XIRCOM INC
S-3/A, 1999-11-19
COMPUTER COMMUNICATIONS EQUIPMENT
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<PAGE>


As filed with the Securities and Exchange Commission on November 19, 1999

                                                Registration No. 333-90783
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
                               ----------------

                            Amendment No. 1 to
                                   FORM S-3
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
                               ----------------
                                 XIRCOM, INC.
            (Exact Name of Registrant as Specified in Its Charter)
                               ----------------
<TABLE>
<S>                                                <C>
                    California                                           95-4221884
         (State or other jurisdiction of                              (I.R.S. Employer
          Incorporation or organization)                           Identification Number)
</TABLE>
                          2300 Corporate Center Drive
                        Thousand Oaks, California 91320
                                (805) 376-9300
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)
                               ----------------
                              Steven F. DeGennaro
                            Chief Financial Officer
                                 Xircom, Inc.
                          2300 Corporate Center Drive
                        Thousand Oaks, California 91320
                                (805) 376-9300
(Name, Address, Including Zip Code, and Telephone Number, Including Area Code,
                             of Agent for Service)
                               ----------------
                                  Copies to:
<TABLE>
<S>                                                <C>
               Howard Zeprun, Esq.                                 Alan F. Denenberg, Esq.
        Wilson Sonsini Goodrich & Rosati,                            Shearman & Sterling
             Professional Corporation                                1550 El Camino Real
                650 Page Mill Road                                  Menlo Park, CA 94025
           Palo Alto, California 94304                                 (650) 330-2200
                  (650) 493-9300
</TABLE>
                               ----------------
  Approximate date of commencement of proposed sale to the public: As soon as
practicable after the registration statement becomes effective.
                               ----------------
  If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the
following box. [_]
  If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or
interest reinvestment plans, check the following box. [_]
  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [_]
  If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, please check the following box and list the
Securities Act registration statement number of the earlier effective
registration statement for the same offering. [_]
  If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]

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

  The Registrant hereby amends this registration statement on such date or
dates as may be necessary to delay its effective date until the Registrant
shall file a further amendment which specifically states that this
registration statement shall thereafter become effective in accordance with
Section 8(a) of the Securities Act of 1933 or until this registration
statement shall become effective on such date as the Commission, acting
pursuant to said Section 8(a), may determine.

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+                                                                              +
+The information in this prospectus is not complete and may be changed. We may +
+not sell these securities until the registration statement filed with the     +
+Securities and Exchange Commission is effective. This prospectus is not an    +
+offer to sell these securities and it is not soliciting an offer to buy these +
+securities in any state where the offer or sale is not permitted.             +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

              SUBJECT TO COMPLETION, DATED NOVEMBER 19, 1999

                                3,500,000 Shares

                         [LOGO OF XIRCOM APPEARS HERE]

                                  Common Stock

                                   --------

  We are selling 3,500,000 shares of common stock.

  Our common stock is listed on The Nasdaq National Market under the symbol
"XIRC." On November 17, 1999, the last reported sale price of our common stock
was $52.50 per share.

  The underwriters have an option to purchase a maximum of 525,000 additional
shares to cover over-allotments of shares.

  Investing in the common stock involves risks. See "Risk Factors" on page 8.

<TABLE>
<CAPTION>
                                                            Underwriting
                                               Price to    Discounts and   Proceeds to
                                                Public      Commissions    Xircom, Inc.
                                            -------------- -------------- --------------
<S>                                         <C>            <C>            <C>
Per Share..................................     $              $              $
Total......................................    $              $              $
</TABLE>

  Delivery of the shares of common stock will be made on or about       , 1999.

  Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if
this prospectus is truthful or complete. Any representation to the contrary is
a criminal offense.

Credit Suisse First Boston

                         CIBC World Markets

                                                                       SG Cowen

                  The date of this prospectus is      , 1999.
<PAGE>

                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                          Page
                                                                          ----
<S>                                                                       <C>
Prospectus Summary.......................................................   4
Risk Factors.............................................................   8
Use of Proceeds..........................................................  14
Dividend Policy..........................................................  14
Price Range of Common Stock..............................................  14
Capitalization...........................................................  15
Selected Financial Data..................................................  16
Management's Discussion and Analysis of Financial Condition and Results
 of Operations...........................................................  17
</TABLE>
<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Description of Capital Stock...............................................  25
Underwriting...............................................................  26
Notice to Canadian Residents...............................................  28
Legal Matters..............................................................  29
Experts....................................................................  29
Additional Information ....................................................  29
Index to Supplemental Consolidated Financial Statements.................... F-1
</TABLE>

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

  You should rely only on information contained in this document or to which we
have referred you. We have not authorized anyone to provide you with
information that is different. This document may only be used where it is legal
to sell these securities. The information in this document may only be accurate
on the date of this document.

                                       3
<PAGE>

                               PROSPECTUS SUMMARY

  You should read the following summary together with the more detailed
information concerning our company and the common stock being sold in this
offering and our financial statements and related material appearing in this
prospectus and in the documents incorporated by reference in this prospectus.
Because this is only a summary, you should read the rest of this prospectus,
including the documents incorporated by reference in this prospectus, before
you invest in our common stock. Read this entire prospectus carefully,
especially the risks described under "Risk Factors." Unless otherwise stated,
information in this prospectus assumes that the underwriters' over-allotment
option to purchase an additional 525,000 shares of common stock is not
exercised.

                                  XIRCOM, INC.

  We are a leading global provider of mobile networking and information access
solutions for mobile professionals. Our products enable connectivity between
notebook computers and handheld computer devices and corporate networks, the
Internet and other online services from a wide variety of locations.

Our Market

  Competitive and productivity demands are requiring an ever larger number of
professionals to maintain remote and mobile connectivity to their corporate
databases, intranets, email and the Internet. This trend toward mobile
computing has resulted in the increased use of notebook PCs and handheld
computing devices both on the road and in the office. International Data
Corporation ("IDC") estimates that the total remote and mobile computing
workforce in the U.S., including work extenders, mobile professionals,
telecommuters and mobile data collectors, will be 37.8 million people in 2000,
increasing to 47.1 million in 2003. These industry trends are creating a strong
demand for notebook computers. IDC further estimates that total annual
worldwide notebook PC shipments will be 22.3 million units in 2000 and 31.2
million units in 2003.

  The principal device for portable computing connectivity is the PC Card, a
credit card-sized electronic component that contains a modem, a local area
network ("LAN") connection, or a combination of these, and can be inserted into
a slot on a portable computer. IDC estimates that in the year 2000,
19.6 million PC Cards will be shipped worldwide. In addition, we believe there
will be a significant market for connectivity devices smaller than PC Cards,
for use with new generations of sub-notebook PCs and handheld computing
devices.

Our Products

  We have consistently pioneered the development of new mobile networking
technologies and products. In 1992, we were the first company to ship a LAN
adapter in the PC Card form factor, compliant with the standards set by the
Personal Computer Memory Card International Association (also known as PCMCIA
Cards). We expanded our product offerings in 1994 to include the first combo
LAN and modem PC Cards. We believe combo cards continue to represent the
fastest growing segment of the PC Card market. In 1998, we introduced our
RealPort family of Integrated PC Cards, which eliminate the need for pop-out
jacks and external cables. In 1999, we introduced Universal Serial Bus ("USB")
port expansion systems, both through our own internal product offering
introduced in August 1999 and through our acquisition of Entrega Technologies,
Inc. ("Entrega") in October 1999. Through our acquisition in September 1999 of
the Rex personal information manager product line from Franklin Electronic
Publishers, we have also entered the market for sub-handheld information
accessories.

                                       4
<PAGE>


  Our products, which are recognized for innovative technology, high
reliability and broad compatibility, currently include:

  . PC Cards and Integrated PC Cards. Our PC Cards and Integrated PC Cards
    enable LAN, modem or combination LAN and modem connectivity for portable
    PCs. Our line of RealPort Integrated PC Cards features a patented
    connection point consisting of a built-in, standard connector,
    eliminating the need for pop-out jacks and external cables, which are
    often broken or lost.

  . Mini PCI Cards. Our Mini PCI Cards provide to OEMs a flexible and low-
    cost means to add internal communication functionality to notebook and
    sub-notebook computers and handheld computing devices.

  . Handheld Connectivity Cards. We have recently introduced a line of LAN
    and modem connectivity cards for handheld information appliances,
    including our CompactCards for Windows CE devices.

  . USB Port Expansion Systems. Our recently introduced PortGear and
    PortStation products are USB port expansion systems that provide
    peripheral-to-PC connectivity, including modem, LAN and Ethernet
    connectivity. Our PortStation products consist of mix-and-match modular
    connectivity ports that can be individually configured and snapped
    together, connecting to a single USB port on the host PC. PortStation
    products are targeted for the enterprise market. PortGear products are
    USB connection devices targeted for value-focused OEM and consumer
    markets.

  . Wearable Information Accessories. Our Rex line of sub-handheld
    information accessories provides convenient mobile information access by
    combining a personal organizer into a PC Card.

  Our technological leadership and innovative product designs are reflected in
the numerous industry awards our products have received. These include:

  . RealPort Ethernet 10/100+Modem 56: Notebook & Organizer "Best PC Card
    Modem 1999"

  . RealPort CardBus Ethernet 10/100+Modem 56: PC Computing "1998 MVP Award"
    Hardware, PC Card Network Adapter

  . CreditCard Ethernet 10/100+Modem 56: PC Computing "1997 MVP Winner"

  . CreditCard Ethernet Adapter 10/100: Network Computing 1996 Editor's
    Choice

  . CreditCard Ethernet+Modem: PC Magazine 1995 Technical Excellence Award--
    Networking Hardware category

  We sell our products primarily through domestic and international
distributors. Domestic distributors include Ingram Micro Inc., Tech Data
Corporation and Merisel, Inc., and reseller organizations such as MicroAge,
Inc. and Inacom Corp.  International distributors include Tech-Pacific Ltd.,
LANDIS and C2000/Tech Data and international resellers such as Computacenter
Ltd. We also sell our products to a number of large OEM customers, such as
Compaq Computer Corporation, Dell Computer Corporation, Gateway Inc.,
International Business Machines, Intel Corporation and Toshiba Corporation.
U.S. enterprise customers standardized on our products include Wal-Mart Stores,
Inc., AT&T Corp., Bell Atlantic Corporation, Lucent Technologies, Inc., The
Walt Disney Company, Bank One Corporation, Pfizer Inc., McDonald's Corporation
and the Federal Reserve Board. Examples of customers standardized globally on
our products include Oracle Corporation, PricewaterhouseCoopers LLP, Cisco
Systems Inc., McKinsey & Company Inc., Microsoft Corporation, DaimlerChrysler
AG, Hewlett-Packard Company, Volvo AB, Novartis AG and BP Amoco Plc.

                                       5
<PAGE>


  We intend to continue to develop our existing product offerings to support
leading edge connectivity standards. We expect customers for our PC Card and
port expansion system products to continue to demand higher speeds and
bandwidth. We are focusing our development efforts on new versions of
Integrated PC Card and PC Card LAN adapters, modem-only cards, multifunction
cards and port expansion systems. Such new versions may combine LAN, modem,
ISDN, digital subscriber line, cable modem, local and/or wide area wireless
communications, and home networking technologies. We also plan to introduce an
enterprise version of the Xircom Rex wearable information accessory that
combines its current information management capabilities with two-factor
authentication technology to offer an integrated user authentication solution
for corporate networks.

  We also intend to continue to develop new product lines to complement our
existing product offerings and capitalize on opportunities created by
advancements in notebook PC and handheld computer technology. For example, the
Palm-based Visor handheld computer, launched by Handspring, Inc. in September
1999, includes an external expansion slot that accepts devices referred to as
"Springboard Modules." The Springboard external expansion slot is the first
attempt to create a standardized expansion slot for Palm-based handheld
devices, and could become the de-facto standard. We are developing products
based on this Springboard standard for the Palm segment, to complement our
handheld connectivity products to support handheld computers using the
Windows CE operating system.

Recent Developments

  We recently completed two acquisitions, enhancing our leading position in the
mobile networking market. On September 27, 1999, we completed the acquisition
of certain assets of the Rex product line, including intellectual property,
inventory and fixed assets, from Franklin Electronic Publishers for $13.25
million in cash. The Rex product line allows us to enter the wearable
information accessory market. These products, which will be marketed under the
Xircom Rex brand name, are expected to be offered through leading retail
channels as well as our worldwide distributor network. On October 1, 1999, we
completed the acquisition of Entrega, a leader in the consumer USB port
expansion market. Entrega's products will be marketed as Xircom PortGear
products and are expected to be offered worldwide through mass merchandise,
retail and OEM channels. We expect from time to time to continue to evaluate
the acquisition of additional businesses, products and technologies.

  We were incorporated in 1988 in California. Our principal executive offices
are located at 2300 Corporate Center Drive, Thousand Oaks, California 91320.
Our telephone number is (805) 376-9300.

                                  The Offering

<TABLE>
 <C>                                          <S>
 Common Stock Offered........................ 3,500,000 shares
 Common Stock Outstanding after this
  Offering................................... 28,453,217
 Use of Proceeds............................. General corporate purposes and
                                              potentially for acquisition
                                              opportunities that may arise in
                                              the future. See "Use of
                                              Proceeds."
 Nasdaq National Market Symbol............... XIRC
</TABLE>

                                       6
<PAGE>


                             Summary Financial Data

  The following summary consolidated financial data gives retroactive effect to
our acquisition of Entrega on October 1, 1999. The acquisition was accounted
for as a pooling-of-interests.

<TABLE>
<CAPTION>
                                          Year Ended September 30,
                                ----------------------------------------------
                                  1995      1996     1997      1998     1999
                                --------  -------- --------  -------- --------
                                   (in thousands, except per share data)
<S>                             <C>       <C>      <C>       <C>      <C>
Statement of Operations Data:
Net sales...................... $119,528  $166,757 $184,575  $276,947 $424,436
Gross profit...................   40,480    59,320   58,275    97,570  181,188
In-process research and
 development and other
 nonrecurring charges(1).......    5,745     1,505    2,163       --     4,596
Operating income (loss) from
 continuing operations.........  (22,467)    9,012   (7,958)   19,515   49,544
Income (loss) from continuing
 operations(1).................  (15,032)    5,168   (3,349)   15,854   34,605
Discontinued operations:
  Operating income (loss) net
   of income taxes.............  (43,772)      784     (226)      --       --
  Loss on disposal, net of
   income taxes................      --        --    (6,275)      --       --
Net income (loss).............. $(58,804) $  5,952 $ (9,850) $ 15,854 $ 34,605
Diluted earnings (loss) per
 share(1):
  Continuing operations........ $  (0.88) $   0.26 $  (0.16) $   0.68 $   1.35
  Net income (loss)............ $  (3.44) $   0.30 $  (0.46) $   0.68 $   1.35

Balance Sheet Data:
Working capital................ $ 25,909  $ 34,711 $ 95,501  $116,062 $135,480
Total assets................... $ 85,649  $107,201 $147,930  $197,935 $275,496
Long-term obligations, net of
 current portion............... $    597  $  1,860 $    --   $    --  $    --
Shareholders' equity........... $ 53,095  $ 65,603 $113,427  $134,751 $174,920
</TABLE>
- --------
(1) Fiscal 1999 includes $4,596 ($3,309 net of tax benefit) or $0.13 per share
    for write-off of in-process research and development and other nonrecurring
    charges. Fiscal 1997 includes $2,163 ($1,514 net of tax benefit) or $0.07
    per share for write-off of in-process research and development. Fiscal 1996
    includes $1,505 ($1,023 net of tax benefit) or $0.05 per share for loss on
    sale of Netwave product line. Fiscal 1995 includes $5,745 ($3,561 net of
    tax benefit) or $0.21 per share for other nonrecurring charges.

                                       7
<PAGE>

                                  RISK FACTORS

  We face the risk of being unable to remain competitive in the mobile
   information access industry.

  Companies in the PC, desktop LAN adapter and modem industries with greater
name recognition and greater financial resources than us have a significant
presence in the PC Card adapter market, including, in particular, 3Com. As a
result, we have faced significant competition in our industry. Actions by our
competitors which continue to influence this competitive environment include
price reductions, new product introductions, promotional efforts, and changes
in the level of channel inventory. We expect competition to remain intense and
as a result, we may lose some of our business to our competitors. Further, we
believe that the market for our products will continue to be price competitive
and thus we could continue to experience lower selling prices, lower gross
profit margins and reduced profitability levels for such products than in the
past.

  We face the risk of being unable to compete if our manufacturing facility
   becomes unable to produce our products efficiently.

  Our manufacturing facility, located in Malaysia, produces all of our PC Card
adapter products. We may be unable to achieve significant additional
efficiencies from this facility. If we are unable to achieve additional cost
reductions through increased production or manufacturing efficiencies we may be
unable to keep pace with our competitors' cost or price reductions to an extent
necessary to maintain or increase our market share without adversely affecting
gross profit margins. In addition, interruptions in the supply of products
could occur if we are unable to accurately forecast demand levels or react
sufficiently rapidly to changes. This in turn could adversely affect future
sales. We also face risks associated with maintaining production facilities
overseas, including management of a distant and remote manufacturing facility,
currency fluctuations and potential instability in the local country. This is
particularly of concern to us in light of recent economic and political
uncertainty in Malaysia and in Asia generally.

  We face the risk of declining margins resulting from changes in the mix of
   products we sell and in the types of customers to whom we sell.

  Certain of our products have lower gross profit margins than others. As a
result, changes in our product mix could result in variations in overall gross
profit margin. See "Management's Discussion and Analysis of Financial Condition
and Results of Operations" for a discussion of the relative margins of our
different products. In addition, shipments to our OEM customers generally
result in lower average selling prices and gross profit margins than sales made
through our distribution partners. Furthermore, the increased percentage of
revenue from OEM customers during fiscal 1999 as compared to fiscal 1998 has
resulted in an increased concentration in our customer base. With this
increased customer concentration, we have increased our dependency on a more
limited number of customers at lower average selling prices and gross profit
margins than sales made through our distribution partners. These trends may
continue, as we anticipate a continuing increase in OEM revenues as a
percentage of sales.

  We face certain risks as a result of our international sales and
   manufacturing activities.

  Our sales may be subject to government controls and other risks such as:

  .  Federal restrictions on export;
  .  Export licenses;
  .  Trade restrictions;
  .  Changes in tariff and freight rates;
  .  Currency fluctuations; and
  .  Political instability.

As a result of recent and potential factors such as currency fluctuations and
economic instability impacting international markets, we could encounter
difficulties in accessing new and existing international markets or

                                       8
<PAGE>

experience increased credit risks. Such credit risks could include insolvency
of customers or other impairments of customers' ability to repay amounts owed
to us. These credit risks could also include insolvency of vendors or other
impairments of vendors' ability to supply materials to us.

  Foreign currency fluctuations could adversely affect our results.

  We do all our manufacturing at our facility in Malaysia and our European
sales headquarters is located in Belgium. As a result, a significant portion of
our operating expenses are currently denominated in the Malaysian ringgit and
the Belgian franc. The majority of our international sales have been
denominated in U.S. dollars in 1999 and prior fiscal years. However, beginning
with fiscal year 2000, we expect that the majority of our international sales
will be denominated in the Euro. We do not engage in foreign currency hedging
transactions, although we do mitigate our operating expense exposure to some
extent by purchasing in advance a portion of the currency expected to be needed
for overseas operating expenses. Accordingly, our results of operations could
be adversely affected as a result of foreign currency fluctuations. In
particular, in September 1998, the Malaysian government fixed the exchange rate
of the Malaysian currency at 3.8 ringgits per U.S. dollar. Any potential
reversion to a floating exchange rate could have an adverse effect on our
results of operations.

  We face the risk of incurring unnecessary expenses if we are unable to
   accurately predict sales of our products.

  We generally ship products within one to four weeks after receipt of orders.
Therefore, our sales backlog is typically minimal. Accordingly, our
expectations of future net sales are based largely on our own estimates of
future demand and not on firm customer orders. If our net sales do not meet
expectations, profitability would be adversely affected, as we may not be able
to reduce expenses at the same pace in the near term.

  We face the risk of a reduction in our sales if we are unable to respond
   quickly to changes in demand for our products.

  Our net sales can be affected by changes in the quantity of products that our
distributor and OEM customers maintain in their inventories. Due to steps we
took beginning in the fourth quarter of fiscal 1997, we believe that our
distribution partners carry relatively low quantities of our inventory compared
to our competitors'. We also have taken steps, beginning in the second quarter
of fiscal 1999, to reduce the levels of inventory maintained by our OEM
customers. We believe that these actions enable us to react more quickly to
changes in market demand. However, we may also be more directly and more
rapidly affected by changes in the market, including the impact of any slowdown
or rapid increase in end user demand. Despite our efforts to reduce channel
inventory exposure, distribution partners and OEM customers may still choose to
reduce their inventories below current levels, which could cause a reduction in
our net sales.

  We face the risk of being unable to compete if we are not able to develop new
   products in a timely manner.

  Our continued success is dependent on our ability to continue to introduce
new products with advanced features, functionality and solutions that our
customers demand. We may not be able to continue to introduce new products on a
timely basis that are accepted by the market, or that sell through to end users
in quantities sufficient to make the products viable for the long-term. Sales
of our new products may negatively impact sales of existing products. In
addition, we may have difficulty establishing our products' presence in markets
where we do not currently have significant brand recognition.

  We face the risk of being unable to manufacture our products because we are
   dependent on a limited number of qualified suppliers for our components.

  Because of frequent technology changes and rapid industry growth, the cost
and availability of components used to manufacture our products may fluctuate.
Because some components, including custom

                                       9
<PAGE>

chipsets, are available from sole suppliers, we risk having an inadequate
supply of components due to a number of factors, including:

  .  Supplier manufacturing constraints;
  .  Excess of demand versus supply;
  .  National political or economic changes; and
  .  Other risks not within our control.

Although we have not experienced any significant parts shortages over the past
year, many components we use require long-lead purchase orders thereby limiting
our flexibility to change order quantities in the event of changes in demand.
Any supply source interruptions, limitations on availability, or inability to
develop alternative sources as needed could adversely affect our ability to
deliver products and, in turn, our future earnings.

  We face the risk that rapid technological changes and short product life
   cycles in our industry could harm our business.

  Rapid technological change and short product life cycles characterize the
industry in which we operate. The industry includes competitors with greater
financial and technical resources than us, including, in particular, 3Com.
While we have historically been successful in developing or integrating leading
technology into our products, ongoing investment in research and development is
required for us to maintain our technological position. We may need to increase
the rate of such investment depending on competitive factors, and we may not be
able to innovate as quickly as our competitors.

  If networking capability is included in extension modules to PCs or in the PC
itself, it could result in a reduction in the demand for add-on networking
devices. In addition, while we believe our Realport connection port is a
competitive strength, as computing devices become ever smaller, connectivity
device form factors may become too small to permit use of the Realport
connector. Our operating results and ability to retain our market share are
also dependent on continued growth in the underlying markets for notebook
networking products, and notebook computers, and the notebook-to-network
connection rate.

  We face the risk that we could become involved in intellectual property
   disputes and may be unable to enforce our intellectual property rights.

  We may not be able to protect our intellectual property adequately through
patent, copyright, trademark and other protection. For example, patents issued
to us may not be upheld as valid if litigation over the patent were initiated.
If we are unable to protect our intellectual property adequately, it could
allow competitors to duplicate our technology or may otherwise limit any
competitive technological advantage we may have. Because of the rapid pace of
technological change in the communications industry we believe our success is
likely to depend more upon continued innovation, technical expertise, marketing
skills and customer support and service rather than upon legal protection of
our proprietary rights. However, we will aggressively assert our intellectual
property rights when necessary.

