


-A: Negative AND. In-phase output is negative only when all inputs are negative. Out-of-phase output is positive for the above condition.
IBM SMS card type DEN 372195 IBM SMS card type DEN 372195

References: IBM 2821 CCD, p40
IBM 1443 ALD, p90
National Museum of Computing.
This page created by Ken Shirriff on Wed Sep 15 18:15:11 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.