Function of the card:
SDTRL-Driver, Relay Thyratron
Triple 2 Input NAND SCR Relay Driver
Part number: 372550
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.