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

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

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

Cap code: None (details)

Symbol: +O

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

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