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

Function of the card:
CTDL + And Gate

Listed in 1401 SMS card usage

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

Part number: 371922

PCB number: 493213

Used in: IBM 1401

Symbol:+MA

IBM SMS card type CAC 371922 IBM SMS card type CAC 371922 IBM SMS card type CAC 371922 IBM SMS card type CAC 371922

Image courtesy of Henk Stegeman

References: Coslet data
1_2 SMS Cards, p74
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.