FORSTMANN LITTLE & CO SUB DEBT & EQU MGMT BYOUT PART IV/INST
SC 13D/A, 1999-04-05
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                SECURITIES AND EXCHANGE COMMISSION
                     Washington, D. C. 20549

                          --------------


                           SCHEDULE 13D
   Under the Securities Exchange Act of 1934 (Amendment No. 4)*


 General Instrument Corporation (formerly NextLevel Systems, Inc.)
- -------------------------------------------------------------------------------
                         (Name of Issuer)


             Common Stock, par value $0.01 per share
- -------------------------------------------------------------------------------
                  (Title of Class of Securities)


                            370120107
          ----------------------------------------------
                          (CUSIP Number)



Fried, Frank, Harris, Shriver & Jacobson    Forstmann Little & Co. Subordinated
      One New York Plaza                      Debt and Equity Management Buyout
      New York, NY  10004                     Partnership-IV
      Attn:  Aviva Diamant, Esq.            Instrument Partners
      (212) 859-8000                            c/o Forstmann Little & Co.
                                                767 Fifth Avenue
                                                New York, NY  10153
                                                Attn:  Steven B. Klinsky
                                                (212) 355-5656

- -------------------------------------------------------------------------------
 (Name, Address and Telephone Number of Person Authorized to Receive
                   Notices and Communications)


                          April 5, 1999
          ---------------------------------------------
     (Date of Event which Requires Filing of this Statement)

      If the filing  person has  previously  filed a statement on
Schedule  13G to report the  acquisition  that is the  subject of
this Schedule  13D, and is filing this  schedule  because of Rule
13d-1(e), 13d-1(f) or 13d-1(g), check the following box [ ].

           Note:  Schedules filed in paper format shall include a
      signed original and five copies of the schedule,  including
      all  exhibits.  See Rule 13d-7(b) for other parties to whom
      copies are to be sent.

                       (Continued on following pages)

- --------------
     *The  remainder of this cover page shall be filled out for a reporting
person's  initial  filing on this form with respect to the subject class of
securities,  and for any subsequent amendment containing  information which
would alter disclosures provided in a prior cover page.

     The information required on the remainder of this cover page shall not
be deemed to be "filed"  for the  purpose  of Section 18 of the  Securities
Exchange  Act of 1934 ("Act") or otherwise  subject to the  liabilities  of
that section of the Act but shall be subject to all other provisions of the
Act (however, see the Notes).
<PAGE>
                             SCHEDULE 13D

CUSIP No. 370120107                           Page 2 of 8 Pages

1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

    FORSTMANN LITTLE & CO. SUBORDINATED DEBT AND EQUITY MANAGEMENT BUYOUT
     PARTNERSHIP-IV

2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*    (a)  [ ]
                                                         (b)  [X]

3   SEC USE ONLY

4   SOURCE OF FUNDS*

    00

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
    PURSUANT TO ITEMS 2(d) or 2(e)                           [ ]

6   CITIZENSHIP OR PLACE OF ORGANIZATION

    NEW YORK

  NUMBER OF      7  SOLE VOTING POWER

   SHARES           1,001,092

 BENEFICIALLY    8  SHARED VOTING POWER

OWNED BY EACH       0

 REPORTING       9  SOLE DISPOSITIVE POWER

PERSON WITH         1,001,092

                10  SHARED DISPOSITIVE POWER

                    0

11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,001,092

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)             [ ]
    EXCLUDES CERTAIN SHARES*

13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.58%

14  TYPE OF REPORTING PERSON*

    PN


                 *SEE INSTRUCTIONS BEFORE FILLING OUT!

                             SCHEDULE 13D

CUSIP No. 370120107                           Page 3 of 8 Pages

1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

    INSTRUMENT PARTNERS

2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*    (a)  [ ]
                                                         (b)  [X]

3   SEC USE ONLY

4   SOURCE OF FUNDS*

    00

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
    PURSUANT TO ITEMS 2(d) or 2(e)                           [ ]

6   CITIZENSHIP OR PLACE OF ORGANIZATION

    NEW YORK

  NUMBER OF      7  SOLE VOTING POWER

   SHARES           1,137,573

 BENEFICIALLY    8  SHARED VOTING POWER

OWNED BY EACH       0

 REPORTING       9  SOLE DISPOSITIVE POWER

PERSON WITH         1,137,573

                10  SHARED DISPOSITIVE POWER

                    0

11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,137,573

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)             [ ]
    EXCLUDES CERTAIN SHARES*

13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    .66%

14  TYPE OF REPORTING PERSON*

    PN


                 *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

     This Amendment No. 4 amends and  supplements the Statement on Schedule
13D (the "Schedule  13D") relating to the common stock,  par value $.01 per
share (the "Common Stock"), of General Instrument  Corporation,  a Delaware
corporation (the "Company"), previously filed by Instrument Partners, a New
York limited partnership,  and Forstmann Little & Co. Subordinated Debt and
Equity Management Buyout Partnership-IV ("MBO-IV"; together with Instrument
Partners, the "Partnerships"), a New York limited partnership.  Capitalized
terms used and not defined in this Amendment have the meanings set forth in
the Schedule 13D.

     Except as specifically provided herein, this Amendment does not modify
any of the information previously reported on the Schedule 13D.

ITEM 4.  Purpose of the Transaction
         --------------------------

Item 4 is hereby amended and supplemented as follows:

          On April 5, 1999, Instrument Partners and MBO-IV sold 2,819,111
shares and 2,480,889 shares, respectively, of Common Stock to the Company
at a purchase price of $28.00 per share (the "Company Sales"). The
agreement pursuant to which such sales took place (the "Company Agreement")
is filed as Exhibit 4 to this Schedule 13D and incorporated herein by
reference.

          On April 5, 1999, Instrument Partners and MBO-IV sold 5,319,078
shares and 4,680,922 shares, respectively, of Common Stock to Liberty Media
Corporation, a Delaware corporation ("Liberty Media"), at a purchase price
of $28.00 per share (the "Liberty Sales"). The agreement pursuant to which
such sales took place (the "Liberty Agreement") is filed as Exhibit 5 to
this Schedule 13D and incorporated herein by reference.

          On April 5, 1999, Instrument Partners and MBO-IV sold 2,271,246
shares and 1,998,754 shares, respectively, of Common Stock to Goldman,
Sachs & Co. ("Goldman Sachs"), at a purchase price of $28.25 per share, in
transactions pursuant to Rule 144 under the Securities Act of 1933 (the
"Goldman Sachs Sales").

          Effective April 5, 1999, Theodore J. Forstmann, a general partner
of the general partner of each of the Partnerships, resigned from the Board
of Directors of the Company.

          On April 5, 1999, the Partnerships delivered a letter to the
Company requesting the Company to apply to the Securities and Exchange
Commission for withdrawal of the Registration Statement filed on August 26,
1998. Subject to compliance with the Liberty Media Agreement (see item 6
below), the Partnerships plan to dispose of the remainder of their holdings
of Common Stock through open market transactions, block trades, privately
negotiated transactions, or otherwise.

          ITEM 5. Interest in Securities of the Issuer
                  ------------------------------------

Item 5 is hereby amended and supplemented as follows:

     (i) Instrument Partners:

          (a) Amount Beneficially Owned:

          Instrument Partners owns 1,137,573 shares of Common Stock,
representing approximately .66% of the Common Stock as of April 5, 1999.

          (b) Number of shares as to which such person has:

               (i) sole power to vote or to direct the vote -- 1,137,573.

               (ii) shared power to vote or to direct the vote - none.

               (iii) sole power to dispose or to direct the disposition of
                     -- 1,137,573.

               (iv) shared power to dispose or to direct the disposition of
                    - none.


     (ii) MBO-IV:

          (a) Amount Beneficially Owned:

          MBO-IV owns 1,001,092 shares of Common Stock, representing
approximately .58% of the Common Stock as of April 5, 1999.

