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

Function of the card:
CTDL-Coupling Network
CM to CTDL Coupling Network

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

Part number:371256

Field replacement part number:371256

Customer Eng reference number:729840

Used in:IBM 1401,IBM 7070,IBM 1410

Symbol:R

R: Load. Provides proper terminating impedance or optimum coupling of one circuit to another at the correct operating voltage level.

Family: CTDL

References:
IBM Standard Modular System, Component Circuits, p49.
1_2 SMS Cards, p102.
1410_SMS_VOL_1.pdf/1410_SMS_VOL_2.pdf, p2070.
This page created by Ken Shirriff, 2015.

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. Images courtesy of Randall Neff. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.

Creation time: Tue Mar 03 23:40:33 2015.