Function of the card:
CTDL-Emitter Follower NPN
Emitter Follower NPN
Complemented Transistor Diode Logic (CTDL) is IBM's term for a form of diode-transistor logic.
Part number:371260
Field replacement part number:371260
Customer Eng reference number:729841
Used in:IBM 1401,IBM 7070,IBM 1410
Symbol:DE
DE: Driver Emitter Follower. A driver, operating on the emitter follower principle, used for power amplification, impedance matching, and isolation without inversion. Often used as a logical element.
Family: CTDL
IBM Standard Modular System, Component Circuits, p50.
1_2 SMS Cards, p103.
1410_SMS_VOL_1.pdf/1410_SMS_VOL_2.pdf, p2072.
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.