          As a result of the merger of FLC Partnership, L.P. with and into
FLC XXIX Partnership, L.P., a New York limited partnership ("FLC XXIX"),
FLC XXIX is the general partner of MBO-IV and, accordingly, may be deemed
to share beneficial ownership of the shares of Common Stock owned by
MBO-IV, but specifically disclaims any such beneficial ownership pursuant
to Rule 13d-4. Theodore J. Forstmann, Nicholas C. Forstmann, Steven B.
Klinsky, Winston W. Hutchins, Sandra J. Horbach, Thomas H. Lister, and
Tywana LLC, a North Carolina limited liability company, are the general
partners of FLC XXIX. Pursuant to the FLC XXIX Partnership Agreement,
however, Ms. Horbach, Mr. Lister and Tywana LLC have no economic, voting,
dispositive or other beneficial ownership of any shares of Common Stock of
the Company owned by MBO-IV. Each of Messrs. Theodore J. Forstmann,
Nicholas C. Forstmann, Steven B. Klinsky and Winston W. Hutchins may be
deemed to share beneficial ownership of the shares of Common Stock owned by
MBO-IV, but specifically disclaim any such beneficial ownership pursuant to
Rule 13d-4.

          (b) Number of shares as to which such person has:

               (i) sole power to vote or to direct the vote -- 1,001,092.

               (ii) shared power to vote or to direct the vote - none.

               (iii) sole power to dispose or to direct the disposition of
                     -- 1,001,092.

               (iv) shared power to dispose or to direct the disposition of
                    - none.

          (iii) In the past sixty days, the Partnerships sold a total of
19,570,000 shares in the following transactions:

   Reporting Person     Date        Number of Shares      Price per Share
   ----------------     ----        ----------------      ---------------

   Instrument Partners  4/5/99            2,819,111         $28.00(1)

   MBO-IV               4/5/99            2,480,889         $28.00(1)

   Instrument Partners  4/5/99            5,319,078         $28.00(2)

   MBO-IV               4/5/99            4,680,922         $28.00(2)

   Instrument Partners  4/5/99            2,271,246         $28.25(3)

   MBO-IV               4/5/99            1,998,754         $28.25(3)



     (1) Pursuant to the Company Agreement.

     (2) Pursuant to the Liberty Agreement.

     (3) Sold to Goldman Sachs pursuant to Rule 144 under the Securities
         Act.



     (iv) On April 5, 1999, each of Investment Partners and MBO-IV ceased
to be the beneficial owner of more than five percent to the shares of
Common Stock of the Company.

ITEM 6. Contracts, Arrangements, Understandings or Relationships With
        Respect to Securities of the Issuer.
        -------------------------------------------------------------

Item 6 is hereby amended and supplemented as follows:

          Pursuant to the Company Agreement, the Partnerships executed and
     delivered to the Company irrevocable proxies to vote at the Company's
     1999 annual meeting of stockholders 9.57 million of the shares of
     Common Stock held by the Partnerships on March 31, 1999, the record
     date for such annual meeting.

          Pursuant to the Liberty Agreement, (A) the Partnerships executed
     and delivered irrevocable proxies granting Liberty Media the right to
     vote the 10 million shares of Common Stock purchased by it from the
     Partnerships at the Company's 1999 annual meeting of stockholders, (B)
     the Partnerships assigned to Liberty Media certain of their rights and
     obligations under the Registration Rights Agreement, dated as of April
     6, 1992, among MBO-IV, Instrument Partners, General Instrument
     Corporation, a Delaware corporation (the former parent of the
     Company), and GI Corporation, a Delaware corporation, and the Letter
     Agreement, dated July 25, 1997, between the Company, MBO-IV and
     Instrument Partners, (C) the Partnerships agreed that until July 5,
     1999, the Partnerships would not sell any shares of Company Common
     Stock except for the Company Sales, the Liberty Sales and the Goldman
     Sachs Sales (collectively, the "Sales") and except for Block Sale
     Transactions (as defined below), and (D) Liberty Media waived its
     right of first refusal with respect to (i) each of the Sales, (ii)
     Block Sale Transactions taking place prior to July 5, 1999, and (iii)
     sales in broker transactions or to a market maker taking place on or
     after July 5, 1999 at a price per share of at least $28.00. In
     addition, Liberty Media modified its right of first refusal with
     respect to sales by the Partnerships in the open market at prices of
     less than $28.00 per share. A Block Sale Transaction is defined in the
     Liberty Agreement as any sale by the Partnerships of not less than
     200,000 shares of Common Stock in one transaction or a series of
     transactions taking place on a single trading day (a) pursuant to a
     sell order placed with a single brokerage firm, (b) to a single
     market-maker, or (c) to any institutional investor, in each case, at a
     price per share of not less than $28.00.

          Any descriptions of contracts, arrangements, understandings or
     relationships with respect to securities of the Company contained
     herein are not intended to be complete, and are qualified in their
     entirety by the complete text of the agreement. The Company Agreement
     and the Liberty Agreement are filed as Exhibits 4 and 5 hereto,
     respectively, and are incorporated herein by reference.


ITEM 7.  Material to be Filed as Exhibits.
         --------------------------------

Item 7 is hereby amended and supplemented as follows:

         4.    Agreement,  dated  as  of  April  2,  1999,  among
               MBO-IV, Instrument Partners and the Company.

         5.    Agreement,  dated  as  of  April  2,  1999,  among
               MBO-IV, Instrument Partners and Liberty Media.
<PAGE>
                                  SIGNATURE
                                  ---------

          After reasonable inquiry and to the best of my knowledge and
     belief, I certify that the information set forth in this statement is
     true, complete and correct.


Dated:  April 5, 1999         INSTRUMENT PARTNERS


                              By:   FLC XXII Partnership,
                                    its general partner



                              By:   /s/ Steven B. Klinsky
                                    ---------------------
                                    Steven B. Klinsky,
                                    a general partner

                              FORTSMANN LITTLE & CO. SUBORDINATED DEBT AND
                                 EQUITY MANAGEMENT BUYOUT PARTNERSHIP-IV


                              By:   FLC XXIX Partnership, L.P.,
                                    its general partner


                              By:   /s/ Steven B. Klinsky   
                                    ----------------------
                                    Steven B. Klinsky,
                                    a general partner

                                                                  Exhibit 4

                        STOCK DISPOSITION AGREEMENT


     Stock  Disposition  Agreement,   dated  as  of  April  2,  1999  (this
"Agreement"),  among General Instrument Corporation, a Delaware corporation
(the  "Company"),  Instrument  Partners,  a New  York  limited  partnership
("Instrument  Partners"),  and Forstmann Little & Co. Subordinated Debt and
Equity Management  Buyout  Partnership-IV,  a New York limited  partnership
("MBO-IV";   and   together   with   Instrument   Partners,   the  "Selling
Stockholders").

     WHEREAS,  Instrument Partners is the owner of 11,547,008 shares of the
Company's common stock, par value $.01 per share (the "Common Stock"),  and
MBO-IV is the owner of 10,161,657 shares of Common Stock; and

     WHEREAS, the Company desires to purchase from Instrument Partners, and
Instrument Partners desires to sell to the Company, 2,819,111 of its shares
of Common  Stock;  and the Company  desires to purchase  from  MBO-IV,  and
MBO-IV  desires to sell to the  Company,  2,480,889 of its shares of Common
Stock (such  Instrument  Partners and MBO-IV  shares of Common  Stock,  the
"Shares"); and

     WHEREAS,  contemporaneously  with the  execution  and delivery of this
Agreement,  the Selling  Stockholders  are entering into an agreement  (the
"Other Agreement") to sell 10 million of their other shares of Common Stock
to Liberty Media Corporation, a Delaware corporation ("Liberty Media").

     NOW,   THEREFORE,   in  consideration  of  the  mutual  covenants  and
undertakings  contained  herein,  and  on  the  terms  and  subject  to the
conditions set forth herein,  the parties hereto,  each representing to the
others that its execution,  delivery and  performance of this Agreement has
been fully and duly authorized, agree as follows:


                          SECTION 1 - DEFINITIONS
                          -----------------------

     1.1  SPECIFIC  DEFINITIOS.  As used in this  Agreement,  the following
terms shall have the meanings set forth below:

          "Business Day" - any day other than a Saturday, a Sunday or a day
     on which banks in New York City are  authorized or obligated by law or
     executive order to close.

          "Closing" - the closing of the purchase and sale of the Shares.

          "Closing Date" - the date on which the Closing occurs.

          "Governmental  Entity" - any  federal,  state or local  judicial,
     legislative, executive or regulatory authority.

Other terms are defined  elsewhere in this Agreement and, unless  otherwise
indicated, shall have such meanings throughout this Agreement.


