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

Function of the card:
Disk speed detector

Part number: 372296

PCB number: 399603

Used in: IBM 1311 Disk


References: Coslet data
IBM 1311 ILD, p100
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.