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

Function of the card:
CTRL Three-Way PNP Translating Circuit
Ctrl - "n" type

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

Part number: 371027

Used in: IBM 1410, 7030, 1626


-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 CB 371027 IBM SMS card type CB 371027 IBM SMS card type CB 371027 IBM SMS card type CB 371027

References: IBM Standard Modular System, Component Circuits, p209
1410_SMS_VOL_2.pdf, p53
1626 Plotter Parts
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.