                       SECTION 2 - PURCHASE AND SALE
                       -----------------------------

     2.1  PURCHASE  AND SALE OF  SHARES.  On the terms and  subject  to the
conditions,  and in reliance on the  representations  and  warranties,  set
forth  herein,  at the  Closing  the  Selling  Stockholders  shall sell and
transfer to the Company,  and the Company  shall  purchase from the Selling
Stockholders,  the Selling  Stockholders'  Shares  (2,819,111 Shares in the
case of Instrument  Partners,  and 2,480,889 Shares in the case of MBO-IV),
at a cash purchase price equal to $28.00 per Share (the "Purchase  Price").
The aggregate Purchase Price is $148,400,000.

     2.2  CLOSING; DELIVERY AND PAYMENT.

          (a) The Closing shall take place at the offices of Fried,  Frank,
Harris,  Shriver & Jacobson,  One New York Plaza, New York, New York, or at
such other place as the Selling  Stockholders  and the Company shall agree,
at 9:00 a.m.  (eastern  standard  time) on April 5, 1999 (provided that the
conditions set forth in Sections  4.1(c),  4.1(d)(i),  4.2(c) and 4.2(e)(i)
hereof shall have been  satisfied)  or as soon  thereafter  as  practicable
after such conditions have been satisfied.

          (b) On the Closing Date, each of the Selling  Stockholders  shall
deliver to the Company such instruments of transfer,  in form and substance
reasonably  satisfactory to the Company, as shall be sufficient to transfer
its Shares to the Company,  and in exchange  therefor  (and upon receipt of
confirmation  from  the  Company's  transfer  agent of its  receipt  of the
instruments  of transfer to be  delivered  to it) the Company  shall pay to
each of the  Selling  Stockholders  the  aggregate  Purchase  Price for the
Shares sold by such Selling Stockholders in immediately  available funds to
the accounts designated by such Selling Stockholders.


                 SECTION 3 - REPRESENTATIONS AND WARRANTIES
                 ------------------------------------------

     3.1 BY THE PARTIES. Instrument Partners and MBO-IV each represents and
warrants  to the  Company,  and the  Company  represents  and  warrants  to
Instrument Partners and MBO-IV, as follows:

          (a) It has all necessary  authority for the  execution,  delivery
and performance of this Agreement by it; it has duly executed and delivered
this  Agreement;  and  this  Agreement  is  a  valid  and  legally  binding
agreement,  enforceable  against it in accordance with its terms,  assuming
the due execution and delivery by the other parties; and

          (b) The  performance  of this Agreement by it will not violate or
conflict with any law,  regulation,  order or agreement,  or, to the extent
applicable,  such party's charter or organic  documents,  and such party is
not required to obtain any  governmental  approvals or third party consents
to enter into and perform its obligations pursuant to this Agreement.  Such
execution and performance  does not and will not constitute a default under
any  agreement or obligation  binding on it or result in the  forfeiture or
loss of any rights or assets by it except as  specifically  provided for in
this Agreement.

     3.2 BY THE  SELLING  STOCKHOLDERS.  Each of the  Selling  Stockholders
represents  and  warrants  to the  Company  that  (a) it is  the  owner  of
11,547,008 shares of Common Stock (in the case of Instrument  Partners) and
10,161,657  shares of Common Stock (in the case of MBO-IV),  (b) the Shares
to be sold  hereunder by it are owned,  and will at the Closing be conveyed
to the Company,  by such Selling  Stockholder  free and clear of any liens,
charges or  encumbrances  and (c) upon delivery of its Shares,  and payment
therefor  pursuant hereto,  good and valid title to its Shares will pass to
the Company  (assuming  that the  Company is without  notice of any adverse
claim, as defined in the Uniform Commercial Code as adopted in the State of
New York  (the  "Code")  and is  otherwise  a bona fide  purchaser  for the
purposes of the Code).

     3.3 NO  OTHER  WARRANTIES.  Except  as  expressly  set  forth  in this
Agreement, no party is relying on any express or implied representations or
warranties relating to any party or to the consummation of the transactions
contemplated  hereby.  Except as and to the extent  expressly  set forth in
this  Agreement,  each party hereto  hereby  disclaims  all  liability  and
responsibility  for any  statement  or  information  made  or  communicated
(orally  or in  writing)  to any  other  party  hereto  or  any  affiliate,
representative or agent thereof  (including without limitation any opinion,
information  or advice by any  officer,  director,  consultant,  affiliate,
representative or agent of the disclaiming party).


        SECTION 4 - CONDITIONS TO THE PARTIES' OBLIGATIONS TO CLOSE
        -----------------------------------------------------------

     4.1 CONDITIONS TO THE OBLIGATIONS OF INSTRUMENT PARTNERS AND MBO-IV TO
CLOSE. The obligations of Instrument  Partners and MBO-IV to consummate the
transactions contemplated by this Agreement are subject to the satisfaction
(or waiver) of the following conditions:

          (a) No  Injunctions.  There  shall not be in effect any  statute,
regulation, order, decree or judgment of any Governmental Entity that makes
illegal or enjoins or prevents in any material  respect the consummation of
the transactions contemplated by this Agreement.

          (b)  Representations.  All representations made by the Company in
Article III hereof  shall be true and correct in all  material  respects at
and as of the Closing Date.

          (c)  Liberty  Media  Right of First  Refusal.  Liberty  Media (as
assignee  of TCI  Ventures  Group,  LLC),  shall have waived in writing its
rights of first refusal,  with respect to the transactions  contemplated by
this  Agreement,  under the  letter  agreement,  dated  August 1, 1998 (the
"Letter  Agreement"),  among TCI Ventures Group, LLC, Instrument  Partners,
MBO-IV,  the  Company  and  the  other  party  thereto,   and  the  Selling
Stockholders shall have received a copy of such written waiver.

          (d) Other  Agreement.  (i) All conditions to the  consummation of
the  transactions  contemplated  by the  Other  Agreement  shall  have been
satisfied  or waived and the  parties  thereto  shall be fully  prepared to
consummate the transactions contemplated thereby; and (ii) the transactions
contemplated   by  the  Other   Agreement   shall  have  been   consummated
contemporaneously with the consummation of the transactions contemplated by
this Agreement.

     4.2  CONDITIONS  TO THE  OBLIGATIONS  OF THE  COMPANY  TO  CLOSE.  The
obligations of the Company to consummate the  transactions  contemplated by
this Agreement are subject to the satisfaction (or waiver) of the following
conditions:

          (a) No  Injunctions.  There  shall not be in effect any  statute,
regulation, order, decree or judgment of any Governmental Entity that makes
illegal or enjoins or prevents in any material  respect the consummation of
the transactions contemplated by this Agreement.

          (b)  Representations.  All  representations  made  by  Instrument
Partners  and MBO-IV in Article III hereof shall be true and correct in all
material respects at and as of the Closing Date.

          (c)  Liberty  Media  Right of First  Refusal.  Liberty  Media (as
assignee  of TCI  Ventures  Group,  LLC),  shall have waived in writing its
rights of first refusal,  with respect to the transactions  contemplated by
this  Agreement,  under the Letter  Agreement,  and the Company  shall have
received a copy of such written waiver.

          (d) Fairness  Opinion.  The opinion  previously  delivered to the
board of directors of the Company by Merrill Lynch & Co., that the Purchase
Price is fair to the Company from a financial point of view, shall not have
been withdrawn or adversely modified.

          (e) Other  Agreement.  (i) All conditions to the  consummation of
the  transactions  contemplated  by the  Other  Agreement  shall  have been
satisfied  or waived and the  parties  thereto  shall be fully  prepared to
consummate the transactions contemplated thereby; and (ii) the transactions
contemplated   by  the  Other   Agreement   shall  have  been   consummated
contemporaneously with the consummation of the transactions contemplated by
this Agreement.

          (f) Rule 144  Sale.  Instrument  Partners  or MBO-IV  shall  have
entered into an  arrangement  with  Goldman  Sachs & Co. to sell at least 4
million  of their  shares of Common  Stock  (other  than the Shares and the
shares subject to the Other Agreement) under Rule 144 of the Securities Act
of 1933, as amended,  and the Company shall have received  evidence of such
arrangement reasonably satisfactory to it.

          (g)  Forstmann  Resignation.  Theodore  J.  Forstmann  shall have
resigned his position as a Director of the Company.

