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

Function of the card:
122F N/C thermal card
Alloy-thermoswitch n/c 122f
7106/7107 Core Storage
Alloy-Thermoswitch N/C 122F
Alloy-thermoswitch n/c 122*f
Alloy-thermoswitch n/c 122 deg f

Overtemperature Switch

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

Part number: 371699

PCB number: 492955

Used in: IBM 1620, IBM 1414 I/O Synchronizer, IBM 1311 Disk, IBM 7090, 7040, 1622

Symbol:THER

IBM SMS card type RE 371699 IBM SMS card type RE 371699

Image courtesy of Eric Schlaepfer

Pinout:

A VO1
B VI1
C J1
D J1
E spare
F I1
G
H O1
J spare
K
L
M
N
P spare
Q spare
R spare
References: Coslet data
IBM 1311 ILD, p134
IBM 1620 Instructional System Diagrams, p490
Standard Module System Reference
IBM 1620 FE Catalog

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.