[DATA GENERAL LOGO]


PR Contact:  Ray Thomas                Investor Relations Contact:  David P. Roy
Data General Corp.                                            Data General Corp.
508/898-6545                                                        508/898-6544
ray_thomas@dg.com                                               David_Roy@dg.com




               DATA GENERAL - EMC STOCK EXCHANGE RATE ESTABLISHED


WESTBORO, Mass., October 4, 1999 - Data General Corporation said today that when
the company's merger with EMC Corporation is completed,  its  shareholders  will
receive  0.3125 shares of EMC common stock for each share of Data General common
stock they hold. The exchange ratio is based on the $68.97 average price for EMC
common stock during the 20-day trading period that ended October 1.
         Data  General  stockholders  will vote on whether to approve the merger
this  Thursday,  October  7, at a special  shareholders'  meeting  being held in
Boston. The two companies announced on August 9 that EMC planned to acquire Data
General. If Data General  shareholders  approve the merger, the acquisition will
be completed as soon as the requisite reviews by the United States Department of
Justice and the European Union have been concluded.
         EMC will  issue 16  million  shares  of  common  stock to Data  General
shareholders. In all, the transaction will be valued at $1.2 billion.
         Data General, based in Westboro,  Massachusetts, is a major supplier of
storage  and  enterprise  computing  solutions  for  customers  worldwide.   The
company's products include  CLARiiON(R) Fibre Channel storage systems,  high-end
Windows NT and UNIX(R) AViiON servers,  and related  software and services.  The
company reported fiscal 1998 revenues of $1.5 billion. Additional information on
the  company,  its  products,  and  services  is  available  on the  Internet at
www.dg.com .
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AViiON and CLARiiON are registered trademarks of Data General Corporation.