COMCAST CORP
424B2, 1995-05-18
CABLE & OTHER PAY TELEVISION SERVICES
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<PAGE>   1
                                                      Pursuant to Rule 424(b)2
                                           Registration Statement No. 33-50785

 
PROSPECTUS SUPPLEMENT
(To Prospectus dated January 27, 1994)
 
                                  $250,000,000
 
                              [COMCAST CORP. LOGO]
 
                 9 3/8% SENIOR SUBORDINATED DEBENTURES DUE 2005
 
                          ---------------------------
 
                    Interest Payable May 15 and November 15
 
                          ---------------------------
 
     The Debentures are not redeemable prior to May 15, 2000. After May 15,
2000, the Debentures are redeemable, in whole or in part, at the election of
Comcast Corporation (the "Company") at the redemption prices set forth herein
plus accrued interest to the date of redemption. See "Description of the
Debentures."
 
     SEE "CERTAIN CONSIDERATIONS" HEREIN AND IN THE ACCOMPANYING PROSPECTUS FOR
A DESCRIPTION OF CERTAIN FACTORS THAT SHOULD BE CONSIDERED BY PURCHASERS OF THE
DEBENTURES.
 
                          ---------------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
   SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
     PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS SUPPLEMENT OR
      THE PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
       OFFENSE.
 
                          ---------------------------
 
     The Underwriter has agreed to purchase the Debentures from the Company at
98.508% of their principal amount ($246,270,000 aggregate proceeds to the
Company, before deducting expenses payable by the Company estimated at
$100,000), plus accrued interest, if any, from May 23, 1995 to the date of
delivery, subject to the terms and conditions as set forth in the Underwriting
Agreement.
 
     The Underwriter proposes to offer the Debentures from time to time for sale
in one or more negotiated transactions, or otherwise, at market prices
prevailing at the time of sale, at prices related to such prevailing market
prices or at negotiated prices. For further information with respect to the plan
of distribution and any discounts, commissions or profits on resale that may be
deemed underwriting discounts or commissions, see "Underwriting" herein.
                          ---------------------------
 
     The Debentures offered by this Prospectus Supplement are offered by the
Underwriter subject to prior sale, withdrawal, cancellation or modification of
this offer without notice, to delivery to and acceptance by the Underwriter and
to certain further conditions. It is expected that delivery of the Debentures
will be made at the offices of Lehman Brothers Inc., New York, New York, on or
about May 23, 1995.
                          ---------------------------
                                LEHMAN BROTHERS
 
May 16, 1995
<PAGE>   2
 
                             CERTAIN CONSIDERATIONS
 
     Recent and Anticipated Losses; Increasing Stockholders' Deficiency.  In
recent years, the Company has experienced significant growth, principally
through acquisitions. The effect of these acquisitions on the Company's results
of operations has been and will be to significantly increase the Company's
revenues and expenses. In addition, the Company will continue to have
substantial losses for the foreseeable future as a result of additional
depreciation and amortization and interest expense resulting from these
acquisitions. Losses before extraordinary items and cumulative effect of
accounting changes in 1992, 1993, 1994 and for the three months ended March 31,
1994 and 1995 were $217,935,000, $98,871,000, $75,325,000, $15,777,000 and
$628,000, respectively. As a result of these losses and the effects of
extraordinary items and the cumulative effect of accounting changes, the Company
had a stockholders' deficiency at March 31, 1995 of $726,216,000. It is
anticipated that this stockholders' deficiency will increase in future periods.
It is not expected that the stockholders' deficiency will significantly affect
the way the Company does business or its ability to obtain financing.
 
     The Company realized operating income before depreciation and amortization
(commonly referred to in the Company's businesses as "operating cash flow") of
$397,153,000, $606,396,000, $576,256,000, $141,520,000 and $217,196,000 for the
years ended December 31, 1992, 1993, 1994 and for the three months ended March
31, 1994 and 1995, respectively. As a result of the Company's operating income
before depreciation and amortization, its existing cash balances, lines of
credit and other financing resources, the Company believes that it will meet its
current and long-term liquidity and capital requirements, including fixed
charges.
 
     Factors Affecting Future Operations.  The cable communications and cellular
telephone communications industries, as well as the Company's electronic
retailing operations, may be affected by, among other things, (i) changes in
government law and regulation, (ii) changes in the competitive environment,
(iii) changes in technology and (iv) market conditions that may adversely affect
the availability of debt and equity financing.
 
                                  THE COMPANY
 
     Comcast Corporation is engaged principally in the development, management
and operation of wired telecommunications including cable television and
telephone services; wireless telecommunications including cellular, personal
communications services and direct to home satellite television; and content
through its principal ownership of QVC, Inc. and other programming investments.
The Company's consolidated and affiliated operations serve over eight million
customers worldwide.
 
     The Company was organized in 1969 under the laws of the Commonwealth of
Pennsylvania and has its principal executive offices at 1500 Market Street,
Philadelphia, Pennsylvania, 19102-2148 (215-665-1700).
 
                                USE OF PROCEEDS
 
     The net proceeds to the Company from this offering are estimated to be
$246,170,000. The Company anticipates that the net proceeds will be used for
working capital and general corporate purposes, including the refinancing of
existing debt. The existing debt to be refinanced will be determined by
management. For the three months ended March 31, 1995, the weighted average
interest rate on the Company's indebtedness was approximately 8.25% per annum.
Pending such application of the proceeds, the Company will invest the proceeds
of this offering in certificates of deposit, United States governmental
securities or certain other interest-bearing securities.
 
                                       S-2
<PAGE>   3
 
                         DESCRIPTION OF THE DEBENTURES
 
     The following description of the Debentures offered hereby (referred to
herein as the "Debentures" and in the accompanying Prospectus as the "Offered
Debentures") supplements, and to the extent inconsistent therewith supersedes,
the description of the general terms and provisions of the Debentures and the
Offered Debentures set forth in the accompanying Prospectus, to which
description reference is hereby made.
 
     The Debentures are limited to $250,000,000 aggregate principal amount at
maturity. The Debentures will mature on May 15, 2005.
 
     The Debentures will bear interest from the date of issuance at a rate of
9 3/8% per annum, payable semi-annually on May 15 and November 15 of each year,
commencing November 15, 1995, to the person in whose name each Debenture was
registered at the close of business on the preceding May 1 and November 1
respectively, subject to certain exceptions. There is no provision for a sinking
fund.
 
     The Debentures contain no covenants or other provisions to afford
protection to holders of Debentures in the event of a highly leveraged
transaction or a change in control of the Company.
 
     The Debentures are not redeemable prior to May 15, 2000. After May 15,
2000, the Debentures are redeemable, in whole or in part, at the election of the
Company at the following respective percentages of the principal amount thereof
if redeemed during the twelve-month period beginning May 15 of the years
indicated, together, in each case, with interest accrued to the date fixed for
redemption:
 
<TABLE>
<CAPTION>
                                       YEAR                              PERCENTAGE
            -----------------------------------------------------------  -------
            <S>                                                          <C>
            2000.......................................................  104.688%
            2001.......................................................  102.344%
            2002 or thereafter.........................................  100.000%
</TABLE>
 
CONCERNING THE TRUSTEE
 
     Harris Trust and Savings Bank ("Harris Trust"), as successor trustee of
Morgan Guaranty Trust Company of New York, is the trustee under the Senior
Subordinated Indenture under which the Debentures offered hereby will be issued
and under which the Company's 10 1/4% Senior Subordinated Debentures Due 2001,
10 5/8% Senior Subordinated Debentures Due 2012 and 9 1/2% Senior Subordinated
Debentures Due 2008 have been issued. The Company has initially designated the
principal office of Bank of Montreal Trust Company, an affiliate of Harris
Trust, as registrar and paying agent under the Senior Subordinated Indenture.
 
                                  UNDERWRITING
 
     Under the terms and subject to the conditions contained in the Underwriting
Agreement dated as of May 16, 1995, Lehman Brothers Inc., as Underwriter, has
agreed with the Company to purchase from the Company the aggregate principal
amount of Debentures set forth on the cover page of this Prospectus Supplement.
 
     The Underwriting Agreement provides that the obligation of the Underwriter
to purchase the Debentures is subject to the approval of certain legal matters
by counsel and to certain other conditions set forth therein. The Underwriter is
obligated to take and pay for all the Debentures if any are taken.
 
     The Debentures are a new issue of securities with no established trading
market. The Company has been advised by the Underwriter that it intends to make
a market in the Debentures but that it is
 
                                       S-3
<PAGE>   4
 
not obligated to do so and it may discontinue market making at any time without
notice. No assurance can be given as to the liquidity of the trading market for
the Debentures.
 
     The distribution of the Debentures by the Underwriter is being effected
from time to time in negotiated transactions or otherwise at market prices
prevailing at the time of sale, at prices related to such prevailing market
prices or at negotiated prices. In connection with the sale of any Debentures,
the Underwriter may be deemed to have received compensation from the Company
equal to the difference between the amount received by the Underwriter upon the
sale of such Debentures and the price at which the Underwriter purchased such
Debentures from the Company. In addition, the Underwriter may sell Debentures to
or through certain dealers, and dealers may receive compensation in the form of
underwriting discounts, concessions or commissions from the Underwriter and/or
any purchasers of Debentures for whom they may act as agent (which compensation
may be in excess of customary commissions). The Underwriter may also receive
compensation from the purchasers of Debentures for whom it may act as agent.
 
     The Company has agreed to indemnify the Underwriter against and contribute
toward certain liabilities, including liabilities under the Securities Act of
1933, as amended.
 
                                    EXPERTS
 
     The financial statements and the related financial statement schedule of
the Company and subsidiaries as of December 31, 1994 and 1993 and for each of
the three years in the period ended December 31, 1994, included in the Annual
Report on Form 10-K of the Company and incorporated by reference in the
accompanying prospectus, have been audited by Deloitte & Touche LLP, independent
auditors, as stated in their report, which is incorporated herein by reference,
and have been so incorporated in reliance upon the report of such firm given
upon their authority as experts in accounting and auditing. The financial
statements of Storer Communications, Inc. for the year ended December 31, 1992,
incorporated by reference in the Annual Report on Form 10-K of the Company, has
been incorporated by reference therein in reliance upon the report of KPMG Peat
Marwick LLP, independent certified public accountants, incorporated by reference
in the accompanying prospectus, and upon the authority of said firm as experts
in accounting and auditing. The financial statements of QVC, Inc. (formerly, QVC
Network, Inc.) as of January 31, 1995 and 1994 and for each of the years in the
three year period ended January 31, 1995, included in the Current Report on Form
8-K of the Company filed on April 25, 1995 and incorporated by reference in the
accompanying prospectus, have been audited by KPMG Peat Marwick LLP, independent
certified public accountants, as indicated in their report with respect thereto
and have been so incorporated in reliance upon the authority of said firm as
experts in auditing and accounting. The financial statements for Comcast MHCP
Holdings, L.L.C. and subsidiaries as of December 31, 1994 and for the periods
from January 1, 1994 to December 21, 1994 and from December 22, 1994 to December
31, 1994, included in the Current Report on Form 8-K of the Company filed on
April 25, 1995 and incorporated by reference in the accompanying prospectus,
have been audited by Deloitte & Touche LLP, independent auditors, as stated in
their report, which is incorporated herein by reference, and have been so
incorporated in reliance upon the report of such firm given upon their authority
as experts in accounting and auditing. The financial statements for the
predecessor corporation to Comcast MHCP Holdings, L.L.C. and subsidiaries, being
the U.S. Cable Television Operations of Maclean Hunter, Inc., as of December 31,
1993 and for the years ended December 31, 1993 and 1992, included in the Current
Report on Form 8-K of the Company filed on April 25, 1995 and incorporated by
reference in the accompanying prospectus, have been audited by Ernst & Young,
Chartered Accountants, as indicated in their report, which is incorporated
herein by reference, and have been so incorporated in reliance upon their
authority as experts in accounting and auditing.
 
                                       S-4
<PAGE>   5
 
PROSPECTUS
 
                             [COMCAST CORP. LOGO]
 
               SENIOR DEBENTURES, SENIOR SUBORDINATED DEBENTURES,
    SUBORDINATED DEBENTURES, PREFERRED STOCK, CLASS A SPECIAL COMMON STOCK,
                       CLASS A COMMON STOCK AND WARRANTS
 
                         ------------------------------
 
    Comcast Corporation (the "Company") may offer and issue from time to time
(i) its senior debentures ("Senior Debentures"), senior subordinated debentures
("Senior Subordinated Debentures"), and subordinated debentures ("Subordinated
Debentures") (collectively, the "Debentures"), (ii) shares of its Preferred
Stock, no par value, which may be represented by depositary shares as described
herein (the "Preferred Stock"), (iii) shares of its Class A Special Common
Stock, par value $1.00 per share (the "Class A Special Common Stock"), (iv)
shares of its Class A Common Stock, par value $1.00 per share (the "Class A
Common Stock") or (v) Warrants to purchase Debentures, Preferred Stock, Class A
Special Common Stock or Class A Common Stock or other securities or rights (the
"Warrants"). The Debentures, Preferred Stock, Class A Special Common Stock,
Class A Common Stock and Warrants are herein collectively referred to as the
"Securities". The Securities may be offered in one or more separate classes or
series, in amounts, at prices and on terms to be determined by market conditions
at the time of sale and to be set forth in a supplement or supplements to this
Prospectus (a "Prospectus Supplement"). Any Securities may be offered with other
Securities or separately. Securities may be sold for U.S. dollars, foreign
currency or currency units; amounts payable with respect to any Securities may
likewise be payable in U.S. dollars, foreign currency or currency units -- in
each case, as the Company designates. Debentures and Preferred Stock may be
convertible and/or exchangeable for Securities or other securities or rights.
 