          (h) Proxy. Instrument Partners and MBO-IV shall have executed and
delivered  to the  Company an  irrevocable  proxy (in the form of Exhibit A
hereto) to vote 9.57  million of the shares of Common Stock held by them on
March 31, 1999,  the record date for the Company's  1999 annual  meeting of
stockholders, at such annual meeting .


                            SECTION 5 - TERMINATION
                            -----------------------

     5.1 TERMINATION. This Agreement may be terminated at any time prior to
the Closing:

          (a) by written  agreement  of the  Selling  Stockholders  and the
Company;

          (b) either by the  Selling  Stockholders  or by the  Company,  by
written notice of such  termination to the other,  if the Closing shall not
have been  consummated on or prior to 2:00 p.m.  eastern  standard time (in
the case of a termination by the Selling  Stockholders),  or on or prior to
5:00  p.m.  eastern  standard  time  (in the case of a  termination  by the
Company), on April 5, 1999;

          (c) either by the Selling  Stockholders  or by the Company if any
court of competent  jurisdiction  or other  competent  Governmental  Entity
shall have by statute,  rule,  regulation,  order,  decree or injunction or
other action permanently  restrained,  enjoined or otherwise prohibited any
of the transactions contemplated by this Agreement.


                         SECTION 6 - MISCELLANEOUS
                         -------------------------

     6.1 NOTICES.  All notices or other  communications  hereunder shall be
deemed  to have been duly  given  and made if in  writing  and if served by
personal  delivery  upon the party for whom it is  intended,  if  delivered
registered or certified mail,  return receipt  requested,  or by a national
courier  service,  if sent by  facsimile  transmission,  provided  that the
facsimile  transmission  is promptly  confirmed by  telephone  confirmation
thereof,  or on the third day after  posting in the United  States  postage
prepaid if sent by registered or certified mail, return receipt  requested,
to the person at the address set forth below,  or such other address as may
be designated in writing hereafter, in the same manner, by such person:

          To the Company:

          General Instrument Corporation
          101 Tournament Drive
          Horsham, Pennsylvania  19044
          Attention:  Robert A. Scott, Esq.
          Senior Vice President, General Counsel and Secretary
          Tel:  (215) 323-1000
          Fax:  (215) 323-1293
          To Instrument Partners or MBO-IV:

          c/o Forstmann Little & Co.
          767 Fifth Avenue
          New York, New York  10153
          Attention:  Winston W. Hutchins
          Tel:  (212) 355-5656
          Fax:  (212) 759-9059

     6.2 AMENDMENT;  WAIVER. Any provision of this Agreement may be amended
or waived  if, and only if,  such  amendment  or waiver is in  writing  and
signed, in the case of any amendment, by the parties hereto, or in the case
of a waiver,  by the party against whom the waiver is to be  effective.  No
failure or delay by any party in exercising  any right,  power or privilege
hereunder shall operate as a waiver thereof nor shall any single or partial
exercise  thereof  preclude  any other or further  exercise  thereof or the
exercise of any other right,  power or  privilege.  The rights and remedies
herein  provided  shall be  cumulative  and,  except as otherwise  provided
herein, shall not be exclusive of any rights or remedies provided by law.

     6.3  ASSIGNMENT.  No party to this  Agreement  may  assign  any of its
rights or obligations under this Agreement without the consent of the other
parties hereto.

     6.4 ENTIRE  AGREEMENT.  This  Agreement  (which  includes  the Exhibit
hereto) contains the entire agreement among the parties hereto with respect
to the  subject  matter  hereof and  supersedes  all prior  agreements  and
understandings, oral or written, between or among them with respect to such
matters,  and any written agreement of the parties that expressly  provides
that it is not superseded by this Agreement.

     6.5 PARTIES IN INTEREST.  This Agreement shall inure to the benefit of
and be binding upon the parties hereto and their respective  successors and
permitted  assigns.  Nothing  in this  Agreement,  express or  implied,  is
intended to confer upon any person other than the parties hereto, and their
successors or permitted assigns,  any rights or remedies under or by reason
of this Agreement.

     6.6 GOVERNING  LAW:  SUBMISSION TO  JURISDICTION;  SELECTION OF FORUM.
THIS AGREEMENT SHALL BE GOVERNED BY THE LAWS OF THE STATE OF NEW YORK. Each
party hereto agrees that it shall bring any action or proceeding in respect
of  any  claim  arising  out  of  or  related  to  this  Agreement  or  the
transactions  contained in or contemplated  by this  Agreement,  whether in
tort or contract or at law or in equity,  exclusively  in the United States
District  Court for the Southern  District of New York or the Supreme Court
of the  state  of New  York for the  County  of New  York,  and  solely  in
connection  with claims  arising under this  Agreement or the  transactions
contained in or contemplated  by this Agreement (i) irrevocably  submits to
the exclusive  jurisdiction of such courts,  (ii) waives any objection that
such courts are an inconvenient  forum or do not have jurisdiction over any
party  hereto and (iii)  agrees that  service of process upon such party in
any such  action or  proceeding  shall be  effective  if notice is given in
accordance with Section 6.1 of this Agreement.

     6.7  COUNTERPARTS.  This  Agreement  may be  executed  in one or  more
counterparts,  each of which shall be deemed an original,  and all of which
shall constitute one and the same Agreement.

     6.8 FURTHER ASSURANCES.  Each party hereto shall (at its expense) take
such actions and execute and deliver such other  documents,  certifications
and further  assurances as the other parties hereto may reasonably  request
in order to carry out the purposes of this Agreement.

     IN WITNESS WHEREOF, the undersigned have executed this Agreement as of
the date first written above.

                              GENERAL INSTRUMENT CORPORATION


                              By:/s/ Robert A. Scott
                                 ------------------------------------
                                   Name:  Robert A. Scott
                                   Title: Senior Vice President,
                                          General Counsel & Secretary


                              INSTRUMENT PARTNERS

                                By: FLC XXII Partnership, general partner


                                  By:/s/ Steven B. Klinsky
                                     --------------------------------
                                      Name:  Steven B. Klinsky
                                      Title: General Partner


                              FORSTMANN LITTLE & CO. SUBORDINATED
                              DEBT AND EQUITY MANAGEMENT BUYOUT
                              PARTNERSHIP-IV

                                By: FLC XXIX Partnership, L.P., general partner


                                  By:/s/ Steven B. Klinsky
                                     --------------------------------
                                      Name:  Steven B. Klinsky
                                      Title: General Partner

<PAGE>

                                                                     Exhibit A
                             IRREVOCABLE PROXY
                                  FOR THE
                    1999 ANNUAL MEETING OF STOCKHOLDERS
                     OF GENERAL INSTRUMENT CORPORATION
                    -----------------------------------

                               April __, 1999

     The  undersigned  hereby  irrevocably  appoint  Geoffrey  S. Roman and
Richard  C. Smith and each or either of them their  attorneys  and  agents,
with full power of  substitution,  to vote as Proxy for the  undersigned as
herein  stated  at the 1999  Annual  Meeting  of  Stockholders  of  General
Instrument  Corporation (the "Company"),  and at any adjournments  thereof,
according to the number of votes the undersigned  would be entitled to vote
with respect to 9.57 million of their shares of common stock of the Company
(comprised of 5,090,357 of Instrument  Partners'  shares,  and 4,479,643 of
Forstmann  Little & Co.  Subordinated  Debt and  Equity  Management  Buyout
Partnership-IV's  shares) if  personally  present on the  matters set forth
below and in accordance with their discretion on any other matters that may
properly come before the meeting or any adjournments thereof.

     FOR election as Class II directors of the nominees  recommended by the
     Board of Directors of the Company.

     FOR any proposal to approve the  Company's  1999  Long-Term  Incentive
     Plan.

     FOR  ratification  of the appointment by the Board of Directors of the
     Company  of  Deloitte  & Touche  LLP as  independent  auditor  for the
     Company for the 1999 fiscal year.

     This proxy is coupled with an interest and is irrevocable.


