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

Function of the card:
Alloy-Driver, 12V
Alloy-driver, 12v

Dual 300mA 12V Driver

Germanium alloy transistors were an early type of transistor, faster than the earlier grown-junction transistors.

Part number: 371881

PCB number: 493181

Used in: IBM 1620, 1622

Symbol:D

D: Driver. Isolates a signal from its generating source and uses it to drive one or more other circuits without affecting or overloading the generating circuits. Can be used to supply the required power directly or only to activate the circuit through which power is actually supplied.

Pinout:

A I1D
B I1R
C O1
D
E O2
F
G I2R
H I2D
J GND
K
L
M -12V
N
P
Q +12V
R
References: Coslet data
IBM 1620 Instructional System Diagrams, p497
IBM 1620 FE Catalog

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.