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

Function of the card:
CTRL - Inverters "N" Type
Ctrl - inverters "n" type
CTRL-Inverter "N" Type
Ctrl-inverters n type
CTRL Three-Way PNP Non-Translating Circuits

Listed in 1401 SMS card usage
Triple 3 Input NAND

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

Part number: 371029

PCB number: 491149

Used in: IBM 1620, IBM 1410, 7030, IBM 729V, IBM 1414 I/O Synchronizer, 1622, 1626

Symbol:E, A, O, -O

-O: Negative OR. In-phase output is negative if one or more Input signals are negative. Outof-phase output is positive for the above condition.
IBM SMS card type CD 371029 IBM SMS card type CD 371029 IBM SMS card type CD 371029 IBM SMS card type CD 371029 IBM SMS card type CD 371029 IBM SMS card type CD 371029

Image courtesy of Henk Stegeman

Pinout:

A I1
B I1
C O2C
D O3
E O1
F I2
G I2
H I2
J GND
K I1
L O2R
M -12V
N +12VM
P I3
Q I3
R I3
References: Coslet data
1410_SMS_VOL_2.pdf, p55
IBM Standard Modular System, Component Circuits, p211
1626 Plotter Parts
National Museum of Computing.
IBM 1620 Instructional System Diagrams, p475
IBM 1620 FE Catalog

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 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.