  With the proliferation of new products and rapidly changing technology in the
mobile information access market, there has been a significant volume of
patents or similar intellectual property rights held by third parties. Given
the nature of our products and development efforts, there are risks that claims
associated with such patents or intellectual property rights could be asserted
against us by third parties. These risks include the cost of licensing or
designing around a given technology. If a claimant refuses to offer such a
license on terms acceptable to us, there is a risk of incurring substantial
litigation or settlement costs regardless of the merits of the allegations. In
the event of litigation, if we do not prevail we may be required to pay
significant damages and/or to cease sales and production of infringing
products.

                                       10
<PAGE>

  We currently use software licensed from third parties in certain of our
Combo, modem-only and Token Ring products. Our operating results could be
adversely affected by a number of factors relating to this third-party
software, including:

  . Failure by a licensor to accurately develop, timely introduce, promote or
     support the software;
  . Delays in shipment of our products;
  . Excess customer support or product return costs experienced by us due to
     errors in licensed software; or
  . Termination of our relationship with such licensors.

  We face the risk of being unable to attract and retain qualified managerial
   and other skilled personnel.

  Our continued success depends, in part, on our ability to identify, attract,
motivate and retain qualified managerial, technical and sales personnel.
Because our future success is dependent on our ability to manage effectively
the enhancement and introduction of existing and new products and the marketing
of such products, we are particularly dependent on our ability to identify,
attract, motivate and retain qualified managers, engineers and salespersons.
The loss of the services of a significant number of our engineers or sales
people or one or more of our senior officers or managers could be disruptive to
our development efforts or business relationships and could seriously harm our
business.

  We face the risk of being unable to integrate effectively businesses or
   assets that we acquire.

  The recent acquisition of Entrega and certain assets of the Rex product line,
including intellectual property, inventory and fixed assets, from Franklin
Electronic Publishers must be integrated with our existing business structure.
If we fail to integrate Entrega and the Rex assets within our business
effectively or fail to do so with acquisitions that we have made in the past or
may make in the future, we may face disruptions to our business activities and
our business may be seriously harmed.

  We face the risk of being unable to renew our tax holiday status in Malaysia.

  We have received tax holiday status on our manufacturing operations in
Malaysia. Under this tax holiday, the earnings of our manufacturing subsidiary
are not taxable in Malaysia. This tax holiday expires in 2000, and we cannot be
assured that we will be able to renew or extend this tax holiday.

  We face the risk of continued high volatility in our stock price.

  The market price of our common stock has been, and may continue to be,
subject to a high degree of volatility. Numerous factors relating to us or our
competitors may have a significant impact on the market price of our common
stock, including:

  . General conditions in the networking and computer industries;
  . Product pricing;
  . New products;
  . Market growth forecasts;
  . Technological innovations;
  . Acquisitions; and
  . Announcements of quarterly operating results.

In addition, stock markets have experienced extreme price volatility and broad
market fluctuations in recent years. This volatility has had a substantial
effect on the market price of securities issued by many high technology
companies, including ours, in many cases for reasons unrelated to the operating
performance of the specific companies. Our common stock has experienced
volatility not necessarily related to announcements of our performance.

                                       11
<PAGE>

  We face the risk that Year 2000 compliance issues could harm our business.

  The Year 2000 issue is the result of computer programs and hardware using two
digits rather than four to define the applicable year. Such computer programs
and hardware may have date-sensitive software or embedded chips that always
assume the century is "19". This could cause miscalculations or failure in our
affected information systems and/or manufacturing equipment. Such system
miscalculations or failure could disrupt our business operations by, for
example, causing a temporary inability to process transactions or engage in our
normal business activities. Such disruptions may also occur if our key
suppliers or customers experience disruptions in their ability to transact with
us due to Year 2000 issues.

Products

  We have reviewed and tested our PC Card, PortStation port expansion system,
and Rex products and believe they do not present any Year 2000 issues. Products
associated with the Entrega acquisition had been tested independently by
Entrega prior to our acquisition. Pursuant to that testing, Entrega had issued
its own statement on Year 2000 readiness of its products, in which Entrega
noted that its products were found to be fully Year 2000 compliant. In
addition, as part of our acquisition of the Rex product line, we have, where
applicable, secured representations, warranties, and/or certifications of Year
2000 compliance from key suppliers of operating software contained in such
products, and from parties selling products to us for our resale. We do not
believe any of our products will present any Year 2000 issues. All of our
products are used primarily as accessories to, and operate in dependence upon,
related systems. The related systems may themselves contain or demonstrate Year
2000 issues. We do not believe that any such Year 2000 issues in such systems
are or may be attributable to our products.

Internal IT and Non-IT Systems

  In relation to our internal systems, our plan to manage the Year 2000 issue
has involved four phases: inventory/assessment, remediation, testing, and
contingency planning.

  During late fiscal 1998 through early fiscal 1999, we performed our
inventory/assessment phase which analyzed the major information systems that
could be significantly affected by the Year 2000 issue and we engaged personnel
and resources to resolve potential issues. Through this initial analysis, we
concluded that the Year 2000 issue could be mitigated with respect to our
internal information systems and manufacturing equipment with modifications or
replacements of certain existing software and hardware where necessary or
advisable. Based on our analysis, we determined that we would be required to
modify or replace certain portions of our internal hardware and software so
that those systems would properly use dates beyond December 31, 1999.

  Our inventory/assessment plan for both information technology ("IT") and non-
IT systems is essentially completed. As part of the inventory/assessment phase,
we initiated communications to create awareness, both internally and
externally, of the need to identify Year 2000 issues and the risks the issues
create. We have collected and analyzed inventories of systems, equipment, and
processes from our global locations. Based on our inventory/assessment phase,
most of our significant systems were determined to be Year 2000 compliant. The
inventory/assessment indicated, however, that our customer interaction system
could be affected. This system was successfully replaced with a Year 2000
compliant system in May 1999 as part of the remediation phase of our project
noted below.

  The remediation phase involves reprogramming or replacing inventoried items.
We have completed the remediation phase with respect to our internal systems'
(IT and non-IT) Year 2000 exposure. Remediation of all systems classified as
"mission critical" was completed by March 31, 1999 and remediation of all
systems classified as "priority" was completed by June 30, 1999. Remediation of
the remaining systems, classified as "low impact", was completed by September
30, 1999.

                                       12
<PAGE>

  The testing phase included defining test plans, establishing appropriate test
environments, developing test cases, performing testing with appropriate
personnel, and certifying/documenting the results. The certification process
entailed having applicable in-house subject matter experts (i.e. functional
managers) review test results, including computer screens and printouts,
against pre-established criteria to ensure system(s) compliance. Additionally,
in relation to equipment used in our manufacturing lines, we engaged qualified
personnel from the applicable equipment manufacturer to perform run time on-
site testing in our manufacturing facility of the given manufacturer's
equipment. Services performed by such equipment manufacturer personnel included
installation of any applicable patches, upgrades, or other modifications, if
any, as necessary to ensure full Year 2000 compliance on the applicable
manufacturer's equipment. As of September 30, 1999, our testing phase was
substantially completed.

  We are developing a contingency plan for organizing responses in case of
shutdown of certain of our critical applications due to Year 2000 issues. This
contingency plan involves, among other things, IT and non-IT systems and
external systems. In addition, we have initiated plans to secure certain
contingent levels of key materials and components for stocking purposes near
the end of calendar year 1999. These efforts are intended to provide for any
unanticipated disruption in the supply chain affecting suppliers of designated
critical components. We believe that the most likely worst case of a Year 2000-
related failure within systems we manage, given our state of readiness today,
would be a temporary (i.e. recoverable and correctable) loss of 10% of our
internal IT capability with no material impact on our ability to conduct normal
revenue-generating operations.

External relationships

  Our global operations rely heavily on the infrastructures within the
countries in which they do business. The Year 2000 readiness within
infrastructure suppliers (utilities, government agencies, and shipping
organizations) will be crucial to our ability to avoid disruption of
operations.

  We have queried our significant suppliers regarding their Year 2000
readiness. To date, we are not aware of any such significant supplier with a
Year 2000 issue that would materially affect our operating results. While we
have no means of ensuring that all of our significant suppliers will be Year
2000 ready, we performed secondary evaluations, of our most critical suppliers
including site visits where deemed necessary, and found no Year 2000 issues
that we believe would lead to an interruption of our manufacturing schedules.
We could be materially impacted if our significant suppliers are unable to
resolve their Year 2000 issues in a timely fashion. The adverse effect on us of
non-compliance by these parties could adversely affect us.

Costs

  We have used both internal and external resources to replace, test and
implement IT and non-IT systems needing Year 2000 modifications. The total cost
of the Year 2000 project has been approximately $1.4 million and was funded by
cash flows from operations. Of the amounts incurred, approximately $660,000 was
expensed and $702,000 was capitalized for new software. As our Year 2000
efforts are substantially complete, we do not expect to incur significant
future costs related to this project.

                                       13
<PAGE>

                                USE OF PROCEEDS

  The net proceeds from the sale of securities offered by this prospectus will
be used for general corporate purposes, including capital expenditures. We
expect from time to time to evaluate the acquisition of businesses, products
and technologies for which a portion of the net proceeds may be used. Pending
such uses, we will invest the net proceeds in interest-bearing securities.

                                DIVIDEND POLICY

  We have never declared or paid any cash dividend on the corporation's capital
stock and do not anticipate paying any cash dividends on such stock in the
foreseeable future. We currently intend to retain future earnings, if any, for
use in our business.

                          PRICE RANGE OF COMMON STOCK

  The following table presents the high and low closing stock price for
Xircom's Common Stock as quoted on The Nasdaq National Market for fiscal years
1998 and 1999 and fiscal year 2000 to date.

<TABLE>
<CAPTION>
                                                               High       Low
   Fiscal 2000                                               --------- ---------
   <S>                                                       <C>       <C>
     October 1 to November 17, 1999......................... $55 1/2   $43 1/4

   Fiscal 1999
     July 1 to September 30................................. $47 7/16  $30 7/32
     April 1 to June 30..................................... $30 1/16  $18 13/16
     January 1 to March 31.................................. $45 1/4   $23 15/16
     October 1 to December 31, 1998......................... $35 17/32 $17 1/2

   Fiscal 1998
     July 1 to September 30................................. $27 1/16  $14 3/4
     April 1 to June 30..................................... $17 5/16  $13 3/8
     January 1 to March 31.................................. $14 1/4   $ 9 9/16
     October 1 to December 31, 1997......................... $12 3/8   $ 9
</TABLE>

                                       14
<PAGE>

                                 CAPITALIZATION

  The table below sets forth the following information:

  .  our capitalization as of September 30, 1999, after giving retroactive
     effect to the acquisition of Entrega consummated on October 1, 1999,
     accounted for using the pooling-of-interests accounting method; and

  .  our capitalization as adjusted to give effect to (i) our repayment on
     October 1, 1999 of Entrega's indebtedness of $9.138 million in part by
     cash and in part in shares, and (ii) the sale of the 3,500,000 shares of
     common stock we are offering hereby at an assumed initial offering price
     of $52.50 per share after deducting underwriter's discounts and
     commissions and estimated offering expenses.

<TABLE>
<CAPTION>
                                                           September 30, 1999
                                                         ------------------------
                                                          Actual    As Adjusted
                                                         ---------- -------------
                                                         (in thousands, except
                                                           share information)
<S>                                                      <C>        <C>
Cash and cash equivalents............................... $  135,630   $ 304,655

Notes payable...........................................      9,138         --
Shareholders' equity:
  Preferred Stock, 2,000,000 shares authorized, none
   issued...............................................
  Common Stock, $.001 par value, 50,000,000 shares
   authorized; 24,563,614 shares outstanding at
   September 30, 1999, 28,171,685 shares outstanding as
   adjusted(1)..........................................         24          28
  Paid-in capital.......................................    151,925     330,084
  Retained earnings.....................................     22,971      22,971
                                                         ----------  ----------
    Total shareholders' equity..........................    174,920     353,083
                                                         ----------  ----------
    Total capitalization................................ $  184,058  $  353,083
                                                         ==========  ==========
</TABLE>
- --------
(1) Excludes 4,537,062 shares issuable upon exercise of outstanding stock
    options as of September 30, 1999 (which number includes shares issuable
    upon exercise of assumed Entrega options), and excludes 34,327 shares
    issued to Entrega's financial advisors upon the closing of the Entrega
    transaction.

                                       15
<PAGE>

                            SELECTED FINANCIAL DATA

  The following table presents selected balance sheet and statement of
operations data as of and for the fiscal years ended September 30, 1995 through
1999. This data gives retroactive effect to our acquisition of Entrega on
October 1, 1999. The acquisition was accounted for as a pooling-of-interests.

<TABLE>
<CAPTION>
                                   1995      1996      1997      1998     1999
                                 --------  --------  --------  -------- --------
                                   (in thousands, except per share amounts)
<S>                              <C>       <C>       <C>       <C>      <C>
Statement of Operations Data:
Net sales......................  $119,528  $166,757  $184,575  $276,947 $424,436
Cost of sales..................    79,048   107,437   126,300   179,377  243,248
                                 --------  --------  --------  -------- --------
Gross profit...................    40,480    59,320    58,275    97,570  181,188
Operating Expenses:
  Research and development
   expenses....................    13,085     9,537    12,799    16,599   24,557
  Sales and marketing
   expenses....................    37,086    32,723    43,012    50,699   87,348
  General and administrative
   expenses....................     7,031     6,543     8,259    10,757   15,143
  In-process research and
   development and other
   nonrecurring charges(1).....     5,745     1,505     2,163       --     4,596
                                 --------  --------  --------  -------- --------
Operating income (loss) from
 continuing operations.........   (22,467)    9,012    (7,958)   19,515   49,544
Other income (expense), net....       435    (1,338)    3,172     4,191    1,785
                                 --------  --------  --------  -------- --------
Income (loss) from continuing
 operations before income
 taxes.........................   (22,032)    7,674    (4,786)   23,706   51,329
Income tax provision
 (benefit).....................    (7,000)    2,506    (1,437)    7,852   16,724
                                 --------  --------  --------  -------- --------
Income (loss) from continuing
 operations(1).................   (15,032)    5,168    (3,349)   15,854   34,605
Discontinued operations:
Operating income (loss), net of
 income taxes..................   (43,772)      784      (226)      --       --
Loss on disposal, net of income
 taxes.........................       --        --     (6,275)      --       --
                                 --------  --------  --------  -------- --------
Net income (loss)(1)...........  $(58,804) $  5,952  $ (9,850) $ 15,854 $ 34,605
                                 ========  ========  ========  ======== ========
Diluted earnings (loss) per
 share(1):
  Continuing operations........  $  (0.88) $   0.26  $  (0.16) $   0.68 $   1.35
  Net income (loss)............  $  (3.44) $   0.30  $  (0.46) $   0.68 $   1.35
Balance Sheet Data:
Working capital................  $ 25,909  $ 34,711  $ 95,501  $116,062 $135,480
Total assets...................  $ 85,649  $107,201  $147,930  $197,935 $275,496
Long-term obligations, net of
 current portion...............  $    597  $  1,860  $    --   $    --  $    --
Shareholders' equity...........  $ 53,095  $ 65,603  $113,427  $134,751 $174,920
</TABLE>
- --------
(1) Fiscal 1999 includes $4,596 ($3,309 net of tax benefit) or $0.13 per share
    for write-off of in-process research and development and other nonrecurring
    charges. Fiscal 1997 includes $2,163 ($1,514 net of tax benefit) or $0.07
    per share for write-off of in-process research and development. Fiscal 1996
    includes $1,505 ($1,023 net of tax benefit) or $0.05 per share for loss on
    sale of Netwave product line. Fiscal 1995 includes $5,745 ($3,561 net of
    tax benefit) or $0.21 per share for other nonrecurring charges.

                                       16
<PAGE>

                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

  This discussion contains trend analysis and other forward-looking statements
within the meaning of Section 27A of the Securities Act of 1933, as amended,
and Section 21E of the Securities Exchange Act of 1934, as amended. Actual
results could differ materially from those projected in the trend analysis and
other forward-looking statements contained herein, as a result of the risk
factors set forth below and other cautionary language contained elsewhere in
this prospectus.

Overview

  We are a leading global provider of mobile networking and information access
solutions for mobile professionals. Our products enable connectivity between
notebook and handheld computer devices and corporate networks, the Internet and
other online services from a wide variety of locations.

  We were incorporated in 1988 and shipped our first product in 1989. In 1992,
we were the first company in the industry to ship a LAN adapter in the PC Card
form factor, compliant with the standards set by the Personal Computer Memory
Card International Association (also known as PCMCIA Cards). We expanded our
product offerings in 1994 to include the first combo LAN and modem PC Cards. We
believe combo cards continue to represent the fastest growing segment of the PC
Card market. In 1998, we introduced our RealPort family of Integrated PC Cards,
which eliminates the need for pop-out jacks and external cables. During
February 1999, we began shipping 56K modems in the MiniPCI form factor,
providing OEMs a flexible and low cost configuration alternative for
communications functionality in notebook computers and handheld PCs. During
June 1999, we began shipping our first products for handheld computers--the
CompactCard line for Windows CE machines. In 1999, we entered the USB port
expansion market with the introduction of our PortStation port expansion system
products, a line of configurable products designed to offer a broad set of
access and port expansion capabilities to both enterprise and small office/home
office users through a single USB connection to a PC.

  We recently completed two acquisitions intended to expand our product
offerings and enhance our leading position in the mobile networking market. On
September 27, 1999, we completed the acquisition of certain assets of the Rex
product line, including intellectual property, inventory and fixed assets, from
Franklin Electronic Publishers. The Rex line of portable information devices
allows customers to access personal data at any location. On October 1, 1999,
we completed the acquisition of Entrega, a leader in the USB port expansion
market. Entrega provides standardized devices for peripheral-to-PC
connectivity, including USB hubs, port converters and cables for PC and
Macintosh platforms. We expect from time to time to continue to evaluate the
acquisition of additional businesses, products and technologies.

  Our net sales consist primarily of sales of our mobile networking and
information access products. We recognize revenue from product sales when
shipped. We make a provision for the estimated amount of product returns or
credits that may occur under these contracts in the period of sale and have a
policy of reserving channel inventory held by our customers in excess of one
month supply. We record a provision for product returns and credits based on
both contractual agreements, which allows distributors and dealers to return
products or receive price protection credits under certain circumstances, and
historical return rates. We sell our products primarily through domestic and
international distributors as well as to a number of OEM customers.

  Our cost of sales consists of materials, labor, manufacturing overhead and
other costs of sales. Other costs of sales include provisions for excess and
obsolete inventory, warranty expense and royalty payments to licensors of
software incorporated into our products. Our gross margin is affected by our
product mix and from the proportion of net sales derived from sales to OEMs,
which typically carry lower gross margins than sales through our distribution
partners.

  Research and development expenses consist primarily of labor and project
materials and are expensed as incurred.

                                       17
<PAGE>

  Sales and marketing expenses consist primarily of salaries, commissions and
marketing, advertising and promotional activities.

  General and administrative expenses consist primarily of salaries and related
expenses, finance, accounting and human resources expenses, professional fees,
bad debt expenses and other general corporate expenses.

Quarterly Results of Operations

<TABLE>
<CAPTION>
                                                                 Quarter Ended
                          ----------------------------------------------------------------------------------------------
                          December 31, March 31, June 30,  September 30, December 31, March 31,  June 30,  September 30,
                              1997       1998      1998        1998          1998       1999       1999       1999(1)
                          ------------ --------- --------  ------------- ------------ ---------  --------  -------------
                                                   (in thousands, except per share amounts)
<S>                       <C>          <C>       <C>       <C>           <C>          <C>        <C>       <C>
Statement of Operations Data:
Net sales...............    $52,545     $64,134  $71,312      $88,956      $98,498    $101,872   $108,439    $115,627
Cost of sales...........     34,417      42,546   47,118       55,296       59,064      58,643     61,634      63,907
                            -------     -------  -------      -------      -------    --------   --------    --------
Gross profit............     18,128      21,588   24,194       33,660       39,434      43,229     46,805      51,720
Operating expenses:
 Research and
  development expenses..      3,539       3,940    4,120        5,000        5,549       5,439      6,520       7,049
 Sales and marketing
  expenses..............     10,277      11,545   12,172       16,705       19,419      20,928     22,604      24,397
 General and
  administrative
  expenses..............      2,071       2,491    2,763        3,432        3,340       3,668      3,671       4,464
 In-process research and
  development and other
  nonrecurring charges..        --          --       --           --           --          --         --        4,596
                            -------     -------  -------      -------      -------    --------   --------    --------
Total operating
 expenses...............     15,887      17,976   19,055       25,137       28,308      30,035     32,795      40,506
                            -------     -------  -------      -------      -------    --------   --------    --------
Income from operations..      2,241       3,612    5,139        8,523       11,126      13,194     14,010      11,214
Other income, net.......      1,224         799      642        1,526          284         478        554         469
                            -------     -------  -------      -------      -------    --------   --------    --------
Income from operations
 before income taxes....      3,465       4,411    5,781       10,049       11,410      13,672     14,564      11,683
Income tax provision....      1,035       1,409    2,018        3,390        3,801       4,211      4,700       4,012
                            -------     -------  -------      -------      -------    --------   --------    --------
Net income..............    $ 2,430     $ 3,002  $ 3,763      $ 6,659      $ 7,609    $  9,461   $  9,864    $  7,671
                            =======     =======  =======      =======      =======    ========   ========    ========
Basic earnings per
 share..................    $  0.11     $  0.13  $  0.16      $  0.29      $  0.32    $   0.39   $   0.41    $   0.31
                            =======     =======  =======      =======      =======    ========   ========    ========
Diluted earnings per
 share..................    $  0.11     $  0.13  $  0.16      $  0.27      $  0.30    $   0.37   $   0.39    $   0.29
                            =======     =======  =======      =======      =======    ========   ========    ========
As a Percentage of Net Revenues:
Net sales...............      100.0%      100.0%   100.0%       100.0%       100.0%      100.0%     100.0%      100.0%
Gross profit............       34.5        33.7     33.9         37.8         40.0        42.4       43.2        44.7
Research and development
 expenses...............        6.7         6.1      5.7          5.6          5.6         5.3        6.0         6.1
Sales and marketing
 expenses...............       19.6        18.0     17.1         18.8         19.7        20.6       20.8        21.1
General and
 administrative
 expenses...............        3.9         3.9      3.9          3.8          3.4         3.6        3.5         3.8
In-process research and
 development and other
 non-recurring charges..        0.0         0.0      0.0          0.0          0.0         0.0        0.0         4.0
                            -------     -------  -------      -------      -------    --------   --------    --------
Total operating
 expenses...............       30.2        28.0     26.7         28.2         28.7        29.5       30.3        35.0
                            -------     -------  -------      -------      -------    --------   --------    --------
Income from operations..        4.3         5.6      7.2          9.6         11.3        12.9       12.9         9.7
Other income, net.......        2.3         1.3      0.9          1.7          0.3         0.5        0.5         0.4
                            -------     -------  -------      -------      -------    --------   --------    --------
Income from operations
 before income taxes....        6.6         6.9      8.1         11.3         11.6        13.4       13.4        10.1
Income tax provision....        2.0         2.2      2.8          3.8          3.9         4.1        4.3         3.5
                            -------     -------  -------      -------      -------    --------   --------    --------
Net income..............        4.6%        4.7%     5.3%         7.5%         7.7%        9.3%       9.1%        6.6%
                            =======     =======  =======      =======      =======    ========   ========    ========
</TABLE>
- -------
(1) The fourth quarter of fiscal 1999 includes $4,596 ($3,309 net of tax
    benefit) or $0.13 per diluted share for write-off of in-process research
    and development and other nonrecurring charges.

                                       18
<PAGE>

Net sales

  Over the eight quarters ended September 30, 1999, our quarterly sales
increased from $52.5 million to $115.6 million. Our quarterly sales have grown
in each of the eight quarters ended September 30, 1999 primarily due to growth
in the overall demand for local and wide area network connectivity products,
increasing unit sales of our adapter products by our distributors and OEM
customers and the introduction of new products such as our RealPort Integrated
PC Card family of products.