    Certain terms of any Debentures in respect of which this Prospectus is being
delivered will be set forth in the accompanying Prospectus Supplement including,
where applicable, the specific designation (including whether senior, senior
subordinated or subordinated and whether or not convertible and/or
exchangeable), aggregate principal amount, purchase price, maturity, interest
rate and time of payment of interest (if any), terms (if any) for the
redemption, conversion or exchange thereof, listing (if any) on a securities
exchange and any other specific terms of the Debentures. Certain terms of any
Preferred Stock in respect of which this Prospectus is being delivered will be
set forth in the accompanying Prospectus Supplement, including the specific
designation, number of shares, purchase price and the rights, preferences and
privileges thereof and any qualifications or restrictions thereon (including
dividends, liquidation value, voting rights, terms for the redemption,
conversion or exchange thereof and any other specific terms of the Preferred
Stock), listing (if any) on a securities exchange and whether the Company has
elected to offer the Preferred Stock in the form of depositary shares. Certain
terms of any Warrants in respect of which this Prospectus is being delivered
will be set forth in the accompanying Prospectus Supplement, including the
specific designation, the number, purchase price and terms thereof, any listing
of the Warrants or the underlying securities on a securities exchange and any
other terms in connection with the offering, sale and exercise of the Warrants,
as well as the terms on which and the securities for which such Warrants may be
exercised.
 
    See "Certain Considerations" for information that should be considered by
prospective investors.
 
    The Securities may be sold on a negotiated or competitive bid basis to or
through underwriters or dealers designated from time to time or to other
purchasers directly or through agents designated from time to time. Certain
terms of the offering and sale of the Securities, including, where applicable,
the names of the underwriters, dealers or agents, if any, the principal amount
or number of shares or Warrants to be purchased, the purchase price of the
Securities and the proceeds to the Company from such sale, and any applicable
commissions, discounts and other items constituting compensation of such
underwriters, dealers or agents, will also be set forth in the accompanying
Prospectus Supplement.
 
                         ------------------------------
 
   THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
    AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
          SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
            COMMISSION PASSED ON THE ACCURACY OR ADEQUACY OF THIS
              PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS
                             A CRIMINAL OFFENSE.
 
                         ------------------------------
 
                THE DATE OF THIS PROSPECTUS IS JANUARY 27, 1994
<PAGE>   6
 
     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS, IF ANY, MAY OVER-ALLOT
OR EFFECT TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICES OF THE
SECURITIES AT LEVELS ABOVE THOSE WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN
MARKET. SUCH TRANSACTIONS MAY BE EFFECTED IN THE OVER-THE-COUNTER MARKET OR
OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.

                         ------------------------------
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The Company incorporates by reference the following documents heretofore
filed with the Securities and Exchange Commission (the "Commission") pursuant to
the Securities Exchange Act of 1934, as amended (the "Exchange Act"):
 
        1. Annual Report of the Company on Form 10-K for the fiscal year ended
           December 31, 1992, including Exhibit 28(1) thereto.
 
        2. Quarterly Reports of the Company on Form 10-Q for the quarters ended
           March 31, 1993, June 30, 1993 and September 30, 1993.
 
        3. Current Reports of the Company on Form 8-K filed on January 15, 1993,
           September 15, 1993 and November 15, 1993.
 
        4. Description of the Company's Class A Special Common Stock contained
           in a Registration Statement of the Company on Form 8-A dated November
           4, 1986.
 
        5. Description of the Company's Class A Common Stock contained in a
           Registration Statement of the Company on Form 8-A dated April 14,
           1973.
 
     All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act after the date of this Prospectus and prior to the
termination of the offering hereby shall be deemed to be incorporated by
reference in this Prospectus and to be a part hereof from the date of filing
such documents. Any statement contained herein or in a document incorporated by
reference herein shall be deemed to be modified or superseded for purposes
hereof to the extent that a statement contained herein or in a supplement or
amendment hereto (or in any subsequently filed document which also is
incorporated by reference herein) modifies or supersedes such statement. Any
statement so modified or superseded shall not be deemed to constitute a part
hereof except as so modified or superseded.
 
     The Company will provide without charge to each person, including any
beneficial owner, to whom a Prospectus is delivered, on the written or oral
request of any such person, a copy of any or all of the documents incorporated
herein by reference, other than exhibits to such documents unless specifically
incorporated by reference into the information that the prospectus incorporates.
Such written requests should be addressed as follows:
 
                   Comcast Corporation
                   1234 Market Street
                   Philadelphia, Pennsylvania 19107-3723
                   Attention: John R. Alchin, Senior Vice President and
                             Treasurer
 
                                        2
<PAGE>   7
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the informational requirements of the Exchange
Act and in accordance therewith files reports, proxy and information statements
and other information with the Commission. Such reports, proxy and information
statements and other information can be inspected and copied at the public
reference facilities maintained by the Commission at Room 1024, 450 Fifth
Street, N.W., Washington, D.C. 20549, and at the Commission's Regional Offices
located at Suite 1400, 500 West Madison Street, Chicago, Illinois 60661 and 7
World Trade Center, New York, New York 10048, and copies of such materials can
be obtained from the Public Reference Section of the Commission, Washington,
D.C. 20549, at prescribed rates.
 
     This Prospectus constitutes a part of a Registration Statement on Form S-3
(the "Registration Statement") filed by the Company with the Commission under
the Securities Act of 1933 (the "Securities Act"). This Prospectus omits certain
of the information contained in the Registration Statement in accordance with
the rules and regulations of the Commission. Reference is hereby made to the
Registration Statement and related exhibits for further information with respect
to the Company and the Securities. Statements contained herein concerning the
provisions of any document are not necessarily complete and, in each instance,
reference is made to the copy of such document filed as an exhibit to the
Registration Statement or otherwise filed with the Commission. Each such
statement is qualified in its entirety by such reference.

                            ------------------------
 
     NO DEALER, SALESMAN OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED OR
INCORPORATED BY REFERENCE IN THIS PROSPECTUS IN CONNECTION WITH THE OFFERING
DESCRIBED HEREIN, AND IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST
NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY OR ANY OTHER PERSON.
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN
OFFER TO BUY, ANY SECURITIES OTHER THAN THOSE SPECIFICALLY OFFERED HEREBY OR ANY
SECURITIES OFFERED HEREBY IN ANY JURISDICTION TO ANY PERSON TO WHOM IT IS
UNLAWFUL TO MAKE AN OFFER OR SOLICITATION IN SUCH JURISDICTION. NEITHER THE
DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THE INFORMATION HEREIN IS CORRECT AS
OF ANY TIME SUBSEQUENT TO ITS DATE.
 
                                        3
<PAGE>   8
 
                                  THE COMPANY
 
     The Company is principally engaged in the development, management and
operation of cable and cellular communications systems. The Company's
consolidated and affiliated cable operations served more than 2,645,000
subscribers and passed approximately 4,280,000 homes at September 30, 1993. In
addition, the Company owns 19.9% of Heritage Communications, Inc., a cable
communications company serving approximately 1,000,000 subscribers and passing
approximately 1,700,000 homes, and 40% of Garden State Cablevision L.P. ("Garden
State"), a cable communications company serving approximately 190,000
subscribers and passing approximately 283,000 homes. The Company operates
cellular telephone systems pursuant to licenses granted by the Federal
Communications Commission ("FCC") for geographic markets in portions of
Pennsylvania, New Jersey, Delaware and Illinois. The portion of the total
population in the localities served by these cellular systems attributable to
the Company's ownership interests is approximately 7,400,000 (based upon the
1993 Rand McNally Commercial Atlas and Marketing Guide).
 
     The Company, organized in 1969 under the laws of the Commonwealth of
Pennsylvania, has its principal executive offices at 1234 Market Street,
Philadelphia, Pennsylvania, 19107-3723 (215-665-1700).
 
                             CERTAIN CONSIDERATIONS
 
     Recent and Anticipated Losses; Increasing Negative Book Value.  In recent
years, the Company has experienced significant growth, principally through
acquisitions. The effect of these acquisitions on the Company's results of
operations has been and will be to increase significantly the Company's service
income and expenses and is expected to result in substantial losses for the
foreseeable future. Losses before extraordinary items and the cumulative effect
of accounting changes in 1990, 1991 and 1992 and for the nine months ended
September 30, 1992 and 1993, were $178,406,000, $155,572,000, $217,935,000,
$129,307,000 and $76,640,000, respectively. As a result of these losses and the
effects of extraordinary items and the cumulative effect of accounting changes,
the Company had a negative book value at September 30, 1993 of $853,008,000. It
is anticipated that this negative book value will increase in future periods. It
is not expected that the negative book value will significantly affect the way
that the Company does business or its ability to obtain financing.
 
     The Company realized operating income before depreciation and amortization
(generally referred to in the Company's industries as "operating cash flow") of
$271,167,000, $309,250,000, $397,153,000, $282,936,000 and $460,246,000 for the
years ended December 31, 1990, 1991 and 1992, and for the nine months ended
September 30, 1992 and 1993, respectively. As a result of the Company's
operating income before depreciation and amortization, its existing cash
balances, lines of credit and other financing resources, the Company believes
that it will meet its current and long-term liquidity and capital requirements,
including meeting its fixed charges.
 
     Factors Affecting Future Operations.  The cable communications and cellular
telephone industries, as well as the Company's future operations, may be
affected by, among other things, (i) changes in government law and regulation,
(ii) changes in the competitive environment generally, (iii) changes in
technology, and (iv) market conditions that may adversely affect the
availability of debt and equity financing.
 
                                USE OF PROCEEDS
 
     Except as may otherwise be set forth in the Prospectus Supplement, the net
proceeds from the sale of the Securities offered hereby will be used for working
capital and general corporate purposes. Pending such application of the
proceeds, the Company will invest the proceeds of this offering in certificates
of deposit, United States government securities or certain other interest
bearing securities.
 
                                        4
<PAGE>   9
 
                                DIVIDEND POLICY
 
     The Company began paying quarterly dividends on its Class A Common Stock in
1977. Since 1978, the Company has paid equal dividends on both the Class A
Common Stock and the Class B Common Stock. Since December 1986, when the Class A
Special Common Stock was issued, the Company has paid equal dividends on shares
of all classes of its Common Stock. Since 1991, the Company has paid dividends
aggregating $.14 per year per share of its Class A, Class A Special and Class B
Common Stocks.
 
     It is the intention of the Board of Directors to continue to pay regular
quarterly dividends on shares of all classes of its Common Stock; however, the
declaration and payment of future dividends on the Common Stock and any
preferred stock subsequently issued and their amounts will be determined by the
Board of Directors from time to time based upon the earnings, financial
condition and capital needs of the Company and other factors.
 
                  RATIO OF EARNINGS TO COMBINED FIXED CHARGES
                         AND PREFERRED STOCK DIVIDENDS
 
     The following table sets forth the Company's historical ratio of earnings
to combined fixed charges and preferred stock dividends (1):
 
<TABLE>
<CAPTION>
                                                                             NINE MONTHS ENDED SEPTEMBER
                                       YEAR ENDED DECEMBER 31,                           30,
                               ----------------------------------------     -----------------------------
                               1988     1989     1990     1991     1992         1992            1993
                               ----     ----     ----     ----     ----     -------------   -------------
<S>                            <C>      <C>      <C>      <C>      <C>      <C>             <C>
Ratio of earnings to
  combined fixed charges and
  preferred stock dividends
  (2).......................     --(3)    --(3)    --(3)    --(3)    --(3)      --(3)           --(3)
</TABLE>
 
- ------------------
(1) The Company currently has no shares of preferred stock outstanding.
 
(2) For the purposes of calculating the ratio of earnings to combined fixed
    charges and preferred stock dividends, earnings consist of net earnings
    before income taxes, extraordinary items, cumulative effect of accounting
    changes, equity in net losses of affiliates and fixed charges. Fixed charges
    consist of interest expense, preferred stock dividend requirements of a
    subsidiary to an affiliate and capitalized interest.
 
(3) Earnings as defined in Note 2 were inadequate to cover combined fixed
    charges and preferred stock dividends for these periods. The amount of the
    coverage deficiency was $33,887,000, $75,454,000, $103,292,000, $59,408,000
    and $99,629,000 for the years ended December 31, 1988, 1989, 1990, 1991 and
    1992, respectively, and $62,265,000 and $41,812,000 for the nine months
    ended September 30, 1992 and 1993, respectively.
 
