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

Function of the card:
Terminator Gated Without Loads
Driver Terminator
SDTRL - simplex interface terminator gated without loads
SDTRL-std cbl termntr gtd without ld

Quad Open Collector NAND Line Receiver

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

Part number: 370242

PCB number: 484069 , hole pattern: 493457

Used in: IBM 1620, IBM 1410, IBM 1414 I/O Synchronizer, IBM 1311 Disk, 7040

Symbol:DT

DT: Driver. Terminator. A single-transistor class-A grounded-base amplifier used to terminate a transmission line.

Pinout:

A O2
B O1
C O3
D I2T
E I3T
F I3
G GND
H I4T
J GND
K I2
L O4
M
N +12VM
P I1
Q I1T
R I4
References: IBM 1311 ILD, p117
Coslet data
1410_SMS_VOL_1.pdf, p57

This page created by Ken Shirriff on Wed Sep 15 18:15:09 2021.

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.