Gross profit

  Over the eight quarters ended September 30, 1999, our quarterly gross profit
increased from 34.5% of quarterly sales to 44.7% of quarterly sales. Our gross
profit as a percentage of net sales has increased in each of the eight
quarters, except the quarter ended March 31, 1998, primarily due to:

  . The higher gross margins of our RealPort Integrated PC Card family of
    products, which began shipping in the quarter ended June 30, 1998, versus
    the comparably featured Type II PC Card products;

  . Increased mix and sales volumes of our PC Card LAN adapters and PC Card
    LAN+Modem adapters, which typically generate higher gross profit margins
    than our other products, and decreased sales of modem-only products to
    our OEM customers, which generate lower gross profit margins than sales
    made through our distribution partners; and

  . Decreased fixed manufacturing costs as a percentage of sales.

Operating expenses

  Operating expenses increased in absolute amounts in each of the eight
quarters ended September 30, 1999, and as a percentage of net sales, these
expenses increased in each of these quarters, except in the quarters ended
December 31, 1997, and March 31, 1998, due to increased staffing and the
expansion of sales and marketing activities.

Results of Operations

<TABLE>
<CAPTION>
                                                            Year ended
                                                           September 30,
                                                         --------------------
                                                         1997    1998   1999
                                                         -----   -----  -----
<S>                                                      <C>     <C>    <C>
As a Percentage of Net Revenue:
Net sales............................................... 100.0 % 100.0% 100.0%
Cost of sales...........................................  68.4    64.8   57.3
                                                         -----   -----  -----
Gross profit............................................  31.6    35.2   42.7
Operating expenses:
  Research and development expenses.....................   6.9     6.0    5.8
  Sales and marketing expenses..........................  23.3    18.3   20.6
  General and administrative expenses...................   4.5     3.9    3.5
In-process research and development and other
 nonrecurring charges...................................   1.2     0.0    1.1
                                                         -----   -----  -----
Operating income (loss) from continuing operations......  (4.3)    7.0   11.7
Other income, net.......................................   1.7     1.5    0.4
                                                         -----   -----  -----
Income (loss) from continuing operations before income
 taxes..................................................  (2.6)    8.5   12.1
Provision for income taxes..............................  (0.8)    2.8    3.9
                                                         -----   -----  -----
Income (loss) from continuing operations................  (1.8)%   5.7%   8.2%
                                                         =====   =====  =====
</TABLE>

                                       19
<PAGE>

Net Sales

 Net sales--1999 versus 1998

  Net sales increased 53% to $424.4 million in fiscal 1999 from $276.9 million
in fiscal 1998. We derive net sales principally from shipments of Ethernet PC
Card adapters, modems and multifunction Ethernet and modem cards ("Combo
cards") (collectively "adapter products"), which connect notebook PCs to
networks, the Internet and online services. The increase in net sales in 1999
from 1998 was primarily due to increased shipments of Ethernet PC Cards and
Combo cards. We attribute this increase to growth in overall market demand for
local and wide area network connectivity products and an increase in unit sales
of our adapter products by our distribution customers (the "branded" business)
and OEM customers. We believe this growth in sales of our adapter products in
our branded business and by OEM customers may be indicative of several factors:

  . Increased growth rate in shipments of notebook PCs, which in turn require
    network and modem connections;

  . An increase in the rate that notebook PCs are attached to information
    sources;

  . Continuing increased market acceptance of our Combo cards and Fast
    Ethernet cards; and

  . Increased market acceptance of our RealPort Integrated PC Card family of
    products.

  We also introduced our port expansion system products in 1999 through the
acquisition of Entrega on October 1, 1999, which was accounted for as a
pooling-of-interests, and in addition, we began shipping Xircom PortStation
port expansion system products in September 1999.

  These increases were partially offset by a decrease in the volume of lower
margin modem-only product sales we made to our OEM customers. Unit shipments of
adapter products increased 47% in 1999 over 1998 but average selling prices
declined due to increased competition in the market for adapter products.
Revenues from our products as a percentage of total revenues were as follows:

<TABLE>
<CAPTION>
                                                                    Year ended
                                                                  September 30,
                                                                  ----------------
                                                                  1997  1998  1999
                                                                  ----  ----  ----
   <S>                                                            <C>   <C>   <C>
   PC Card LAN+Modem Adapters....................................  43%   48%   57%
   PC Card LAN Adapters..........................................  42%   30%   28%
   PC Card Modem Adapters........................................  11%   21%   10%
   Port expansion system products................................  --    --     4%
   Other.........................................................   4%    1%    1%
</TABLE>

  Total international sales (shipments to our customers located outside the
U.S.) as a percentage of total sales was 53% in 1999 and 52% in both 1998 and
1997. Sales of our PC Cards in Europe grew at a faster rate than in the U.S.

 Net sales--1998 versus 1997

  Net sales increased 50% to $276.9 million in fiscal 1998 from $184.6 million
in fiscal 1997 due to increased shipments of our adapter products. We attribute
the increase in net sales primarily to growth in overall market demand for
local and wide area network connectivity products and an increase in unit sales
of our adapter products by our distribution and OEM customers. During the
fourth quarter of fiscal 1997, we reduced shipments to our distributors in
order to reduce the levels of inventories they hold and to enable us to quickly
react to market changes. Unit shipments of our adapter products increased 54%
in 1998 over 1997 but average selling prices declined due to increased
competition in the PC Card LAN adapter market and a greater mix of revenue sold
through OEM partners where average selling prices are generally lower.

                                       20
<PAGE>

Gross Profit

 Gross profit--1999 versus 1998

  Gross profit consists of net sales less cost of sales. Cost of sales includes
materials, labor, manufacturing overhead and other costs of sales. Other costs
of sales include provisions for excess and obsolete inventory, warranty expense
and royalty payments to licensers of software incorporated into our products.
The increase in gross profit as a percent of net sales in 1999 compared to 1998
was primarily attributable to:

  . The higher gross margins of our RealPort Integrated PC Card family of
    products, which began shipping in the third quarter of fiscal 1998,
    versus the comparably featured Type II PC Card products;

  . A decrease in our fixed manufacturing costs as a percentage of sales; and

  . A decrease in the sales volume of our modem-only products, which
    typically generate lower gross profit margins than our other products,
    and in particular, reduced sales of modem-only products to our OEM
    customers, which generate lower gross profit margins than sales made
    through our distribution partners.

  This increase in gross profit as a percent of net sales was partially offset
by the relatively lower gross profit as a percent of net sales earned by
Entrega during 1999, as compared to that of Xircom's traditional products.

 Gross profit--1998 versus 1997

  The increase in gross profit as a percent of net sales in 1998 compared to
1997 was primarily attributable to a decrease in fixed manufacturing costs as a
percentage of sales. In addition, the RealPort Integrated PC Card family of
products, which began shipping in the third quarter of fiscal 1998, has higher
gross margins than the comparably featured Type II PC Card products. This
increase in the gross profit percentage was partially offset by the increase in
modem-only product sales to our OEM customers at lower gross profit margins
than sales made through the Company's distribution partners, and by lower
average selling prices on adapter products.

Research and Development

  Our research and development expenses increased in 1999 in absolute dollars
compared to 1998 as a result of our decision to increase staffing and
expenditures to support expanded branded and OEM product offerings, including
our PortStation port expansion system and the CompactCard line of products.
Research and development expenses increased in 1998 in absolute dollars
compared to 1997. This increase was a result of additional staffing and
expenditures to support expanded branded and OEM product offerings, including
our RealPort Integrated PC Card family of products, and expenditures by Entrega
during 1999. We expect total expenditures for research and development to
increase in fiscal 2000 due to our planned expenditures on product enhancements
and new product introductions.

Sales and Marketing

  We increased sales and marketing expenses in 1999 in both absolute dollars
and as a percentage of net sales as compared to 1998 primarily due to:

  . Additional staffing and sales and marketing activities required to
    support expanded branded markets;

  . The opening and operation of a new regional headquarters in Tokyo, Japan;

  . Expansion of our OEM sales organization;

  . Expenses to support the launch of new products such as the PortStation
    Port expansion system and the CompactCard line of products; and

  . Expenses incurred by Entrega during 1999, to support the launch of its
    line of port expansion system products.

                                       21
<PAGE>

  As we pursue further product and market expansion activities, we expect sales
and marketing expenses for fiscal 2000 to increase.

  Our sales and marketing expenses increased in 1998 and decreased as a
percentage of net sales as compared to 1997. The increase in expenses were due
to sales and marketing activities and additional staffing required to support
expanded branded markets and establishment of our OEM sales organization.
Partially offsetting these increases were the lower sales and marketing
expenditures that generally are associated with OEM sales versus branded
business sales, reduced expenses associated with lower levels of inventories
maintained by distributors, and cooperative advertising reimbursements. Sales
and marketing expenses were higher as a percentage of net sales in 1997 because
we reduced the volume of our shipments to our distributors during the fourth
quarter of fiscal 1997 in order to reduce the levels of inventories they held.

General and Administrative

  Our general and administrative expenses increased in 1999 as compared to 1998
to support growth in our organization and, to a lesser extent, continued
expenditures on our information systems hardware and software, including Year
2000 upgrades. During 1998, we initiated modification efforts of computer
software issues associated with the Year 2000 project. General and
administrative expenses include costs incurred by Entrega to build its
infrastructure and grow its operations. We expect general and administrative
expenses to increase during fiscal 2000 due to the need to support growth in
our organization and continued expansion of information systems hardware and
software. In addition, during the first quarter of fiscal 2000, we expect to
incur transaction and transition-related expenses for Entrega of approximately
$2,500,000 to $3,000,000. See "Risk Factors" for a further discussion of our
Year 2000 project.

In-process Research and Development and Other Nonrecurring Charges

  In the fourth quarter of fiscal 1999, we recorded a charge to operations of
$2,364,000 ($1,702,000 net of tax benefit) for future operating lease payments
related to facilities we will vacate, and a charge of $2,232,000 ($1,607,000,
net of tax benefit) for the write-off of in-process research and development in
connection with the purchase of the Rex product line. The total lease payment
accrual is net of expected sublease income and does not include any period in
which we will continue to occupy the facility. The Rex product line was
acquired from Franklin Electronic Publishers Incorporated, a developer and
marketer of handheld electronic reference products. In fiscal 1997, we recorded
a charge to operations of $2,163,000 ($1,514,000, net of tax benefit) for the
write-off of in-process research and development in connection with the
purchase of certain assets from Angia Communications, Inc., a developer and
manufacturer of PC Card products.

  We based the amounts allocated to in-process research and development on
established valuation techniques in the high technology industry. At the date
of each acquisition mentioned above, the projects associated with the in-
process efforts had not yet reached technological feasibility and the research
and development in process had no alternative future uses. Accordingly, we
charged these amounts to expense on the respective dates of each acquisition.

Other Income, Net

  Net other income includes interest income from the investment of available
cash and net gains on our foreign currency transactions. This amount is offset
by discounts earned by our customers on early payments, interest expense, and
losses on disposals of fixed assets. Our interest income was $4,911,000,
$4,256,000 and $2,195,000, and our net foreign currency transaction gains were
$438,000, $1,426,000 and $2,119,000, in 1999, 1998 and 1997, respectively. Net
other income for 1999 decreased as compared to 1998 primarily due to an
increase in discounts earned by our customers on early payments to us, a
decrease in gains on our foreign currency transactions, and an increase in
interest expense relating to Entrega. Net other income for 1998 increased as
compared to 1997 primarily due to higher interest income and lower interest
expense in 1998 as a result of increased cash and cash equivalents and reduced
borrowings under credit facilities.

                                       22
<PAGE>

Income Tax Provision

  Our effective tax rate was 32.6% in 1999, 33.1% in 1998, and 30.0% in 1997.
The difference between our effective tax rates during these years and the 35%
federal statutory tax rate was due primarily to benefits we received from the
tax holiday status of our manufacturing operations in Malaysia, which expires
in 2000. We intend to seek renewal of this tax holiday before its expiration
but cannot assure that this renewal will be received. In fiscal 1999 we began
using tax preferred investment vehicles for our cash equivalents to further
reduce our effective tax rate. An income tax benefit has not been recorded for
the losses attributable to Entrega during the 1999 and 1998 fiscal years since
such losses have been utilized at the shareholder level based on Entrega's S-
Corporation status during those periods. We expect an effective tax rate of 28%
for our 2000 fiscal year.

Discontinued Operations

  Discontinued operations in 1997 include the financial results of Netaccess,
our subsidiary, which included remote access server and multi-port modem
products sold to OEMs and through two-tier distribution channels. On June 30,
1997, we completed the sale of Netaccess resulting in a loss of $6,275,000, net
of income tax benefit. Operating loss from discontinued operations, net of
income taxes, for 1997 was $226,000.

Net Income

  Net income and net income per diluted share for 1999, excluding acquisition-
related costs and other nonrecurring charges, was $37,914,000 and $1.48,
respectively, compared to $15,854,000 and $0.68, respectively, for 1998. Net
income and net income per diluted share for 1999 was $34,605,000 and $1.35,
respectively, compared to $15,854,000 and $0.68, respectively, for 1998.

Liquidity and Capital Resources

  As of September 30, 1999 we had $135.6 million in cash and cash equivalents.
Our continuing operating activities provided cash of approximately $61.4
million in 1999, primarily due to net income and increases in accounts payable
and other accrued liabilities, partially offset by increases in accounts
receivable, inventories and other current assets. Income taxes payable
increased primarily due to the timing of payments for income taxes. Accounts
payable and other accrued liabilities increased primarily due to the timing of
payments for component inventory purchases. Accounts receivable increased due
to higher fourth quarter net sales in 1999 versus that of 1998. Other current
assets increased due to a deposit paid during 1999 for securing contingent
rights to use certain intangible assets. Our use of these rights was contingent
upon approval of the transfer of these rights by the court having jurisdiction
over the assets. In September 1999 the court denied such approval and we became
entitled to a refund of the deposit, which was received in October 1999.

  We used $42.5 million in cash in investing activities in 1999, primarily for
capital expenditures and for an acquisition. The capital expenditures were for
the purchase of manufacturing equipment for use in our Penang, Malaysia
facility, information systems hardware and software, and equipment for
increased headcount. We used $13.3 million in cash to acquire the Rex product
line from Franklin Electronic Publishers Incorporated. We have no material
fixed commitments and do not expect an increase in the rate of capital
expenditures in the normal course of business during fiscal 2000.

  Our financing activities provided $10.9 million in cash in 1999, primarily
from the issuance of capital stock through our stock option and employee stock
purchase plans, tax benefits related to employee stock option and stock
purchase plans, and increases in notes payable, offset by net payment under
warrant agreement. On February 18, 1999, Intel Corporation exercised its
warrant to purchase additional shares of our common stock. Under the terms of
the warrant agreement, Intel elected to receive 514,314 shares at no additional
cost in lieu of purchasing 1,509,903 shares at an exercise price of $27.01.
Concurrent with the warrant exercise, we repurchased 514,314 shares of common
stock held by Intel for a total price of

                                       23
<PAGE>

$19.8 million, or $38.45 per share. We generated cash of $15.6 million from the
issuance of capital stock through our stock option and employee stock purchase
plans. In addition, we generated $8,549,000 in cash in 1999 from tax benefits
from our employee stock option and stock purchase plans.

  We have a bank credit facility for borrowings up to $25.0 million. Loans
under the agreement are secured by all of our U.S.-based assets. The agreement
expires in December 2000. We also have credit facilities totaling $5.3 million,
denominated in Malaysian ringgits, with banks in Malaysia. As of September 30,
1999, Entrega had borrowings of $4,988,000 outstanding under a line of credit
with a bank. This agreement expired and was fully repaid on October 1, 1999. As
of September 30, 1999, Entrega also had borrowings outstanding of $4,150,000
under notes payable to its former principal shareholder. On October 1, 1999,
the notes were converted into 142,397 shares of Xircom Common Stock. We had
approximately $30.3 million in borrowings available under our credit facilities
as of September 30, 1999.

  We believe that cash on hand, borrowings available under our existing
facilities or from other financing sources and cash provided by operations will
be sufficient to support our working capital and capital expenditure
requirements for at least the next twelve months. However, we cannot assure
that future cash requirements to fund operations will not require us to seek
additional capital sooner than the twelve months, or that such additional
capital will be available when required on terms acceptable to us.

Market Risk Disclosures

  The following discussion about our market risk disclosures involves forward-
looking statements. Actual results could differ materially from those projected
in the forward-looking statements.

  Given the short-term nature of our portfolio of highly liquid cash
equivalents, and that we have no borrowings outstanding, we are not subject to
significant interest rate risk.

  We manufacture the majority of our products in Malaysia and sell our products
worldwide. Our financial results, therefore, could be significantly impacted by
factors such as changes in foreign currency exchange rates and weak economic
conditions in foreign markets. Our operating results are exposed to the impact
of weakening economic conditions in the countries in which we sell our
products.

  Since the majority of our sales are denominated in U.S. dollars, our foreign
operations are net payers of currencies other than the U.S. dollar,
particularly the Malaysian ringgit and the Belgian franc. As such, our
operating results may be adversely affected by the impacts of a stronger
Malaysian ringgit or Belgian franc relative to the U.S. dollar. To mitigate the
short-term effect of changes in currency exchange rates on our foreign currency
based expenses, we purchase and hold Malaysian ringgits and Belgian francs in
advance of the due date of the underlying obligations. We do not otherwise
engage in any foreign currency risk hedging activity.

                                       24
<PAGE>

                          DESCRIPTION OF CAPITAL STOCK

  Our authorized capital stock consists of (1) 50,000,000 shares designated as
common stock, $0.001 par value, and (2) 2,000,000 shares designated as
preferred stock, $0.001 par value. The only equity securities currently
outstanding are shares of common stock. As of October 1, 1999, there were
approximately 24,671,685 shares of common stock issued and outstanding.

Common Stock

  Holders of common stock are entitled to receive dividends declared by the
Board of Directors, out of funds legally available for the payment of
dividends, subject to the rights of holders of preferred stock. Currently, we
are not paying a dividend. Each holder of common stock is entitled to one vote
per share. Upon any liquidation, dissolution or winding up of our business, the
holders of common stock are entitled to share equally in all assets available
for distribution after payment of all liabilities and provision for liquidation
preference of shares of preferred stock then outstanding. The holders of common
stock have no preemptive rights and no rights to convert their common stock
into any other securities. There are also no redemption or sinking fund
provisions applicable to the common stock.

  All outstanding shares of common stock are fully paid and nonassessable.

  Our common stock is listed on The Nasdaq National Market under the symbol
"XIRC." The transfer agent and registrar for the common stock is Equiserve.

Preferred Stock

  There are no shares of preferred stock outstanding. The Board of Directors
has the authority, without further action by the shareholders, to issue up to
2,000,000 shares of preferred stock in one or more series and to fix the
following terms of the preferred stock:

  .  designations, powers, preferences, privileges,

  .  relative participating, optional or special rights, and

  .  the qualifications, limitations or restrictions, including dividend
     rights, conversion rights, voting rights, terms of redemption and
     liquidation preferences.

  Any or all of these rights may be greater than the rights of the common
stock.

  The Board of Directors, without stockholder approval, can issue preferred
stock with voting, conversion or other rights that could negatively affect the
voting power and other rights of the holders of common stock. Preferred stock
could thus be issued quickly with terms calculated to delay or prevent a change
in control of Xircom or make it more difficult to remove our management.
Additionally, the issuance of preferred stock may have the effect of decreasing
the market price of the common stock.

                                       25
<PAGE>

                                  UNDERWRITING

  Under the terms and subject to the conditions contained in an underwriting
agreement dated             , 1999, we have agreed to sell to the underwriters
named below, for whom Credit Suisse First Boston Corporation, CIBC World
Markets Corp. and SG Cowen Securities Corporation are acting as
representatives, the following respective numbers of shares of common stock:

<TABLE>
<CAPTION>
                                                                      Number of
         Underwriter                                                   Shares
         -----------                                                  ---------
   <S>                                                                <C>
   Credit Suisse First Boston Corporation............................
   CIBC World Markets Corp...........................................
   SG Cowen Securities Corporation...................................
                                                                      ---------
     Total........................................................... 3,500,000
                                                                      =========
</TABLE>

  The underwriting agreement provides that the underwriters are obligated to
purchase all the shares of common stock in the offering if any are purchased,
other than those shares covered by the over-allotment option described below.
The underwriting agreement also provides that if an underwriter defaults, the
purchase commitments of the non-defaulting underwriters may be increased or the
offering of common stock may be terminated.

  We have granted to the underwriters a 30-day option to purchase on a pro-rata
basis up to 525,000 additional shares at the public offering price less the
underwriting discounts and commissions. The option may be exercised only to
cover any over-allotments of common stock.

  The underwriters propose to offer the shares of common stock initially at the
public offering price on the cover page of this prospectus and to selling group
members at that price less a concession of $   per share. The underwriters and
selling group members may allow a discount of $   per share on sales to other
broker/dealers. After the public offering of the common stock, the public
offering price and concession and discount to broker/dealers may be changed by
the representatives.

  The following table summarizes the compensation and estimated expenses we
will pay.

<TABLE>
<CAPTION>
                                           Per Share             Total
                                      ------------------- -------------------
                                       Without    With     Without    With
                                        Over-     Over-     Over-     Over-
                                      allotment allotment allotment allotment
                                      --------- --------- --------- ---------
   <S>                                <C>       <C>       <C>       <C>
   Underwriting Discounts and
    Commissions paid by us...........
   Expenses payable by us............
</TABLE>

  We and our directors and executive officers have agreed that we and they will
not offer, sell, contract to sell, pledge or otherwise dispose of, directly or
indirectly, or file with the Securities and Exchange Commission a registration
statement under the Securities Act relating to any shares of our common stock
or securities convertible into or exchangeable or exercisable for any shares of
our common stock, whether now owned or hereafter acquired, or publicly disclose
the intention to make any such offer, sale, pledge, disposition or filing,
without the prior written consent of Credit Suisse First Boston Corporation for
a period of 90 days after the date of this prospectus, except in the case of
issuances as a result of the grant of employee stock options outstanding on the
date of this prospectus, issuances of our common stock upon any exercise of
such options or the exercise of any other employee stock options outstanding on
the date of this prospectus. In addition, a transfer of such securities to a
family member or a trust will be permitted, provided that the transferee agrees
to be bound in writing by the restrictions in this paragraph.

  We have agreed to indemnify the underwriters against liabilities under the
Securities Act or contribute to payments which the underwriters may be required
to make in that respect.

  Our common stock is listed on The Nasdaq's National Market under the symbol
XIRC.


                                       26
<PAGE>

  The representatives may engage in over-allotment, stabilizing transactions,
syndicate covering transactions, penalty bids and "passive" market making in
accordance with Regulation M under the Securities Exchange Act of 1934.

  . Over-allotment involves syndicate sales in excess of the offering size,
    which creates a syndicate short position.

  . Stabilizing transactions permit bids to purchase the underlying security
    so long as the stabilizing bids do not exceed a specified maximum.

  . Syndicate covering transactions involve purchases of the shares of the
    common stock in the open market after the distribution has been completed
    in order to cover syndicate short positions.

  . Penalty bids permit the underwriters to reclaim a selling concession from
    a syndicate member when the shares of common stock originally sold by
    that syndicate member are purchased in a stabilizing transaction or a
    syndicate covering transaction to cover syndicate short positions.

  . In "passive" market making, market makers in the common stock who are
    underwriters or prospective underwriters may, subject to certain
    limitations, make bids for or purchases of the common stock until the
    time, if any, at which a stabilizing bid is made.

These stabilizing transactions, syndicate covering transactions and penalty
bids may cause the price of the common stock to be higher than it would
otherwise be in the absence of these transactions. These transactions may be
effected on The Nasdaq National Market or otherwise and, if commenced, may be
discontinued at any time.