                                        5
<PAGE>   10
 
                           DESCRIPTION OF DEBENTURES
 
     The Company may offer under this Prospectus Senior Debentures, Senior
Subordinated Debentures and Subordinated Debentures, any of which Debentures may
be issued as convertible and/or exchangeable Debentures.
 
     The Debentures will represent unsecured general obligations of the Company,
unless otherwise provided in the Prospectus Supplement. The Senior Debentures
will be senior to all subordinated indebtedness of the Company, and pari passu
with other unsecured, unsubordinated indebtedness of the Company. The Senior
Subordinated Debentures will be subordinate in right of payment to the Senior
Debentures and to certain other debt obligations of the Company, pari passu with
certain other senior subordinated indebtedness of the Company and senior to
certain subordinated indebtedness of the Company. The Subordinated Debentures
will be subordinate in right of payment to the Senior Debentures, the Senior
Subordinated Debentures and to certain other debt obligations of the Company and
pari passu with certain other subordinated indebtedness of the Company.
 
     Substantially all of the Company's operations are conducted through
subsidiaries and any right of the Company to receive assets of any of its
subsidiaries upon liquidation or recapitalization of any such subsidiaries (and
the consequent right of the Debentureholders to participate in those assets)
will be subject to the claims of such subsidiaries' creditors. Even in the event
that the Company is recognized as a creditor of a subsidiary, the Company's
claims would still be subject to any security interest in the assets of such
subsidiary and any indebtedness of such subsidiary senior to that of the
Company. The Company's ability to service its indebtedness, including the
Debentures, is dependent primarily upon the receipt of funds from its
subsidiaries. The subsidiaries are separate legal entities and have no
obligation to pay any amounts due pursuant to the Debentures. Certain legal,
contractual and business considerations limit the Company's ability to receive
funds from its subsidiaries in the form of loans, dividends, management fees or
otherwise.
 
     The Senior Debentures will be issued under an Indenture to be executed by
the Company and Morgan Guaranty Trust Company of New York, as Trustee (the
"Senior Indenture"); the Senior Subordinated Debentures will be issued under an
Indenture between the Company and Morgan Guaranty Trust Company of New York, as
Trustee (the "Senior Subordinated Indenture") dated as of October 17, 1991 as
amended; and the Subordinated Debentures will be issued under an Indenture
between the Company and Bankers Trust Company, as Trustee (the "Subordinated
Indenture") dated as of February 20, 1991 as amended. In this Prospectus, the
Senior Indenture, the Senior Subordinated Indenture and the Subordinated
Indenture are sometimes collectively referred to as the Indentures and the
Trustee under the Senior Indenture, the Trustee under the Senior Subordinated
Indenture and the Trustee under the Subordinated Indenture are sometimes
collectively referred to as the Trustees and individually as a Trustee. The
following summary of certain provisions of the Indentures does not purport to be
complete and is subject to, and qualified in its entirety by, reference to all
the provisions of the Indentures, including the definitions therein of certain
terms. Wherever particular sections or defined terms of the Indentures are
referred to, it is intended that such sections or defined terms shall be
incorporated herein by reference. As used in the Indentures and in this section,
the term the "Company" means Comcast Corporation without reference to its
consolidated subsidiaries.
 
GENERAL
 
     The Indentures do not limit the aggregate principal amount of Debentures
which may be issued thereunder and provide that Debentures may be issued in one
or more series, in such form or forms, with such terms and up to the aggregate
principal amount authorized from time to time by the Company. (Sections 2.1; 2.2
of the Indentures). Unless otherwise provided in the Prospectus Supplement, the
Debentures may be presented for registration of transfer and exchange and for
payment or, if applicable, for conversion and/or exchange at the office of the
applicable Trustee, unless the Company appoints a different office or agency for
such purpose. (Section 4.2 of the Indentures). At the option of the Company, the
payment of interest may also be made by check mailed
 
                                        6
<PAGE>   11
 
to the address of the person entitled thereto as it appears in the Debenture
register. (Section 4.1 of the Indentures).
 
     The applicable Prospectus Supplement will describe the following terms of
any Debentures (the "Offered Debentures") in respect of which this Prospectus is
being delivered (to the extent applicable to the Offered Debentures): (1) the
designation (including whether they are Senior Debentures, Senior Subordinated
Debentures or Subordinated Debentures and whether such Debentures are
convertible and/or exchangeable), aggregate principal amount and authorized
denominations, if other than denominations of $1,000 and any integral multiple
thereof, of the Offered Debentures; (2) the percentage of the principal amount
at which such Offered Debentures will be issued; (3) the date or dates (and
whether fixed or extendable) on which the principal of the Offered Debentures is
payable or the method of determination thereof; (4) the rate or rates at which
the Offered Debentures will bear interest, if any, the method of calculating
such rates, the date or dates from which such interest will accrue, the interest
payment dates on which such interest shall be payable and the record dates for
the determination of Debentureholders to whom interest will be payable; (5) the
place or places where the principal of, premium, if any, and interest, if any,
on the Offered Debentures will be payable; (6) any provisions relating to the
issuance of the Offered Debentures at an original issue discount; (7) the price
or prices at which, the period or periods within which, and the terms and
conditions upon which the Offered Debentures may be redeemed, in whole or in
part, at the option of the Company, pursuant to any sinking fund or otherwise
(including the form or method of payment if other than in cash, which may
include securities of other issuers); (8) the obligation, if any, of the Company
to redeem, repay or purchase the Offered Debentures pursuant to any mandatory
redemption, sinking fund or analogous provisions or at the option of the
Debentureholder and the price or prices at which, the period or periods within
which and the terms and conditions upon which the Offered Debentures will be
redeemed, repaid or purchased, in whole or in part, pursuant to any such
obligation (including the form or method of payment if other than in cash, which
may include securities of other issuers), and any provisions for the remarketing
of such Debentures; (9) if other than the principal amount thereof, the portion
of the principal amount of the Offered Debentures which will be payable upon
declaration of acceleration of the maturity thereof or provable in bankruptcy;
(10) any Events of Default in addition to or in lieu of those described herein
and remedies therefor; (11) whether the Offered Debentures are convertible or
exchangeable and, if so, the securities or rights into which the Offered
Debentures are convertible or exchangeable (which may include other Debentures,
Preferred Stock, Class A Common Stock, Class A Special Common Stock or other
securities or rights of the Company (including rights to receive payment in cash
or securities based on the value, rate or price of one or more specified
commodities, currencies or indices) or exchangeable for securities of other
issuers or a combination of the foregoing) and the terms and conditions upon
which such conversion or exchange will be effected including the initial
conversion or exchange price or rate, the conversion or exchange period and any
other provision in addition to or in lieu of those described herein; (12) any
trustees, authenticating or paying agents, transfer agents or registrars or any
other agents with respect to the Offered Debentures; (13) the currency or
currencies, including composite currencies, in which the Offered Debentures will
be denominated if other than the currency of the United States of America; (14)
if other than the coin or currency in which the Offered Debentures are
denominated, the coin or currency in which payment of the principal of, premium,
if any, or interest on the Offered Debentures will be payable; (15) if the
principal of, premium, if any, or interest on the Offered Debentures are to be
payable, at the election of the Company or a holder thereof, in a coin or
currency other than that in which the Offered Debentures are denominated, the
period or periods within which, and terms and conditions upon which, such
election may be made; (16) if the amount of payments of principal of, premium,
if any, and interest on the Offered Debentures may be determined with reference
to the value, rate or price of one or more specified commodities, currencies or
indices, the manner in which such amounts shall be determined; (17) whether and
under what circumstances the Company will pay additional amounts on the Offered
Debentures held by a person who is not a United States of America person in
respect of any tax, assessment or governmental charge withheld or deducted and,
if so, whether the Company will have the option to redeem such Debentures rather
than pay such additional amounts; (18) if receipt of
 
                                        7
<PAGE>   12
 
certain certificates or other documents or satisfaction of other conditions will
be necessary for any purpose, including, without limitation, as a condition to
the issuance of the Offered Debentures in definitive form (whether upon original
issue or upon exchange of a temporary Debenture), the form and terms of such
certificates, documents or conditions; (19) any other affirmative or negative
covenants with respect to the Offered Debentures; (20) whether the Offered
Debentures will be issued in whole or in part in the form of one or more Global
Debentures and, in such case, the Depositary therefor and the circumstances
under which any Global Debenture may be exchanged for Offered Debentures
registered in the name of, and under which any transfer of such Global Debenture
may be registered in the name of, any person other than the Depositary; and (21)
any other specific terms of the Offered Debentures. (Section 2.2 of the
Indentures).
 
     The Debentures will be exchangeable or transferable without charge
therefor, but the Company may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith. (Sections 2.6;
2.10 of the Indentures).
 
     Debentures may be issued and sold at a substantial discount below their
principal amount or their redemption value. (Section 2.2 of the Indentures). If
so issued, special federal income tax and other considerations applicable
thereto, other than those described herein, will be described in the Prospectus
Supplement relating thereto.
 
SUBORDINATION
 
     The Subordinated Debentures will be subordinated and subject, to the extent
and in the manner set forth in the Subordinated Indenture, in right of payment
to the prior payment in full of all Senior Indebtedness as defined in the
Subordinated Indenture. (Section 3.1 of the Subordinated Indenture). Senior
Indebtedness is defined in the Subordinated Indenture as (a) the principal of
and premium, if any, and interest on: (i) all indebtedness for money borrowed by
the Company, whether outstanding on the date of the Indenture or thereafter
created or incurred (other than the indebtedness with which the Subordinated
Debentures will be pari passu, as described below); (ii) all indebtedness for
money borrowed by another person, in which the Company has an equity interest or
has the right to purchase an equity interest, and guaranteed directly or
indirectly by the Company (whether such guarantee is outstanding on the date of
the Indenture or thereafter created or incurred); and (iii) all indebtedness
constituting purchase money indebtedness (as defined) for the payment of which
the Company is directly or contingently liable (whether outstanding on the date
of the Indenture or thereafter created or incurred); (b) any obligation to
purchase or guarantee indebtedness of, to supply funds to or invest in, another
person in which the Company has an equity interest or has the right to purchase
an equity interest (whether such obligation is outstanding on the date of the
Indenture or is thereafter created or incurred); (c) any obligation of the
Company to any person in respect of surety or similar bonds issued by such
person in connection with entering into, renewing or extending any cable
television franchise granted by a governmental authority or any construction in
respect of any cable television system by the Company or any other person in
which the Company has an equity interest or has the right to purchase an equity
interest; and (d) all renewals, extensions or refundings of any such
obligations, indebtedness and guarantees; provided, however, that Senior
Indebtedness shall not include (i) indebtedness with which the Subordinated
Debentures will rank pari passu (as described below); or (ii) any obligation,
indebtedness or guarantee which is created or evidenced by an instrument the
terms of which expressly provide that such obligation, indebtedness or guarantee
is subordinate to all other indebtedness of the Company or is not superior in
right of payment or performance to the Subordinated Debentures, or that such
obligation, indebtedness or guarantee is subordinate to senior indebtedness and
senior indebtedness is defined in such instrument in substantially the same
manner as senior indebtedness is defined in the indentures for the 7%
Convertible Subordinated Debentures Due 2014 and the Zero Coupon Convertible
Subordinated Notes Due 1995, unless the definition of senior indebtedness
expressly provides that such obligation, indebtedness or guarantee is not
subordinate to the Subordinated Debentures or is superior in right of payment or
performance to the Subordinated Debentures. (Section 1.1 of the Subordinated
Indenture). As of September 30, 1993, there were no 7% Convertible Subordinated
Debentures Due 2014 outstanding.
 
                                        8
<PAGE>   13
 
     The Senior Subordinated Debentures will be subordinated and subject, to the
extent and in the manner set forth in the Senior Subordinated Indenture, in
right of payment to the prior payment in full of all Senior Indebtedness as
defined in the Senior Subordinated Indenture. (Section 3.1 of the Senior
Subordinated Indenture). Senior Indebtedness is defined in the Senior
Subordinated Indenture in the same manner as Senior Indebtedness is defined in
the Subordinated Indenture except that Senior Indebtedness as defined in the
Senior Subordinated Indenture does not include: (i) indebtedness with which the
Senior Subordinated Debentures will rank pari passu (as described below); or
(ii) any obligation, indebtedness or guarantee which is created or evidenced by
an instrument the terms of which expressly provide that such obligation,
indebtedness or guarantee is subordinate to all other indebtedness of the
Company or is not superior in right of payment or performance to the Senior
Subordinated Debentures or that such obligation, indebtedness or guarantee is
subordinate to senior indebtedness and senior indebtedness is defined in such
instrument in substantially the same manner as senior indebtedness is defined in
the indentures for the 11 7/8% Senior Subordinated Debentures Due 2004, the
11 3/4% Senior Subordinated Debentures Due 2006, the 7% Convertible Subordinated
Debentures Due 2014, the 2 3/4% Convertible Subordinated Debentures due 2003 and
the Zero Coupon Convertible Subordinated Notes Due 1995, unless the definition
of senior indebtedness expressly provides that such obligation, indebtedness or
guarantee is not subordinate to the Senior Subordinated Debentures or is
superior in right of payment or performance to the Senior Subordinated
Debentures. (Section 1.1 of the Senior Subordinated Indenture). As of September
30, 1993, there were no 11 3/4% Senior Subordinated Debentures Due 2006, 7%
Convertible Subordinated Debentures Due 2014 or 2 3/4% Convertible Subordinated
Debentures Due 2003 outstanding.
 
