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

Function of the card:
SDTRL-Driver, Relay Thyratron

Triple 2 Input NAND SCR Relay Driver

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

Part number: 372550

Cap code: None (details)

Symbol: DP

DP: Driver, Power. A power driver used to drive Into multiple bases.

Pinout:

A I1
B I1
C O1
D I2
E I2
F I3
G O3
H O2
J GND
K
L
M
N +12VM
P I3
Q
R
References: 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.