Function of the card:
CTRL Three-Way NPN Non-Translating Circuits
Ctrl - inverters "p" type
Part number: 371028
PCB number: 491149
Used in: IBM 1410, 7030
Image courtesy of Henk Stegeman
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.