     The Senior Subordinated Debentures shall rank pari passu with the 11 7/8%
Senior Subordinated Debentures Due 2004, the 10 1/4% Senior Subordinated
Debentures Due 2001, the 10 5/8% Senior Subordinated Debentures Due 2012 and the
9 1/2% Senior Subordinated Debentures Due 2008. The Subordinated Debentures
shall rank pari passu with the 7% Convertible Subordinated Debentures Due 2001,
the Zero Coupon Convertible Subordinated Notes Due 1995, the 3 3/8%/5 1/2%
Step-up Convertible Subordinated Debentures Due 2005 and the 1 1/8% Discount
Convertible Subordinated Debentures Due 2007.
 
     At September 30, 1993, and as adjusted to account for the subsequent
issuance of the 1 1/8% Discount Convertible Subordinated Debentures Due 2007,
the Company had approximately $4.8 billion of Senior Indebtedness and other
indebtedness to which the Subordinated Debentures may be effectively
subordinated and approximately $4.0 billion of Senior Indebtedness and other
indebtedness to which the Senior Subordinated Debentures may be effectively
subordinated. There is no limitation in the Indentures on the incurrence of
additional Senior Indebtedness.
 
     No payment on account of the principal of, premium, if any, or interest on
the Senior Subordinated Debentures or Subordinated Debentures may be made, if,
at the time of such payment or immediately after giving effect thereto, there
exists a default in payment of the principal of, premium, if any, or interest on
any Senior Indebtedness (as defined in the Senior Subordinated Indenture or
Subordinated Indenture, as applicable), whether at expressed maturity,
acceleration thereof or otherwise, except as otherwise provided in the
applicable Indenture. (Section 3.2 of the Senior Subordinated and Subordinated
Indentures). Upon any payment or distribution of assets of the Company of any
kind or character, upon any dissolution or winding up or total or partial
liquidation or reorganization of the Company, whether voluntary or involuntary,
in bankruptcy, insolvency or receivership, or upon an assignment for the benefit
of creditors or any other marshalling of the assets and liabilities of the
Company or otherwise, all principal of, premium, if any, and interest due on all
Senior Indebtedness (including any outstanding Senior Debentures and, in the
case of the Subordinated Debentures, any outstanding Senior Subordinated
Indebtedness) must be paid or provided for in full before the holders of the
Senior Subordinated or Subordinated Debentures are entitled to receive or retain
any payment (Section 3.2 of the Senior Subordinated and Subordinated
Indentures). Subject to the payment in full of all Senior Indebtedness (as
defined in the Senior Subordinated Indenture or the Subordinated Indenture, as
the case may be), the holders of the Senior Subordinated Debentures or
Subordinated Debentures, as applicable, will be subrogated to the rights of the
holders of Senior
 
                                        9
<PAGE>   14
 
Indebtedness (as respectively defined) to receive payments or distributions of
assets of the Company applicable to Senior Indebtedness until the Senior
Subordinated or Subordinated Debentures are paid in full. (Section 3.2 of the
Senior Subordinated and Subordinated Indentures). By reason of such
subordination, in the event of a distribution of assets upon insolvency, certain
general creditors of the Company may recover more, ratably, than the holders of
the Senior Subordinated or Subordinated Debentures.
 
CONVERTIBLE DEBENTURES
 
     The terms, if any, on which Offered Debentures may be (mandatorily or
otherwise) exchanged for or converted into other Debentures or shares of
Preferred Stock, Class A Common Stock or Class A Special Common Stock or other
securities or rights of the Company (including rights to receive payments in
cash or securities based on the value, rate or price of one or more specified
commodities, currencies or indices) or securities of other issuers or any
combination of the foregoing will be set forth in the Prospectus Supplement for
such Offered Debentures.
 
     Unless otherwise indicated in the Prospectus Supplement, the following
provisions will apply to Offered Debentures that may be exchanged for or
converted into stock of any class of the Company ("Capital Stock"):
 
     The holder of any Debentures convertible into capital stock will have the
right exercisable at any time during the time period specified in the Prospectus
Supplement, unless previously redeemed by the Company, to convert such
Debentures into shares of capital stock (which may include Preferred Stock,
Class A Common Stock or Class A Special Common Stock) as specified in the
Prospectus Supplement, at the conversion rate for each $1,000 principal amount
of Debentures set forth in the Prospectus Supplement, subject to adjustment of
$1,000. (Section 13.2 of the Indentures). In the case of Debentures called for
redemption, conversion rights will expire at the close of business on the date
fixed for the redemption as may be specified in the Prospectus Supplement,
except that in the case of redemption at the option of the Debentureholder, if
applicable, such right will terminate upon receipt of written notice of the
exercise of such option. (Section 13.2 of the Indentures).
 
     In certain events, the conversion rate will be subject to adjustment as set
forth in the Indentures. Such events include the issuance of shares of any class
of Capital Stock of the Company as a dividend on the class of Capital Stock into
which the Debentures of such series are convertible; subdivisions, combinations
and reclassifications of the class of Capital Stock into which Debentures of
such series are convertible; the issuance to all holders of the class of Capital
Stock into which Debentures of such series are convertible of rights or warrants
entitling the Debentureholders (for a period not exceeding 45 days) to subscribe
for or purchase shares of such class of Capital Stock at a price per share less
than the current market price per share of such class of Capital Stock (as
defined in the Indentures); and the distribution to all holders of the class of
Capital Stock into which Debentures of such series are convertible of evidences
of indebtedness of the Company or of assets (excluding cash dividends paid from
retained earnings and dividends payable in Capital Stock for which adjustment is
made as referred to above) or subscription rights or warrants (other than those
referred to above). No adjustment of the conversion rate will be required unless
an adjustment would require a cumulative increase or decrease of at least 1% in
such rate. (Section 13.5 of the Indentures). Fractional shares of Capital Stock
will not be issued upon conversion but, in lieu thereof, the Company will pay a
cash adjustment. Convertible Debentures surrendered for conversion between the
record date for an interest payment, if any, and the interest payment date
(except convertible Debentures called for redemption on a redemption date during
such period) must be accompanied by payment of an amount equal to the interest
thereon which the registered holder is to receive. (Article 13 of the
Indentures).
 
MODIFICATION OF THE INDENTURES
 
     Modifications of any Indenture with respect to the Debentures of any series
may be made by the Company and the applicable Trustee with the consent of the
holders of not less than 66 2/3% in aggregate principal amount of outstanding
Debentures of such series; provided that no such modification may, without the
consent of the holder of each Debenture of such series affected thereby, (1)
extend the time or times of payment of the principal of, premium, if any, or
interest on, any
 
                                       10
<PAGE>   15
 
Debentures; (2) reduce the principal amount of, premium, if any, or the rate of
interest on any Debentures (and/or such other amount or amounts as any
Debentures or supplemental indentures with respect thereto may provide to be due
and payable upon declaration of acceleration of the maturity thereof); (3)
change the currency of payment of principal of, premium, if any, or the interest
on any Debenture; (4) reduce any amount payable on redemption thereof, (5) alter
or impair the right to convert or exchange the Debentures at the rate and upon
the terms provided in the Indenture; (6) alter or impair the right to require
redemption at the option of the holder; or (7) reduce the percentage of
Debentures of any series, the vote of the holders of which is necessary to
modify the Indenture. (Section 12.2 of the Indentures).
 
     Modifications of any Indenture with respect to the Debentures of any series
may be made by the Company and the Trustee without the consent of the
Debentureholders: (a) to add to the covenants and agreements of the Company or
to surrender any right or power reserved to or conferred upon the Company in the
Indenture; (b) to cure any ambiguity or to cure, correct or supplement any
defect or inconsistent provision contained in the Indenture; (c) to make such
provisions in regard to matters arising under the Indenture which may be
necessary or desirable, or otherwise change the Indenture in any manner, which
shall not adversely affect the interests of the Debentureholders of any series;
(d) to evidence the succession of another corporation to the Company and the
assumption by the successor corporation of the covenants, agreements and
obligations of the Company pursuant to the Indenture and to provide for the
adjustment of conversion rights pursuant to Section 13.7 upon consolidation,
merger, sale or conveyance of the Company; (e) to establish the form or terms of
the Debentures of any series as permitted by the Indenture; (f) to change or
eliminate any of the provisions of the Indenture, provided that any such change
or elimination shall become effective only when there is no Debenture
outstanding of any series created prior thereto which is entitled to the benefit
of such provision; (g) to add or change any of the provisions of the Indenture
to such extent as shall be necessary to permit or facilitate the issuance of
Debentures in bearer form or to provide for uncertificated Debentures (so long
as any "registration-required obligation" within the meaning of Section
163(f)(2) of the Internal Revenue Code of 1986, as amended (the "Code"), is in
registered form for purposes of the Code); (h) to amend or supplement any
provision contained in the Indenture, which was required to be contained in the
Indenture in order for the Indenture to be qualified under the Trust Indenture
Act of 1939, if the Trust Indenture Act of 1939 or regulations thereunder change
what is so required to be included in qualified indentures, in any manner not
inconsistent with what then may be required for such qualification; (i) to add
any additional events of default; (j) to convey, transfer, assign, mortgage or
pledge to the Trustee as security for the Debentures of one or more series any
property or assets; or (k) to add to or change any of the provisions of the
Indenture as contemplated in Section 11.7(b) relating to successor trustees.
(Section 12.1 of the Indentures).
 
DEFAULTS AND NOTICE
 
     The following are to be Events of Default with respect to Debentures of any
series, unless it is either inapplicable to a particular series or is
specifically deleted or modified for Debentures of a particular series, as
described in the Prospectus Supplement: (1) failure to pay the principal of, or
premium, if any, on any Debenture of such series when due and payable (whether
at maturity, by call for redemption, through any mandatory sinking fund, by
redemption at the option of the holder, by declaration of acceleration or
otherwise, and, with respect to Debentures issued pursuant to the Senior
Subordinated Indenture and the Subordinated Indenture, whether or not payment is
prohibited by the subordination provisions of such Indentures); (2) failure to
make a payment of any interest on any Debenture of such series when due,
continued for 30 days (with respect to Debentures issued pursuant to the Senior
Subordinated Indenture and the Subordinated Indenture, whether or not payment is
prohibited by the subordination provisions of such Indentures); (3) failure of
the Company to perform or observe any other covenants or agreements of the
Company in the Indenture or in the Debentures of such series (other than
agreements or covenants included in the Indentures solely for the benefit of a
series of Debentures other than that series), continued for 90 days after
written notice; (4) certain events of bankruptcy, insolvency or reorganization
of the Company; and (5) as to Senior Subordinated and Subordinated Debentures,
an event of default under any Senior Indebtedness (as
 
                                       11
<PAGE>   16
 
respectively defined) that has resulted in the acceleration of such indebtedness
prior to the expressed maturity thereof, which acceleration has not been
rescinded or annulled within 30 business days after written notice and which
acceleration is not contested by the Company in good faith. If an Event of
Default with respect to Debentures of any series shall happen and be continuing,
the Trustee or the holders of not less than 25% in aggregate principal amount of
the then outstanding Debentures of such series may declare the principal amount
(or, if the Debentures of such series are issued at an original issue discount,
such portion of the principal amount as may be specified in the terms of the
Debentures of such series) of all Debentures of such series and/or such other
amount or amounts as the Debentures or supplemental indenture with respect to
such series may provide, to be due and payable immediately. (Section 7.1 of the
Indentures).
 
     The Indentures provide that the Trustee will, within 90 days after the
occurrence of a default, give to holders of Debentures of any series notice of
all uncured defaults with respect to such series known to it; provided, however,
that, except in the case of a default that results from the failure to make any
payment of the principal of, premium, if any, or interest on the Debentures of
any series, or in the payment of any mandatory sinking fund installment with
respect to Debentures of such series, the Trustee may withhold such notice if it
in good faith determines that the withholding of such notice is in the interest
of the holders of Debentures of such series. (Section 11.3 of the Indentures).
 
     The Indentures contain a provision entitling the Trustee to be indemnified
by holders of Debentures before proceeding to exercise any trust or power under
the Indentures at the request of such holders. (Section 11.1 of the Indentures).
The Indentures provide that the holders of a majority in aggregate principal
amount of the then outstanding Debentures of any series may direct the time,
method and place of conducting any proceedings for any remedy available to the
Trustee or of exercising any trust or power conferred upon the Trustee with
respect to the Debentures of such series, provided, however, that the Trustee
may decline to follow any such direction if, among other reasons, the Trustee
determines in good faith that the actions or proceedings as directed may not
lawfully be taken, would involve the Trustee in personal liability or would be
unduly prejudicial to the holders of the Debentures of such series not joining
in such direction. (Section 7.6 of the Indentures). The right of a holder to
institute a proceeding with respect to the Indenture is subject to certain
conditions precedent including, without limitation, that the holders of a
majority in aggregate principal amount of the Debentures of such series then
outstanding make a written request upon the Trustee to exercise its powers under
the Indenture, indemnify the Trustee and afford the Trustee reasonable
opportunity to act but the holder has an absolute right to receipt of the
principal of, premium, if any, and interest when due, to require conversion or
exchange of Debentures if the Indentures provide for convertibility or
exchangeability, at the option of the holder and to institute suit for the
enforcement thereof. (Section 7.7 of the Indentures).
 