                                   FORSTMANN LITTLE & CO. SUBORDINATED DEBT
INSTRUMENT PARTNERS                AND EQUITY MANAGEMENT BUYOUT PARTNERSHIP-IV

  By: FLC XXII Partnership,          By: FLC XXIX Partnership, L.P.,
      general partner                    general partner


By:                                   By:
   -------------------------             -----------------------------
     Name:                                  Name:
     Title: General Partner                 Title: General Partner



                                                                  Exhibit 5

                          STOCK PURCHASE AGREEMENT
                          ------------------------

          STOCK  PURCHASE  AGREEMENT,  dated  as of April  2,  1999,  among
Forstmann  Little & Co.  Subordinated  Debt and  Equity  Management  Buyout
Partnership-IV,  a New  York  limited  partnership  ("MBO-IV"),  Instrument
Partners,  a New York  limited  partnership  ("IP"  and  collectively  with
MBO-IV,  "FLC"),  and Liberty  Media  Corporation,  a Delaware  corporation
("Liberty").

                                  RECITALS

          WHEREAS,  MBO-IV is the owner of 10,161,657  shares of the common
stock,  par value $0.01 per share (the "Company Common Stock"),  of General
Instrument Corporation,  a Delaware corporation (the "Company"),  and IP is
the owner of 11,547,008 shares of Company Common Stock;

          WHEREAS,  MBO-IV and IP desire to sell,  and  Liberty  desires to
purchase, an aggregate of ten million (10,000,000) shares of Company Common
Stock  (comprised  of 5,319,078  shares from IP and  4,680,922  shares from
MBO-IV)  at a price  per  share of  $28.00,  all  subject  to the terms and
conditions set forth herein; and

          WHEREAS,  contemporaneously  with the  execution  and delivery of
this  Agreement,  MBO-IV and IP are  entering  into an  agreement  with the
Company  (the  "Company  Purchase  Agreement")  to sell to the  Company  an
aggregate of five million  three  hundred  thousand  (5,300,000)  shares of
Company Common Stock.

                                 AGREEMENT

          NOW,  THEREFORE,  for and in consideration of the mutual promises
set forth herein,  and upon the terms and subject to the conditions hereof,
the parties hereto, intending to be legally bound, agree as follows:

1.   PURCHASE AND SALE

     (a) Purchase Price, Payment.

          (i) Subject to the terms and  conditions  contained  herein,  FLC
hereby  agrees to sell,  transfer and assign to Liberty and Liberty  hereby
agrees to purchase,  acquire and accept from FLC, ten million  (10,000,000)
shares of Company  Common Stock (the  "Purchased  Shares").  The  aggregate
purchase price for the Purchased Shares will be $280,000,000 (the "Purchase
Price"). The number of Purchased Shares shall be appropriately  adjusted to
reflect the effects of any stock split,  reverse  split,  stock dividend or
other reclassification or reorganization affecting the capital stock of the
Company,  the record date for which  occurs on or after the date hereof and
prior to the Closing (as defined below).

          (ii) The closing of the purchase and sale of the Purchased Shares
(the  "Closing")  shall be held at the  offices  of  Fried,  Frank,  Harris
Shriver & Jacobson,  One New York  Plaza,  New York,  New York,  or at such
other place as FLC and Liberty may mutually  agree,  at 9:00 a.m. (New York
City time), on April 5, 1999 or as soon thereafter as practicable after all
conditions to Closing have been satisfied or waived. (The date on which the
Closing occurs is referred to as the "Closing Date".)

          (iii) On the Closing Date, each of MBO-IV and IP shall deliver to
Liberty such  instruments  of transfer,  in form and  substance  reasonably
satisfactory  to Liberty,  as shall be sufficient to transfer the Purchased
Shares  to  Liberty,   and  in  exchange  therefor  (and  upon  receipt  of
confirmation  from the Transfer  Agent (as defined below) of its receipt of
the  instruments  of transfer to be delivered  to it) Liberty  shall pay to
MBO-IV  and IP by wire  transfer  of  immediately  available  funds  to the
respective  accounts  previously  designated by MBO-IV and IP the aggregate
Purchase Price.

     (b)  Representations  of FLC.  Each of MBO-IV  and IP  represents  and
warrants to Liberty that:

          (i) It is a duly organized limited partnership,  validly existing
and in good standing under the laws of the State of New York.

          (ii) It has all  necessary  power and  authority  to execute  and
deliver  this  Agreement,  to perform  its  obligations  hereunder,  and to
consummate the transactions contemplated hereby; the execution and delivery
of this  Agreement  by it and the  consummation  by it of the  transactions
contemplated  hereby have been duly and validly authorized by all necessary
partnership  action,  and no other proceedings on its part are necessary to
authorize  the  execution  and  delivery  of  this  Agreement  by  it or to
consummate the transactions contemplated hereby.

          (iii) It is the  owner of  10,161,657  shares of  Company  Common
Stock (in the case of MBO-IV) and 11,547,008 shares of Company Common Stock
(in the case of IP).

          (iv) Except for Liberty's  rights under the Letter  Agreement (as
defined  below),  MBO-IV and IP own the Purchased  Shares free and clear of
all  security  interests,  claims,  liens and  encumbrances  of any nature,
including,  but not  limited  to, any rights of third  parties in or to the
Purchased Shares.

          (v)  This  Agreement  has  been  duly and  validly  executed  and
delivered by it and,  assuming  the due  execution  and delivery  hereof by
Liberty,  this Agreement is its valid and binding  obligation,  enforceable
against it in accordance with its terms,  except as such enforceability may
be limited by bankruptcy, insolvency, reorganization,  moratorium and other
similar laws  affecting  the rights of creditors  generally  and by general
principles of equity.

          (vi) Immediately after the sale,  transfer and assignment thereof
at the Closing,  Liberty will have good title to the Purchased  Shares free
and clear of all security interests,  claims, liens and encumbrances of any
nature (other than any arising pursuant to this Agreement or under state or
federal securities laws or created by Liberty).

          (vii) Each of  the  Registration  Rights  Agreement,  dated as of
April 6, 1992, among MBO-IV, IP, General Instrument Corporation, a Delaware
corporation (the former parent company of the Company), and GI Corporation,
a Delaware  corporation,  and the  letter  agreement  dated  July 25,  1997
between the Company,  MBO-IV and IP (the "Registration  Rights Agreement"),
has been duly  executed and  delivered by MBO-IV and IP, and is a valid and
binding obligation of each such party, enforceable against it in accordance
with its terms, except as such enforceability may be limited by bankruptcy,
insolvency, reorganization, moratorium and other similar laws affecting the
rights of creditors generally and by general principles of equity.

          (viii)  The  assignment  by  MBO-IV  and IP of  certain  of their
rights,  benefits and obligations  under the Registration  Rights Agreement
pursuant to Section 2 hereof will vest in Liberty such rights, benefits and
obligations  under  the  Registration  Rights  Agreement  as are  specified
herein.

          (ix) Other than pursuant to this Agreement, the Letter Agreement,
the  Company  Purchase  Agreement  and the Rule 144 Sale  Arrangements  (as
defined below),  (A) it has no legal obligation,  absolute or contingent to
sell shares of Company  Common Stock to any person,  and (B) no third party
holds any  option,  warrant  or other  right to  acquire  shares of Company
Common Stock from it.

          (x)  There  is no  action,  suit,  investigation  or  proceeding,
governmental  or  otherwise,  pending  or,  to the  best  of its  knowledge
threatened,   against  it   specifically   relating  to  the   transactions
contemplated  by this  Agreement,  nor is there any basis therefor known to
it.

          (xi) Assuming that the Purchased  Shares are sold to Liberty in a
transaction  exempt from registration  under the Securities Act of 1933, as
amended (the  "Securities  Act"),  and from  qualification  or registration
under  applicable  state  securities  laws,  (i) no  consent,  approval  or
authorization of, nor any  registration,  qualification or filing with, any
governmental  agency or  authority  or any other  person is required on its
part  in  order  for  it to  execute  and  deliver  this  Agreement  and to
consummate the transactions  contemplated hereby and (ii) the execution and
delivery of this Agreement by it and the  consummation of the  transactions
contemplated  hereby will not conflict with or result in a material  breach
or  violation  of,  or  accelerate  the  maturity  or the date  upon  which
performance must be commenced or completed under, any material agreement to
which it is a party.

          (xii)It (A) has duly executed and delivered the Company  Purchase
Agreement  pursuant  to which  the  Company  has  agreed,  on the terms and
subject to the conditions  therein,  to purchase five million three hundred
thousand  (5,300,000) shares of Company Common Stock from FLC at a purchase
price of $28.00 per share; and (B) has delivered a true and correct copy of
such agreement to Liberty.

