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

Function of the card:
Alloy - Reference to Ground Power Supply
Alloy reference to ground

Listed in 1401 SMS card usage
Voltage Regulator

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

Part number: 371656

PCB number: 492051

Used in: IBM 1620, IBM 1414 I/O Synchronizer, 1622, IBM 1401

IBM SMS card type QU 371656 IBM SMS card type QU 371656 IBM SMS card type QU 371656 IBM SMS card type QU 371656 IBM SMS card type QU 371656 IBM SMS card type QU 371656

Image courtesy of Henk Stegeman

Pinout:

A C
B POS
C OUT
D E
E REF
F EE
G CC
H ADJ
J D1A
K D1K
L D2A
M D2K
N FILTER
P
Q
R
References: Coslet data
National Museum of Computing.
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.