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

Function of the card:
SDTRL-2Way Inverter
SDTRL-2way inverter

Quad 2 Input NAND

Saturated Drift Transistor Resistor Logic (SDTRL) is a form of resistor-transistor logic using faster drift-field transistors.

Part number: 371869

Used in: IBM 1620, 1622

Symbol:E, A, O


A I2
B I1
C O3
D I1
E I3
F I3
G O1
H I2
K O4
M -12V
N +12VM
Q I4
R I4
References: IBM 1620 FE Catalog
Coslet data
IBM 1620 Instructional System Diagrams, p490

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, 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.