EXHIBIT 10.49

                               SECURED PROMISSORY NOTE


                                                          August 11, 1999

$69,300.00                                        Marlboro, Massachusetts

     FOR VALUE RECEIVED Peter T. Johnson and Andrea R. Johnson, who reside at
14 Brook Street, North Walpole, MA  02081 (collectively and individually the
"Maker"), jointly and severally promise to pay to Viewlogic Systems, Inc., or
order, at the offices of Viewlogic Systems, Inc. in Marlboro, Massachusetts,
or at such other place as the holder of this Note may designate in writing,
the principal sum of $69,300.00, without interest.  The entire unpaid
principal amount of this Note shall be due and payable on the earliest of the
following dates:

     a.   The date which is the seventh anniversary of the date of this Note.
     b.   The date which is eighteen months after the first date, if any, on
          which the common stock of Viewlogic Systems, Inc. (or any security
          substituted therefor) is listed on a national securities exchange
          or the NASDAQ stock market.
     c.   Immediately upon the occurrence of an Event of Default
          hereunder or as defined in the Stock Pledge Agreement referenced
          below.
     d.   The date which is three months after the termination of the Maker's
          employment with the Company for any reason or no reason.
     e.   The date which is one month before the Final Exercise Date, as
          defined in the option agreement between the Maker and the Company
          under which the Maker acquired the collateral securing this Note.

All payments by the Maker under this Note shall be in immediately available
funds.

     Payment of this Note is secured by a security interest in certain shares of
common stock of Viewlogic Systems, Inc. owned by the Maker (the "Collateral")
pursuant to a stock pledge agreement of even date herewith between the Maker and
Viewlogic Systems, Inc. (the "Stock Pledge Agreement").

     Upon the occurrence of an Event of Default hereunder or as defined in the
Stock Pledge Agreement, the holder shall have then, or at any time thereafter,
all of the rights and remedies afforded by the Uniform Commercial Code as from
time to time in effect in the Commonwealth of Massachusetts or afforded by other
applicable law, subject to the limitations set forth is this Note or the Stock
Pledge Agreement relating to the liability of the Maker for payment of any
deficiency due hereunder or under the Stock Pledge Agreement.


     Notwithstanding anything to the contrary in this Note, the Stock Pledge
Agreement or


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otherwise, Viewlogic Systems, Inc. and each other holder of this Note
acknowledge and agree that the entire liability and obligation of the Maker
under, or in connection with, this Note is limited to the surrender of the
Collateral, plus, if the value of the Collateral at the time of any surrender
thereof is not sufficient to satisfy Maker's then outstanding liabilities and
obligations under this Note, the payment, in cash or by bank or certified
check, of an amount equal to the lesser of (a) one half of the original
principal amount of this Note and (b) the entire amount remaining unpaid
under this Note after applying the value of the Collateral.

     No reference in this Note to the Stock Pledge Agreement or any guaranty
shall impair the obligation of the Maker to pay all amounts due under this
Note strictly in accordance with the terms of this Note.

     No delay or omission on the part of the holder in exercising any right
under this Note or the Stock Pledge Agreement shall operate as a waiver of
such right or of any other right of such holder, nor shall any delay,
omission or waiver on any one occasion be deemed a bar to or waiver of the
same or any other right on any future occasion.  The Maker and every endorser
or guarantor of this Note regardless of the time, order or place of signing
waives presentment, demand, protest and notices of every kind (except as
expressly set forth in this Note or the Stock Pledge Agreement) and assents
to any extension or postponement of the time of payment or any other
indulgence, to any substitution, exchange or release of Collateral, and to
the addition or release of any other party or person primarily or secondarily
liable.

     This Note may be prepaid in whole or in part at any time or from time to
time.  Any such prepayment shall be without premium or penalty.  Immediately
upon the payment or prepayment in whole of this Note, the Collateral shall be
released to Maker, free and clear of all liens, encumbrances and security
interests created or held by holder.

     None of the terms or provisions of this Note may be excluded, modified
or amended except by a written instrument duly executed on behalf of the
Maker and the holder, expressly referring to this Note and setting forth the
provision so excluded, modified or amended.

     All rights and obligations hereunder shall be governed by the laws of
the Commonwealth of Massachusetts, excluding its rules regarding conflict of
laws, and this Note is executed as an instrument under seal.


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ATTEST:                               MAKER

By: /s/ Diane E. Brewer               /s/ Peter T. Johnson
   -------------------------         ------------------------------
Title:                               Print Name: Peter T. Johnson
      ----------------------                    -------------------

ATTEST:                               MAKER

By: /s/ James A. Radley               /s/ Andrea R. Johnson
   -------------------------         ------------------------------
Title:                                Print Name: Andrea Johnson
      ----------------------                     ------------------


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