Ref: 99980129
Title: IBC/M Arbitration PAL Rev. 01
Date: 6/25/87

Copyright 3Com Corporation, 1991.  All rights reserved.

Enclosed is an IBC/M Arbitration PAL Revision 01.  It should
replace the IBC/M Arbitration PAL Revision 00 on your IBC/M
board.

.h1;Installation Procedure

Follow these steps to install the IBC/M Arbitration PAL Revision
01:

1.  Use a small screwdriver or PROM-pulling tool to remove the
PAL Revision 00 from component position U35 on the IBC/M board.
Refer to Figure 1 for the location of U35.  Take note of the
orientation of this PAL, because the new PAL must be oriented in
the same direction.

2.  If the rows of prongs of the new PAL have been misshapen,
push the side of the PAL against a flat surface so that the
prongs are at right angles to the PAL body and fit easily into
the socket.

3.  Gently push the new PAL into the socket.  Be certain that no
prongs are bent under the body of the PAL.  Each prong must be
properly inserted into the socket.

4.  Change the revision number of the IBC/M board to "06".

.h1;New Features

Replacing the IBCM Arbitration PAL results in consistent
initialization of the RAM arbitration circuitry.  The IBC/M power-
up diagnostics now run properly.

If you have any questions, contact an authorized 3Com service
representative for assistance.
