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

Function of the card:
Alloy-Storage Address Register

Listed in 1401 SMS card usage

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

Part number: 373000

PCB number: 490051 , hole pattern: 490000

Used in: IBM 1401

IBM SMS card type ADB 373000 IBM SMS card type ADB 373000

Pinout:

A
B
C
D
E
F
G
H
J
K
L
M
N
P
Q
R

S
T
U
V
W
X
Y
Z
1 GND
2 -6V
3 +6V
4 -12V
5 +30V
6
7 +6VM
8 -12VM
References: Coslet data
1_2 SMS Cards, pp49,50,51,52,53,54,55,56

This page created by Ken Shirriff on Wed Sep 15 18:15:11 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.