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

Function of the card:
CTRL Three-Way NPN Non-Translating Circuits
Ctrl - inverters "p" type

Complemented Transistor Resistor Logic (CTRL) is IBM's term for a form of resistor-transistor logic.

Part number: 371028

PCB number: 491149

Used in: IBM 1410, 7030


+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.
IBM SMS card type CC 371028 IBM SMS card type CC 371028 IBM SMS card type CC 371028 IBM SMS card type CC 371028

Image courtesy of Henk Stegeman

References: IBM Standard Modular System, Component Circuits, p210
1410_SMS_VOL_2.pdf, p54
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.