CONCERNING THE TRUSTEES
 
     Bankers Trust Company is the trustee under the Subordinated Indenture
pursuant to which the Company's 7% Convertible Subordinated Debentures Due 2001,
the Company's 3 3/8%/5 1/2% Step-up Convertible Subordinated Debentures Due 2005
and the Company's 1 1/8% Discount Convertible Subordinated Debentures Due 2007
have been issued. Bankers Trust Company is also the trustee under indentures
with respect to the Company's 10% Subordinated Debentures Due 2003 and the
Company's Zero Coupon Convertible Subordinated Notes Due 1995. Morgan Guaranty
Trust Company of New York is the trustee under the indenture with respect to the
Company's 11 7/8% Senior Subordinated Debentures Due 2004 and under the Senior
Subordinated Indenture pursuant to which the Company's 10 1/4% Senior
Subordinated Debentures Due 2001, the Company's 10 5/8% Senior Subordinated
Debentures Due 2012 and the Company's 9 1/2% Senior Subordinated Debentures Due
2008 have been issued.
 
REPORTS TO HOLDERS OF DEBENTURES
 
     The Company intends to furnish to holders of Debentures all quarterly and
annual reports which it furnishes to holders of the Company's Common Stock.
 
                                       12
<PAGE>   17
 
                         DESCRIPTION OF PREFERRED STOCK
 
     The Board of Directors of the Company is authorized to issue in one or more
series up to a maximum of 20,000,000 shares of preferred stock, without par
value. The shares can be issued with such designations, preferences,
qualifications, privileges, limitations, restrictions, options, conversion or
exchange rights and other special or relative rights as the Board of Directors
shall from time to time fix by resolution. The dividend, voting, conversion,
exchange, repurchase and redemption rights, if applicable, the liquidation
preference, and other specific terms of each series of the Preferred Stock will
be set forth in the Prospectus Supplement. The Company currently has no shares
of preferred stock outstanding.
 
     The applicable Prospectus Supplement will describe the following terms of
any Preferred Stock in respect of which this Prospectus is being delivered (to
the extent applicable to such Preferred Stock): (1) the specific designation,
number of shares, seniority and purchase price; (2) any liquidation preference
per share; (3) any date of maturity; (4) any redemption, repayment or sinking
fund provisions; (5) any dividend rate or rates and the dates on which any such
dividends will be payable (or the method by which such rates or dates will be
determined); (6) any voting rights; (7) if other than the currency of the United
States of America, the currency or currencies including composite currencies in
which such Preferred Stock is denominated and/or in which payments will or may
be payable; (8) the method by which amounts in respect of such Preferred Stock
may be calculated and any commodities, currencies or indices, or value, rate or
price, relevant to such calculation; (9) whether the Preferred Stock is
convertible or exchangeable and, if so, the securities or rights into which such
Preferred Stock is convertible or exchangeable (which may include other
Preferred Stock, Debentures, Class A Common Stock, Class A Special Common Stock
or other securities or rights of the Company (including rights to receive
payment in cash or securities based on the value, rate or price of one or more
specified commodities, currencies or indices) or securities of other issuers or
a combination of the foregoing), and the terms and conditions upon which such
conversions or exchanges will be effected including the initial conversion or
exchange prices or rates, the conversion or exchange period and any other
related provisions; (10) the place or places where dividends and other payments
on the Preferred Stock will be payable; and (11) any additional voting,
dividend, liquidation, redemption and other rights, preferences, privileges,
limitations and restrictions.
 
     As described under "Description of Depositary Shares," the Company may, at
its option, elect to offer depositary shares ("Depositary Shares") evidenced by
depositary receipts ("Depositary Receipts"), each representing an interest (to
be specified in the Prospectus Supplement relating to the particular series of
the Preferred Stock) in a share of the particular series of the Preferred Stock
issued and deposited with a Depositary (as defined below).
 
     All shares of Preferred Stock offered hereby, or issuable upon conversion,
exchange or exercise of Securities, will, when issued, be fully paid and
non-assessable. The Company has been advised that the Preferred Stock will be
exempt from existing Pennsylvania personal property tax.
 
                                       13
<PAGE>   18
 
                        DESCRIPTION OF DEPOSITARY SHARES
 
     The description set forth below and in any Prospectus Supplement of certain
provisions of the Deposit Agreement (as defined below) and of the Depositary
Shares and Depositary Receipts does not purport to be complete and is subject
to, and qualified in its entirety by reference to, the form of Deposit Agreement
and form of Depositary Receipts relating to each series of the Preferred Stock.
 
GENERAL
 
     The Company may, at its option, elect to have shares of Preferred Stock be
represented by Depositary Shares. The shares of any series of the Preferred
Stock underlying the Depositary Shares will be deposited under a separate
deposit agreement (the "Deposit Agreement") between the Company and a bank or
trust company selected by the Company (the "Depositary"). The Prospectus
Supplement relating to a series of Depositary Shares will set forth the name and
address of the Depositary. Subject to the terms of the Deposit Agreement, each
owner of a Depositary Share will be entitled, in proportion to the applicable
interest in the number of shares of Preferred Stock underlying such Depositary
Share, to all the rights and preferences of the Preferred Stock underlying such
Depositary Share (including dividend, voting, redemption, conversion, exchange
and liquidation rights).
 
     The Depositary Shares will be evidenced by Depositary Receipts issued
pursuant to the Deposit Agreement, each of which will represent the applicable
interest in a number of shares of a particular series of the Preferred Stock
described in the applicable Prospectus Supplement.
 
     Unless otherwise specified in the Prospectus Supplement, a holder of
Depositary Shares is not entitled to receive the shares of Preferred Stock
underlying the Depositary Shares.
 
DIVIDENDS AND OTHER DISTRIBUTIONS
 
     The Depositary will distribute all cash dividends or other cash
distributions received in respect of the Preferred Stock to the record holders
of Depositary Shares representing such Preferred Stock in proportion to the
numbers of such Depositary Shares owned by such holders on the relevant record
date.
 
     In the event of a distribution other than in cash, the Depositary will
distribute property received by it to the record holders of Depositary Shares
entitled thereto or the Depositary may, with the approval of the Company, sell
such property and distribute the net proceeds from such sale to such holders.
 
     The Deposit Agreement also contains provisions relating to the manner in
which any subscription or similar rights offered by the Company to holders of
Preferred Stock shall be made available to holders of Depositary Shares.
 
CONVERSION AND EXCHANGE
 
     If any Preferred Stock underlying the Depositary Shares is subject to
provisions relating to its conversion or exchange as set forth in the Prospectus
Supplement relating thereto, each record holder of Depositary Shares will have
the right or obligation to convert or exchange such Depositary Shares pursuant
to the terms thereof.
 
REDEMPTION OF DEPOSITARY SHARES
 
     If Preferred Stock underlying the Depositary Shares is subject to
redemption, the Depositary Shares will be redeemed from the proceeds received by
the Depositary resulting from the redemption, in whole or in part, of the
Preferred Stock held by the Depositary. The redemption price per Depositary
Share will be equal to the aggregate redemption price payable with respect to
the number of shares of Preferred Stock underlying the Depositary Shares.
Whenever the Company redeems Preferred Stock from the Depositary, the Depositary
will redeem as of the same redemption date a
 
                                       14
<PAGE>   19
 
proportionate number of Depositary Shares representing the shares of Preferred
Stock that were redeemed. If less than all the Depositary Shares are to be
redeemed, the Depositary Shares to be redeemed will be selected by lot or pro
rata as may be determined by the Company.
 
     After the date fixed for redemption, the Depositary Shares so called for
redemption will no longer be deemed to be outstanding and all rights of the
holders of the Depositary Shares will cease, except the right to receive the
redemption price payable upon such redemption. Any funds deposited by the
Company with the Depositary for any Depositary Shares which the holders thereof
fail to redeem shall be returned to the Company after a period of two years from
the date such funds are so deposited.
 
VOTING
 
     Upon receipt of notice of any meeting or action in lieu of any meeting at
which the holders of any shares of Preferred Stock underlying the Depositary
Shares are entitled to vote, the Depositary will mail the information contained
in such notice to the record holders of the Depositary Shares relating to such
Preferred Stock. Each record holder of such Depositary Shares on the record date
(which will be the same date as the record date for the Preferred Stock) will be
entitled to instruct the Depositary as to the exercise of the voting rights
pertaining to the number of shares of Preferred Stock underlying such holder's
Depositary Shares. The Depositary will endeavor, insofar as practicable, to vote
the number of shares of Preferred Stock underlying such Depositary Shares in
accordance with such instructions, and the Company will agree to take all action
which may be deemed necessary by the Depositary in order to enable the
Depositary to do so.
 
AMENDMENT OF THE DEPOSIT AGREEMENT
 
     The form of Depositary Receipt evidencing the Depositary Shares and any
provision of the Deposit Agreement may at any time be amended by agreement
between the Company and the Depositary, provided, however, that any amendment
which materially and adversely alters the rights of the existing holders of
Depositary Shares will not be effective unless such amendment has been approved
by at least a majority of the Depositary Shares then outstanding.
 
CHARGES OF DEPOSITARY
 
     The Company will pay all transfer and other taxes and governmental charges
that arise solely from the existence of the depositary arrangements. The Company
will pay charges of the Depositary in connection with the initial deposit of the
Preferred Stock and any exchange or redemption of the Preferred Stock. Holders
of Depositary Shares will pay all other transfer and other taxes and
governmental charges, and, in addition, such other charges as are expressly
provided in the Deposit Agreement to be for their accounts.
 
MISCELLANEOUS
 
     The Company, or at the option of the Company, the Depositary, will forward
to the holders of Depositary Shares all reports and communications from the
Company which the Company is required to furnish to the holders of Preferred
Stock.
 
     Neither the Depositary nor the Company will be liable if it is prevented or
delayed by law or any circumstances beyond its control in performing its
obligations under the Deposit Agreement. The obligations of the Company and the
Depositary under the Deposit Agreement will be limited to performance in good
faith of their duties thereunder and they will not be obligated to prosecute or
defend any legal proceeding in respect of any Depositary Share or Preferred
Stock unless satisfactory indemnity has been furnished. The Company and the
Depositary may rely upon written advice of counsel or accountants, or
information provided by persons presenting Preferred Stock for deposit, holders
of Depositary Shares or other persons believed to be competent and on documents
believed to be genuine.
 
                                       15
<PAGE>   20
 
RESIGNATION AND REMOVAL OF DEPOSITARY; TERMINATION OF THE
DEPOSIT AGREEMENT
 
     The Depositary may resign at any time by delivering to the Company notice
of its election to do so, and the Company may at any time remove the Depositary,
any such resignation or removal to take effect upon the appointment of a
successor Depositary and its acceptance of such appointment. Such successor
Depositary will be appointed by the Company within 60 days after delivery of the
notice of resignation or removal. The Deposit Agreement may be terminated at the
direction of the Company or by the Depositary if a period of 90 days shall have
expired after the Depositary has delivered to the Company written notice of its
election to resign and a successor depositary shall not have been appointed.
Upon termination of the Deposit Agreement, the Depositary will discontinue the
transfer of Depositary Receipts, will suspend the distribution of dividends to
the holders thereof, and will not give any further notices (other than notice of
such termination) or perform any further acts under the Deposit Agreement except
that the Depositary will continue to deliver Preferred Stock certificates,
together with such dividends and distributions and the net proceeds of any sales
of rights, preferences, privileges or other property in exchange for Depositary
Receipts surrendered. Upon request of the Company, the Depositary shall deliver
all books, records, certificates evidencing Preferred Stock, Depositary Receipts
and other documents relating to the subject matter of the Depositary Agreement
to the Company.
 
                          DESCRIPTION OF COMMON STOCK
 
     The statements made under this caption include summaries of certain
provisions contained in the Company's Articles of Incorporation and By-Laws.
These statements do not purport to be complete and are qualified in their
entirety by reference to such Articles of Incorporation and By-Laws.
 
     The Company has three classes of Common Stock outstanding: Class A Special
Common Stock, $1.00 par value per share; Class A Common Stock, $1.00 par value
per share; and Class B Common Stock, $1.00 par value per share. There are
currently 350,000,000 shares of Class A Special Common Stock, 200,000,000 shares
of Class A Common Stock and 50,000,000 shares of Class B Common Stock
authorized. At September 30, 1993, there were 98,416,602 shares of Class A
Special Common Stock, 38,903,012 shares of Class A Common Stock and 8,786,250
shares of Class B Common Stock outstanding.
 
