Ref: 99980136
Title: M3CURZ PROM Revision 02C
Date: 9/17/87

Copyright 3Com Corporation, 1991.  All rights reserved.

Enclosed are four M3CURZ PROMs to be installed on the SIO-3270
board in the Series/1 system.  This release memo describes the
procedure for installing the PROMs on the SIO-3270 board and the
new features of M3CURZ Revision 02C.

.h1;Installation

Follow these steps to install the M3CURZ PROMs:

1.  If the rows of pins are too far apart to fit into the
sockets, press them closer together by pushing one row of pins
against a flat surface.

2.  Locate the appropriate component positions (U47, U48, U49,
U50) on the SIO-3270 board.

3.  Remove the M2COAX Revision 01A PROMs in these component
positions.

4.  Gently push the M3CURZ PROMs into the sockets.  The marking
on each PROM indicates the position in which it should be placed.
Be sure that the notch in the PROM is oriented in the same
direction as the corresponding notch marked on the SIO-3270
board.

.h1;New Features

The following features, which were not present in M2COAX Revision
01A, have been implemented in M3CURZ Revision 02C:

1.  The clear key on the IBM 3270 display station now functions
correctly.

2.  IBM 3279 display stations now operate in base color.

3.  Personal computers equipped with IRMA cards can operate
correctly.

4.  The PF keys and the skip key on the 3270 display station
function correctly.

5.  When the host computer asks for device identification, the
terminal responds correctly.

6.  A terminal in XVT100 mode operates correctly when it is
connected to the CS/1-SNA.

7.  The uppercase "U" is displayed correctly.

8.  Field attributes on the 3270 display station now reset
correctly.

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