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

Function of the card:
Mup number 3
SDTRL mup number 3

Triple 3 Input AND w/ 1 inverted output

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

A Multiple-Use Package (MUP) card has circuits jumpered together directly on the card to form more complex circuits.

Part number: 370212

PCB number: 484019 , hole pattern: 490379

Used in: IBM 1620, IBM 1410, IBM 1414 I/O Synchronizer


IP: Inverter, Power. Performs function of an inverter white also driving a line.


A O3
B I2
C I2
D O2
E I1
F I1
G I3
H *O3
K I3
L I3
M -12V
N +12VM
P I2
Q I1
R O1
References: 1410_SMS_VOL_1.pdf, p29
Coslet data

This page created by Ken Shirriff on Wed Sep 15 18:15:11 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.