DIVIDENDS
 
     Subject to the preferential rights of any preferred stock then outstanding,
the holders of Class A Special Common Stock, Class A Common Stock and Class B
Common Stock are entitled to receive pro rata per share such cash dividends as
from time to time may be declared by the Company's Board of Directors out of
funds legally available therefor. Each class of the Company's Common Stock is to
receive dividends, as declared, on an equal basis per share.
 
     Stock dividends on, and stock splits of, any class of Common Stock shall
not be paid or issued unless paid or issued on all classes of Common Stock, in
which case they are to be paid or issued only in shares of that class or in
shares of either Class A Common Stock or Class A Special Common Stock.
 
VOTING RIGHTS
 
     The holders of the Class A Special Common Stock are not entitled to vote in
the election of directors or otherwise, except where class voting is required by
applicable law or the Company's Articles of Incorporation, in which case, each
holder of Class A Special Common Stock shall be entitled to one vote per share.
Each holder of Class A Common Stock has one vote per share and each holder of
Class B Common Stock has 15 votes per share. The Articles of Incorporation
provide that the Class A Special Common Stock, the Class A Common Stock and the
Class B Common Stock vote as separate classes on certain amendments to the
Articles of Incorporation regarding conversion rights of the Class B Common
Stock and as required by applicable law. Under applicable law, holders of Class
A
 
                                       16
<PAGE>   21
 
Special Common Stock have voting rights in the event of certain amendments to
the Articles of Incorporation and certain mergers and other fundamental
corporate changes. In all other instances, including the election of directors,
the Class A Common Stock and the Class B Common Stock vote as one class. Neither
the holders of Class A Common Stock nor the holders of Class B Common Stock have
cumulative voting rights.
 
PRINCIPAL SHAREHOLDER
 
     Sural Corporation ("Sural") is the sole owner of all of the outstanding
shares of the Company's Class B Common Stock (8,786,250 shares outstanding at
September 30, 1993). As of such date, Sural also owns 1,845,037 shares of the
Class A Common Stock and 86 shares of the Class A Special Common Stock. Based
upon the number of shares of both classes of voting Common Stock outstanding at
September 30, 1993, Sural is entitled to cast approximately 78% of the votes
which all shareholders are entitled to cast. Ralph J. Roberts, the Chairman of
the Board of Directors of the Company, controls Sural and, in addition, at
September 30, 1993, was the beneficial owner of 769,729 shares of the Class A
Special Common Stock and 363,282 shares of the Class A Common Stock, excluding
shares issuable upon the exercise of options. In addition, as of such date, Mr.
Roberts also held options to purchase 438,750 shares of Class B Common Stock and
2,230,519 shares of Class A Special Common Stock.
 
CONVERSION OF CLASS B COMMON STOCK
 
     The Class B Common Stock is convertible share for share into either the
Class A Common Stock or the Class A Special Common Stock.
 
PREFERENCE ON LIQUIDATION
 
     In the event of the liquidation, dissolution or winding up, either
voluntary or involuntary, of the Company, the holders of Class A Special Common
Stock, Class A Common Stock and Class B Common Stock are entitled to receive,
subject to any liquidation preference of any preferred stock then outstanding,
the remaining assets, if any, of the Company in proportion to the number of
shares held by them without regard to class.
 
MISCELLANEOUS
 
     The holders of Class A Special Common Stock, Class A Common Stock and Class
B Common Stock do not have any preemptive rights, except that if the right to
subscribe to stock, options or warrants to purchase stock is offered or granted
to all holders of Class A Special Common Stock or Class A Common Stock, parallel
rights must be given to all holders of Class B Common Stock. All shares of Class
A Special Common Stock, Class A Common Stock and Class B Common Stock presently
outstanding are, and all shares of the Class A Special Common Stock and Class A
Common Stock offered hereby, or issuable upon conversion, exchange or exercise
of Securities, will, when issued, be, fully paid and non-assessable. The Company
has been advised that the Class A Special Common Stock and Class A Common Stock
are exempt from existing Pennsylvania personal property tax.
 
     The transfer agent and registrar for the Company's Class A Special Common
Stock and Class A Common Stock is The Bank of New York, One Wall Street, New
York, New York 10286.
 
                            DESCRIPTION OF WARRANTS
 
GENERAL
 
     The Company may issue Warrants to purchase Securities or other securities
or rights of the Company (including rights to receive payment in cash or
securities based on the value, rate or price of one or more specified
commodities, currencies or indices) or securities of other issuers or any
combination of the foregoing. Warrants may be issued independently or together
with any Securities and may be attached to or separate from such Securities.
Each series of Warrants will be issued under a
 
                                       17
<PAGE>   22
 
separate warrant agreement (each a "Warrant Agreement") to be entered into
between the Company and a warrant agent ("Warrant Agent"). The following sets
forth certain general terms and provisions of the Warrants offered hereby.
Further terms of the Warrants and the applicable Warrant Agreement are set forth
in the applicable Prospectus Supplement.
 
     The applicable Prospectus Supplement will describe the following terms of
any Warrants in respect of which this Prospectus is being delivered: (1) the
title of such Warrants; (2) the aggregate number of such Warrants; (3) the price
or prices at which such Warrants will be issued; (4) the currency or currencies,
including composite currencies, in which the price of such Warrants may be
payable; (5) the Securities or other securities or rights of the Company
(including rights to receive payment in cash or securities based on the value,
rate or price of one or more specified commodities, currencies or indices) or
securities of other issuers or any combination of the foregoing purchasable upon
exercise of such Warrants; (6) the price at which and the currency or
currencies, including composite currencies, in which the Securities purchasable
upon exercise of such Warrants may be purchased; (7) the date on which the right
to exercise such Warrants shall commence and the date on which such right shall
expire; (8) if applicable, the minimum or maximum amount of such Warrants which
may be exercised at any one time; (9) if applicable, the designation and terms
of the Securities with which such Warrants are issued and the number of such
Warrants issued with each such Security; (10) if applicable, the date on and
after which such Warrants and the related Securities will be separately
transferable; (11) information with respect to book-entry procedures, if any;
(12) if applicable, a discussion of certain United States Federal income tax
considerations; and (13) any other terms of such Warrants, including terms,
procedures and limitations relating to the exchange and exercise of such
Warrants.
 
                             UNITED STATES TAXATION
 
     The following summary describes certain United States federal income tax
consequences to initial holders of ownership and disposition of the Securities
held as capital assets within the meaning of Section 1221 of the Code. This
summary is based on the Internal Revenue Code of 1986, as amended to the date
hereof (the "Code"), administrative pronouncements, judicial decisions and
existing and proposed Treasury Regulations, including proposed regulations
concerning the treatment of debt instruments issued with original issue discount
(the "Proposed Regulations") changes to any of which subsequent to the date of
this Prospectus may affect the tax consequences described herein. Although the
Proposed Regulations, by their terms, do not apply to debt instruments issued
prior to or within 60 days after they are published in final form, they
represent the only current administrative guidance on certain issues affecting
the appropriate tax treatment of the Debentures. It is possible that different
rules will be contained in subsequent proposed, temporary or final regulations.
This summary does not discuss all of the tax consequences that may be relevant
to a holder in light of his particular circumstances or to holders subject to
special rules, such as certain financial institutions, insurance companies,
dealers in securities or foreign currencies, persons holding any such securities
as a hedge against, or which are hedged against, currency risks, or United
States Holders whose functional currency (as defined in Code Section 985) is not
the U.S. dollar. Persons considering the purchase of Securities should consult
their tax advisors with regard to the application of the United States federal
income tax laws to their particular situations as well as any tax consequences
arising under the laws of any state, local or foreign taxing jurisdiction.
 
     As used herein, the term "United States Holder" means an owner of
Securities that is for United States federal income tax purposes (i) a citizen
or resident of the United States, (ii) a corporation, partnership or other
entity created or organized in or under the laws of the United States or any
political subdivision thereof, or (iii) an estate or trust the income of which
is subject to United States federal income taxation regardless of its source.
 
     As used herein, the term "United States Alien Holder" means a holder of
Securities that is, for United States federal income tax purposes, (i) a
nonresident alien individual, (ii) a foreign corporation, (iii) a nonresident
alien fiduciary of a foreign estate or trust or (iv) a foreign partnership one
or
 
                                       18
<PAGE>   23
 
more of the members of which is, for United States federal income tax purposes,
a nonresident alien individual, a foreign corporation or a nonresident alien
fiduciary of a foreign estate or trust.
 
TAX CONSEQUENCES TO UNITED STATES HOLDERS
 
     PAYMENTS OF INTEREST
 
     Interest payments under the Debentures (including payments received on the
sale, exchange or retirement of Debentures attributable to accrued but unpaid
interest) will generally be taxable to a United States Holder as ordinary
interest income at the time it accrues or is received (or is made available for
payment, if earlier) in accordance with the United States Holder's method of
accounting for federal income tax purposes. Special rules governing the
treatment of interest paid with respect to Original Issue Discount Debentures
(as defined below), including certain Contingent Payment Debentures (as defined
below), Debentures having a maximum or minimum interest rate limitation,
Debentures that are denominated, or provide for payments in or indexed to a
foreign currency ("Foreign Currency Debentures") and Debentures providing for
payments of principal or interest linked to commodity prices, equity indices or
other factors are described under "Original Issue Discount Debentures" and
"Foreign Currency Debentures, Indexed Debentures and Debentures Linked to
Commodity Prices, Equity Indices or Other Factors," below. Holders intending to
purchase such Debentures should refer to the discussion relating to taxation in
the applicable Prospectus Supplement.
 
     SALE, EXCHANGE OR RETIREMENT OF DEBENTURES
 
     Upon the sale, exchange or retirement of a Debenture, a United States
Holder will recognize taxable gain or loss equal to the difference between the
amount realized on the sale, exchange or retirement (not including any amount
attributable to accrued but unpaid interest) and such Holder's adjusted tax
basis in the Debenture. A United States Holder's adjusted tax basis in a
Debenture will equal the cost of the Debenture to such Holder, increased by the
amounts of any original issue discount previously included in income by the
Holder with respect to such Debenture and reduced by any amortized premium and
any principal payments received by the Holder and, in the case of an Original
Issue Discount Debenture, by the amounts of any other payments that do not
constitute "qualified stated interest" (as defined below).
 
     Gain or loss realized on the sale, exchange or retirement of a Debenture
generally will be capital gain or loss (except in the case of a short-term
Original Issue Discount Debenture (as defined below), to the extent of any
original issue discount not previously included in the Holder's taxable income),
and will be long-term capital gain or loss if at the time of sale, exchange or
retirement the Debenture has been held for more than one year. See "Original
Issue Discount Debentures" below. Under current law, the excess of net long-term
capital gains over net short-term capital losses is taxed at a lower rate than
ordinary income for certain noncorporate taxpayers. The distinction between
capital gain or loss and ordinary income or loss is also relevant for purposes
of, among other things, limitations on the deductibility of capital losses.
Notwithstanding the foregoing, gain or loss realized upon the sale, exchange or
retirement of a Foreign Currency Debenture that is attributable to fluctuations
in currency exchange rates will be ordinary income or loss which will not be
treated as interest income or expense. In addition, under Code Sections 165(j)
and 1287(a), a United States Holder of a Bearer Debenture or coupon generally
will not be entitled to deduct any loss on such Bearer Debenture or coupon and
must treat as ordinary income any gain realized on the sale or other disposition
(including the receipt of principal) of such Bearer Debenture or coupon.
 
     CONVERSION OF DEBENTURES
 
     The Holder of a Debenture convertible into shares of Preferred Stock, Class
A Common Stock or Class A Special Common Stock or a combination of these will
recognize no gain or loss on the conversion of the Debentures into such stock
(except possibly to the extent such stock discharges accrued, but unpaid,
interest) and will have an adjusted tax basis in such stock equal to the
Holder's
 
                                       19
<PAGE>   24
 
adjusted tax basis in the Debenture at the time of the conversion. If the
Debentures are convertible into a combination of Preferred Stock, Class A Common
Stock and Class A Special Common Stock, the Holder's adjusted tax basis in the
Debenture at the time of conversion will be allocated to the Preferred Stock,
Class A Common Stock and Class A Special Common Stock in proportion to their
respective fair market values on the date of conversion. The holding period for
such stock will include the holding period for the converted Debenture, except
that the holding period of such stock allocable to accrued original issue
discount (or possibly in the case of stock allocable to accrued, but unpaid,
interest), if any, may commence on the day following the date of conversion.
 
     Gain or loss will be recognized upon the receipt of cash paid in lieu of
fractional shares of such stock to the extent of the difference between the
amount of cash received and the amount of tax basis allocable to the fractional
shares redeemed. The gain or loss generally will be treated as capital in nature
provided the Debenture is held as a capital asset on the date of conversion.
 
     If at any time there is a change in the conversion rate or the securities
issuable upon conversion under the anti-dilution provisions of the Indenture
(other than to take account of a stock dividend or stock split), such change may
be treated pursuant to Section 305 of the Code as a constructive distribution of
stock to Holders of the Debentures at the time and if so the value of such
change would be taxable as a dividend to the extent of the current and
accumulated earnings and profits of the Company.
 
