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

Function of the card:
SDTRL 9311 coax line driver-dispersed loads
SDTRL 93 ohm coax lire driver-dispersed loads
SDTRL 93ohm coax line driver-dispersed loads
SDTRL 93Ω Coax Line Driver-Dispersed Loads

Listed in 1401 SMS card usage
Quad Emitter Follower Line Driver

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

Part number: 370066

PCB number: 493279

Used in: IBM 1620, IBM 1311 Disk, IBM 1410, IBM 1401


DL: Driver, Line. Used to couple information between two widely separated points by means of coaxial line.
IBM SMS card type TAB 370066


A I4
B I2
C I3
D O4
E O2
F O3
G O1
H I1
M -12V
N +12VM
References: Coslet data
2_2 SMS Cards, p115
IBM 1311 ILD, p135
IBM 1620 Instructional System Diagrams, p491
1410_SMS_VOL_1.pdf, p4

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.