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IBM Internal Use Only

Preface

The IBM Basic Counter Unit is referenced by Field

Engineering Publications as the IBM 2989 Model 11 Basic

Counter Unit. The type number, 2989 Model 11 is used by

the Field Engineering Division for installation and mainte

nance information recording.

IBM Basic Counter Unit Related Publications:

IBM Basic Counter Unit Probe Assignment Planning

Form, ZX22-6946

IBM Basic Counter Unit Patch Panel Planning Form,

ZX22-6952

IBM 2989 Model 11 Basic Counter Unit, FETOM,

ZY27-2236

IBM Systems Journal, Volume Eight, Number Four,

1969, G321-0019

IBM System/360 I/O Interface, Channel to Control Unit,

OEMI, GA22-6843

Introduction to IBM System/360 Direct Access Storage

Devices and Organization Methods, GC20-1649

IBM System/360 Principles o f Operation, GA22-6821

First Edition (February, 1970)

This edition contains information formerly in, and obsoletes, Form Y22-6934-0.

Changes are periodically made to the specifications herein; any such changes will

be reported in subsequent revisions.

Requests for copies of IBM publications should be made to your IBM

representative or to the IBM branch office servicing your locality.

This manual has been prepared by the IBM Systems Development Division,

Product Publications, Dept. B98, PO Box 390, Poughkeepsie, N.Y. 12602. A form

for readers’ comments is provided at the back of this publication. If the form has

been removed, comments may be sent to the above address.

IBM 360 User Manual

Questions and Answers: