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
Part number: 371077
Used in: IBM 1401, IBM 1410, 7030, IBM 1414 I/O Synchronizer, IBM 7070
Cap code: VB (details)
I: Inverter. Changes a positive input to a negative output, or vice versa.
Image courtesy of Randall Neff
Image courtesy of Henk Stegeman
2_2 SMS Cards
National Museum of Computing.
IBM Standard Modular System, Component Circuits
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.