     ORIGINAL ISSUE DISCOUNT DEBENTURES
 
     Under the Code, a Debenture which is issued for an amount less than its
stated redemption price at maturity will generally be considered to have been
issued at an original issue discount for federal income tax purposes (an
"Original Issue Discount Debenture"). The stated redemption price at maturity of
a Debenture will equal the sum of all payments required under the Debenture
other than certain contingent payments and payments of "qualified stated
interest" (defined as a series of payments in cash or property (other than debt
instruments of the issuer) unconditionally payable at least annually during the
entire term of the Debenture and equal to the outstanding principal balance of
the Debenture multiplied by a single fixed rate of interest, or a single
qualified floating rate of interest, a single fixed rate followed by a single
qualified floating rate, a single qualified floating rate followed by a second
qualified floating rate, a single rate based on one or more qualified floating
rates or a single rate based on the price of actively traded property or an
index of the prices of such property, other than foreign currency). Special
rules may apply if a floating rate Debenture is subject to a cap (or a floor)
that is very likely to cause the interest rate in one or more accrual periods,
known as of the issue date, to be significantly less (or more) than the overall
expected return on such floating rate Debenture.
 
     If the difference between a Debenture's stated redemption price at maturity
and its issue price is less than a de minimis amount, i.e., 1/4 of 1 percent of
the stated redemption price at maturity multiplied by the number of complete
years to maturity, then the Debenture will not be considered to have original
issue discount.
 
     United States Holders of Original Issue Discount Debentures will be
required to include any payments of qualified stated interest in income at the
time they are accrued or received (or made available for payment, if earlier),
in accordance with the Holder's method of accounting for federal income tax
purposes. United States Holders of Original Issue Discount Debentures that
mature more than one year from their date of issuance will be required to
include original issue discount in income for federal income tax purposes as it
accrues (regardless of their general accounting methods), in accordance with a
constant yield method based on a compounding of interest at the end of each
accrual period. Under this method, United States Holders of Original Issue
Discount Debentures generally will be required to include in income increasingly
greater amounts of original issue discount in successive accrual periods.
 
                                       20
<PAGE>   25
 
     In the case of certain Debentures providing for variable or contingent
interest that is not qualified stated interest, the Proposed Regulations provide
that such Debentures ("Contingent Payment Debentures") will be treated as
Original Issue Discount Debentures. Variable or contingent interest payments on
Contingent Payment Debentures (other than payments of qualified stated interest)
will generally be treated as contingent interest payments includible in income
as the amount of such payments becomes fixed. If such payments are not due
within six months of the date their amount becomes fixed, the right to receive
such payments will be includible in income when their amount becomes fixed at a
discounted values determined under Code Section 1274, and the remaining portion
of such payments will be includible in income as original issue discount over
the period between the date on which the payments are fixed and the date on
which payment is due. If a Contingent Payment Debenture does not provide for
fixed and unconditional payments at least equal to the issue price of the
Debenture, a portion of any variable or contingent payments due prior to
maturity may be treated as a payment of principal.
 
     Holders purchasing Contingent Payment Debentures should carefully examine
the applicable Prospectus Supplement as it relates to the particular terms of
the Debentures being offered, and they should consult their tax advisors as to
the federal income tax consequences of purchasing, holding and disposing of
Contingent Payment Debentures with such terms, as the tax consequences will
depend, in part, on the particular terms of the purchased Debentures.
 
     In general, a cash method United States Holder of an Original Issue
Discount Debenture that matures one year or less from its date of issuance (a
"short-term Original Issue Discount Debenture") is not required to accrue
original issue discount for United States Federal income tax purposes unless it
elects to do so. Holders who make such an election, Holders who report income
for federal income tax purposes on the accrual method and certain other Holders,
including banks and dealers in securities, are required to include original
issue discount in income on such short-term Original Issue Discount Debentures
as it accrues on a straight-line basis, unless an election is made to accrue the
original issue discount according to a constant yield method based on daily
compounding. In the case of Holders who are not required or who do not elect to
include original issue discount in income currently, any gain realized on the
sale, exchange or retirement of the short-term Original Issue Discount Debenture
will be ordinary income to the extent of the original issue discount accrued on
a straight-line basis (or, if elected, according to a constant yield method
based on daily compounding) through the date of sale, exchange or retirement. In
addition, such Holders will be required to defer deductions for any interest
paid on indebtedness incurred to purchase or carry short-term Original Issue
Discount Debentures in an amount not exceeding the deferred interest income,
until such deferred interest income is recognized.
 
     Certain of the Original Issue Discount Debentures may be redeemed prior to
maturity. Original Issue Discount Debentures containing such a feature may be
subject to rules that differ from the general rules discussed above. Purchasers
of Original Issue Discount Debentures with such a feature should carefully
examine the applicable Prospectus Supplement and should consult their tax
advisors with respect to such a feature since the tax consequences with respect
to original issue discount will depend, in part, on the particular terms and the
particular features of the purchased Debenture.
 
     If a United States Holder purchases a Debenture for an amount that is
greater than the amount payable at maturity, such Holder will be considered to
have purchased such Debenture with "amortizable bond premium" equal in amount to
such excess, and may elect (in accordance with applicable Code provisions) to
amortize such premium, using a constant yield method based on a compounding of
interest at the end of each accrual period, over the remaining term of the
Debenture (where such Debenture is not optionally redeemable prior to its
maturity date). If such Debenture may be optionally redeemed prior to maturity,
the amount of amortizable bond premium is determined with reference to either
the amount payable on maturity or, if it results in a smaller premium
attributable to the period to the earlier redemption date, with reference to the
amount payable on the earlier redemption date. A Holder who elects to amortize
bond premium must reduce his tax basis in the Debenture by the amount of the
premium amortized in any year. An election to amortize bond
 
                                       21
<PAGE>   26
 
premium applies to all taxable debt obligations then owned and thereafter
acquired by the taxpayer and may be revoked only with the consent of the
Internal Revenue Service.
 
     Under the Proposed Regulations, which are not yet effective, a Holder that
uses an accrual method of accounting may elect to include in gross income its
entire return on a Debenture (i.e., the excess of all payments to be received on
the Debenture over the amount paid for the Debenture by such Holder) in
accordance with a constant yield method based on the compounding of interest at
the end of each accrual period. Such an election for a Debenture with
amortizable bond premium will result in a deemed election to amortize bond
premium for all of the Holder's debt instruments with amortizable bond premium
and may be revoked only with the permission of the Internal Revenue Service with
respect to debt instruments acquired after revocation.
 
     Finally, this discussion does not apply in the case of any Original Issue
Discount Debentures which qualify as "applicable high-yield discount
obligations" under Section 163(i) of the Code. United States Holders of Original
Issue Discount Debentures which are "applicable high-yield discount obligations"
may be subject to special rules which will be set forth in an applicable
Prospectus Supplement. United States Holders should consult their own tax
advisors as to the federal income tax consequences of holding such obligations.
 
     The Company will file with the Internal Revenue Service such information
regarding the original issue discount that applicable Treasury regulations
require.
 
     FOREIGN CURRENCY DEBENTURES, INDEXED DEBENTURES AND DEBENTURES LINKED TO
     COMMODITY PRICES, EQUITY INDICES OR OTHER FACTORS
 
     The United States federal income tax consequences to a Holder of the
ownership and disposition of Foreign Currency Debentures, indexed Debentures or
Debentures linked to commodity prices, equity indices or other factors
(including Debentures exchangeable for property other than stock of the Company)
may differ materially from those described herein, depending on the exact terms
of such Debentures. Holders intending to purchase such Debentures should refer
to the discussion relating to taxation in the applicable Prospectus Supplement.
 
     PAYMENTS OF DIVIDENDS
 
     Distributions by the Company with respect to shares of the Class A Special
Common Stock, Class A Common Stock or Preferred Stock (other than certain pro
rata distributions of shares or rights with respect to shares) generally will
constitute dividends for U.S. federal income tax purposes to the extent that
such distributions are paid out of the Company's current and accumulated
earnings and profits, as determined under U.S. federal tax principles, and may
be eligible for the 70% dividends received deduction allowed to corporate
shareholders.
 
     Prospective investors should consider the effect of (i) Section 246A of the
Code, which reduces the dividends-received deduction allowed to a corporate
shareholder which has incurred indebtedness that is "directly attributable" to
an investment in portfolio stock; (ii) Section 246(c) of the Code, which
disallows the dividends-received deduction, among other things, in respect of
any share of stock that is held for 45 days or less; (iii) Section 1059 of the
Code, which, under certain circumstances, reduces the basis of stock for the
purposes of calculating gain or loss in a subsequent disposition by the portion
of any "extraordinary dividend" that is eligible for the dividends-received
deduction; and (iv) the corporate alternative minimum tax, which generally
includes the amount of a corporate holder's dividends received deduction in the
computation of alternative minimum taxable income. To the extent, if any, that
the amount of any distribution by the Company exceeds the Company's current and
accumulated earnings and profits as determined under U.S. federal income tax
principles, such excess will be treated first as a tax-free return of the
Holder's tax basis in the shares and thereafter as capital gain.
 
                                       22
<PAGE>   27
 
     GAIN OR LOSS ON DISPOSITION OF EQUITY SECURITIES
 
     United States Holders generally will recognize capital gain or loss upon
the sale, exchange or other disposition of shares of Preferred Stock, Class A
Special Common Stock, Class A Common Stock, or Warrants equal to the difference
between the amount realized on the sale, exchange or other disposition and such
Holder's adjusted tax basis in such securities. In the case of a redemption of
stock by the Company, however, gain or loss will be capital only if the
redemption falls within one of the categories enumerated in Section 302(b) of
the Code.
 
     WARRANTS
 
     As a general rule, no gain or loss will be recognized to a United States
Holder on the exercise of a Warrant to purchase securities. The tax basis of
securities so acquired will be equal to the sum of the Holder's adjusted tax
basis in the exercised Warrant and the exercise price, but the holding period of
such securities will not include the holding period of the Warrant exercised.
 
     Under Section 305 of the Code, adjustments to the exercise price of
Warrants to purchase equity securities which occur under certain circumstances,
or the failure to make such adjustments, may result in a deemed dividend to
Holders.
 
     Upon expiration of a Warrant, a United States Holder will recognize a loss
equal to such Holder's tax basis in the Warrant. If the securities issuable upon
exercise of the Warrant would have been a capital asset of the Holder if
acquired by the Holder, such loss will be a capital loss.
 
     BACKUP WITHHOLDING AND INFORMATION REPORTING
 
     Under current United States federal income tax law, a 31% backup
withholding tax and information reporting requirements apply to certain payments
of dividends, principal, premium and interest (including original issue
discount) made to, and to the proceeds of sale of securities by, certain
noncorporate United States persons.
 
     In the case of a United States Holder, backup withholding will apply only
if the Holder (i) fails to furnish his Taxpayer Identification Number ("TIN"),
(ii) furnishes an incorrect TIN, (iii) is notified by the Internal Revenue
Service that he has failed to properly report payments of interest and dividends
or (iv) under certain circumstances, fails to certify that he is not subject to
backup withholding. United States Holders should consult their tax advisors
regarding their qualification for exemption from backup withholding and the
procedure for obtaining such an exemption if applicable.
 
     The amount of any backup withholding from a payment to a United States
Holder will be allowed as a credit against such Holder's United States federal
income tax liability and may entitle such Holder to a refund, provided that the
required information is furnished to the Internal Revenue Service.
 
TAX CONSEQUENCES TO UNITED STATES ALIEN HOLDERS
 
     Under present United States federal income and estate tax law, and subject
to the discussions below concerning FIRPTA and backup withholding:
 
          (a) a United States Alien Holder of Securities will not be subject to
     United States federal income tax on gain realized on the sale, exchange or
     other disposition of Securities (including the receipt of cash in lieu of
     fractional shares upon conversion of a Security) unless (i) such Holder is
     an individual who is present in the United States for a period or periods
     aggregating 183 days or more in the taxable year of disposition, and
     certain other conditions are met, or (ii) the gain is effectively connected
     with a trade or business of the Holder in the United States or, if a tax
     treaty applies, is attributable to a United States permanent establishment
     of the Holder;
 
          (b) payments of principal, interest (including original issue
     discount, if any) and premium on the Debentures to any United States Alien
     Holder will not be subject to United States federal withholding tax
     provided that, in the case of interest, (i) such Holder does not own,
     actually or
 
                                       23
<PAGE>   28
 
     constructively, 10 percent or more of the total combined voting power of
     all classes of stock of the Company entitled to vote, is not a controlled
     foreign corporation related, directly or indirectly, to the Company through
     stock ownership, and is not a bank receiving interest described in Section
     881(c)(3)(A) of the Code and (ii) if the Debenture is a Registered
     Debenture, the beneficial owner thereof fulfills the statement requirement
     set forth in Section 871(h) or Section 881(c) of the Code;
 
          (c) dividends paid on shares of Preferred Stock, Class A Common Stock
     or Class A Special Common Stock to a United States Alien Holder will be
     subject to withholding tax at a rate of 30% or such lower rate as may be
     provided by an applicable tax treaty; and
 
          (d) no United States Federal income tax will be imposed upon the
     exercise of a Warrant or the conversion of a Security into shares of
     Preferred Stock, Class A Common Stock or Class A Special Common Stock,
     subject, with respect to the receipt of cash in lieu of fractional shares
     by certain Holders, to the limitation described in clause (a) above;
 
          (e) a Debenture or coupon held by an individual who at the time of his
     death is not a citizen or resident of the United States will not be subject
     to United States Federal estate tax as a result of such individual's death,
     provided that (i) the individual does not own, actually or constructively,
     10 percent or more of the total combined voting power of all classes of
     stock of the Company entitled to vote and, (ii) at the time of such
     individual's death, payments with respect to such Debenture or coupon would
     not have been effectively connected to the conduct by such individual of a
     trade or business in the United States;
 
          (f) shares of Preferred Stock, Class A Special Common Stock, Class A
     Common Stock, or Warrants held by an individual at the time of his death
     (or theretofore transferred subject to certain retained rights or powers)
     may be subject to United States federal estate tax unless otherwise
     provided by an applicable tax treaty.
 
