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

Function of the card:
Ctdl 3 way and pnp field replacement
Three-Way-AND (no loads)

CJ is listed in some sources with part number 371268, which corresponds to CJWF.

Complemented Transistor Diode Logic (CTDL) is IBM's term for a form of diode-transistor logic.

Field replacement part number: 370977

PCB number: 492301

Used in: IBM 1401, IBM 7070


-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 CJ IBM SMS card type CJ

Image courtesy of Henk Stegeman

References: IBM Standard Modular System, Component Circuits, p44
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.