                                       27
<PAGE>

                          NOTICE TO CANADIAN RESIDENTS

Resale Restrictions

  The distribution of the common stock in Canada is being made only on a
private placement basis exempt from the requirement that we prepare and file a
prospectus with the securities regulatory authorities in each province where
trades of common stock are effected. Accordingly, any resale of the common
stock in Canada must be made in accordance with applicable securities laws
which will vary depending on the relevant jurisdiction, and which may require
resales to be made in accordance with available statutory exemptions or
pursuant to a discretionary exemption granted by the applicable Canadian
securities regulatory authority. Purchasers are advised to seek legal advice
prior to any resale of the common stock.

Representations of Purchasers

  Each purchaser of common stock in Canada who receives a purchase confirmation
will be deemed to represent to us and the dealer from whom such purchase
confirmation is received that (i) such purchaser is entitled under applicable
provincial securities laws to purchase such common stock without the benefit of
a prospectus qualified under such securities laws, (ii) where required by law,
that such purchaser is purchasing as principal and not as agent, and (iii) such
purchaser has reviewed the text above under "Resale Restrictions".

Rights of Actions (Ontario Purchasers)

  The securities being offered are those of a foreign issuer and Ontario
purchasers will not receive the contractual right of action prescribed by
Ontario securities law. As a result, Ontario purchasers must rely on other
remedies that may be available, including common law rights of action for
damages or rescission or rights of action under the civil liability provisions
of the U.S. federal securities laws.

Enforcement of Legal Rights

  All of the issuer's directors and officers as well as the experts named
herein may be located outside of Canada and, as a result, it may not be
possible for Canadian purchasers to effect service of process within Canada
upon the issuer or such persons. All or a substantial portion of the assets of
the issuer and such persons may be located outside of Canada and, as a result,
it may not be possible to satisfy a judgment against the issuer or such persons
in Canada or to enforce a judgment obtained in Canadian courts against such
issuer or persons outside of Canada.

Notice to British Columbia Residents

  A purchaser of common stock to whom the Securities Act (British Columbia)
applies is advised that such purchaser is required to file with the British
Columbia Securities Commission a report within ten days of the sale of any
common stock acquired by such purchaser pursuant to this offering. Such report
must be in the form attached to British Columbia Securities Commission Blanket
Order BOR #95/17, a copy of which may be obtained from us. Only one such report
must be filed in respect of common stock acquired on the same date and under
the same prospectus exemption.

Taxation and Eligibility for Investment

  Canadian purchasers of common stock should consult their own legal and tax
advisors with respect to the tax consequences of an investment in the common
stock in their particular circumstances and with respect to the eligibility of
the common stock for investment by the purchaser under relevant Canadian
legislation.

                                       28
<PAGE>

                                 LEGAL MATTERS

  The validity of the issuance of the securities we are offering by this
prospectus will be passed upon for us by Wilson Sonsini Goodrich & Rosati,
Professional Corporation, Palo Alto, California and for the underwriters by
Shearman & Sterling, Menlo Park, California.

                                    EXPERTS

  Ernst & Young LLP, independent auditors, have audited our consolidated
financial statements and schedule included in our Annual Report on Form 10-K,
and have audited our supplemental consolidated financial statements and
schedule included herein and in our Current Report on Form 8-K for the year
ended September 30, 1999, as set forth in their reports, which are included and
incorporated by reference in this prospectus and elsewhere in the registration
statement. Our financial statements and supplemental financial statements, and
related schedules are included and incorporated by reference in reliance on
Ernst & Young LLP's reports, given on their authority as experts in accounting
and auditing.

                             ADDITIONAL INFORMATION

  We file reports, proxy statements and other information with the Commission,
in accordance with the Securities Exchange Act of 1934. You may read and copy
our reports, proxy statements and other information filed by us at the public
reference facilities of the Commission in Washington, D.C., New York, New York
and Chicago, Illinois. Please call the Commission at 1-800-SEC-0330 for further
information about the public reference rooms. Our reports, proxy statements and
other information filed with the Commission are available to the public over
the Internet at the Commission's World Wide Web site at http://www.sec.gov. Our
web address is http://www.xircom.com. Information on our website is not
incorporated by reference.

  We have filed a registration statement on Form S-3 under the Securities Act
of 1933 with respect to our common stock. This prospectus, which forms a part
of the registration statement, does not contain all of the information included
in the registration statement. Some information is omitted and you should refer
to the registration statement and its exhibits.

  The Commission allows us to "incorporate by reference" the information we
filed with them, which means that we can disclose important information by
referring you to those documents. The information incorporated by reference is
considered to be a part of this prospectus, and information that we file later
with the Commission will automatically update and supersede this information.
We incorporate by reference the documents listed below and any future filings
made by us with the Commission under Sections 13(a), 13(c), 14 or 15(d) of the
Exchange Act until our offering is complete:

  . Our Annual Report on Form 10-K for the fiscal year ended September 30,
    1999;
  . Our Current Report on Form 8-K dated November 10, 1999; and
  . Our Proxy Statement dated December 11, 1998 from Annual Meeting of
    Shareholders held on January 22, 1999.

  You may request a copy of these filings, at no cost, by writing or calling us
at the following address:

               Steven F. DeGennaro
               Chief Financial Officer
               Xircom, Inc.
               2300 Corporate Center Drive
               Thousand Oaks, California 91320
               (805) 376-9300

                                       29
<PAGE>


                               XIRCOM, INC.

          INDEX TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                           Page
                                                                           ----
<S>                                                                        <C>
Report of Ernst & Young LLP, Independent Auditors........................  F-2

Supplemental Consolidated Statements of Operations--Years ended September
 30, 1999, 1998 and 1997.................................................  F-3

Supplemental Consolidated Balance Sheets at September 30, 1999 and 1998..  F-4

Supplemental Consolidated Statements of Shareholders' Equity--Years ended
 September 30, 1999, 1998 and 1997.......................................  F-5

Supplemental Consolidated Statements of Cash Flows--Years ended September
 30, 1999, 1998 and 1997.................................................  F-6

Notes to Supplemental Consolidated Financial Statements..................  F-7
</TABLE>

                                      F-1
<PAGE>


             REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

The Board of Directors and Shareholders

Xircom, Inc.

  We have audited the accompanying supplemental consolidated balance sheets of
Xircom, Inc. (formed as a result of the consolidation of Xircom, Inc. and
Entrega Technologies, Inc.) as of September 30, 1999 and 1998, and the related
supplemental consolidated statements of operations, shareholders' equity and
cash flows for each of the three years in the period ended September 30, 1999.
The supplemental consolidated financial statements give retroactive effect to
the merger of Xircom, Inc. and Entrega Technologies, Inc. on October 1, 1999,
which has been accounted for using the pooling-of-interests method as described
in the notes to the supplemental consolidated financial statements. These
supplemental financial statements are the responsibility of the Company's
management. Our responsibility is to express an opinion on these supplemental
financial statements based on our audits.

  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.

  In our opinion, the supplemental financial statements referred to above
present fairly, in all material respects, the consolidated financial position
of Xircom, Inc. at September 30, 1999 and 1998, and the consolidated results of
its operations and its cash flows for each of the three years in the period
ended September 30, 1999, after giving retroactive effect to the merger of
Entrega Technologies, Inc., as described in the notes to the supplemental
consolidated financial statements, in conformity with generally accepted
accounting principles.

                                          /s/ Ernst & Young LLP

Woodland Hills, California

November 5, 1999

                                      F-2
<PAGE>


                               XIRCOM, INC.

            SUPPLEMENTAL CONSOLIDATED STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                                        Fiscal Years Ended
                                                           September 30
                                                    --------------------------
                                                      1999     1998     1997
                                                    -------- -------- --------
                                                    (In thousands, except per
                                                          share amounts)
<S>                                                 <C>      <C>      <C>
Net sales.......................................... $424,436 $276,947 $184,575
Cost of sales......................................  243,248  179,377  126,300
                                                    -------- -------- --------
Gross profit.......................................  181,188   97,570   58,275
  Research and development expenses................   24,557   16,599   12,799
  Sales and marketing expenses.....................   87,348   50,699   43,012
  General and administrative expenses..............   15,143   10,757    8,259
  In-process research and development and other
   nonrecurring charges............................    4,596      --     2,163
                                                    -------- -------- --------
Total operating expenses...........................  131,644   78,055   66,233
                                                    -------- -------- --------
Operating income (loss) from continuing
 operations........................................   49,544   19,515   (7,958)
Other income, net..................................    1,785    4,191    3,172
                                                    -------- -------- --------
Income (loss) from continuing operations before
 income taxes......................................   51,329   23,706   (4,786)
Income tax provision (benefit).....................   16,724    7,852   (1,437)
                                                    -------- -------- --------
Income (loss) from continuing operations...........   34,605   15,854   (3,349)
Discontinued operations:
  Operating loss, net of income taxes..............      --       --      (226)
  Loss on disposal, net of income taxes............      --       --    (6,275)
                                                    -------- -------- --------
Net income (loss).................................. $ 34,605 $ 15,854 $ (9,850)
                                                    ======== ======== ========
Basic earnings (loss) per share:
  Continuing operations............................ $   1.44 $    .69 $   (.16)
  Discontinued operations..........................      --       --      (.30)
                                                    -------- -------- --------
  Net income (loss)................................ $   1.44 $    .69 $   (.46)
                                                    ======== ======== ========
Diluted earnings (loss) per share:
  Continuing operations............................ $   1.35 $    .68 $   (.16)
  Discontinued operations..........................      --       --      (.30)
                                                    -------- -------- --------
  Net income (loss)................................ $   1.35 $    .68 $   (.46)
                                                    ======== ======== ========
</TABLE>

                          See accompanying notes

                                      F-3
<PAGE>


                               XIRCOM, INC.

                 SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
                                                               September 30
                                                             -----------------
                                                               1999     1998
                                                             -------- --------
                                                              (In thousands,
                                                             except share and
                                                                 per share
                                                               information)
<S>                                                          <C>      <C>
Assets
Current assets:
  Cash and cash equivalents................................. $135,630 $105,814
  Accounts receivable, net of allowances for sales returns
   and bad debts of $11,891 ($8,614 in 1998)................   38,012   30,499
  Income tax receivable.....................................      300      285
  Inventories...............................................   23,563   16,965
  Deferred income taxes.....................................   15,195   11,659
  Prepaid expenses and other current assets.................    9,696    4,908
                                                             -------- --------
    Total current assets....................................  222,396  170,130
Property and equipment, net.................................   40,536   27,283
Other assets................................................   12,564      522
                                                             -------- --------
    Total assets............................................ $275,496 $197,935
                                                             ======== ========
Liabilities and shareholders' equity
Current liabilities:
  Notes payable............................................. $  9,138 $  3,125
  Accounts payable..........................................   31,591   18,558
  Accrued liabilities.......................................   42,235   29,077
  Accrued income taxes......................................    3,952    3,308
                                                             -------- --------
    Total current liabilities...............................   86,916   54,068
Deferred income taxes.......................................   13,660    9,116

Commitments and contingencies

Shareholders' equity:
  Preferred Stock, 2,000,000 shares authorized, none
   issued...................................................      --       --
  Common Stock, $.001 par value, 50,000,000 shares
   authorized; 24,563,614 shares outstanding at September
   30, 1999 (23,211,478 in 1998)                                   24       23
  Paid-in capital...........................................  151,925  146,362
  Retained earnings (accumulated deficit)...................   22,971  (11,634)
                                                             -------- --------
    Total shareholders' equity..............................  174,920  134,751
                                                             -------- --------
      Total liabilities and shareholders' equity............ $275,496 $197,935
                                                             ======== ========
</TABLE>

                          See accompanying notes

                                      F-4
<PAGE>


                               XIRCOM, INC.

       SUPPLEMENTAL CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY

<TABLE>
<CAPTION>
                                                           Retained
                                Common Stock               Earnings
                                -------------- Paid-in   (Accumulated
                                Shares  Amount Capital     Deficit)    Total
                                ------  ------ --------  ------------ --------
                                               (In thousands)
<S>                             <C>     <C>    <C>       <C>          <C>
Balance at September 30,
 1996.........................  19,731   $ 20  $ 83,221    $(17,638)  $ 65,603
Issuance of Common Stock......   2,516      3    51,358         --      51,361
Issuance of Common Stock under
 Employee Stock Purchase
 Plan.........................     125    --      1,259         --       1,259
Exercise of stock options.....     450    --      4,050         --       4,050
Tax benefit related to
 employee stock options.......     --     --      1,062         --       1,062
Repurchase of Common Stock,
 net..........................    (150)   --        (58)        --         (58)
Net loss......................     --     --        --       (9,850)    (9,850)
                                ------   ----  --------    --------   --------
Balance at September 30,
 1997.........................  22,672     23   140,892     (27,488)   113,427
Issuance of Common Stock......     123    --        500         --         500
Issuance of Common Stock under
 Employee Stock Purchase
 Plan.........................     160    --      1,370         --       1,370
Exercise of stock options.....     256    --      2,688         --       2,688
Tax benefit related to
 employee stock options.......     --     --        912         --         912
Net income....................     --     --        --       15,854     15,854
                                ------   ----  --------    --------   --------
Balance at September 30,
 1998.........................  23,211     23   146,362     (11,634)   134,751
Issuance of Common Stock......     126    --        741         --         741
Issuance of Common Stock under
 Employee Stock Purchase
 Plan.........................     123    --      2,066         --       2,066
Repurchase of Common Stock....    (514)   --    (19,775)        --     (19,775)
Exercise of stock warrants....     514    --        --          --         --
Exercise of stock options.....   1,104      1    13,552         --      13,553
Tax benefit related to
 employee stock options.......     --     --      8,549         --       8,549
Compensation expense related
 to stock options and stock
 appreciation rights..........     --     --        430         --         430
Net income....................     --     --        --       34,605     34,605
                                ------   ----  --------    --------   --------
Balance at September 30,
 1999.........................  24,564   $ 24  $151,925    $ 22,971   $174,920
                                ======   ====  ========    ========   ========
</TABLE>

                          See accompanying notes

                                      F-5
<PAGE>


                               XIRCOM, INC.

            SUPPLEMENTAL CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                      Fiscal Years Ended
                                                         September 30
                                                  ----------------------------
                                                    1999      1998      1997
                                                  --------  --------  --------
                                                        (In thousands)
<S>                                               <C>       <C>       <C>
Operating activities
Net income (loss) from continuing operations..... $ 34,605  $ 15,854  $ (3,349)
Adjustments to derive cash flows from continuing
 operating activities:
  Depreciation and amortization..................   13,939     7,993     6,499
  Deferred income taxes..........................    1,008     4,053     2,043
  Foreign currency exchange gains, net...........     (438)   (1,426)   (2,119)
  In-process research and development and other
   nonrecurring charges..........................    4,596       --      2,163
  Loss on disposal of fixed assets...............      320       153       320
  Other non-cash charges.........................      652        23       --
  Changes in assets and liabilities, net of the
   effect of acquisitions and disposition:
    Accounts receivable..........................   (9,508)  (19,602)   14,109
    Income tax receivable........................      (15)    4,721    (2,354)
    Inventories..................................   (3,689)   11,997   (15,191)
    Prepaid expenses and other current assets....   (4,573)   (2,398)      854
    Accounts payable and accrued liabilities.....   23,892    19,262     1,996
    Income taxes payable.........................      644     2,363      (121)
                                                  --------  --------  --------
Net cash provided by continuing operating
 activities......................................   61,433    42,993     4,850
Net cash used in discontinued operating
 activities......................................      --        --     (5,984)
                                                  --------  --------  --------
Net cash provided by (used in) operating
 activities......................................   61,433    42,993    (1,134)
Investing activities
Purchases of property and equipment..............  (27,255)  (18,555)   (6,437)
Proceeds from sale of fixed assets...............      113       203        35
(Increase) decrease in other assets..............   (2,150)       30       (17)
Proceeds from sale of Netaccess, Inc.............      --        --     11,000
Cash paid for acquisition........................  (13,250)      --     (1,463)
                                                  --------  --------  --------
Net cash provided by (used in) continuing
 investing activities............................  (42,542)  (18,322)    3,118
Net cash used in discontinued investing
 activities......................................      --        --       (501)
                                                  --------  --------  --------
Net cash provided by (used in) investing
 activities......................................  (42,542)  (18,322)    2,617
Financing activities
Proceeds from issuance of common stock...........   15,638     4,538    56,612
Tax benefit related to employee stock option and
 stock purchase plans............................    8,549       912     1,062
Repurchase of Common Stock.......................  (19,775)      --        --
Proceeds from issuance of debt obligations.......    8,538     3,125       960
Repayment of debt obligations....................   (2,025)   (2,541)   (6,385)
                                                  --------  --------  --------
Net cash provided by financing activities........   10,925     6,034    52,249
Net increase in cash and cash equivalents........   29,816    30,705    53,732
Cash and cash equivalents at beginning of
 period..........................................  105,814    75,109    21,377
                                                  --------  --------  --------
Cash and cash equivalents at end of period....... $135,630  $105,814  $ 75,109
                                                  ========  ========  ========
</TABLE>

                          See accompanying notes

                                      F-6
<PAGE>


                               XIRCOM, INC.

          NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS

NOTE ONE: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

 Basis of presentation

  The accompanying consolidated financial statements include the accounts of
Xircom, Inc. (the "Company") and its wholly-owned subsidiaries. All
intercompany balances and transactions have been eliminated. As further
described in Note Fourteen, the Company acquired Entrega Technologies, Inc.
("Entrega") on October 1, 1999. The acquisition was accounted for as a pooling-
of-interests. Accordingly, the supplemental consolidated financial statements
give retroactive effect to the merger of the Company and Entrega to reflect the
combined financial position and operations of the Company and Entrega for all
dates and periods presented. The supplemental consolidated financial statements
will become the historical financial statements upon issuance of financial
statements for the period that includes the date of the merger.

 Business

  The Company designs, develops, manufactures, markets and supports products
that enable users to connect mobile and remote notebook and handheld computers
to corporate networks, the Internet, intranets and other online resources from
a variety of locations.

 Reclassifications

  Certain reclassifications of previously reported amounts have been made to
conform to the current year's presentation.

 Cash and cash equivalents

  All highly liquid investments with a maturity of three months or less at the
date of purchase are considered to be cash equivalents and are carried at cost
plus accrued interest which approximates market value. Beginning in 1999, the
Company changed its investment strategy and began investing its excess cash
balances primarily in tax preferred investment vehicles. Interest income
totaled $4,911,000, $4,256,000 and $2,195,000 for fiscal 1999, 1998 and 1997,
respectively, and is included in Other income, net in the accompanying
Supplemental Consolidated Statements of Operations.

 Concentration of credit risk

  The Company sells its products primarily through two-tier distributors or
original equipment manufacturers. The Company makes periodic evaluations of the
creditworthiness of its customers and generally does not require collateral. To
date, the Company has not experienced any material bad debts or collection
problems. As of September 30, 1999 and 1998, three customers accounted for a
total of 36% and 34%, respectively, of total trade accounts receivable. The
carrying amounts reported in the balance sheets for accounts receivable,
accounts payable and notes payable approximate their fair value.

 Inventories

  Inventories are carried at the lower of cost (determined on a first-in,
first-out basis) or market.

 Property and equipment

  Property and equipment is stated at cost. Depreciation and amortization is
provided using the straight-line method over the estimated useful lives of the
assets, ranging from one to ten years. Leasehold improvements


                                      F-7
<PAGE>


                               XIRCOM, INC.

   NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

are amortized using the straight-line method over the term of the related lease
or the useful life of the asset, whichever is shorter.

 Revenue recognition

  The Company recognizes revenue from product sales when shipped. The Company
makes a provision for the estimated amount of product returns or credits that
may occur under these contracts in the period of sale and has a policy of
reserving channel inventory held by its customers in excess of one month
supply. The Company also has contractual agreements that permit distributors
and dealers to return products or receive price protection credits under
certain circumstances. The Company generally provides a lifetime limited
warranty against defects in the hardware component and a two-year limited
warranty on the software component of its network adapters and modem products.
The Company makes provisions for these costs in the period of sale. In
addition, the Company provides telephone support to purchasers of its products
as needed to assist them in installation or use of the products.

 Licensing agreements

  The Company has entered into agreements with third parties to license
software and hardware that is incorporated into or sold with certain of the
Company's products. Royalties associated with such licenses are accrued and
expensed as cost of goods sold when the products are shipped.

 Research and development

  Research and development costs are expensed as incurred.

 Advertising costs

  The Company expenses advertising costs as incurred. Advertising expense, net,
totaled $9,861,000, $4,032,000 and $4,753,000 for fiscal 1999, 1998 and 1997,
respectively.

 Nonrecurring charges

  In the fourth quarter of fiscal 1999, the Company recorded a charge to
operations of $2,364,000 ($1,702,000, net of tax benefit) for future operating
lease payments related to facilities it will vacate, and a charge of $2,232,000
($1,607,000, net of tax benefit) for the write-off of in-process research and
development in connection with the purchase of the Rex product line (see Note
Thirteen). The total lease payment accrual is net of estimated sublease income
and does not include any period in which the Company will continue to occupy
the facility.

  In fiscal 1997, the Company recorded a charge to operations of $2,163,000
($1,514,000, net of tax benefit) for the write-off of in-process research and
development in connection with the purchase of certain assets from Angia
Communications, Inc. (see Note Thirteen).

 Foreign currency exchange gains

  The functional currency of the Company's foreign subsidiaries is the U.S.
dollar. The majority of the Company's sales are denominated in U.S. dollars.
Net gains from foreign currency transactions and re-measurement totaled
$438,000, $1,426,000 and $2,119,000 for fiscal 1999, 1998 and 1997,
respectively, and are recognized currently in the Supplemental Consolidated
Statements of Operations.

                                      F-8
<PAGE>


                               XIRCOM, INC.

   NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

 Earnings per share

  Basic earnings per share is calculated using the weighted average common
shares outstanding for the period, and excludes dilutive securities. Diluted
earnings per share reflects the dilution to earnings that would occur if stock
options and other dilutive securities resulted in the issuance of common stock.
The weighted average number of shares used for basic and diluted earnings per
share were as follows:

<TABLE>
<CAPTION>
                                               Fiscal Years Ended September 30
                                               --------------------------------
                                                  1999       1998       1997
                                               ---------- ---------- ----------
<S>                                            <C>        <C>        <C>
Weighted average number of shares--basic...... 24,104,000 22,931,000 21,560,000
Effect of dilutive securities:
  Employee stock options......................  1,456,000    485,000        --
  Warrant.....................................     86,000        --         --
  Other dilutive securities...................     36,000     40,000        --
                                               ---------- ---------- ----------
Diluted....................................... 25,682,000 23,456,000 21,560,000
                                               ========== ========== ==========
</TABLE>

  Certain shares issuable under stock options in fiscal 1999, 1998 and 1997,
and warrants of 1,509,903 in fiscal 1998 and 1997 have been excluded from the
computation of diluted earnings per share because the effect would be
antidilutive.

 Effects of recent accounting pronouncements

  In June 1997, Statement of Financial Accounting Standards No. 131,
Disclosures About Segments of an Enterprise and Related Information ("SFAS
131") was issued. SFAS 131 establishes standards for the way that public
business enterprises report information about operating segments in annual
financial statements and requires that those enterprises report selected
information about operating segments in interim financial reports issued to
shareholders. It also establishes standards for related disclosures about
products and services, geographic areas, and major customers, as presented in
Notes One and Eleven. Based on the provisions of SFAS 131 and the manner in
which management analyzes its business, the Company has determined that it has
two separately reportable operating segments, as presented in Note Eleven.

  In March 1998, the American Institute of Certified Public Accountants issued
Statement of Position 98-1, Accounting for the Costs of Computer Software
Developed or Obtained for Internal Use ("SOP 98-1"). SOP 98-1, which was
adopted as of the beginning of fiscal 1999, requires capitalization of certain
costs incurred in connection with developing or obtaining internal use
software. The Company's previous accounting policy for internal use software
was generally consistent with the requirements of SOP 98-1. Accordingly, the
adoption of SOP 98-1 did not have a significant impact on the Company's
operating results or financial position.

