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

Function of the card:
CTDL-Logic Inverter PNP All Loads
CTDL Logic Inverter PNP All Loads
Ctdl logic inverter pnp no loads
CTDL Logic Inverter (PNP)
Ctdl logic inverter pnp all loads

Listed in 1401 SMS card usage

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

Part number: 371077

Used in: IBM 1401, IBM 1410, 7030, IBM 1414 I/O Synchronizer, IBM 7070

Cap code: VB (details)

Symbol:I

I: Inverter. Changes a positive input to a negative output, or vice versa.
IBM SMS card type JLVB 371077 IBM SMS card type JLVB 371077 IBM SMS card type JLVB 371077 IBM SMS card type JLVB 371077 IBM SMS card type JLVB 371077

Image courtesy of Randall Neff
Image courtesy of Henk Stegeman

References: Coslet data
2_2 SMS Cards, p35
1410_SMS_VOL_2.pdf, p63
National Museum of Computing.
IBM Standard Modular System, Component Circuits, p161
1401 Pocket Reference Manual
This page created by Ken Shirriff on Wed Sep 15 18:15:10 2021.

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