This page describes the IBM SMS card "6JXD", and is part of the SMS card database.

Function of the card:
CTDL Standard Cable Driver

Listed in 1401 SMS card usage

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

Part number: 370089

PCB number: 493369

Used in: IBM 1401


IBM SMS card type 6JXD 370089 IBM SMS card type 6JXD 370089

References: 2_2 SMS Cards, pp66,67
Coslet data
This page created by Ken Shirriff on Wed Sep 15 18:15:11 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.