     (c)  Representations  of Liberty.  Liberty  represents and warrants to
each of MBO-IV and IP that:

          (i) Liberty is a corporation duly organized, validly existing and
in good standing under the laws of the State of Delaware.

          (ii) Liberty has all necessary  corporate  power and authority to
execute and deliver this Agreement,  to perform its  obligations  hereunder
and to consummate the transactions  contemplated  hereby; and the execution
and delivery of this Agreement by Liberty,  and the consummation by Liberty
of the  transactions  contemplated  hereby,  have  been  duly  and  validly
authorized by all necessary corporate action on the part of Liberty, and no
other  corporate  proceedings  on the party of  Liberty  are  necessary  to
authorize  this Agreement or to consummate  the  transactions  contemplated
hereby.

          (iii) This  Agreement  has  been  duly  and  validly executed and
delivered by Liberty,  and, assuming the due execution and delivery thereof
by each of MBO-IV  and IP, is a valid and  binding  obligation  of  Liberty
enforceable  against Liberty in accordance  with its terms,  except as such
enforceability  may be limited by bankruptcy,  insolvency,  reorganization,
moratorium  and other  similar  laws  affecting  the  rights  of  creditors
generally and by general principles of equity.

          (iv)  There is no  action,  suit,  investigation  or  proceeding,
governmental or otherwise,  pending or, to the best of Liberty's  knowledge
threatened,  against  Liberty  specifically  relating  to the  transactions
contemplated  by this  Agreement,  nor is there any basis therefor known to
Liberty.

          (v) Assuming that the Purchased Shares are acquired by Liberty in
a transaction  exempt from  registration  under the Securities Act and from
qualification  or registration  under applicable state securities laws, (A)
no  consent,   approval  or   authorization   of,  nor  any   registration,
qualification or filing with, any  governmental  agency or authority or any
other  person is  required  on the part of Liberty in order for  Liberty to
execute  and  deliver  this  Agreement  and for  Liberty  to  purchase  the
Purchased Shares at the Closing; and (B) the execution and delivery of this
Agreement by Liberty and the purchase by it of the Purchased  Shares at the
Closing will not conflict with or result in a material  breach or violation
of, or accelerate the maturity or the date upon which  performance  must be
commenced or completed under, any material  agreement to which Liberty is a
party.

          (vi) Except as expressly set forth in this Agreement,  Liberty is
not relying on any  representations or warranties (whether written or oral)
of FLC. Liberty has consulted with its own advisors to the extent it deemed
necessary  and  has  made  its own  investment  decision  based  on its own
judgment and upon any advice from any such advisors.

     (d)  Investment  Representations  of Liberty.  Liberty  represents and
warrants to each of MBO-IV and IP that:

          (i) Liberty understands that the Purchased Shares it is acquiring
pursuant  to this  Agreement  are being  offered  and sold  pursuant  to an
exemption  from  registration  and  qualification  based  in part  upon the
representations  of  Liberty  contained  herein  and  that  any  subsequent
transfer or assignment  of the Purchased  Shares must be made pursuant to a
transaction which is exempt from  registration  under the Securities Act or
pursuant   to  an   effective   registration   statement.   Liberty  is  an
institutional  accredited  investor  within the meaning of Section  (a)(1),
(2), (3), (7) or (8) of Rule 501 of the Securities Act.

          (ii) Liberty has such  knowledge and  experience in financial and
business  matters that it is capable of evaluating  the merits and risks of
the investment contemplated by this Agreement;  Liberty is able to bear the
economic risk of its investment in the Company.

          (iii) Liberty is acquiring  the  Purchased  Shares solely for its
own account for investment and not with a view toward resale,  transfer, or
distribution  thereof,  nor with any present  intention of distributing the
Purchased Shares. No other person has any right with respect to or interest
in the Purchased  Shares to be acquired by Liberty,  nor has Liberty agreed
to give any person any such interest or right in the future.

2.   ASSIGNMENT

     Pursuant to and in  accordance  with the terms and  conditions  of the
Registration  Rights Agreement,  and effective upon the consummation of the
transactions  contemplated hereby, (a) each of MBO-IV and IP hereby assigns
to  Liberty  its  rights,  benefits  and  obligations  with  respect to the
Purchased Shares under the Registration  Rights Agreement,  and (b) Liberty
hereby (i) accepts and assumes such rights,  benefits and obligations,  and
(ii) agrees to be bound by the terms of the Registration  Rights Agreement;
provided,   however,  that  notwithstanding  the  foregoing,   the  parties
acknowledge  and agree  that (x) upon the  withdrawal  of the  registration
statement  dated August 26,  1998,  FLC shall be entitled to utilize one of
the  registrations to which Liberty is entitled  pursuant to Section 2.1 of
the  Registration  Rights  Agreement  until  such  time as all  Registrable
Securities (as defined in the Registration  Rights  Agreement) owned by FLC
have  been  sold  and  (y) so  long  as it  continues  to  own  Registrable
Securities,  FLC shall  continue to be entitled to exercise its  incidental
registration  rights  pursuant  to Section 2.2 of the  Registration  Rights
Agreement.

3.   DELIVERIES OF FLC AT CLOSING

     At  the  Closing,  FLC  will  deliver  to  Liberty:  (i) a  letter  to
ChaseMellon Shareholder Services, L.L.C., as transfer agent for the Company
Common Stock (the  "Transfer  Agent"),  instructing  the Transfer  Agent to
transfer  (by book  entry  transfer)  the  Purchased  Shares to an  account
designated  by Liberty with the  Transfer  Agent;  and (ii) an  irrevocable
proxy (in the form of Exhibits A-1 and A-2 hereto, as applicable)  executed
by each of MBO-IV  and IP, as the  record  owner of the  Purchased  Shares,
granting  to Liberty the right to vote all of the  Purchased  Shares at the
Company's  1999 annual meeting of  stockholders  (the record date for which
was March 31, 1999).

4.   DELIVERIES OF LIBERTY AT CLOSING

     At the Closing, Liberty will deliver to FLC the Purchase Price by wire
transfer  of  immediately   available  funds  to  the  respective  accounts
previously designated by FLC.

5.   CONDITIONS TO CLOSING

     (a) Conditions  Precedent to the  Obligations of FLC and Liberty.  The
obligations of each of MBO-IV and IP, on the one hand, and Liberty,  on the
other,  to consummate the  transactions  contemplated by this Agreement are
subject to the  satisfaction at or prior to the Closing Date of each of the
following conditions:

          (i)  Absence  of   Injunctions.   No  permanent  or   preliminary
injunction  or  restraining  order  or other  order  by any  court or other
governmental  entity of competent  jurisdiction or other legal restraint or
prohibition preventing consummation of the transactions contemplated hereby
as provided herein shall be in effect.

          (ii) No Proceedings or Adverse  Enactments.  There shall not have
been any action taken, or any statute, rule, regulation, order, judgment or
decree enacted, promulgated,  entered, issued or enforced by any foreign or
United States federal,  state or local governmental entity, and there shall
be no action,  suit or proceeding pending or threatened which (i) makes the
transactions  contemplated  by this  Agreement  illegal or  imposes,  or is
reasonably  likely to result in the  imposition  of,  material  damages  or
penalties  in  connection  therewith,  or (ii)  would,  as of or after  the
Closing,  impose material limitations on the ability of Liberty effectively
to exercise full rights of ownership of the Purchased Shares (including the
right to vote the Purchased Shares on all matters properly presented to the
stockholders of the Company).

          (iii) Company  Purchase Agreement.  (a)  All  conditions  to  the
consummation  of the  transactions  contemplated  by the  Company  Purchase
Agreement shall have been satisfied or waived and the parties thereto shall
be fully prepared to consummate the transactions  contemplated thereby; and
(b) the transactions  contemplated by the Company Purchase Agreement are in
the process of being consummated contemporaneously with the consummation of
the transactions contemplated by this Agreement.

          (iv) Rule 144 Sale.  MBO-IV  and IP shall  have  entered  into an
arrangement (the "Rule 144 Sale  Arrangements") with Goldman Sachs & Co. to
sell an  aggregate  of at least  4,000,000  shares of Company  Common Stock
(other than the  Purchased  Shares and the shares of Company  Common  Stock
subject to the Company Purchase Agreement) under Rule 144 of the Securities
Act,  and  Liberty  shall  have  received   evidence  of  such  arrangement
reasonably satisfactory to it.

