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

Function of the card:
Voltage Regulator #2
Voltage regulator #2

Part number: 372225

Customer Eng reference number: 734397

Used in: IBM 1443 Printer, IBM 2821 Control Unit

IBM SMS card type YKW 372225 IBM SMS card type YKW 372225

References: IBM 1443 ALD, p123
IBM 2821 CCD, p99
National Museum of Computing.
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.