  In June 1998, Statement of Financial Accounting Standards No. 133, Accounting
for Derivative Instruments and Hedging Activities ("SFAS 133") was issued,
which the Company is required to adopt effective October 1, 2000. Subsequently,
Statement No. 137, Accounting for Derivative Instruments and Hedging
Activities--Deferral of the Effective Date of FASB Statement No. 133 was
issued, which deferred the effective date of SFAS 133 for one year. SFAS 133
will require the Company to record all derivatives as assets or liabilities at
fair value. Gains or losses resulting from changes in the values of those
derivatives would be accounted for depending on the use of the derivatives and
whether it qualifies for hedge accounting. The impact of SFAS 133 on the
Company's financial statements will depend on a variety of factors, including,
the extent of the Company's hedging activities, the types of hedging
instruments used and the effectiveness of such instruments. The effect of
adopting SFAS 133 is currently being evaluated, however, the Company does not
believe the effects of adoption will be material to its financial position or
results of operations.

                                      F-9
<PAGE>


                               XIRCOM, INC.

   NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

 Use of estimates

  The preparation of the financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and
accompanying notes. Rapid technological change and short product life cycles
characterize the industry in which the Company operates. As a result, estimates
are required to provide for product returns, price protection, product
obsolescence and warranty returns. Historically, actual amounts recorded under
these programs have not varied significantly from estimated amounts. Actual
results may differ, however, from those estimates, although management does not
believe that any differences would materially affect the Company's financial
position or reported results.

 Stock options

  Employee stock options are accounted for under Accounting Principles Board
Opinion No. 25, "Accounting for Stock Issued to Employees," which requires the
recognition of expense when the option price is less than the fair value of the
stock at the date of grant. The Company generally awards options for a fixed
number of shares at an option price equal to the fair value at the date of
grant. The Company has adopted the disclosure-only provisions of Statement of
Financial Accounting Standards No. 123, "Accounting for Stock-Based
Compensation." See Note Eight.

NOTE TWO: DISCONTINUED OPERATIONS

  On March 31, 1997, the Company decided to discontinue its multi-port modem
and remote access server business, and on June 30, 1997, completed the sale of
Netaccess, Inc. ("Netaccess"), its remote access server subsidiary. Proceeds of
the sale were $11,000,000. Net sales of discontinued operations were
$13,185,000 for the year ended September 30, 1997. The accompanying financial
statements have been prepared to reflect the historical results of operations
and cash flows of Netaccess as discontinued operations for all periods
presented. See Note Nine for cash flow information for the discontinued
operations.

NOTE THREE: INVENTORIES

  Inventories consist of the following (in thousands):

<TABLE>
<CAPTION>
                                                                  September 30
                                                                 ---------------
                                                                  1999    1998
                                                                 ------- -------
     <S>                                                         <C>     <C>
     Finished goods............................................. $12,757 $ 4,478
     Sub-assemblies.............................................     492   1,092
     Work-in-process............................................   3,578   5,383
     Component parts............................................   6,736   6,012
                                                                 ------- -------
                                                                 $23,563 $16,965
                                                                 ======= =======
</TABLE>

                                      F-10
<PAGE>


                               XIRCOM, INC.

   NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

NOTE FOUR: PROPERTY AND EQUIPMENT

  Property and equipment consists of the following (in thousands):

<TABLE>
<CAPTION>
                                                               September 30
                                                             ------------------
                                                               1999      1998
                                                             --------  --------
     <S>                                                     <C>       <C>
     Land................................................... $  1,300  $    541
     Building and improvements..............................    4,709     3,925
     Leasehold improvements.................................    6,877     6,238
     Equipment..............................................   53,945    34,633
     Furniture and fixtures.................................    4,737     3,713
                                                             --------  --------
                                                               71,568    49,050
     Less accumulated depreciation and amortization.........  (31,032)  (21,767)
                                                             --------  --------
                                                             $ 40,536  $ 27,283
                                                             ========  ========
</TABLE>

NOTE FIVE: ACCRUED LIABILITIES

  Accrued liabilities consist of the following (in thousands):

<TABLE>
<CAPTION>
                                                                 September 30
                                                                ---------------
                                                                 1999    1998
                                                                ------- -------
     <S>                                                        <C>     <C>
     Payroll and related benefits.............................. $ 8,469 $ 6,828
     Warranty reserve..........................................   9,301   6,264
     Accrued marketing costs...................................   6,618   5,607
     Other.....................................................  17,847  10,378
                                                                ------- -------
                                                                $42,235 $29,077
                                                                ======= =======
</TABLE>

NOTE SIX: BANK BORROWINGS AND NOTES PAYABLE

  The Company has a credit facility with a bank for borrowings up to
$25,000,000 at the prime rate or at a LIBOR-based rate. Loans under the
agreement are secured by all U.S.-based assets of the Company. The agreement
expires in December 2000. As of September 30, 1999, there were no borrowings
outstanding under this agreement.

  The Company has credit facilities denominated in Malaysian ringgit with other
banks, that permit borrowings of up to $5,300,000 under bankers acceptance
agreements at the banks' prevailing market rate, and on a revolving credit and
term loan basis at the banks' reference rate plus 1.0% (7.8% as of September
30, 1999). As of September 30, 1999, no amounts were outstanding under these
credit facilities.

  Entrega had a $5,000,000 revolving line of credit with a bank at the prime
rate. Loans under the agreement were secured by Entrega's accounts receivable,
inventory, fixed assets, and general intangibles, and guaranteed by the former
principal shareholder of Entrega. As of September 30, 1999, borrowings of
$4,988,000 were outstanding under this agreement. The agreement expired and was
fully repaid on October 1, 1999. Entrega had notes payable to its former
principal shareholder bearing interest at 8% and subordinated to its line of
credit. During the year ended September 30, 1999, $500,000 of such notes were
converted into 85,817 shares of Common Stock. As of September 30, 1999,
borrowings of $4,150,000 were outstanding under such notes. On October 1, 1999,
the notes were converted into 108,071 shares of Xircom Common Stock.

                                      F-11
<PAGE>


                               XIRCOM, INC.

   NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

  The Company had approximately $30,271,000 available under its credit
facilities as of September 30, 1999. Interest expense totaled $555,000,
$115,000 and $478,000 for fiscal 1999, 1998 and 1997, respectively, and is
included in Other income, net.

NOTE SEVEN: INCOME TAXES

  The income tax provision (benefit) includes the following (in thousands):

<TABLE>
<CAPTION>
                                                         Fiscal Years Ended
                                                            September 30
                                                       ------------------------
                                                        1999     1998    1997
                                                       -------  ------  -------
     <S>                                               <C>      <C>     <C>
     Current:
       Federal........................................ $12,164  $  441  $(3,785)
       State..........................................   1,628     351      --
       Foreign........................................   3,440   2,516      945
                                                       -------  ------  -------
                                                        17,232   3,308   (2,840)
     Deferred:
       Federal........................................   1,515   4,544    1,403
       State..........................................     447     752   (1,754)
       Valuation allowance............................  (2,470)   (752)   1,754
                                                       -------  ------  -------
                                                          (508)  4,544    1,403
                                                       -------  ------  -------
                                                       $16,724  $7,852  $(1,437)
                                                       =======  ======  =======
</TABLE>

  Significant components of the Company's deferred tax assets and liabilities
are as follows (in thousands):

<TABLE>
<CAPTION>
                                                               September 30
                                                             ------------------
                                                               1999      1998
                                                             --------  --------
     <S>                                                     <C>       <C>
     Book reserves not deductible for tax................... $ 14,632  $ 11,302
     Book in excess of tax depreciation.....................    1,517     1,246
     Net operating loss carryforward and credit.............      --      3,155
                                                             --------  --------
       Total deferred tax asset.............................   16,149    15,703
     Valuation allowance....................................      --     (2,470)
                                                             --------  --------
       Deferred tax asset, net..............................   16,149    13,233
                                                             --------  --------
     Foreign operations.....................................  (12,489)   (9,662)
     Other..................................................     (609)   (1,028)
                                                             --------  --------
       Total deferred tax liabilities.......................  (13,098)  (10,690)
                                                             --------  --------
       Net deferred tax asset............................... $  3,051  $  2,543
                                                             ========  ========
</TABLE>

  Balance sheet classification of the net deferred tax asset is as follows (in
thousands):

<TABLE>
<CAPTION>
                                                              September 30
                                                            -----------------
                                                              1999     1998
                                                            --------  -------
     <S>                                                    <C>       <C>
     Current deferred tax asset............................ $ 15,195  $11,659
     Noncurrent deferred tax asset, included in other
      assets...............................................    1,516      --
     Noncurrent deferred tax liability.....................  (13,660)  (9,116)
                                                            --------  -------
                                                            $  3,051  $ 2,543
                                                            ========  =======
</TABLE>

                                      F-12
<PAGE>


                               XIRCOM, INC.

   NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

  In prior years, the Company established a valuation allowance against its
state net operating loss carryforwards to reflect the uncertainty of realizing
such deferred tax assets. In fiscal 1998, the valuation allowance was reduced
due to the realization of certain of these loss carryforwards. In fiscal 1999,
the remainder of the loss carryforwards was realized and, accordingly, the
related valuation allowance of $2,470,000 was eliminated. A reconciliation of
the provision (benefit) for income taxes with the tax (benefit) computed by
applying the 35% federal statutory tax rate is as follows (in thousands):

<TABLE>
<CAPTION>
                                                       Fiscal Years Ended
                                                          September 30
                                                     -------------------------
                                                      1999     1998     1997
                                                     -------  -------  -------
     <S>                                             <C>      <C>      <C>
     Computed expected tax (benefit)................ $17,965  $ 8,297  $(1,675)
     State income taxes, net of federal benefit.....   1,273      227      --
     Research and development credit................    (832)  (1,082)     --
     Foreign operations.............................  (1,302)     280     (566)
     Valuation allowance on deferred tax asset......  (2,470)    (793)     680
     Tax exempt interest income.....................    (936)     --       --
     S-Corporation losses of Entrega................   2,940      863      --
     Other..........................................      86       60      124
                                                     -------  -------  -------
                                                     $16,724  $ 7,852  $(1,437)
                                                     =======  =======  =======
</TABLE>

  At September 30, 1999, foreign earnings of $40,382,000 have been retained
indefinitely by subsidiary companies for reinvestment, on which no additional
U.S. tax has been provided. If repatriated, additional taxes of approximately
$13,766,000 on these earnings, net of available foreign tax credit
carryforwards, would be due. The Company has tax holiday status on its
operations in Malaysia, which expires in 2000. Income before income taxes for
all foreign operations was $23,837,000, $17,337,000 and $12,282,000 for fiscal
1999, 1998 and 1997, respectively.

NOTE EIGHT: COMMON STOCK AND RELATED PLANS

  The Company's Stock Option Plan (1992 Plan), as amended, authorizes a total
of up to 7,500,000 shares of Common Stock for issuance as either incentive
stock options with exercise prices which may not be less than fair market value
at the date of grant, or nonqualified stock options. The options generally vest
over three to four years and have terms of five to seven years.

  The 1992 Director Stock Option Plan (Director Plan) provides for the grant of
nonqualified options for a total of up to 725,000 shares of Common Stock to
non-employee members of the Board of Directors. The options are granted at fair
market value as of the date of grant and vest over a four-year period.

  The 1995 Stock Option Plan authorizes a total of up to 2,249,857 shares of
Common Stock for issuance as nonqualified stock options with vesting rights
similar to the 1992 Plan.

  The Patent Award Stock Option Plan authorizes a total of up to 250,000 shares
of Common Stock for issuance as nonqualified stock options with vesting periods
similar to the 1992 Plan.

  The Entrega Technologies, Inc. Stock Option Plan, as amended, authorizes a
total of up to 76,914 shares of Common Stock for issuance as either incentive
stock options with exercise prices which may not be less than fair market value
at the date of grant, or nonqualified stock options. The options generally vest
over four years, or became fully vested and exercisable upon change in control
on October 1, 1999. The options have terms of five to ten years.

                                      F-13
<PAGE>


                               XIRCOM, INC.

   NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

  As of September 30, 1999, the Company had 1,229,090 shares of common stock
available for future grant under its stock option plans. Information regarding
stock options outstanding as of September 30, 1999 is as follows:

<TABLE>
<CAPTION>
                                                                    Options
                                     Options Outstanding          Exercisable
                               ------------------------------- -----------------
                                                    Weighted-
                                                     Average
                                         Weighted-  Remaining          Weighted-
                                          Average  Contractual          Average
                                         Exercise     Life             Exercise
                                Shares     Price     (Years)   Shares    Price
                               --------- --------- ----------- ------- ---------
<S>                            <C>       <C>       <C>         <C>     <C>
Under $14.00.................. 1,615,324  $11.18      4.69     672,267  $10.87
$14.00-$25.00................. 2,044,185  $18.88      6.01     166,437  $15.85
Over $25.00...................   877,553  $34.11      6.99       7,180  $27.08
</TABLE>

  As of September 30, 1999, 1998 and 1997, stock options to purchase 845,884,
1,002,368 and 568,030 shares were exercisable at weighted average exercise
prices of $11.99, $12.52 and $11.32, respectively.

  The following table is a summary of activity for the Company's stock option
plans:

<TABLE>
<CAPTION>
                                                          Option price per share
                                                          ----------------------
                                              Number of                Weighted-
                                                shares     Low   High   Average
                                              ----------  ----- ------ ---------
<S>                                           <C>         <C>   <C>    <C>
Outstanding at October 1, 1996...............  2,319,494  $1.29 $17.13  $11.04
  Granted....................................  1,428,900  $8.63 $29.00  $14.17
  Exercised..................................  ( 449,493) $1.29 $15.50  $ 9.01
  Canceled...................................  ( 593,777) $1.86 $29.00  $13.42
                                              ----------  ----- ------  ------
Outstanding at September 30, 1997............  2,705,124  $7.63 $27.75  $12.48
  Granted....................................  1,600,689  $5.83 $26.00  $12.06
  Exercised..................................  ( 256,044) $5.83 $20.25  $10.65
  Canceled...................................  ( 380,586) $8.63 $27.75  $12.42
                                              ----------  ----- ------  ------
Outstanding at September 30, 1998............  3,669,183  $5.83 $27.75  $12.42
  Granted....................................  2,445,008  $5.83 $46.94  $25.12
  Exercised.................................. (1,103,812) $5.83 $27.75  $12.28
  Canceled...................................  ( 473,317) $8.63 $35.31  $13.74
                                              ----------  ----- ------  ------
Outstanding at September 30, 1999............  4,537,062  $5.83 $46.94  $19.08
                                              ==========  ===== ======  ======
</TABLE>

  The Company's 1994 Employee Stock Purchase Plan (ESPP) allows employees to
purchase Common Stock of the Company, through payroll deductions, at 85% of the
market value of the shares at the beginning or end of the offering period,
whichever is lower. The plan provides for the grant of rights to employees to
purchase up to a total of 1,400,000 shares of common stock. As of September 30,
1999, 818,627 shares were available for issuance under this plan. Information
regarding shares issued under the plan is as follows:

<TABLE>
<CAPTION>
                                                                    Price per
                                                                      share
                                                      Number of   -------------
Fiscal Years Ended September 30                     shares issued  Low    High
- -------------------------------                     ------------- ------ ------
<S>                                                 <C>           <C>    <C>
1999...............................................    122,869    $14.66 $19.13
1998...............................................    160,036    $ 8.50 $ 8.61
1997...............................................    124,782    $ 7.86 $14.45
</TABLE>

                                      F-14
<PAGE>


                               XIRCOM, INC.

   NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

  Had the Company recognized employee stock option-related compensation expense
in accordance with SFAS 123 and used the Black-Scholes option valuation model
for determining the weighted average fair value of options granted after
September 30, 1995, its net income (loss) and earnings (loss) per share would
have been as follows (in thousands, except per share amounts):

<TABLE>
<CAPTION>
                                                       Fiscal Years Ended
                                                          September 30
                                                    --------------------------
                                                     1999     1998      1997
                                                    -------  -------  --------
     <S>                                            <C>      <C>      <C>
     Net income (loss)............................. $34,605  $15,854  $ (9,850)
     Pro forma stock compensation expense, net.....  (6,836)  (3,545)   (2,056)
                                                    -------  -------  --------
     Pro forma net income (loss)................... $27,769  $12,309  $(11,906)
                                                    =======  =======  ========
     Pro forma basic earnings (loss) per share..... $  1.15  $   .54  $   (.55)
                                                    =======  =======  ========
     Pro forma diluted earnings (loss) per share... $  1.11  $   .54  $   (.55)
                                                    =======  =======  ========
</TABLE>

  For purposes of pro forma disclosures, the estimated fair value of the
options is amortized over the options' vesting periods. The pro forma effect on
net income (loss) for fiscal 1999, 1998 and 1997 is not representative of the
pro forma effect on net income (loss) in future years because it does not take
into consideration pro forma compensation expense related to grants made prior
to fiscal 1996. Pro forma information in future years will reflect the
amortization of a larger number of stock options granted in succeeding years.

  The fair value of the options was estimated at the date of grant using a
Black-Scholes option pricing model with the following weighted-average
assumptions for 1999, 1998 and 1997: risk-free interest rates of 5.04%, 5.55%
and 6.10%, respectively; dividend yields of 0%; volatility factors of the
expected market price of the Company's common stock from .60 to .67; and
expected life of the options of 4 years. These assumptions resulted in
weighted-average fair values of $13.72, $6.63 and $7.30 for each stock option
granted in 1999, 1998 and 1997, respectively.

  The Black-Scholes option valuation model was developed for use in estimating
the fair value of traded options. The Company's employee stock options have
characteristics significantly different from those of traded options such as
vesting restrictions and extremely limited transferability. In addition, the
assumptions used in option valuation models (see above) are highly subjective,
particularly the expected stock price volatility of the underlying stock.
Because changes in these subjective input assumptions can materially affect the
fair value estimate, in management's opinion, the existing models do not
provide a reliable single measure of the fair value of its employee stock
options.

  Entrega has a plan under which stock appreciation rights have been granted to
certain of its employees or other associates. As of September 30, 1999, stock
appreciation rights based on 12,872 shares were outstanding at a weighted
average strike price of $10.88. The rights vest over a four-year period
following the date of grant and certain of the rights vested in full upon the
acquisition of Entrega by the Company. Compensation expense based upon the
vested portion of these rights amounted to $346,000 in 1999.

  On February 28, 1997, the Company sold to Intel Corporation 2,516,405 newly
issued shares of the Company's common stock (representing a 12.5 percent
interest at the date of issuance) and a warrant to purchase an additional
1,509,903 newly issued shares of the Company's common stock. In consideration,
the Company received net cash proceeds of $51,361,000. On February 18, 1999,
Intel exercised its warrant and, pursuant to the terms of the warrant
agreement, elected to receive 514,314 shares at no additional cost in lieu of
purchasing 1,509,903 shares at an exercise price of $27.01. Concurrent with the
warrant exercise, Xircom


                                      F-15
<PAGE>


                               XIRCOM, INC.

   NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

repurchased 514,314 shares of common stock held by Intel for a total price of
$19,775,000, or $38.45 per share. As of September 30, 1999, Intel owned
2,516,405 shares of the Company's common stock.

  During fiscal 1997, the Company purchased 150,000 shares of Common Stock from
a director of the Company, with substantially all of the proceeds contributed
by the director to the Company as capital.

  The Company maintains a defined contribution 401(k) plan under which its U.S.
employees are eligible to participate. Participants may make, within certain
limitations, voluntary contributions based upon a percentage of their
compensation. The Company makes matching contributions based on a participant's
contribution up to a specified maximum percentage of the participant's
contribution. Participants vest in the Company's contributions based on years
of service. Company contributions were $370,000, $261,000 and $174,000 for
fiscal 1999, 1998 and 1997, respectively. Entrega has similar defined
contribution 401(k) plan for its U.S. employees. Entrega made no company
contributions during the 1999 and 1998 fiscal years.

NOTE NINE: SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION

<TABLE>
<CAPTION>
                                                                  Fiscal Years
                                                                Ended September
                                                                       30
                                                                ----------------
                                                                 1999  1998 1997
                                                                ------ ---- ----
     <S>                                                        <C>    <C>  <C>
     Cash paid:
       Interest................................................ $  380 $ 74 $491
       Income taxes............................................ $7,535 $807 $ 82
</TABLE>

  Net cash used in 1997 in discontinued operating activities of $5,984,000 was
comprised of loss from discontinued operating activities of $6,501,000,
depreciation and amortization of $1,777,000, deferred income taxes of
$2,329,000 and change in net assets of discontinued operations of $1,069,000.
Cash flows from investing activities of discontinued operations of $501,000
were the result of purchases of equipment and improvements.

NOTE TEN: COMMITMENTS AND CONTINGENCIES

  The Company leases its facilities and certain equipment under operating
leases expiring on various dates through 2005. Rent expense was $1,693,000,
$1,665,000 and $1,512,000 for fiscal 1999, 1998 and 1997, respectively. As of
September 30, 1999, minimum future rental payments under all noncancelable
operating leases for facilities and equipment were as follows (in thousands):

<TABLE>
<CAPTION>
                                                                       Operating
     Fiscal Year Ended September 30                                     leases
     ------------------------------                                    ---------
     <S>                                                               <C>
     2000.............................................................  $ 2,763
     2001.............................................................    2,515
     2002.............................................................    2,140
     2003.............................................................    2,053
     2004.............................................................    2,100
     Thereafter.......................................................    3,294
                                                                        -------
                                                                        $14,865
                                                                        =======
</TABLE>

  Future minimum rentals to be received under noncancelable subleases as of
September 30, 1999 totaled $269,000.

                                      F-16
<PAGE>


                               XIRCOM, INC.

   NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

  Under certain license agreements (see Note One), the Company is required to
pay specified amounts of per unit royalties based on sales of certain of its
products. Some of these agreements also contain minimum quarterly and annual
volume requirements. Certain of these agreements expire on specific dates,
others continue in effect as long as the technology is incorporated into the
Company's products, and some can be terminated by either party after specified
notice periods. Royalties under these agreements amounted to $594,000,
$649,000, and $740,000 for fiscal 1999, 1998 and 1997, respectively.

  The Company is involved in certain claims and legal proceedings that arise in
the normal course of business. Management does not believe that the outcome of
any of these matters will have a material adverse effect on the Company's
consolidated financial position, results of operations or cash flows.

NOTE ELEVEN: SEGMENT AND GEOGRAPHIC INFORMATION

  The Company operates in two industry segments within its business of the
design, development, manufacture, marketing and support of mobile information
access products for notebook computers and handheld devices. For management
purposes, the Company is divided into two primary business segments: the "OEM"
business, which includes operations specific to the Company's domestic and
international original equipment manufacturer customers, and the "Branded"
business, which includes operations specific to the Company's domestic and
international distribution customers. The Company sells most of its products in
each of its segments. The OEM business has a vice president who reports
directly to the Senior Vice President of Worldwide Sales and Marketing ("SVP"),
and the Branded business has three vice presidents, each of whom report
directly to the SVP. The SVP reports directly to the Chief Executive Officer
("CEO"), who is the Chief Operating Decision Maker as defined by SFAS 131. The
measures of profitability reviewed by the CEO for these segments consist of net
sales, gross profit, and certain identifiable operating expenses. The majority
of the Company's operating expenses are not allocated to these segments, but
are treated as corporate expenses (unallocated). Fiscal year 1999, 1998 and
1997 revenues and expenses attributable to each business segment are presented
in the table below. In addition, there is no allocation, direct or indirect, of
assets and liabilities to these business segments. The Company had no inter-
segment sales during the periods presented.


                                      F-17
<PAGE>

                                  XIRCOM, INC.

      NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

<TABLE>
<CAPTION>
                                         Branded    OEM   Unallocated  Total
                                         -------- ------- ----------- --------
                                                    (in thousands)
<S>                                      <C>      <C>     <C>         <C>
Fiscal 1999
  Net sales............................. $350,379 $74,057  $    --    $424,436
  Cost of sales.........................  191,472  51,776       --     243,248
                                         -------- -------  --------   --------
    Gross profit........................  158,907  22,281       --     181,188
  Research and development expenses.....      --      --     24,557     24,557
  Sales and marketing expenses..........   72,720   3,863    10,765     87,348
  General and administrative expenses...      --      --     15,143     15,143
  In-process research and development
   and other nonrecurring charges.......      --      --      4,596      4,596
                                         -------- -------  --------   --------
    Total operating expenses............   72,720   3,863    55,061    131,644
                                         -------- -------  --------   --------
  Operating income (loss)...............   86,187  18,418   (55,061)    49,544
  Other income, net.....................      --      --      1,785      1,785
                                         -------- -------  --------   --------
  Income (loss) from continuing
   operations before income taxes....... $ 86,187 $18,418  $(53,276)  $ 51,329
                                         ======== =======  ========   ========
Fiscal 1998
  Net sales............................. $222,352 $54,595  $    --    $276,947
  Cost of sales.........................  133,791  45,586       --     179,377
                                         -------- -------  --------   --------
    Gross profit........................   88,561   9,009       --      97,570
  Research and development expenses.....      --      --     16,599     16,599
  Sales and marketing expenses..........   41,076   2,365     7,258     50,699
  General and administrative expenses...      --      --     10,757     10,757
                                         -------- -------  --------   --------
    Total operating expenses............   41,076   2,365    34,614     78,055
                                         -------- -------  --------   --------
  Operating income (loss)...............   47,485   6,644   (34,614)    19,515
  Other income, net.....................      --      --      4,191      4,191
                                         -------- -------  --------   --------
  Income (loss) from continuing
   operations before income taxes....... $ 47,485 $ 6,644  $(30,423)  $ 23,706
                                         ======== =======  ========   ========
Fiscal 1997
  Net sales............................. $167,212 $17,363  $    --    $184,575
  Cost of sales.........................  112,219  14,081       --     126,300
                                         -------- -------  --------   --------
    Gross profit........................   54,993   3,282       --      58,275
  Research and development expenses.....      --      --     12,799     12,799
  Sales and marketing expenses..........   39,170     220     3,622     43,012
  General and administrative expenses...      --      --      8,259      8,259
  In-process research and development...      --      --      2,163      2,163
                                         -------- -------  --------   --------
    Total operating expenses............   39,170     220    26,843     66,233
                                         -------- -------  --------   --------
  Operating income (loss)...............   15,823   3,062   (26,843)    (7,958)
  Other income, net.....................      --      --      3,172      3,172
                                         -------- -------  --------   --------
  Income (loss) from continuing
   operations before income taxes....... $ 15,823 $ 3,062  $(23,671)  $ (4,786)
                                         ======== =======  ========   ========
</TABLE>

                                      F-18
<PAGE>


                               XIRCOM, INC.

   NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

  Two customers accounted for 20% and 10%, respectively, of net sales for
fiscal 1999. In 1998 and 1997, a single customer accounted for 13% and 17%,
respectively, of net sales. All such customers were in the branded business.
Net sales to Intel were 2.0%, 2.6%, and 5.3% of total net sales for fiscal
1999, 1998 and 1997, respectively. Accounts receivable from Intel were 2.3% and
4.4% of total accounts receivable as of September 30, 1999 and 1998,
respectively. Net sales are attributed to the following locations and were
derived from the location of the Company's regional operating unit having
invoiced the sale.

<TABLE>
<CAPTION>
                                                          Fiscal Years Ended
                                                             September 30
                                                      --------------------------
                                                        1999     1998     1997
                                                      -------- -------- --------
                                                            (in thousands)
     <S>                                              <C>      <C>      <C>
     United States................................... $213,490 $144,912 $ 98,677
     Belgium.........................................  151,811   90,017   53,941
     Singapore.......................................   57,032   42,018   31,957
     Other...........................................    2,103      --       --
                                                      -------- -------- --------
                                                      $424,436 $276,947 $184,575
                                                      ======== ======== ========
</TABLE>

  Net sales from the Company's products as a percentage of total net sales were
as follows:

<TABLE>
<CAPTION>
                                                                   Fiscal Years
                                                                      Ended
                                                                   September 30
                                                                  --------------
                                                                  1999 1998 1997
                                                                  ---- ---- ----
                                                                  (percentage of
                                                                  total revenue)
     <S>                                                          <C>  <C>  <C>
     LAN Adapters................................................ 28%   30%  42%
     LAN+Modem................................................... 57%   48%  43%
     Modem....................................................... 10%   21%  11%
     Port expansion system products..............................  4%  -- % -- %
     Other.......................................................  1%    1%   4%
</TABLE>

  Long-lived assets were located in the following countries:

<TABLE>
<CAPTION>
                                                             September 30
                                                        -----------------------
                                                         1999    1998    1997
                                                        ------- ------- -------
                                                            (in thousands)
     <S>                                                <C>     <C>     <C>
     United States..................................... $15,361 $ 8,261 $ 9,018
     Malaysia..........................................  22,297  17,784   7,514
     Other foreign countries...........................   2,878   1,238   1,287
                                                        ------- ------- -------
                                                        $40,536 $27,283 $17,819
                                                        ======= ======= =======
</TABLE>

                                      F-19
<PAGE>


                               XIRCOM, INC.

   NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

NOTE TWELVE: SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

<TABLE>
<CAPTION>
                                           Quarter ended
                           -------------------------------------------------
                           Dec. 31 Mar. 31  June 30  Sept. 30    Fiscal Year
                           ------- -------- -------- --------    -----------
                               (in thousands, except per share data)
<S>                        <C>     <C>      <C>      <C>         <C>
Fiscal 1999
  Net sales............... $98,498 $101,872 $108,439 $115,627     $424,436
  Gross profit............  39,434   43,229   46,805   51,720      181,188
  Net income..............   7,609    9,461    9,864    7,671(1)    34,605
  Diluted earnings per
   share.................. $   .30 $    .37 $    .39 $    .29(1)  $   1.35
Fiscal 1998
  Net sales............... $52,545 $ 64,134 $ 71,312 $ 88,956     $276,947
  Gross profit............  18,128   21,588   24,194   33,660       97,570
  Net income..............   2,430    3,002    3,763    6,659       15,854
  Diluted earnings per
   share.................. $   .11 $    .13 $    .16 $    .27     $    .68
</TABLE>
- --------

(1) In the fourth quarter of fiscal 1999, net income includes $3,309,000 or
    $0.13 per share for the write-off of in-process research and development
    and other non-recurring charges for future operating lease payments related
    to facilities to be vacated.

NOTE THIRTEEN: ACQUISITIONS

  On September 27, 1999, the Company purchased the Rex product line from
Franklin Electronic Publishers Incorporated, a developer and marketer of
handheld electronic reference products. The acquisition was accounted for as a
purchase with the results of operations included in the Company's financial
statements from the date of acquisition. Pro forma results for fiscal 1999 and
1998, assuming the acquisition occurred on October 1, 1997, would not be
materially different from the results reported. Cash paid for the acquisition
was $13,250,000, comprised of fair value of assets acquired of $15,618,000 less
liabilities assumed of $2,368,000. Of the assets acquired, $2,232,000
($1,607,000, net of tax benefit) was written off as in-process research and
development, and $10,291,000 was recorded as goodwill and other intangible
assets and classified as Other assets in the accompanying Supplemental
Consolidated Balance Sheets. Amortization of intangibles is provided using the
straight-line method over five years.

  In fiscal 1997, the Company purchased certain assets from Angia
Communications, Inc., a developer and manufacturer of PC Card products. Cash
paid for the acquisition in 1997 was $1,463,000 and was comprised of fair value
of assets acquired of $2,463,000 net of liabilities assumed of $1,000,000. In
connection with the purchase, the Company recorded a charge to operations of
$2,163,000 ($1,514,000, net of tax benefit) for the write-off of in-process
research and development.

  The amounts allocated to in-process research and development were based on
established valuation techniques in the high technology industry. At the date
of each acquisition mentioned above, the projects associated with the in-
process efforts had not yet reached technological feasibility and the research
and development in process had no alternative future uses. Accordingly, these
amounts were expensed on the respective dates of each acquisition.

NOTE FOURTEEN: SUBSEQUENT EVENTS

 Acquisition of Entrega Technologies, Inc.

  On October 1, 1999, the Company completed its acquisition of Entrega.
Incorporated in January 1998, Entrega designs and manufactures a selection of
standardized devices for connecting peripherals to personal


                                      F-20
<PAGE>


                               XIRCOM, INC.

   NOTES TO SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

computers, including Universal Serial Bus hubs, port converters and cables that
complement the Company's own product offerings. The acquisition will be
accounted for as a pooling-of-interests. The Company issued 266,195 shares of
its common stock in exchange for all of the outstanding shares of Entrega, and
assumed and exchanged all options to purchase Entrega stock for options to
purchase an aggregate of 76,914 shares of the Company's common stock. The
Company also issued 142,397 shares of its common stock to repay certain
indebtedness of Entrega. There were no intercompany transactions between the
two companies.

  Separate financial information of the combined entities for fiscal 1999 and
1998 were as follows:

<TABLE>
<CAPTION>
                                                      Xircom  Entrega  Combined
                                                     -------- -------  --------
                                                          (in thousands)
<S>                                                  <C>      <C>      <C>
Fiscal 1999
  Net sales......................................... $408,890 $15,546  $424,436
  Operating income (loss)...........................   57,396  (7,852)   49,544
  Net income (loss).................................   43,004  (8,399)   34,605
  Total assets......................................  269,318   6,178   275,496
  Total liabilities................................. $ 85,179 $15,397  $100,576
Fiscal 1998
  Net sales......................................... $276,056 $   891  $276,947
  Operating income (loss)...........................   21,923  (2,408)   19,515
  Net income (loss).................................   18,321  (2,467)   15,854
  Total assets......................................  195,224   2,711   197,935
  Total liabilities................................. $ 58,506 $ 4,678  $ 63,184
</TABLE>

  Separate diluted earnings per share for Xircom were $1.69 and $0.78 for
fiscal 1999 and 1998, respectively.

 Registration Statement

  On November 5, 1999, the Company announced its intention to file a
registration statement with the Securities and Exchange Commission for an
underwritten public offering of approximately 3,500,000 shares of Common Stock.
In the announcement, the Company indicated that it planned to file the
registration statement during November 1999.

                                      F-21
<PAGE>



                         [LOGO OF XIRCOM APPEARS HERE]


<PAGE>

                                    PART II

                   INFORMATION NOT REQUIRED IN THE PROSPECTUS

ITEM 14. Other Expenses of Issuance and Distribution

  The aggregate estimated (other than the registration fee) expenses to be paid
by the Registrant in connection with this offering are as follows:

<TABLE>
     <S>                                                               <C>
     Securities and Exchange Commission registration fee.............. $ 60,213
     NASD filing fee..................................................   22,160
     Fee for NASDAQ additional listing fee............................   17,500
     Accounting fees and expenses.....................................  100,000
     Legal fees and expenses..........................................  125,000
     Printing and engraving fees......................................  125,000
     Blue sky fees and expenses.......................................   10,000
     Transfer agent fees and expenses.................................   10,000
     Miscellaneous....................................................   80,127
                                                                       --------
       Total.......................................................... $550,000
                                                                       ========
</TABLE>

ITEM 15. Indemnification of Directors and Officers of Xircom

  Articles of Incorporation

  Article IV of our Amended and Restated Articles of Incorporation provides
that liability of the directors for monetary damages shall be eliminated to the
fullest extent permitted by California law and that we are authorized to
provide indemnification of directors, officers and other agents to the fullest
extent permissible under California law. California law provides that directors
of a corporation will not be personally liable for monetary damages for breach
of their fiduciary duties as directors, except for liability:

  . for acts or omissions that involve intentional misconduct or a knowing
    and culpable violation of law,

  . for acts or omissions that a director believes to be contrary to the best
    interests of the corporation or its shareholders or that involve the
    absence of good faith on the part of the director,

  . for any transaction from which the director derived an improper personal
    benefit,

  . for acts or omissions that show a reckless disregard for the director's
    duty to the corporation or its shareholders in circumstances in which the
    director was aware, or should have been aware, in the ordinary course of
    performing a director's duties, of a risk of serious injury to the
    corporation or its shareholders,

  . for acts or omissions that constitute an unexcused pattern of inattention
    that amounts to an abdication of the director's duty to the corporation
    or its shareholders,

  . for transactions between the corporation and one or more of its directors
    or between the corporation and any corporation in which one or more of
    its directors has a material financial interest, or

  . for approving certain corporate actions including distributions to
    shareholders or committing the corporation to certain loans or guaranty
    as provided in Section 316 of the California General Corporation Law.

  Bylaws

  Article IV of our Bylaws provides that we will, to the maximum extent
permitted by the California General Corporation Law, have power to indemnify
any person who is or was a director, officer, employee or other agent of the
corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise, or who was a director, officer, employee or
agent of the corporation which was a predecessor corporation of the corporation

                                      II-1
<PAGE>

or of another enterprise at the request of such predecessor corporation against
expenses, judgments, fines, settlements and other amounts actually and
reasonably incurred in connection with any proceeding arising by reason of the
fact any such person is or was an agent of the corporation.

  Our Bylaws also permit us to secure insurance on behalf of any officer,
director, employee or other agent for any liability arising out of his or her
actions in such capacity, regardless of whether the corporation would have the
power to indemnify the agent against such liability. We currently maintain
liability insurance for our officers and directors.

  We have entered into agreements to indemnify our directors and officers, in
addition to the indemnification provided for in our Articles of Incorporation
and Bylaws. These agreements, among other things, indemnify our directors and
officers for certain expenses, including attorney's fees, judgments, fines and
settlement amounts incurred by any such person in any action or proceeding,
including any action by or in the right of Xircom, arising out of such person's
services as a director or officer of Xircom, any subsidiary of Xircom or any
other company or enterprise to which the person provides services at the
request of Xircom.

  The form of proposed Underwriting Agreement to be filed as an Exhibit hereto
includes provisions regarding the indemnification of our officers and directors
against certain liabilities by the several Underwriters.

ITEM 16. Exhibits

  The following exhibits are filed herewith or incorporated by reference
herein:

<TABLE>
<CAPTION>
 Exhibit
 Number                              Exhibit Title
 -------                             -------------
 <C>     <S>
  1.1    Form of Underwriting Agreement
  3.1++  Amended Articles of Incorporation of Xircom, Inc. (incorporated by
         reference to Exhibit 3.1 of the Company's report on Form 10-Q for the
         quarter ended March 31, 1992)
  3.2++  Bylaws of Xircom, Inc. (incorporated by reference to Exhibit 3.3 of
         Amendment No. 3 to the Company's registration statement on Form S-1,
         No. 33-45667)
  5.1*   Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation
 23.1    Consent of Ernst & Young LLP, Independent Auditors
 23.2*   Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation
         (included in Exhibit 5.1)
 24.1++  Power of Attorney of certain directors and officers of Xircom, Inc.
         (see page II-4)
</TABLE>
- --------
*To be filed by amendment.
++Previously filed.

                                      II-2
<PAGE>

ITEM 17. Undertakings

  The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 that is incorporated by reference in this
Registration Statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

  Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the provisions described under Item 15 above, or
otherwise, the Registrant has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public
policy as expressed in the Securities Act and is, therefore, unenforceable. In
the event that a claim for indemnification against such liabilities, other than
the payment by the Registrant of expenses incurred or paid by a director,
officer or controlling person of the Registrant in the successful defense of
any action, suit or proceeding, is asserted by such director, officer or
controlling person in connection with the securities being registered, the
Registrant will, unless in the opinion of its counsel the matter has been
settled by controlling precedent, submit to a court of appropriate jurisdiction
the question whether such indemnification by it is against public policy as
expressed in the Securities Act and will be governed by the final adjudication
of such issue.

  The undersigned Registrant hereby undertakes that:

    (1) For purposes of determining any liability under the Securities Act,
  the information omitted from the form of prospectus filed as part of this
  registration statement in reliance upon Rule 430A and contained in a form
  of prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or
  497(h) under the Securities Act shall be deemed to be part of this
  registration statement as of the time it was declared effective.

    (2) For the purpose of determining any liability under the Securities
  Act, each post-effective amendment that contains a form of prospectus shall
  be deemed to be a new registration statement relating to the securities
  offered therein, and the offering of such securities at that time shall be
  deemed to be the initial bona fide offering thereof.

                                      II-3
<PAGE>

                                   SIGNATURES

  Pursuant to the requirements of the Securities Act, the Registrant certifies
that it has reasonable grounds to believe that it meets all of the requirements
for filing on Form S-3 and has duly caused this Amendment No. 1 to the
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Thousand Oaks, State of California, on November
19, 1999.

                                          XIRCOM, INC.

                                                   /s/ Dirk I. Gates
                                          By: _________________________________
                                                  Chairman of the Board
                                              President and Chief Executive
                                                         Officer


  Pursuant to the requirements of the Securities Act, this Amendment No.1 to
the Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
                 Name                          Title                  Date
                 ----                          -----                  ----

 <C>                                  <S>                       <C>
         /s/ Dirk I. Gates            President and Chief       November 19, 1999
 ____________________________________  Executive Officer
            Dirk I. Gates

                  *                   Chief Financial Officer   November 19, 1999
 ____________________________________  (Principal Financial
         Steven F. DeGennaro           and Accounting
                                       Officer)

                  *                   Director                  November 19, 1999
 ____________________________________
         Michael F. G. Ashby

                  *                   Director                  November 19, 1999
 ____________________________________
           Kenneth J. Biba

                  *                   Director                  November 19, 1999
 ____________________________________
            Gary J. Bowen
                  *                   Director                  November 19, 1999
 ____________________________________
           J. Kirk Mathews

                  *                   Director                  November 19, 1999
 ____________________________________
            Carl E. Russo

                  *                   Director                  November 19, 1999
 ____________________________________
         William J. Schroeder

                  *                   Director                  November 19, 1999
 ____________________________________
           Delbert W. Yocam

         /s/ Dirk I. Gates
 *By: ______________________________
           Attorney-in-Fact

</TABLE>

                                      II-4
<PAGE>

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
 Exhibit
 Number                              Exhibit Title
 -------                             -------------
 <C>     <S>
  1.1    Form of Underwriting Agreement
  3.1++  Amended Articles of Incorporation of Xircom, Inc. (incorporated by
         reference to Exhibit 3.1 of the Company's report on Form 10-Q for the
         quarter ended March 31, 1992)
  3.2++  Bylaws of Xircom, Inc. (incorporated by reference to Exhibit 3.3 of
         Amendment No. 3 to the Company's registration statement on Form S-1,
         No. 33-45667)
  5.1*   Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation
 23.1    Consent of Ernst & Young LLP, Independent Auditors
 23.2*   Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation
         (included in Exhibit 5.1)
 24.1++  Power of Attorney of certain directors and officers of Xircom, Inc.
         (see page II-4)
</TABLE>
- --------
*To be filed by amendment.
++Previously filed.

<PAGE>

                              3,500,000 Shares

                                XIRCOM, INC.

                                Common Stock
                        ($0.001 par value per share)


                           UNDERWRITING AGREEMENT
                           ----------------------


                                                            December __, 1999


Credit Suisse First Boston Corporation
CIBC World Markets Corp.
SG Cowen Securities Corporation
As Representatives of the Several Underwriters,
 c/o Credit Suisse First Boston Corporation,
       Eleven Madison Avenue,
        New York, N.Y. 10010-3629

Ladies and Gentlemen:


  1.  Introductory.  Xircom, Inc., a California corporation ("Company"),
proposes to issue and sell 3,500,000 shares ("Firm Securities") of its Common
Stock, par value $0.001 per share ("Securities"), and also proposes to issue and
sell to the Underwriters, at the option of the Underwriters, an aggregate of not
more than 525,000 additional shares ("Optional Securities") of its Securities as
set forth below. The Firm Securities and the Optional Securities are herein
collectively called the "Offered Securities".  The Company hereby agrees with
the several Underwriters named in Schedule A hereto ("Underwriters") as follows:

  2.  Representations and Warranties of the Company.  The Company represents and
warrants to, and agrees with, the several Underwriters that:

       (a)  A registration statement (No. 333-90783) relating to the Offered
     Securities, including a form of prospectus, has been filed with the
     Securities and Exchange Commission ("Commission") and either (i) has been
     declared effective under the Securities Act of 1933, as amended ("Act"),
     and is not proposed to be amended or (ii) is proposed to be amended by
     amendment or post-effective amendment. If such registration statement
     ("initial registration statement") has been declared effective, either (i)
     an additional registration statement ("additional registration statement")
     relating to the Offered Securities may have been filed with the Commission
     pursuant to Rule 462(b) ("Rule 462(b)") under the Act and, if so filed, has
     become effective upon filing pursuant to such Rule and the Offered
     Securities all have been duly registered under the Act pursuant to the

                                       1
<PAGE>

     initial registration statement and, if applicable, the additional
     registration statement or (ii) such an additional registration statement is
     proposed to be filed with the Commission pursuant to Rule 462(b) and will
     become effective upon filing pursuant to such Rule and upon such filing the
     Offered Securities will all have been duly registered under the Act
     pursuant to the initial registration statement and such additional
     registration statement.  If the Company does not propose to amend the
     initial registration statement or if an additional registration statement
     has been filed and the Company does not propose to amend it, and if any
     post-effective amendment to either such registration statement has been
     filed with the Commission prior to the execution and delivery of this
     Agreement, the most recent amendment (if any) to each such registration
     statement has been declared effective by the Commission or has become
     effective upon filing pursuant to Rule 462(c) ("Rule 462(c)") under the Act
     or, in the case of the additional registration statement, Rule 462(b). For
     purposes of this Agreement, "Effective Time" with respect to the initial
     registration statement or, if filed prior to the execution and delivery of
     this Agreement, the additional registration statement means (i) if the
     Company has advised the Representatives that it does not propose to amend
     such registration statement, the date and time as of which such
     registration statement, or the most recent post-effective amendment thereto
     (if any) filed prior to the execution and delivery of this Agreement, was
     declared effective by the Commission or has become effective upon filing
     pursuant to Rule 462(c), or (ii) if the Company has advised the
     Representatives that it proposes to file an amendment or post-effective
     amendment to such registration statement, the date and time as of which
     such registration statement, as amended by such amendment or post-effective
     amendment, as the case may be, is declared effective by the Commission. If
     an additional registration statement has not been filed prior to the
     execution and delivery of this Agreement but the Company has advised the
     Representatives that it proposes to file one, "Effective Time" with respect
     to such additional registration statement means the date and time as of
     which such registration statement is filed and becomes effective pursuant
     to Rule 462(b). "Effective Date" with respect to the initial registration
     statement or the additional registration statement (if any) means the date
     of the Effective Time thereof. The initial registration statement, as
     amended at its Effective Time, including all material incorporated by
     reference therein, including all information contained in the additional
     registration statement (if any) and deemed to be a part of the initial
     registration statement as of the Effective Time of the additional
     registration statement pursuant to the General Instructions of the Form on
     which it is filed and including all information (if any) deemed to be a
     part of the initial registration statement as of its Effective Time
     pursuant to Rule 430A(b) ("Rule 430A(b)") under the Act, is hereinafter
     referred to as the "Initial Registration Statement". The additional
     registration statement, as amended at its Effective Time, including the
     contents of the initial registration statement incorporated by reference
     therein and including all information (if any) deemed to be a part of the
     additional registration statement as of its Effective Time pursuant to Rule
     430A(b), is hereinafter referred to as the "Additional Registration
     Statement".  The Initial Registration Statement and the Additional
     Registration Statement are herein referred to collectively as the
     "Registration Statements" and individually as a "Registration Statement".
     The form of prospectus relating to the Offered Securities, as first filed
     with the Commission pursuant to and in accordance with Rule 424(b) ("Rule
     424(b)") under the Act or (if no such filing is required) as included in a
     Registration Statement, including all material incorporated by reference in
     such prospectus, is hereinafter referred to as the "Prospectus". No
     document has been or will be prepared or distributed in reliance on Rule
     434 under the Act.  All references in this Agreement to financial
     statements and schedules and other information which is "contained,"
     "included" or "stated" in the Registration Statements, any preliminary
     prospectus or the Prospectus (or other references of like import) shall be
     deemed to mean and include all such financial statements and schedules and
     other information which is incorporated by reference in the Registration
     Statements, any preliminary prospectus or the Prospectus, as the case may
     be; and all references in this Agreement to amendments or supplements to
     the Registration Statements, any preliminary prospectus or the Prospectus
     shall be deemed to mean and include the filing of any document under the
     Securities Exchange Act of 1934 (the "Exchange Act") which is incorporated
     by reference in the Registration Statements, such preliminary prospectus or
     the Prospectus, as the case may be.