     Sections 871(h) and 881(c) of the Code require that, in order to obtain the
portfolio interest exemption from withholding tax described in paragraph (b)
above in the case of a Registered Debenture, either the beneficial owner of the
Debenture or a securities clearing organization, bank or other financial
institution that holds customers' securities in the ordinary course of its trade
or business (a "Financial Institution") and that is holding the Debenture on
behalf of such beneficial owner, files a statement with the withholding agent to
the effect that the beneficial owner of the Debenture is not a United States
Holder. Under temporary United States Treasury Regulations, such requirement
will be fulfilled if the beneficial owner of a Debenture certifies on Internal
Revenue Service Form W-8, under penalties of perjury, that it is not a United
States Holder and provides its name and address, and any Financial Institution
holding the Debenture on behalf of the beneficial owner, files a statement with
the withholding agent to the effect that it has received such a statement from
the Holder (and furnishes the withholding agent with a copy thereof).
 
     If a United States Alien Holder of Securities is engaged in a trade or
business in the United States, and if interest (including original issue
discount) or dividends on such Securities is effectively connected with the
conduct of such trade or business, the United States Alien Holder, although
exempt from the withholding tax discussed in paragraphs (b) and (c) above, will
generally be subject to regular United States income tax on interest (including
any original issue discount) or dividends on such Securities and on any gain
realized on the sale, exchange or other disposition of such Securities in the
same manner as if it were a United States Holder. See "Tax Consequences to
United States Holders" above. Such a Holder will be required to provide to the
Company a properly executed Internal Revenue Service Form 4224 in order to claim
an exemption from withholding tax. In addition, if such United States Alien
Holder is a foreign corporation, it may be subject to a branch profits tax equal
to 30% of its effectively connected earnings and profits for the taxable year,
subject to certain adjustments. For purposes of the branch profits tax, interest
(including original issue discount) on dividends on and any gain recognized on
the sale, exchange or other disposition of a Debenture or shares of Class A
Common Stock, Class A Special Common Stock or Preferred Stock or Warrants will
 
                                       24
<PAGE>   29
 
be included in the earnings and profits of such United States Alien Holder if
such income is effectively connected with the conduct by the United States Alien
Holder of a trade or business in the United States.
 
CERTAIN FIRPTA CONSIDERATIONS
 
     Under the Foreign Investment in Real Property Tax Act of 1980, as amended
("FIRPTA"), foreign persons generally are subject to United States federal
income tax on capital gain realized on the disposition of any interest (other
than solely as a creditor) in a corporation that is a United States real
property holding corporation (a "USRPHC"). For this purpose, a foreign person is
defined as any Holder who is a foreign corporation (other than certain foreign
corporations that elect to be treated as domestic corporations), a non-resident
alien individual, a non-resident fiduciary of a foreign estate or trust, or a
foreign partnership. Under FIRPTA, a corporation is a USRPHC if the fair market
value of the United States real property interests held by the corporation is 50
percent or more of the aggregate fair market value of the corporation's real
property interests and other assets used or held for use in the corporation's
trade or business, excluding assets held for future business needs.
 
     The discussion of the U.S. federal tax consequences to United States Alien
Holders set forth above assumes that none of the Securities will be considered
interests in a USRPHC. No opinion is expressed as to whether the Company is
currently or will become a USRPHC. If the Company were treated as a USRPHC,
United States Alien Holders could be subject to United States federal income tax
on gain or income, if any, realized on the sale or other disposition of
convertible Debentures, Preferred Stock, Class A Common Stock, Class A Special
Common Stock, or Warrants. However, gain realized on a disposition of stock in a
USRPHC by a Holder that is not deemed to own more than five percent of such
stock during the shorter of the five-year period preceding such disposition or
such Holder's holding period will not be subject to United States federal income
tax provided that such stock is "regularly traded on an established securities
market" (within the meaning of section 897(c)(3) of the Code) at the time of
disposition.
 
     The transferee of an interest in a USRPHC is under a duty to withhold
(generally at a rate of 10% of the amount realized by the transferor) if the
transferor is a foreign person. Accordingly, if the Company were to determine
that it may be or may have been a USRPHC, in the case of conversion, redemption
or repurchase of any Debenture convertible into stock of the Company, or of
Preferred Stock, Class A Special Common Stock, Class A Common Stock, or Warrants
to purchase any such Securities, the Company intends to withhold to the extent
required in the case of a foreign transferor unless the Holder furnishes to the
Company a certification that (i) states that the Holder is not a foreign holder,
(ii) sets forth such person's name, identifying number and home address (in the
case of an individual) or office address (in the case of an entity), and (iii)
is signed under penalties of perjury. Any amount withheld pursuant to these
rules will be creditable against such foreign person's United States federal
income tax liability and may entitle such person to a refund, provided that the
required information is furnished to the IRS.
 
     BACKUP WITHHOLDING AND INFORMATION REPORTING
 
     United States Alien Holders of Securities should consult their tax advisors
regarding the application of information reporting and backup withholding in
their particular situations, the availability of an exemption therefrom, and the
procedure for obtaining such an exemption, if available. Any amounts withheld
from a payment to a Holder under the backup withholding rules will be allowed as
a credit against such Holder's United States Federal income tax liability and
may entitle such Holder to a refund, provided that the required information is
furnished to the Internal Revenue Service.
 
     THE FOREGOING DISCUSSION OF CERTAIN FEDERAL INCOME TAX CONSEQUENCES IS FOR
GENERAL INFORMATION ONLY AND IS NOT TAX ADVICE. ACCORDINGLY, EACH PROSPECTIVE
PURCHASER OF SECURITIES SHOULD CONSULT HIS OWN TAX ADVISOR WITH RESPECT TO THE
TAX CONSEQUENCES OF THE ACQUISITION, OWNERSHIP AND DISPOSITION OF SUCH
SECURITIES, INCLUDING THE APPLICABILITY AND EFFECT OF
 
                                       25
<PAGE>   30
 
STATE, LOCAL AND FOREIGN TAX LAWS, AND OF CHANGES IN APPLICABLE TAX LAWS.
PROSPECTIVE PURCHASERS SHOULD ALSO CAREFULLY REVIEW EACH PROSPECTUS SUPPLEMENT
FOR ADDITIONAL AND/OR UPDATED INFORMATION REGARDING THE TAX CONSEQUENCES OF THE
SECURITIES DESCRIBED THEREIN.
 
                              PLAN OF DISTRIBUTION
 
     The Company may sell Securities on a negotiated or competitive bid basis to
or through underwriters or dealers, and also may sell Securities directly to
other purchasers or through agents. Any such underwriter, dealer or agent
involved in the offer and sale of Securities, and any applicable commissions,
discounts and other items constituting compensation to such underwriters, dealer
or agent, will be set forth in the Prospectus Supplement.
 
     The distribution of Securities may be effected from time to time in one or
more transactions at a fixed price or prices, which may be changed, or at market
prices prevailing at the time of sale, at prices related to such prevailing
market prices or at negotiated prices.
 
     Unless otherwise indicated in a Prospectus Supplement, the obligations of
any underwriters to purchase Securities will be subject to certain conditions
precedent and the underwriters will be obligated to purchase all of the
applicable Securities if any are purchased. If a dealer is utilized in the sale,
the Company will sell the Securities to the dealer as principal. The dealer may
then resell the Securities to the public at varying prices to be determined by
such dealer at the time of resale.
 
     Offers to purchase Securities may be solicited by the Company or agents
designated by the Company from time to time. Unless otherwise indicated in a
Prospectus Supplement, any such agent will be acting on a best efforts basis for
the period of its appointment.
 
     Underwriters, dealers and agents that participate in the distribution of
Securities may be deemed to be underwriters as that term is defined in the
Securities Act of 1933 (the "Securities Act"), and any discounts or commissions
received by them from the Company and any profits on the resale of the
Securities by them may be deemed to be underwriting discounts and commissions
under the Securities Act. Underwriters, dealers and agents may be entitled,
under agreements entered into with the Company, to indemnification against and
contribution toward certain civil liabilities, including liabilities under the
Securities Act.
 
     If so indicated in the Prospectus Supplement, the Company will authorize
agents and underwriters to solicit offers by certain specified institutions to
purchase Securities from the Company at the public offering price set forth in
the Prospectus Supplement pursuant to delayed delivery contracts providing for
payment and delivery on a specified date in the future. Institutions with whom
such contracts, when authorized, may be made include commercial and savings
banks, insurance companies, pension funds, investment companies, educational and
charitable institutions and other institutions but shall in all cases be subject
to the approval of the Company. Such contracts will be subject only to those
conditions set forth in the Prospectus Supplement and the Prospectus Supplement
will set forth the commission payable for solicitation of such contracts.
 
                                       26
<PAGE>   31
 
                                 LEGAL OPINIONS
 
     The legality of the securities offered hereby will be passed upon for the
Company by Arthur R. Block, Esquire, Deputy General Counsel of the Company, and
for any underwriters or agents by Latham & Watkins, Chicago, Illinois.
 
                                    EXPERTS
 
     The consolidated financial statements of Comcast Corporation and
subsidiaries incorporated in this prospectus by reference from the Company's
Annual Report on Form 10-K for the year ended December 31, 1992 have been
audited by Deloitte & Touche, independent auditors, as stated in their report
which is incorporated herein by reference, and has been so incorporated in
reliance upon the report of such firm as experts in accounting and auditing.
 
     The consolidated financial statements and schedules of Storer
Communications, Inc. and subsidiaries as of December 31, 1992 and 1991 and for
each of the years in the three year period ended December 31, 1992, included as
an exhibit to the Annual Report on Form 10-K of Comcast Corporation for the
fiscal year ended December 31, 1992 and incorporated by reference in this
Prospectus have been incorporated by reference herein in reliance upon the
report of KPMG Peat Marwick, independent certified public accountants,
incorporated by reference herein, and upon the authority of said firm as experts
in auditing and accounting.
 
                                       27
<PAGE>   32
 
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  No dealer, salesperson or any other person has been authorized to give any
information or to make any representations not contained in this Prospectus
Supplement, or the accompanying Prospectus and, if given or made, such
information or representations must not be relied upon as having been authorized
by the Company, by the Underwriter or by any other person. This Prospectus
Supplement and the accompanying Prospectus do not constitute an offer to sell or
a solicitation of an offer to buy any of the securities offered hereby to any
person or by anyone in any state in which such offer or solicitation may not
lawfully be made. Neither the delivery of this Prospectus Supplement and the
accompanying Prospectus, nor any sale made hereunder, shall, under any
circumstances, create any implication that the information contained herein is
correct as of any time subsequent to the date hereof.
                            ------------------------
 
                               TABLE OF CONTENTS
 
                             PROSPECTUS SUPPLEMENT
 
<TABLE>
<CAPTION>
                                        PAGE
                                        -----
<S>                                     <C>
Certain Considerations................    S-2
The Company...........................    S-2
Use of Proceeds.......................    S-2
Description of the Debentures.........    S-3
Underwriting..........................    S-3
Experts...............................    S-4
 
PROSPECTUS
 
Incorporation of Certain Documents by
  Reference...........................      2
Available Information.................      3
The Company...........................      4
Certain Considerations................      4
Use of Proceeds.......................      4
Dividend Policy.......................      5
Ratio of Earnings to Combined Fixed
  Charges and Preferred Stock
  Dividends...........................      5
Description of Debentures.............      6
Description of Preferred Stock........     13
Description of Depositary Shares......     14
Description of Common Stock...........     16
Description of Warrants...............     17
United States Taxation................     18
Plan of Distribution..................     25
Legal Opinions........................     27
Experts...............................     27
</TABLE>
 
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- ------------------------------------------------------
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                                  $250,000,000
 
                              [COMCAST CORP. LOGO]
 
                           9 3/8% SENIOR SUBORDINATED
                              DEBENTURES DUE 2005
 
                            ------------------------
                             PROSPECTUS SUPPLEMENT
                                  MAY 16, 1995
                            ------------------------
                                LEHMAN BROTHERS
 
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