This page describes the IBM SMS card "2JMX", and is part of the SMS card database.

Function of the card:
Ctdl npn two way gate w/ collector load
CTDL NPN Two Way Gate w/ Collector Load

Listed in 1401 SMS card usage

Complemented Transistor Diode Logic (CTDL) is IBM's term for a form of diode-transistor logic.

Part number: 370144

PCB number: 493339

Used in: IBM 1401, IBM 1410

Cap code: 2JMX (details)

Symbol:2+AO

IBM SMS card type 2JMX 370144 IBM SMS card type 2JMX 370144 IBM SMS card type 2JMX 370144 IBM SMS card type 2JMX 370144 IBM SMS card type 2JMX 370144 IBM SMS card type 2JMX 370144 IBM SMS card type 2JMX 370144 IBM SMS card type 2JMX 370144 IBM SMS card type 2JMX 370144

Image courtesy of Randall Neff
Image courtesy of Henk Stegeman

References: Coslet data
1410_SMS_VOL_1.pdf, p16
2_2 SMS Cards, p63
1401 Pocket Reference Manual
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.