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

Function of the card:
Control-Lock Circuit- Photosense
Control- lock circuit- photosense

Latch w/Emitter Follower Input

Part number: 371780

Used in: IBM 1620

Cap code: None (details)

Symbol: AM

AM: Amplifier. Provides increased strength to a detected signal or pulse.

Pinout:

A O1
B
C I1B
D I1E
E
F
G
H I1R
J GND
K
L
M -12V
N +12VM
P
Q
R
References: IBM 1620 Instructional System Diagrams, p489
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.