     (b) Conditions Precedent to the Obligations of Liberty. The obligation
of Liberty to consummate the transactions contemplated by this Agreement is
also subject to the satisfaction,  at or prior to the Closing Date, of each
of the following conditions,  any or all of which may be waived in whole or
in part by Liberty, to the extent permitted by applicable law:

          (i)   Accuracy   of   Representations    and   Warranties.    All
representations and warranties of MBO-IV and IP contained in this Agreement
shall, if specifically  qualified by materiality,  be true and correct and,
if not so qualified,  be true and correct in all material  respects in each
case as of the date of this  Agreement  and on and as of the Closing  Date,
with the same  force and  effect as  though  made on and as of the  Closing
Date,  except for  changes  expressly  permitted  or  contemplated  by this
Agreement.

          (ii) Performance of Agreements.  Each of MBO-IV and IP shall have
performed in all material  respects all  obligations  and  agreements,  and
complied  in all  material  respects  with all  covenants  and  conditions,
contained in this Agreement to be performed or complied with by it prior to
or on the Closing Date.

          (iii) No Material  Adverse Change.  Since the date hereof nothing
shall have occurred which, individually or in the aggregate, has had or, in
the  reasonable  judgment  of  Liberty,  is  reasonably  likely to have,  a
material  adverse  effect  on the  Company  and its  subsidiaries  or their
businesses, taken as a whole.

          (iv)  Officer's  Certificates.  Liberty  shall  have  received  a
certificate, dated the Closing Date, signed by a general partner of each of
MBO-IV and IP (x) as to the  satisfaction  of the  conditions  set forth in
clauses (i) and (ii) of this Section 5(b) and clause (iii) of Section 5(a),
and (y)  attaching  thereto  a true and  correct  copy of the  Registration
Rights Agreement.

          (v)  Company  Deliveries.  Liberty  shall  have  received  (A)  a
certificate  from an executive  officer of the  Company,  dated the Closing
Date as to the matters  referred to in subsection  (b)(iii) of this Section
5, and (B) a letter of the Company, dated the Closing Date and signed by an
executive officer of the Company,  acknowledging,  among other things,  the
assignment of rights to Liberty  under the  Registration  Rights  Agreement
(such letter to be in form and substance reasonably acceptable to Liberty).

          (vi)  Withdrawal  of  Registration  Statement.   FLC  shall  have
delivered  a letter to the Company  requesting  the Company to apply to the
Securities  and Exchange  Commission  for  withdrawal  of the  Registration
Statement filed on August 26, 1998.

          (vii)  Other  Deliveries.  All other  documents  and  instruments
required under this Agreement (including those required pursuant to Section
3) to have been  delivered  by each of MBO-IV and IP to Liberty at or prior
to the Closing or as Liberty  shall have  reasonably  requested  shall have
been delivered by each of MBO-IV and IP.

     (c) Conditions  Precedent to the Obligations of FLC. The obligation of
FLC to consummate the  transactions  contemplated by this Agreement is also
subject to the  satisfaction,  at or prior to the Closing  Date, of each of
the following conditions,  any or all of which may be waived in whole or in
part by FLC, to the extent permitted by applicable law:

          (i)   Accuracy   of   Representations    and   Warranties.    All
representations  and  warranties  of Liberty  contained  in this  Agreement
shall, if specifically  qualified by materiality,  be true and correct and,
if not so qualified,  be true and correct in all material  respects in each
case as of the date of this  Agreement  and on and as of the Closing  Date,
with the same  force and  effect as  though  made on and as of the  Closing
Date,  except for  changes  expressly  permitted  or  contemplated  by this
Agreement.

          (ii)  Performance of Agreements.  Liberty shall have performed in
all material  respects all obligations and agreements,  and complied in all
material  respects  with all covenants  and  conditions,  contained in this
Agreement  to be  performed  or  complied  with by them  prior to or on the
Closing Date.

          (iii)   Officer's   Certificates.   FLC  shall  have  received  a
certificate  of Liberty  dated the  Closing  Date,  signed by an  executive
officer of Liberty,  as to the  satisfaction of the conditions set forth in
clauses (i) and (ii) above.

          (iv)  Other  Deliveries.  All  other  documents  and  instruments
required under this Agreement (including those required pursuant to Section
4) to have been delivered by Liberty to FLC at or prior to the Closing,  or
as FLC  shall  have  reasonably  requested  shall  have been  delivered  by
Liberty.

6.   TERMINATION

     (a) Termination. This Agreement may be terminated and the transactions
contemplated hereby may be abandoned at any time prior to the Closing,  (i)
by mutual written  consent of Liberty and each of MBO-IV and IP; or (ii) by
either  Liberty or FLC:  (A) if the Closing  shall not have  occurred on or
before 2:00 p.m. New York City time (in the case of a  termination  by FLC)
or 5:00 p.m. New York City time (in the case of a  termination  by Liberty)
on April 5,  1999,  provided  that the right to  terminate  this  Agreement
pursuant to this clause  (ii)(A)  shall not be available to any party whose
failure to perform any of its obligations under this Agreement  required to
be  performed  by it at or prior to the Closing has resulted in the failure
of the Closing to occur before such date,  (B) if there has been a material
breach  by the  other  party  of any  of its  representations,  warranties,
covenants or agreements  contained in this  Agreement and such breach shall
not have been cured within five business days after written  notice thereof
shall have been received by the party alleged to be in breach or (C) if any
court of competent  jurisdiction  or other  competent  governmental  entity
shall  have  issued  an order,  decree or ruling or taken any other  action
permanently  restraining,  enjoining  or otherwise  prohibiting  any of the
transactions  contemplated by this Agreement and such order, decree, ruling
or other action shall have become final and nonappealable.

     (b) Effect of  Termination.  In the event of any  termination  of this
Agreement by Liberty or FLC pursuant to Section 6(a) hereof, this Agreement
forthwith  shall become void, and there shall be no liability or obligation
on the part of any party hereto,  except that nothing herein will relieve a
party from  liability for any breach of this Agreement  occurring  prior to
such termination.

7.   COVENANTS

     (a) Reasonable  Efforts.  Upon the terms and subject to the conditions
hereof,  each  of  the  parties  hereto  agrees  to  use  its  commercially
reasonable  efforts to take, or cause to be taken, all appropriate  action,
and to do, or cause to be done, all things  necessary,  proper or advisable
under  applicable  laws and  regulations  or  otherwise to  consummate  the
transactions contemplated hereby.

     (b)  Covenant  of FLC.  During the period  from the date hereof to and
including  the 90th day  following  the  Closing  (the  "Lock-Up  Period"),
neither MBO-IV nor IP will,  without the prior written  consent of Liberty,
directly or indirectly, (i) offer, pledge, sell, contract to sell, sell any
option or contract to  purchase,  purchase  any option or contract to sell,
grant any option, right or warrant for the sale of, or otherwise dispose of
or  transfer  any  shares  of  Company  Common  Stock,  or  any  securities
convertible  into or  exchangeable or exercisable for Company Common Stock,
or (ii) enter into any swap or any other agreement or any transaction  that
transfers,  in whole or in  part,  directly  or  indirectly,  the  economic
consequence of ownership of the Company Common Stock, whether any such swap
or  transaction  is to be settled by  delivery of Company  Common  Stock or
other  securities,  in cash  or  otherwise;  provided,  however,  that  the
provisions  of this  Section  7(b) shall not be  applicable  to the sale of
shares of Company Common Stock  pursuant to and in accordance  with (A) the
Company Purchase  Agreement,  (B) the Rule 144 Sale  Arrangements and (C) a
Block Sale Transaction (as defined below).  "Block Sale Transaction"  shall
mean a sale of not less than 200,000  shares of Company Common Stock in one
transaction  or a series of  transactions  taking place on a single trading
day (i) pursuant to a sell order placed with a single  brokerage firm, (ii)
to a single market-maker or (iii) to an institutional investor, in any case
at a price per share (before selling expenses) of not less than $28.

