Function of the card:
Gated 270mA Current Switch w/Emitter Follower
Part number: 371397
PCB number: 492947
Used in: IBM 1620
Image courtesy of Eric Schlaepfer
IBM 1620 Instructional System Diagrams, p483
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.