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

Function of the card:
CTRL Integrator Diode Input - Neg

Listed in 1401 SMS card usage

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

Part number: 371666

Used in: IBM 729V

Cap code: None (details)

IBM SMS card type NM 371666 IBM SMS card type NM 371666 IBM SMS card type NM 371666 IBM SMS card type NM 371666

Image courtesy of Henk Stegeman
Image courtesy of Roberto Gonzalez Rocha

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.