       (b)  If the Effective Time of the Initial Registration Statement is prior
     to the execution and delivery of this Agreement: (i) on the Effective Date
     of the Initial Registration Statement, the

                                       2
<PAGE>

     Initial Registration Statement conformed in all respects to the
     requirements of the Act and the rules and regulations of the Commission
     ("Rules and Regulations") and did not include any untrue statement of a
     material fact or omit to state any material fact required to be stated
     therein or necessary to make the statements therein not misleading, (ii)
     on the Effective Date of the Additional Registration Statement (if any),
     each Registration Statement conformed, or will conform, in all material
     respects to the requirements of the Act and the Rules and Regulations and
     did not include, or will not include, any untrue statement of a material
     fact and did not omit, or will not omit, to state any material fact
     required to be stated therein or necessary to make the statements therein
     not misleading and (iii) on the date of this Agreement, the Initial
     Registration Statement and, if the Effective Time of the Additional
     Registration Statement is prior to the execution and delivery of this
     Agreement, the Additional Registration Statement each conforms, and at
     the time of filing of the Prospectus pursuant to Rule 424(b) or (if no
     such filing is required) at the Effective Date of the Additional
     Registration Statement in which the Prospectus is included, each
     Registration Statement and the Prospectus will conform, in all material
     respects to the requirements of the Act and the Rules and Regulations,
     and neither of such documents includes, or will include, any untrue
     statement of a material fact or omits, or will omit, to state any
     material fact required to be stated therein or necessary to make the
     statements therein not misleading (with respect to the Prospectus only,
     in the light of the circumstances under which they were made). If the
     Effective Time of the Initial Registration Statement is subsequent to the
     execution and delivery of this Agreement: on the Effective Date of the
     Initial Registration Statement, the Initial Registration Statement and
     the Prospectus will conform in all material respects to the requirements
     of the Act and the Rules and Regulations, neither of such documents will
     include any untrue statement of a material fact or will omit to state any
     material fact required to be stated therein or necessary to make the
     statements therein not misleading (with respect to the Prospectus only,
     in the light of the circumstances under which they were made), and no
     Additional Registration Statement has been or will be filed. The two
     preceding sentences do not apply to statements in or omissions from a
     Registration Statement or the Prospectus based upon written information
     furnished to the Company by any Underwriter through the Representatives
     specifically for use therein, it being understood and agreed that the
     only such information is that described as such in Section 7(b) hereof.

       (c)  The Company has been duly incorporated and is an existing
     corporation in good standing under the laws of the State of California,
     with power and authority (corporate and other) to own its properties and
     conduct its business as described in the Prospectus; and the Company is
     duly qualified to do business as a foreign corporation in good standing in
     all other jurisdictions in which its ownership or lease of property or the
     conduct of its business requires such qualification, except where the
     failure to be so qualified would individually or in the aggregate not have
     a material adverse effect on the condition (financial or otherwise),
     business, properties or results of operations of the Company and its
     subsidiaries taken as a whole ("Material Adverse Effect").

       (d)  Each subsidiary of the Company has been duly incorporated and is an
     existing corporation in good standing under the laws of the jurisdiction of
     its incorporation, with power and authority (corporate and other) to own
     its properties and conduct its business as described in the Prospectus; and
     each subsidiary of the Company is duly qualified to do business as a
     foreign corporation in good standing in all other jurisdictions in which
     its ownership or lease of property or the conduct of its business requires
     such qualification, except where the failure to be so qualified would
     individually or in the aggregate not have a Material Adverse Effect; all of
     the issued and outstanding capital stock of each subsidiary of the Company
     has been duly authorized and validly issued and is fully paid and
     nonassessable; and the capital stock of each subsidiary owned by the
     Company, directly or through subsidiaries, is owned free from liens,
     encumbrances and defects.

                                       3
<PAGE>

       (e)  The Offered Securities and all other outstanding shares of capital
     stock of the Company have been duly authorized; all outstanding shares of
     capital stock of the Company are, and, when the Offered Securities have
     been delivered and paid for in accordance with this Agreement on each
     Closing Date (as defined below), such Offered Securities will have been,
     validly issued, fully paid and nonassessable and will conform to the
     description thereof contained in the Prospectus; and the stockholders of
     the Company have no preemptive rights with respect to the Securities except
     as have been validly waived.

       (f)  Except as disclosed in the Prospectus, there are no contracts,
     agreements or understandings between the Company and any person that would
     give rise to a valid claim against the Company or any Underwriter for a
     brokerage commission, finder's fee or other like payment in connection with
     this offering.

       (g)  There are no contracts, agreements or understandings between the
     Company and any person granting such person the right to require the
     Company to file a registration statement under the Act with respect to any
     securities of the Company owned or to be owned by such person or to require
     the Company to include such securities in the securities registered
     pursuant to a Registration Statement or in any securities being registered
     pursuant to any other registration statement filed by the Company under the
     Act which have not been validly waived with respect to this offering of the
     Offered Securities.

       (h)  The Offered Securities have been approved for listing on The Nasdaq
     Stock Market's National Market subject to notice of issuance.

       (i)  No consent, approval, authorization, or order of, or filing with,
     any governmental agency or body or any court is required for the
     consummation of the transactions contemplated by this Agreement in
     connection with the issuance and sale of the Offered Securities by the
     Company, except such as have been obtained and made under the Act and
     such as may be required under state securities laws.

       (j)  The execution, delivery and performance of this Agreement, and the
     issuance and sale of the Offered Securities will not result in a breach or
     violation of any of the terms and provisions of, or constitute a default
     under, any statute, any rule, regulation or order of any governmental
     agency or body or any court, domestic or foreign, having jurisdiction over
     the Company or any subsidiary of the Company or any of their properties, or
     any agreement or instrument to which the Company or any such subsidiary is
     a party or by which the Company or any such subsidiary is bound or to which
     any of the properties of the Company or any such subsidiary is subject, or
     the charter or by-laws of the Company or any such subsidiary, and the
     Company has full power and authority to authorize, issue and sell the
     Offered Securities as contemplated by this Agreement.

       (k)  This Agreement has been duly authorized, executed and delivered by
     the Company.

       (l)  Except as disclosed in the Prospectus, the Company and its
     subsidiaries have good and marketable title to all real properties and all
     other properties and assets owned by them, in each case free from liens,
     encumbrances and defects that would materially affect the value thereof or
     materially interfere with the use made or to be made thereof by them; and
     except as disclosed in the Prospectus, the Company and its subsidiaries
     hold any leased real or personal property under valid and enforceable
     leases with no exceptions that would materially interfere with the use made
     or to be made thereof by them.

       (m)  The Company and its subsidiaries possess adequate certificates,
     authorities or permits issued by appropriate governmental agencies or
     bodies necessary to conduct the business now operated by them and have not
     received any notice of proceedings relating to the revocation or

                                       4
<PAGE>

     modification of any such certificate, authority or permit that, if
     determined adversely to the Company or any of its subsidiaries, would
     individually or in the aggregate have a Material Adverse Effect.

       (n)  No labor dispute with the employees of the Company or any subsidiary
     exists or, to the knowledge of the Company, is imminent that might have a
     Material Adverse Effect.

       (o)  Except as disclosed in the Prospectus, the Company and its
     subsidiaries own, possess or can acquire on reasonable terms, adequate
     trademarks, trade names and other rights to inventions, know-how, patents,
     copyrights, confidential information and other intellectual property
     (collectively, "intellectual property rights") necessary to conduct the
     business now operated by them, or presently employed by them, and have not
     received any notice of infringement of or conflict with asserted rights of
     others with respect to any intellectual property rights that, if determined
     adversely to the Company or any of its subsidiaries, would individually or
     in the aggregate have a Material Adverse Effect.

       (p)  Except as disclosed in the Prospectus, neither the Company nor any
     of its subsidiaries is in violation of any statute, any rule, regulation,
     decision or order of any governmental agency or body or any court,
     domestic or foreign, relating to the use, disposal or release of
     hazardous or toxic substances or relating to the protection or
     restoration of the environment or human exposure to hazardous or toxic
     substances (collectively, "environmental laws"), owns or operates any
     real property contaminated with any substance that is subject to any
     environmental laws, is liable for any off-site disposal or contamination
     pursuant to any environmental laws, or is subject to any claim relating
     to any environmental laws, which violation, contamination, liability or
     claim would individually or in the aggregate have a Material Adverse
     Effect; and the Company is not aware of any pending investigation which
     might lead to such a claim.

       (q)  Except as disclosed in the Prospectus, there are no pending actions,
     suits or proceedings against or affecting the Company, any of its
     subsidiaries or any of their respective properties that, if determined
     adversely to the Company or any of its subsidiaries, would individually or
     in the aggregate have a Material Adverse Effect, or would materially and
     adversely affect the ability of the Company to perform its obligations
     under this Agreement, or which are otherwise material in the context of the
     sale of the Offered Securities; and no such actions, suits or proceedings
     are threatened or, to the Company's knowledge, contemplated.

       (r)  The financial statements included in each Registration Statement and
     the Prospectus present fairly the financial position of the Company and its
     consolidated subsidiaries as of the dates shown and their results of
     operations and cash flows for the periods shown, and such financial
     statements have been prepared in conformity with the generally accepted
     accounting principles in the United States applied on a consistent basis
     and the schedules included in each Registration Statement present fairly
     the information required to be stated therein.

       (s)  Except as disclosed in the Prospectus, since the date of the latest
     audited financial statements included in the Prospectus there has been no
     material adverse change, nor any development or event involving a
     prospective material adverse change, in the condition (financial or other),
     business, properties or results of operations of the Company and its
     subsidiaries taken as a whole, and, except as disclosed in or contemplated
     by the Prospectus, there has been no dividend or distribution of any kind
     declared, paid or made by the Company on any class of its capital stock.

       (t)  The Company is not and, after giving effect to the offering and sale
     of the Offered Securities and the application of the proceeds thereof as
     described in the Prospectus, will not be an "investment company" as defined
     in the Investment Company Act of 1940.

                                       5
<PAGE>

       (u)  Ernst & Young LLP, who have certified the financial statements of
     the Company and its subsidiaries, are independent public accountants as
     required by the Act and the Rules and Regulations.

       (v)  The Company has reviewed its operations and that of its subsidiaries
     and any third parties with which the Company or any of its subsidiaries has
     a material relationship to evaluate the extent to which the business or
     operations of the Company or any of its subsidiaries will be effected by
     the Year 2000 Problem.  As a result of such review, the Company has no
     reason to believe, and does not believe, that the Year 2000 Problem will
     have a Material Adverse Effect or result in any material loss or
     interference with the Company's business or operations.  The "Year 2000
     Problem" as used herein means any significant risk that computer hardware
     or software used in the receipt, transmission, processing, manipulation,
     storage, retrieval, retransmission or other utilization of date or in the
     operation of mechanical or electrical systems of any kind will not, in the
     case of dates or time periods occurring after December 31, 1999, function
     at least as effectively as in the case of dates or time periods occurring
     prior to January 1, 2000.

       (w)  The documents incorporated or deemed to be incorporated by reference
     in the Registration Statements and the Prospectus, at the time they were or
     hereafter are filed with the Commission, complied and will comply in all
     material respects with the requirements of the Exchange Act and the Rules
     and Regulations, and, when read together with the other information in the
     Prospectus, at the time the Registration Statements became effective, at
     the time the Prospectus was issued and at the First Closing Date (and if
     any Option Securities are purchased, at the Optional Closing Date), did not
     and will not contain an untrue statement of a material fact or omit to
     state a material fact required to be stated therein or necessary to make
     the statements therein not misleading (with respect to the Prospectus only,
     in the light of the circumstances under which they were made).

     3.  Purchase, Sale and Delivery of Offered Securities.  On the basis of the
representations, warranties and agreements herein contained, but subject to the
terms and conditions herein set forth, the Company agrees to sell to the
Underwriters, and the Underwriters agree, severally and not jointly, to purchase
from the Company, at a purchase price of $           per share, the respective
numbers of shares of Firm Securities set forth opposite the names of the
Underwriters in Schedule A hereto.

     The Company will deliver the Firm Securities to the Representatives for the
accounts of the Underwriters, against payment of the purchase price in Federal
(same day) funds by official bank check or checks or wire transfer to an account
at a bank acceptable to Credit Suisse First Boston Corporation ("CSFBC") drawn
to the order of                             at the office of                 ,
at 9:00 A.M., New York time, on                            , or at such other
time not later than seven full business days thereafter as CSFBC and the Company
determine, such time being herein referred to as the "First Closing Date". For
purposes of Rule 15c6-1 under the Exchange Act, the First Closing Date (if later
than the otherwise applicable settlement date) shall be the settlement date for
payment of funds and delivery of securities for all the Offered Securities sold
pursuant to the offering. The certificates for the Firm Securities so to be
delivered will be in definitive form, in such denominations and registered in
such names as CSFBC requests and will be made available for checking and
packaging at the office of                              at least 24 hours prior
to the First Closing Date.

     In addition, upon written notice from CSFBC given to the Company from time
to time not more than 30 days subsequent to the date of the Prospectus, the
Underwriters may purchase all or less than all of the Optional Securities at the
purchase price per Security to be paid for the Firm Securities. The Company
agrees to sell to the Underwriters the number of shares of Optional Securities
specified in such notice and the Underwriters agree, severally and not jointly,
to purchase such Optional Securities. Such Optional Securities shall be
purchased for the account of each Underwriter in the same proportion as the
number of

                                       6
<PAGE>

shares of Firm Securities set forth opposite such Underwriter's name bears to
the total number of shares of Firm Securities (subject to adjustment by CSFBC
to eliminate fractions) and may be purchased by the Underwriters only for the
purpose of covering over-allotments made in connection with the sale of the
Firm Securities. No Optional Securities shall be sold or delivered unless the
Firm Securities previously have been, or simultaneously are, sold and
delivered. The right to purchase the Optional Securities or any portion
thereof may be exercised from time to time and to the extent not previously
exercised may be surrendered and terminated at any time upon notice by CSFBC
to the Company.

     Each time for the delivery of and payment for the Optional Securities,
being herein referred to as an "Optional Closing Date", which may be the First
Closing Date (the First Closing Date and each Optional Closing Date, if any,
being sometimes referred to as a "Closing Date"), shall be determined by CSFBC
but shall be not later than five full business days after written notice of
election to purchase Optional Securities is given. The Company will deliver the
Optional Securities being purchased on each Optional Closing Date to the
Representatives for the accounts of the several Underwriters, against payment of
the purchase price therefor in Federal (same day) funds by official bank check
or checks or wire transfer to an account at a bank acceptable to CSFBC drawn to
the order of                      , at the office of                     .   The
certificates for the Optional Securities being purchased on each Optional
Closing Date will be in definitive form, in such denominations and registered in
such names as CSFBC requests upon reasonable notice prior to such Optional
Closing Date and will be made available for checking and packaging at the office
of                                          at a reasonable time in advance of
such Optional Closing Date.

     4.  Offering by Underwriters.  It is understood that the several
Underwriters propose to offer the Offered Securities for sale to the public as
set forth in the Prospectus.

     5.  Certain Agreements of the Company. The Company agrees with the several
Underwriters that:

       (a)  If the Effective Time of the Initial Registration Statement is prior
     to the execution and delivery of this Agreement, the Company will file the
     Prospectus with the Commission pursuant to and in accordance with
     subparagraph (1) (or, if applicable and if consented to by CSFBC,
     subparagraph (4)) of Rule 424(b) not later than the earlier of (A) the
     second business day following the execution and delivery of this Agreement
     or (B) the fifteenth business day after the Effective Date of the Initial
     Registration Statement.  The Company will advise CSFBC promptly of any such
     filing pursuant to Rule 424(b). If the Effective Time of the Initial
     Registration Statement is prior to the execution and delivery of this
     Agreement and an additional registration statement is necessary to register
     a portion of the Offered Securities under the Act but the Effective Time
     thereof has not occurred as of such execution and delivery, the Company
     will file the additional registration statement or, if filed, will file a
     post-effective amendment thereto with the Commission pursuant to and in
     accordance with Rule 462(b) on or prior to 10:00 P.M., New York time, on
     the date of this Agreement or, if earlier, on or prior to the time the
     Prospectus is printed and distributed to any Underwriter, or will make such
     filing at such later date as shall have been consented to by CSFBC.

       (b)  The Company will advise CSFBC promptly of any proposal to amend or
     supplement the initial or any additional registration statement as filed or
     the related prospectus or the Initial Registration Statement, the
     Additional Registration Statement (if any) or the Prospectus and will not
     effect such amendment or supplementation without CSFBC's consent; and the
     Company will also advise CSFBC promptly of the effectiveness of each
     Registration Statement (if its Effective Time is subsequent to the
     execution and delivery of this Agreement) and of any amendment or
     supplementation of a Registration Statement or the Prospectus and of the
     institution by the Commission of any stop order proceedings in respect of a
     Registration Statement and will use its best efforts to prevent the
     issuance of any such stop order and to obtain as soon as possible its
     lifting, if issued.

                                       7
<PAGE>

       (c)  If, at any time when a prospectus relating to the Offered Securities
     is required to be delivered under the Act in connection with sales by any
     Underwriter or dealer, any event occurs as a result of which the Prospectus
     as then amended or supplemented would include an untrue statement of a
     material fact or omit to state any material fact necessary to make the
     statements therein, in the light of the circumstances under which they were
     made, not misleading, or if it is necessary at any time to amend the
     Prospectus to comply with the Act, the Company will promptly notify CSFBC
     of such event and will promptly prepare and file with the Commission, at
     its own expense, an amendment or supplement which will correct such
     statement or omission or an amendment which will effect such compliance.
     Neither CSFBC's consent to, nor the Underwriters' delivery of, any such
     amendment or supplement shall constitute a waiver of any of the conditions
     set forth in Section 6.

       (d)  As soon as practicable, but not later than the Availability Date (as
     defined below), the Company will make generally available to its
     securityholders an earnings statement covering a period of at least 12
     months beginning after the Effective Date of the Initial Registration
     Statement (or, if later, the Effective Date of the Additional Registration
     Statement) which will satisfy the provisions of Section 11(a) of the Act.
     For the purpose of the preceding sentence, "Availability Date" means the
     45th day after the end of the fourth fiscal quarter following the fiscal
     quarter that includes such Effective Date, except that, if such fourth
     fiscal quarter is the last quarter of the Company's fiscal year,
     "Availability Date" means the 90th day after the end of such fourth fiscal
     quarter.

       (e)  The Company will furnish to the Representatives copies of each
     Registration Statement (___ of which will be signed and will include all
     exhibits and documents incorporated by reference therein), each related
     preliminary prospectus, and, so long as a prospectus relating to the
     Offered Securities is required to be delivered under the Act in connection
     with sales by any Underwriter or dealer, the Prospectus and all amendments
     and supplements to such documents, in each case in such quantities as CSFBC
     requests. The Prospectus shall be so furnished on or prior to 3:00 P.M.,
     New York time, on the business day following the later of the execution and
     delivery of this Agreement or the Effective Time of the Initial
     Registration Statement. All other documents shall be so furnished as soon
     as available. The Company will pay the expenses of printing and
     distributing to the Underwriters all such documents.

       (f)  The Company will arrange for the qualification of the Offered
     Securities for sale under the laws of such jurisdictions as CSFBC
     designates and will continue such qualifications in effect so long as
     required for the distribution.

       (g)  During the period of five years hereafter, the Company will make
     available to the Representatives and, upon request, to each of the other
     Underwriters, as soon as practicable after the end of each fiscal year, a
     copy of its annual report to stockholders for such year; and the Company
     will furnish to the Representatives (i) as soon as available, a copy of
     each report and any definitive proxy statement of the Company filed with
     the Commission under the Exchange Act or mailed to stockholders, and (ii)
     from time to time, such other information concerning the Company as CSFBC
     may reasonably request.

       (h)  The Company will pay all expenses incident to the performance of its
     obligations under this Agreement, for any filing fees and other expenses
     (including fees and disbursements of counsel) incurred in connection with
     qualification of the Offered Securities for sale and determination of their
     eligibility for investment under the laws of such jurisdictions as CSFBC
     designates and the printing of memoranda relating thereto, for the filing
     fee incident to, and the reasonable fees and disbursements of counsel to
     the Underwriters in connection with, the review by the National Association
     of Securities Dealers, Inc. of the Offered Securities, for any travel

                                       8
<PAGE>

     expenses of the Company's officers and employees and any other expenses of
     the Company in connection with attending or hosting meetings with
     prospective purchasers of the Offered Securities and for expenses incurred
     in distributing preliminary prospectuses and the Prospectus (including any
     amendments and supplements thereto) to the Underwriters.

       (i)  For a period of 90 days after the date of the public offering of the
     Offered Securities, the Company will not offer, sell, contract to sell,
     pledge or otherwise dispose of, directly or indirectly, or file with the
     Commission a registration statement under the Act relating to, any
     additional shares of its Securities or securities convertible into or
     exchangeable or exercisable for any shares of its Securities, or publicly
     disclose the intention to make any such offer, sale, pledge, disposition or
     filing, without the prior written consent of CSFBC, except grants of
     employee stock options pursuant to the terms of plans in effect on the date
     hereof, issuances of Securities pursuant to the exercise of such options or
     the exercise of any other employee stock options outstanding on the date
     hereof.

     6.  Conditions of the Obligations of the Underwriters. The obligations of
the several Underwriters to purchase and pay for the Firm Securities on the
First Closing Date and the Optional Securities to be purchased on each Optional
Closing Date will be subject to the accuracy of the representations and
warranties on the part of the Company herein, to the accuracy of the statements
of Company officers made pursuant to the provisions hereof, to the performance
by the Company of its obligations hereunder and to the following additional
conditions precedent:

       (a)  The Representatives shall have received a letter, dated the date of
     delivery thereof (which, if the Effective Time of the Initial Registration
     Statement is prior to the execution and delivery of this Agreement, shall
     be on or prior to the date of this Agreement or, if the Effective Time of
     the Initial Registration Statement is subsequent to the execution and
     delivery of this Agreement, shall be prior to the filing of the amendment
     or post-effective amendment to the registration statement to be filed
     shortly prior to such Effective Time), of Ernst & Young LLP confirming that
     they are independent public accountants within the meaning of the Act and
     the applicable published Rules and Regulations thereunder and stating to
     the effect that:

          (i) in their opinion the financial statements and schedules
          examined by them and included or incorporated by reference in the
          Registration Statements comply as to form in all material respects
          with the applicable accounting requirements of the Act and the related
          published Rules and Regulations;

          (ii) they have performed the procedures specified by the American
          Institute of Certified Public Accountants for a review of interim
          financial information as described in Statement of Auditing Standards
          No. 71, Interim Financial Information, on the unaudited financial
          statements included or incorporated by reference in the Registration
          Statements;

          (iii) on the basis of the review referred to in clause (ii) above, a
          reading of the latest available interim financial statements of the
          Company, inquiries of officials of the Company who have responsibility
          for financial and accounting matters and other specified procedures,
          nothing came to their attention that caused them to believe that:

                       (A) the unaudited financial statements included in the
               Registration Statements do not comply as to form in all material
               respects with the applicable accounting requirements of the Act
               and the related published Rules and Regulations or any material
               modifications should be made to such unaudited financial
               statements for them to be in conformity with generally accepted
               accounting principles;

                                       9
<PAGE>

                       (B) at the date of the latest available balance sheet
               read by such accountants, or at a subsequent specified date not
               more than three business days prior to the date of such letter,
               there was any change in the capital stock or any increase in
               short-term indebtedness or long-term debt of the Company and its
               consolidated subsidiaries or, at the date of the latest available
               balance sheet read by such accountants, there was any decrease in
               consolidated net current assets or net assets, as compared with
               amounts shown on the latest balance sheet included in the
               Prospectus; or

                       (C) for the period from the closing date of the latest
               income statement included in the Prospectus to the closing date
               of the latest available income statement read by such accountants
               there were any decreases, as compared with the corresponding
               period of the previous year, in consolidated net sales--,--or--
               net operating income--,--or in the total or per share amounts of
               consolidated income before extraordinary items or net income,

          except in all cases set forth in clauses (B) and (C) above for
          changes, increases or decreases which the Prospectus discloses have
          occurred or may occur or which are described in such letter; and

          (iv) they have compared specified dollar amounts (or percentages
          derived from such dollar amounts) and other financial information
          contained in the Registration Statements (in each case to the extent
          that such dollar amounts, percentages and other financial information
          are derived from the general accounting records of the Company and its
          subsidiaries subject to the internal controls of the Company's
          accounting system or are derived directly from such records by
          analysis or computation) with the results obtained from inquiries, a
          reading of such general accounting records and other procedures
          specified in such letter and have found such dollar amounts,
          percentages and other financial information to be in agreement with
          such results, except as otherwise specified in such letter.

