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

Function of the card:
CTDL-High Speed One Way PNP One Load
T to U Converter (1 load)
High speed one way pnp one load

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

Part number:371578

Field replacement part number:370982

Customer Eng reference number:729865

Used in:IBM 1401,IBM 7070

Symbol:C

C: Converter. Used to translate from one voltage level to another, or to change the amplitude of the voltage swing about the same reference level.

Family: CTDL high speed

References:
IBM Standard Modular System, Component Circuits, p157.
1_2 SMS Cards, p39.
2_2 SMS Cards, p21.
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 23:40:34 2015.