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

Function of the card:
Voltage sequencing card

Part number: 374792

PCB number: 396417

Used in: IBM 2821 Control Unit

Cap code: None (details)

IBM SMS card type JEB 374792 IBM SMS card type JEB 374792

Image courtesy of Henk Stegeman

References: IBM 2821 CCD, p90

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.