COMCAST CORPORATION AND JONES INTERCABLE
                    ENTER INTO A DEFINITIVE MERGER AGREEMENT

Comcast to Own 100% of Jones Intercable, Inc.

Philadelphia,  PA - December 22, 1999...  Comcast  Corporation  (NASDAQ:  CMCSK,
CMCSA) and Jones Intercable, Inc. (NASDAQ: JOIN, JOINA) announced today that the
two companies have entered into a definitive  merger agreement whereby all Jones
shareholders  will  receive 1.4 shares of Comcast  Class A Special  Common Stock
(CMCSK)  for  each  share  of Jones  Intercable,  Inc.  (JOIN  and  JOINA).  The
transaction  will result in Jones  Intercable  being a 100% owned  subsidiary of
Comcast  Corporation  and is  expected  to be  tax-free  to Jones  shareholders.
Comcast had previously  announced its intention to make an offer to exchange 1.4
shares of CMCSK for each  Jones  Intercable  share up to 79% of the  outstanding
JOIN and JOINA shares.

A special  committee  of the  independent  directors of Jones  Intercable,  Inc.
considered  Comcast's  exchange  offer and  proposed  the merger to Comcast as a
transaction  that would be  substantially  more  attractive to Jones  Intercable
shareholders.  The special committee has unanimously approved the merger and has
received a fairness opinion from Donaldson,  Lufkin & Jenrette. In addition, the
Boards of Directors of Comcast and Jones  Intercable have  unanimously  approved
the merger. The merger is subject to a number of conditions including two-thirds
approval of each class of Jones  shares,  majority  approval of the Jones shares
not held by Comcast and approvals  from certain  regulatory  authorities.  Jones
Intercable  expects to hold the required  shareholder  meeting  during the first
quarter of 2000 and  anticipates  that the merger  will close  during the second
quarter of 2000.

This press release may contain forward-looking statements. Readers are cautioned
that such forward-looking  statements involve risks and uncertainties that could
significantly   affect  actual   results  from  those   expressed  in  any  such
forward-looking  statements.  Readers are directed to the note contained on page
one of Comcast's  Quarterly  Report and Jones  Intercable's  Quarterly Report on
Form 10-Q for a description of such risks and  uncertainties.

Jones Intercable,  Inc. is principally  involved in the development,  management
and operation of broadband cable networks. On April 7, 1999, Comcast Corporation
acquired a controlling interest in Jones Intercable,  Inc., and as of such date,
Jones Intercable is an indirect consolidated subsidiary of Comcast Corporation.

Jones  Intercable's  Common  Stock  and Class A Common  Stock are  traded on The
Nasdaq Stock Market under the symbols JOIN and JOINA, respectively.

Comcast Corporation  (www.comcast.com  [http://www.comcast.com] ) is principally
involved  in the  development,  management  and  operation  of  broadband  cable
networks and the provision of programming  content,  through principal ownership
of QVC,  Comcast-Spectacor  and Comcast SportsNet,  a controlling interest in E!
Entertainment Television and through other programming investments.

Comcast's  Class A Special  Common  Stock and Class A Common Stock are traded on
the Nasdaq Stock Market under the symbols CMCSK and CMCSA, respectively.

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