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

Function of the card:
2-2 plus a, plus o. no load
2-2 way plus a plus o wo/load

Part number: 372241

Customer Eng reference number: 734323

PCB number: 484959 , hole pattern: 493457

Used in: IBM 1443 Printer, IBM 2821 Control Unit

Symbol:+O, +A

+O: Positive OR. In-phase output is positive if one or more input signals are positive. Out-of phase output is negative for the above condition.

+A: Positive AND. in-phase output is positive only when all inputs are positive. Out-of-phase output is negative for the above condition.

References: IBM 2821 CCD, p32
IBM 1443 ALD, p85
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.