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

Function of the card:
SDTRL-Generator, Sample Pulse
SDTRL- generator, sample pulse

One Shot

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

Part number: 371874

Used in: IBM 1620

Cap code: None (details)

Symbol: DSP

DSP: Driver, Sample Pulse. Same as D, with the additional function of supplying a specific length pulse output when the input consists of a gate and a sample pulse spike. The input may also be the output of a current switching circuit without a gate.

Pinout:

A PDR
B CAP
C I1
D O1
E PDD
F
G
H
J GND
K
L
M -12V
N +12VM
P
Q
R
References: IBM 1620 Instructional System Diagrams, p495
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.