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

Function of the card:
SDTRL-3 way inverter
SDTRL-3 Way Inverter

Triple 3 Input NAND

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

Part number: 371870

PCB number: 492909

Used in: 1622, IBM 1620

Cap code: None (details)

Symbol: E, A, O

Pinout:

A I1
B I1
C O2C
D O3
E O1
F I2
G I2
H I2
J GND
K I1
L O2R
M -12V
N +12VM
P I3
Q I3
R I3
References: IBM 1620 Instructional System Diagrams, p494
IBM 1620 FE Catalog
Coslet data

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.