8.   RIGHT OF FIRST REFUSAL

     (a)  Liberty,  as  assignee  of TCI  Ventures  Group,  LLC  ("Ventures
Group"), hereby waives its right of first refusal under that certain letter
agreement, dated August 1, 1998 (the "Letter Agreement"), among MBO-IV, IP,
Ventures Group and the other parties  thereto,  with respect to the sale of
shares of Company Common Stock  pursuant to and in accordance  with (i) the
Company Purchase Agreement, (ii) the Rule 144 Sale Arrangements,  (iii) any
Block Sale Transaction  taking place prior to the conclusion of the Lock-Up
Period and (iv) any Market Sale (as defined  below)  consummated  after the
Lock-Up Period at a price per share (before selling  expenses) of $28.00 or
more.

     (b) Each of MBO-IV and IP hereby  acknowledges and agrees that, except
as provided in  subsection  8(a) above,  Liberty's  right of first  refusal
under the Letter  Agreement  shall  continue in effect with  respect to all
shares of Company  Common Stock owned by MBO-IV or IP following the Closing
in  accordance  with the  terms  thereof  (including  Section  3  thereof);
provided,  however,  that the parties  agree that with  respect to any open
market sale of Company  Common  Stock  proposed to be made by FLC after the
Closing at a price per share (before selling expenses) of less than $28.00,
the right of first refusal pursuant to the Letter Agreement (if applicable)
shall be effected as follows:

          (x) Each of MBO-IV and IP shall notify  Liberty of its  intention
     to sell in a broker transaction on the New York Stock Exchange or to a
     market-maker  (a "Market  Sale");  such notice (a "Sale Notice") shall
     specify the number of shares of Company  Common  Stock  proposed to be
     sold and shall  specify the price at which  MBO-IV or IP is willing to
     sell;  such Sale Notice  shall be in writing and shall be delivered to
     Liberty via  telecopier  and shall  constitute an offer by FLC to sell
     the number of shares specified therein at the price specified therein;

          (y) If Liberty  delivers written notice (by telecopier) to MBO-IV
     or IP (as  applicable)  within  24  hours of its  receipt  of the Sale
     Notice accepting the offer set forth in the Sale Notice, Liberty shall
     be obligated to thereafter purchase the shares of Company Common Stock
     specified in the Sale Notice at the price  specified  therein,  all in
     accordance  with the terms  and  procedures  set  forth in the  Letter
     Agreement,  except that the closing  thereunder  shall take place on a
     mutually  agreed date not later than the sixth  business day following
     Liberty's receipt of the Sale Notice; and

          (z) If  Liberty  does not  deliver  such  notice  within the time
     specified,  MBO-IV  and  IP  shall  be  permitted  to  sell  up to the
     aggregate number of shares specified in the Sale Notice in open market
     transactions  at a price per share of  Company  Common  Stock not less
     than that specified in the Sale Notice during the period ending at the
     close of  business  on the fifth  trading  day  following  the date of
     delivery of the Sale Notice.

9.   MISCELLANEOUS

     (a)  Further  Assurances.  From and after the  Closing  Date,  each of
MBO-IV,  IP and  Liberty  shall,  at any time and from time to time,  make,
execute and  deliver,  or cause to be made,  executed and  delivered,  such
instruments,  agreements,  consents and  assurances and take or cause to be
taken all such  actions as may  reasonably  be requested by the other party
hereto to effect the purposes and intent of this Agreement.

     (b)  Expenses.  Except as  otherwise  provided  herein,  all costs and
expenses, including, without limitation, fees and disbursements of counsel,
financial  advisors  and  accountants,  incurred  in  connection  with this
Agreement  and the  transactions  contemplated  hereby shall be paid by the
party  incurring such costs and expenses,  whether or not the Closing shall
occur.

     (c)  Notices.  All  notices,  requests,  demands,  waivers  and  other
communications required or permitted to be given under this Agreement shall
be in writing and shall be deemed to have been duly given on (i) the day on
which  delivered  personally or by telecopy  (with prompt  confirmation  by
mail)  during a  business  day to the  appropriate  location  listed as the
address below, (ii) three business days after the posting thereof by United
States registered or certified first class mail, return receipt  requested,
with  postage  and fees  prepaid or (iii) one  business  day after  deposit
thereof for overnight delivery. Such notices, requests, demands, waivers or
other communications shall be addressed as follows:

          (i)  if to either MBO-IV or IP to:

               c/o Forstmann Little & Co.
               767 Fifth Avenue
               New York, New York 10153
               Attention:  Winston W. Hutchins
               Telecopy No.:  (212) 759-9059

               with a copy to:

<PAGE>

               Fried, Frank, Harris, Shriver & Jacobson
               One New York Plaza
               New York, New York 10005
               Attn: Aviva Diamant, Esq.
               Telecopy No.: (212) 859-4000

          (ii) if to Liberty to:

               Liberty Media Corporation
               8101 East Prentice Avenue
               Englewood, Colorado 80111
               Attn: Charles Y. Tanabe, Esq.
               Telecopy No.: (303) 721-5443


               with a copy to:

               Baker & Botts, L.L.P.
               599 Lexington Avenue
               New York, New York 10022
               Attn: Frederick H. McGrath, Esq.
               Telecopy No.: (212) 705-5125

or to such other person or address as any party shall  specify by notice in
writing to the other party.

     (d) Entire Agreement. This Agreement (including the documents referred
to herein)  constitutes  the  entire  agreement  between  the  parties  and
supersedes  all prior  agreements  and  understandings,  oral and  written,
between the parties with respect to the subject matter hereof.

     (e)  Amendment.  This  Agreement  may  not  be  amended  except  by an
instrument in writing signed on behalf of each of the parties.

     (f)  Governing  Law. This  Agreement  shall be construed in accordance
with and governed by the laws of the State of New York,  without  regard to
conflicts of laws.

     (g)  Assignment.  No party hereto (or any  permitted  assignee of such
party's rights or  obligations  hereunder) may assign its right or delegate
its  obligations  hereunder  without the prior written consent of the other
party hereto,  except as otherwise  permitted by and in accordance with the
terms hereof and except that Liberty may assign its rights  hereunder to an
entity which is a wholly owned  subsidiary  of Liberty as of the Closing so
long as the  representations  and  warranties  made by  Liberty  herein are
equally true as to such subsidiary. Nothing in this Agreement, expressed or
implied,  is  intended  to confer on any person  other than the  parties or
their respective successors and assigns, any rights, remedies,  obligations
or liabilities under or by reason of this Agreement.

     (h) Certain Definitions.  As used in this Agreement, the term "person"
shall  mean  and  include  any  individual,   partnership,  joint  venture,
corporation, trust, unincorporated organization or association or any other
entity or association of any kind and any authority,  federal, state, local
or foreign  government,  any political  subdivision  of any thereof and any
court, panel, judge, board, bureau,  commission,  agency or other entity or
body   exercising   executive,   legislative,   judicial,   regulatory   or
administrative functions of or pertaining to any government.

     (i)   Counterparts.   This   Agreement  may  be  executed  in  several
counterparts and as so executed shall  constitute one agreement  binding on
the parties hereto.

     (j)  Severability.  In the  event  that  any  part  or  parts  of this
Agreement  shall be held to be  unenforceable  to its or their full extent,
then it is the  intention  of the  parties  hereto  that such part or parts
shall be enforced to the full extent  permitted  under the laws, and in any
event,  that all other parts of this Agreement shall remain valid and fully
enforceable  as if the  unenforceable  part or parts had never  been a part
hereof.


<PAGE>


          IN WITNESS WHEREOF,  each of the parties hereto has executed this
Agreement as of the date first written above.


                                    FORSTMANN LITTLE & CO. SUBORDINATED
                                    DEBT AND EQUITY MANAGEMENT BUYOUT
                                    PARTNERSHIP-IV

                                    By: FLC XXIX Partnership, L.P., 
                                        General Partner


                                          By:/s/ Steven B. Klinsky
                                              -----------------------------
                                               Name:  Steven B. Klinsky
                                               Title: General Partner



                                    INSTRUMENTS PARTNERS

                                    By:   FLC XXII Partnership, General
                                          Partner


                                          By:/s/ Steven B. Klinsky
                                              -----------------------------
                                               Name: Steven B. Klinsky
                                               Title: General Partner



                                    LIBERTY MEDIA CORPORATION


                                    By:/s/ Robert R. Bennett
                                        -----------------------------------
                                               Name: Robert R. Bennett
                                               Title: President




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