Function of the card:
SDTDL data reg. and inhbt driver
SDTDL Data Register and Inhibit Driver
Part number: 372220
Customer Eng reference number: 734392
IBM 1443 ALD, p118
IBM 2821 CCD, p94
National Museum of Computing.
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.