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

Function of the card:
Overvoltage, 3V

Mid-Pac power supply

Part number: 372677

Used in: IBM System/360

IBM SMS card type ZVR 372677 IBM SMS card type ZVR 372677

Image courtesy of rolyath

This page created by Ken Shirriff on Wed Sep 15 18:15:10 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.