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

Function of the card:
Set/reset load
Set / Reset Load

Part number: 372223

Customer Eng reference number: 734395

Used in: IBM 1443 Printer, IBM 2821 Control Unit

IBM SMS card type YKU 372223 IBM SMS card type YKU 372223

References: IBM 2821 CCD, p97
National Museum of Computing.
IBM 1443 ALD, p121
This page created by Ken Shirriff on Wed Sep 15 18:15:11 2021.

The information on these pages comes from a variety of sources, especially old IBM documents on, 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.