Function of the card:
CTDL- 3-Way “And” NPN
Three-Way +AND (2 loads)
Ctdl 3 way and npn all loads
Complemented Transistor Diode Logic (CTDL) is IBM's term for a form of diode-transistor logic.
Part number:371254
Field replacement part number:370978
Customer Eng reference number:729834
Symbol:+A
+A: Positive AND. in-phase output is positive only when all inputs are positive. Out-of-phase output is negative for the above condition.
Family: CTDL
IBM Standard Modular System, Component Circuits, p46.
1_2 SMS Cards, p34,96.
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.