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

Function of the card:
SDTRL - Single Shot 0.15 Usec. to 65 Msec.
Single shot
SDTRL - single shot
SDTRL - Single Shot
SDTRL-sng shot 0.15 usec to 65 msec

Listed in 1401 SMS card usage
Open Collector Programmable Falling Edge Triggered One Shot w/ Pulldown

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

Part number: 370262

Customer Eng reference number: 729924

PCB number: 484089

Used in: IBM 1401, IBM 1410, IBM 1414 I/O Synchronizer, IBM 1311 Disk, IBM 1443 Printer, 1626

Symbol:SS

SS: Single Shot. Provides a monostable output which can be pulsed into its quasi-stable state for a predetermined duration. with each input triggering pulse or triggering voltage change. Once triggered, the output pulse duration becomes independent of input time duration or amplitude.
IBM SMS card type DHE 370262 IBM SMS card type DHE 370262 IBM SMS card type DHE 370262 IBM SMS card type DHE 370262 IBM SMS card type DHE 370262 IBM SMS card type DHE 370262 IBM SMS card type DHE 370262

Image courtesy of Roberto Gonzalez Rocha
Image courtesy of Nick Bletsch

Pinout:

A TC-0
B I1
C O1R
D TC-0.3US
E TC-3US
F TC-30US
G TC-C
H TC-0.3MS
J GND
K I1
L I1
M -12V
N +12VM
P O1C
Q TC-3MS
R TC-30MS
References: Coslet data
2_2 SMS Cards, pp99,100
1626 Plotter Parts
IBM 1311 ILD, p126
1410_SMS_VOL_1.pdf, p75
IBM 1443 ALD, p102

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 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.