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

Function of the card:
Overvoltage Protection 36 Volt

Crowbar

Part number: 370577

PCB number: 484339

Used in: IBM 1620

Cap code: None (details)

Symbol: OV

Pinout:

A NEG
B NEG
C NEG
D NEG
E NEG
F NEG
G NEG
H POS
J POS
K POS
L POS
M POS
N POS
P POS
Q
R BIAS
References: 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.