     For purposes of this subsection, (i) if the Effective Time of the Initial
     Registration Statement is subsequent to the execution and delivery of this
     Agreement, "Registration Statements" shall mean the initial registration
     statement as proposed to be amended by the amendment or post-effective
     amendment to be filed shortly prior to its Effective Time, (ii) if the
     Effective Time of the Initial Registration Statement is prior to the
     execution and delivery of this Agreement but the Effective Time of the
     Additional Registration is subsequent to such execution and delivery,
     "Registration Statements" shall mean the Initial Registration Statement and
     the additional registration statement as proposed to be filed or as
     proposed to be amended by the post-effective amendment to be filed shortly
     prior to its Effective Time, and (iii) "Prospectus" shall mean the
     prospectus included in the Registration Statements. All financial
     statements and schedules included in material incorporated by reference
     into the Prospectus shall be deemed included in the Registration Statements
     for purposes of this subsection.

       (b)  If the Effective Time of the Initial Registration Statement is not
     prior to the execution and delivery of this Agreement, such Effective Time
     shall have occurred not later than 10:00 P.M., New York time, on the date
     of this Agreement or such later date as shall have been consented to by
     CSFBC. If the Effective Time of the Additional Registration Statement (if
     any) is not prior to the execution and delivery of this Agreement, such
     Effective Time shall have occurred not later than 10:00 P.M., New York
     time, on the date of this Agreement or, if earlier, the time the Prospectus
     is printed and distributed to any Underwriter, or shall have occurred at
     such later date as shall have been consented to by CSFBC. If the Effective
     Time of the Initial Registration Statement is prior to the execution and
     delivery of this Agreement, the Prospectus shall have been filed with the

                                       10
<PAGE>

     Commission in accordance with the Rules and Regulations and Section 5(a) of
     this Agreement. Prior to such Closing Date, no stop order suspending the
     effectiveness of a Registration Statement shall have been issued and no
     proceedings for that purpose shall have been instituted or, to the
     knowledge of the Company or the Representatives, shall be contemplated by
     the Commission.

       (c)  Subsequent to the execution and delivery of this Agreement, there
     shall not have occurred (i) any change, or any development or event
     involving a prospective change, in the condition (financial or other),
     business, properties or results of operations of the Company and its
     subsidiaries taken as one enterprise which, in the judgment of a majority
     in interest of the Underwriters including the Representatives, is material
     and adverse and makes it impractical or inadvisable to proceed with
     completion of the public offering or the sale of and payment for the
     Offered Securities; (ii) any downgrading in the rating of any debt
     securities of the Company by any "nationally recognized statistical rating
     organization" (as defined for purposes of Rule 436(g) under the Act), or
     any public announcement that any such organization has under surveillance
     or review its rating of any debt securities of the Company (other than an
     announcement with positive implications of a possible upgrading, and no
     implication of a possible downgrading, of such rating); (iii) any material
     suspension or material limitation of trading in securities generally on the
     New York Stock Exchange, or any setting of minimum prices for trading on
     such exchange, or any suspension of trading of any securities of the
     Company on any exchange or in the over-the-counter market; (iv) any banking
     moratorium declared by U.S. Federal or New York authorities; or (v) any
     outbreak or escalation of major hostilities in which the United States is
     involved, any declaration of war by Congress or any other substantial
     national or international calamity or emergency if, in the judgment of a
     majority in interest of the Underwriters including the Representatives, the
     effect of any such outbreak, escalation, declaration, calamity or emergency
     makes it impractical or inadvisable to proceed with completion of the
     public offering or the sale of and payment for the Offered Securities.

       (d)(1)  The Representatives shall have received an opinion, dated such
     Closing Date, of Wilson Sonsini Goodrich & Rosati Professional
     Corporation, counsel for the Company, to the effect that:

             (i)    The Company has been duly incorporated and is an existing
          corporation in good standing under the laws of the State of
          California, with corporate power and authority to own its properties
          and conduct its business as described in the Prospectus; and the
          Company is duly qualified to do business as a foreign corporation in
          good standing in all other jurisdictions in which its ownership or
          lease of property or the conduct of its business requires such
          qualification, except where the failure to be so qualified would
          individually or in the aggregate not have a Material Adverse Effect;

             (ii)   Each subsidiary of the Company has been duly incorporated
          and is an existing corporation in good standing under the laws of the
          jurisdiction of its incorporation, with power and authority (corporate
          and other) to own its properties and conduct its business as described
          in the Prospectus; and each subsidiary of the Company is duly
          qualified to do business as a foreign corporation in good standing in
          all other jurisdictions in which its ownership or lease of property or
          the conduct of its business requires such qualification, except where
          the failure to be so qualified would individually or in the aggregate
          not have a Material Adverse Effect; all of the issued and outstanding
          capital stock of each subsidiary of the Company has been duly
          authorized and validly issued and is fully paid and nonassessable; and
          the capital stock of each subsidiary owned by the Company, directly or
          through subsidiaries, is owned free from liens, encumbrances and
          defects;

                                       11
<PAGE>

             (iii)  The Offered Securities delivered on such Closing Date and
          all other outstanding shares of the Common Stock of the Company have
          been duly authorized and validly issued, are fully paid and
          nonassessable and conform to the description thereof contained in the
          Prospectus; and the stockholders of the Company have no preemptive
          rights with respect to the Securities except as have been validly
          waived;

             (iv)   There are no contracts, agreements or understandings known
          to such counsel between the Company and any person granting such
          person the right to require the Company to file a registration
          statement under the Act with respect to any securities of the
          Company owned or to be owned by such person or to require the
          Company to include such securities in the securities registered
          pursuant to the Registration Statement or in any securities being
          registered pursuant to any other registration statement filed by the
          Company under the Act, which have not been validly waived with
          respect to this offering of the Offered Securities;

             (v)    The Company is not and, after giving effect to the offering
          and sale of the Offered Securities and the application of the
          proceeds thereof as described in the Prospectus, will not be an
          "investment company" as defined in the Investment Company Act of
          1940;

             (vi)   No consent, approval, authorization or order of, or filing
          with, any governmental agency or body or any court is required for
          the consummation of the transactions contemplated by this Agreement
          in connection with the issuance or sale of the Offered Securities by
          the Company, except such as have been obtained and made under the
          Act and such as may be required under state securities laws;

             (vii)  The execution, delivery and performance of this Agreement
          and the issuance and sale of the Offered Securities will not result
          in a breach or violation of any of the terms and provisions of, or
          constitute a default under, any statute, any rule, regulation or
          order of any governmental agency or body or any court having
          jurisdiction over the Company or any subsidiary of the Company or
          any of their properties, or any material agreement or instrument to
          which the Company or any such subsidiary is a party or by which the
          Company or any such subsidiary is bound or to which any of the
          properties of the Company or any such subsidiary is subject, or the
          charter or by-laws of the Company or any such subsidiary, and the
          Company has full power and authority to authorize, issue and sell
          the Offered Securities as contemplated by this Agreement;

             (viii) Except as disclosed in the Prospectus, to such counsel's
          knowledge, there are no pending actions, suits or proceedings
          against or affecting the Company, any of its subsidiaries or any of
          their respective properties that, if determined adversely to the
          Company or any of its subsidiaries, would individually or in the
          aggregate have a Material Adverse Effect, or would materially and
          adversely affect the ability of the Company to perform its
          obligations under this Agreement, or which are otherwise material in
          the context of the sale of the Offered Securities; and no such
          actions, suits or proceedings are threatened or, to such counsel's
          knowledge, contemplated;

             (ix)   The Initial Registration Statement was declared effective
          under the Act as of the date and time specified in such opinion, the
          Additional Registration Statement (if any) was filed and became
          effective under the Act as of the date and time (if determinable)
          specified in such opinion, the Prospectus either was filed with the
          Commission pursuant to the subparagraph of Rule 424(b) specified in
          such opinion on the date specified therein or was included in the
          Initial Registration Statement or the Additional Registration
          Statement (as the case may be), and, to the knowledge of such

                                       12
<PAGE>

          counsel, no stop order suspending the effectiveness of a
          Registration Statement or any part thereof has been issued and no
          proceedings for that purpose have been instituted or are pending or
          contemplated under the Act, and each Registration Statement and the
          Prospectus, and each amendment or supplement thereto, as of their
          respective effective or issue dates, complied as to form in all
          material respects with the requirements of the Act and the Rules and
          Regulations;

             (x)    This Agreement has been duly authorized, executed and
          delivered by the Company;

             (xi)   The Company's Annual Report on Form 10-K for the fiscal
          year ended September 30, 1999, the Company's Current Report on Form
          8-K dated November 10, 1999, the Company's Proxy Statement dated
          December 11, 1998 from the Annual Meeting of Shareholders held on
          January 22, 1999, and any filing made by the Company with the
          Commission under Sections 13(a), 13(c), 14 or 15(d) of the Exchange
          Act from the date of this Agreement until the offering of the
          Offered Securities has been completed (other than the financial
          statements or other financial data contained therein), when they
          were filed with the Commission, complied as to form in all material
          respects with the requirements of the Exchange Act and the Rules and
          Regulations; and

             (xii)  Such counsel shall also state that it has no reason to
          believe that any part of a Registration Statement or any amendment
          thereto, as of its effective date or as of such Closing Date,
          contained any untrue statement of a material fact or omitted to
          state any material fact required to be stated therein or necessary
          to make the statements therein not misleading or that the Prospectus
          or any amendment or supplement thereto, as of its issue date or as
          of such Closing Date, contained any untrue statement of a material
          fact or omitted to state any material fact necessary in order to
          make the statements therein, in the light of the circumstances under
          which they were made, not misleading; the descriptions in the
          Registration Statements and Prospectus of statutes, legal and
          governmental proceedings and contracts and other documents are
          accurate and fairly present the information required to be shown;
          and such counsel does not know of any legal or governmental
          proceedings required to be described in a Registration Statement or
          the Prospectus which are not described as required or of any
          contracts or documents of a character required to be described in a
          Registration Statement or the Prospectus or to be filed as exhibits
          to a Registration Statement which are not described and filed as
          required; it being understood that such counsel need express no
          opinion as to the financial statements or other financial data
          contained or incorporated by reference in the Registration
          Statements or the Prospectus.

       (d)(2)  The Representatives shall have received an opinion, dated such
     Closing Date, of Randall H. Holliday, in-house counsel for the Company,
     to the effect that:

             (i)    The Company and its subsidiaries own, possess or can
          acquire on reasonable terms, adequate trademarks, trade names and
          other rights to inventions, know-how, patents, copyrights,
          confidential information and other intellectual property necessary
          to conduct the business now operated by them, or presently employed
          by them, and have not received any notice of infringement of or
          conflict with asserted rights of others with respect to any such
          intellectual property rights that, if determined adversely to the
          Company or any of its subsidiaries, would individually or in the
          aggregate have a Material Adverse Effect; and

             (ii)   Except as disclosed in the Prospectus, there are no
          pending actions, suits or proceedings against or affecting the
          Company, any of its subsidiaries or any of their

                                       13
<PAGE>

        respective properties that, if determined adversely to the Company or
        any of its subsidiaries, would individually or in the aggregate have a
        Material Adverse Effect, or would materially and adversely affect the
        ability of the Company to perform its obligations under this Agreement,
        or which are otherwise material in the context of the sale of the
        Offered Securities; and no such actions, suits or proceedings are
        threatened or, to such counsel's knowledge, contemplated.

        (e)  The Representatives shall have received from Shearman & Sterling,
     counsel for the Underwriters, such opinion or opinions, dated such Closing
     Date, with respect to the validity of the Offered Securities delivered on
     such Closing Date, the Registration Statements, the Prospectus and other
     related matters as the Representatives may require, and the Company shall
     have furnished to such counsel such documents as they request for the
     purpose of enabling them to pass upon such matters.

        (f)  The Representatives shall have received a certificate, dated such
     Closing Date, of the President or any Vice President and a principal
     financial or accounting officer of the Company in which such officers, to
     the best of their knowledge after reasonable investigation, shall state
     that: the representations and warranties of the Company in this Agreement
     are true and correct; the Company has complied with all agreements and
     satisfied all conditions on its part to be performed or satisfied hereunder
     at or prior to such Closing Date; no stop order suspending the
     effectiveness of any Registration Statement has been issued and no
     proceedings for that purpose have been instituted or are contemplated by
     the Commission; the Additional Registration Statement (if any) satisfying
     the requirements of subparagraphs (1) and (3) of Rule 462(b) was filed
     pursuant to Rule 462(b), including payment of the applicable filing fee in
     accordance with Rule 111(a) or (b) under the Act, prior to the time the
     Prospectus was printed and distributed to any Underwriter; and, subsequent
     to the date of the most recent financial statements in the Prospectus,
     there has been no material adverse change, nor any development or event
     involving a prospective material adverse change, in the condition
     (financial or other), business, properties or results of operations of the
     Company and its subsidiaries taken as a whole except as set forth in or
     contemplated by the Prospectus or as described in such certificate.

        (g)  The Representatives shall have received a letter, dated such
     Closing Date, of Ernst & Young LLP which meets the requirements of
     subsection (a) of this Section, except that the specified date referred to
     in such subsection will be a date not more than three days prior to such
     Closing Date for the purposes of this subsection.

        (h)  At the date of this Agreement, the Representatives shall have
     received an agreement substantially in the form of Exhibit A hereto signed
     by each of the Company's directors and executive officers.

The Company will furnish the Representatives with such conformed copies of such
opinions, certificates, letters and documents as the Representatives reasonably
request.  CSFBC may in its sole discretion waive on behalf of the Underwriters
compliance with any conditions to the obligations of the Underwriters hereunder,
whether in respect of an Optional Closing Date or otherwise.

        7.  Indemnification and Contribution. (a) The Company will indemnify and
hold harmless each Underwriter, its partners, directors and officers and each
person, if any, who controls such Underwriter within the meaning of Section 15
of the Act, against any losses, claims, damages or liabilities, joint or
several, to which such Underwriter may become subject, under the Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect thereof) arise out of or are based upon any untrue statement or alleged
untrue statement of any material fact contained in any Registration Statment,
the Prospectus, or any amendment or supplement thereto, or any related
preliminary prospectus, or arise out of or are based upon the omission or
alleged omission to state therein a material fact required to be stated

                                       14
<PAGE>

therein or necessary to make the statements therein not misleading, and will
reimburse each Underwriter for any legal or other expenses reasonably incurred
by such Underwriter in connection with investigating or defending any such loss,
claim, damage, liability or action as such expenses are incurred; provided,
however, that the Company will not be liable in any such case to the extent that
any such loss, claim, damage or liability arises out of or is based upon an
untrue statement or alleged untrue statement in or omission or alleged omission
from any of such documents in reliance upon and in conformity with written
information furnished to the Company by any Underwriter through the
Representatives specifically for use therein, it being understood and agreed
that the only such information furnished by any Underwriter consists of the
information described as such in subsection (b) below; and provided, further,
that with respect to any untrue statement or alleged untrue statement in or
omission or alleged omission from any preliminary prospectus the indemnity
agreement contained in this subsection (a) shall not inure to the benefit of any
Underwriter from whom the person asserting any such losses, claims, damages or
liabilities purchased the Offered Securities concerned, to the extent that a
prospectus relating to such Offered Securities was required to be delivered by
such Underwriter under the Act in connection with such purchase and any such
loss, claim, damage or liability of such Underwriter results from the fact that
there was not sent or given to such person, at or prior to the written
confirmation of the sale of such Offered Securities to such person, a copy of
the Prospectus (exclusive of material incorporated by reference) if the Company
had previously furnished copies thereof to such Underwriter.

        (b)  Each Underwriter will severally and not jointly indemnify and hold
harmless the Company, its directors and officers and each person, if any who
controls the Company within the meaning of Section 15 of the Act, against any
losses, claims, damages or liabilities to which the Company may become subject,
under the Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon any
untrue statement or alleged untrue statement of any material fact contained in
any Registration Statement, the Prospectus, or any amendment or supplement
thereto, or any related preliminary prospectus, or arise out of or are based
upon the omission or the alleged omission to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading, in each case to the extent, but only to the extent, that such untrue
statement or alleged untrue statement or omission or alleged omission was made
in reliance upon and in conformity with written information furnished to the
Company by such Underwriter through the Representatives specifically for use
therein, and will reimburse any legal or other expenses reasonably incurred by
the Company in connection with investigating or defending any such loss, claim,
damage, liability or action as such expenses are incurred, it being understood
and agreed that the only such information furnished by any Underwriter consists
of the following information in the Prospectus furnished on behalf of each
Underwriter: the concession and reallowance figures appearing in the paragraph
under the caption "Underwriting" and the information contained in the [and ]
paragraphs under the caption "Underwriting".

        (c)  Promptly after receipt by an indemnified party under this Section
of notice of the commencement of any action, such indemnified party will, if a
claim in respect thereof is to be made against the indemnifying party under
subsection (a) or (b) above, notify the indemnifying party of the commencement
thereof; but the omission so to notify the indemnifying party will not relieve
it from any liability which it may have to any indemnified party otherwise than
under subsection (a) or (b) above. In case any such action is brought against
any indemnified party and it notifies the indemnifying party of the commencement
thereof, the indemnifying party will be entitled to participate therein and, to
the extent that it may wish, jointly with any other indemnifying party similarly
notified, to assume the defense thereof, with counsel satisfactory to such
indemnified party (who shall not, except with the consent of the indemnified
party, be counsel to the indemnifying party), and after notice from the
indemnifying party to such indemnified party of its election so to assume the
defense thereof, the indemnifying party will not be liable to such indemnified
party under this Section for any legal or other expenses subsequently incurred
by such indemnified party in connection with the defense thereof other than
reasonable costs of investigation. No indemnifying party shall, without the
prior written consent of the indemnified party, effect any settlement of any
pending or threatened action in respect of which any indemnified party is or
could have been a party and indemnity could have been sought hereunder by such
indemnified party unless such

                                       15
<PAGE>

settlement (i) includes an unconditional release of such indemnified party from
all liability on any claims that are the subject matter of such action and (ii)
does not include a statement as to, or an admission of, fault, culpability or a
failure to act by or on behalf of an indemnified party.

        (d)  If the indemnification provided for in this Section is unavailable
or insufficient to hold harmless an indemnified party under subsection (a) or
(b) above, then each indemnifying party shall contribute to the amount paid or
payable by such indemnified party as a result of the losses, claims, damages or
liabilities referred to in subsection (a) or (b) above (i) in such proportion as
is appropriate to reflect the relative benefits received by the Company on the
one hand and the Underwriters on the other from the offering of the Securities
or (ii) if the allocation provided by clause (i) above is not permitted by
applicable law, in such proportion as is appropriate to reflect not only the
relative benefits referred to in clause (i) above but also the relative fault of
the Company on the one hand and the Underwriters on the other in connection with
the statements or omissions which resulted in such losses, claims, damages or
liabilities as well as any other relevant equitable considerations. The relative
benefits received by the Company on the one hand and the Underwriters on the
other shall be deemed to be in the same proportion as the total net proceeds
from the offering (before deducting expenses) received by the Company bear to
the total underwriting discounts and commissions received by the Underwriters.
The relative fault shall be determined by reference to, among other things,
whether the untrue or alleged untrue statement of a material fact or the
omission or alleged omission to state a material fact relates to information
supplied by the Company or the Underwriters and the parties' relative intent,
knowledge, access to information and opportunity to correct or prevent such
untrue statement or omission. The amount paid by an indemnified party as a
result of the losses, claims, damages or liabilities referred to in the first
sentence of this subsection (d) shall be deemed to include any legal or other
expenses reasonably incurred by such indemnified party in connection with
investigating or defending any action or claim which is the subject of this
subsection (d). Notwithstanding the provisions of this subsection (d), no
Underwriter shall be required to contribute any amount in excess of the amount
by which the total price at which the Securities underwritten by it and
distributed to the public were offered to the public exceeds the amount of any
damages which such Underwriter has otherwise been required to pay by reason of
such untrue or alleged untrue statement or omission or alleged omission. No
person guilty of fraudulent misrepresentation (within the meaning of Section
11(f) of the Act) shall be entitled to contribution from any person who was not
guilty of such fraudulent misrepresentation. The Underwriters' obligations in
this subsection (d) to contribute are several in proportion to their respective
underwriting obligations and not joint.

        (e)  The obligations of the Company under this Section shall be in
addition to any liability which the Company may otherwise have and shall extend,
upon the same terms and conditions, to each person, if any, who controls any
Underwriter within the meaning of the Act; and the obligations of the
Underwriters under this Section shall be in addition to any liability which the
respective Underwriters may otherwise have and shall extend, upon the same terms
and conditions, to each director of the Company, to each officer of the Company
who has signed a Registration Statement and to each person, if any, who controls
the Company within the meaning of the Act.

        8.  Default of Underwriters. If any Underwriter or Underwriters default
in their obligations to purchase Offered Securities hereunder on either the
First or any Optional Closing Date and the aggregate number of shares of Offered
Securities that such defaulting Underwriter or Underwriters agreed but failed to
purchase does not exceed 10% of the total number of shares of Offered Securities
that the Underwriters are obligated to purchase on such Closing Date, CSFBC may
make arrangements satisfactory to the Company for the purchase of such Offered
Securities by other persons, including any of the Underwriters, but if no such
arrangements are made by such Closing Date, the non-defaulting Underwriters
shall be obligated severally, in proportion to their respective commitments
hereunder, to purchase the Offered Securities that such defaulting Underwriters
agreed but failed to purchase on such Closing Date. If any Underwriter or
Underwriters so default and the aggregate number of shares of Offered Securities
with respect to which such default or defaults occur exceeds 10% of the total
number of shares of Offered Securities that the Underwriters are obligated to
purchase on such Closing Date and arrangements

                                       16
<PAGE>

satisfactory to CSFBC and the Company for the purchase of such Offered
Securities by other persons are not made within 36 hours after such default,
this Agreement will terminate without liability on the part of any non-
defaulting Underwriter or the Company, except as provided in Section 9 (provided
that if such default occurs with respect to Optional Securities after the First
Closing Date, this Agreement will not terminate as to the Firm Securities or any
Optional Securities purchased prior to such termination). As used in this
Agreement, the term "Underwriter" includes any person substituted for an
Underwriter under this Section. Nothing herein will relieve a defaulting
Underwriter from liability for its default.

        9.  Survival of Certain Representations and Obligations. The respective
indemnities, agreements, representations, warranties and other statements of the
Company or its officers and of the several Underwriters set forth in or made
pursuant to this Agreement will remain in full force and effect, regardless of
any investigation, or statement as to the results thereof, made by or on behalf
of any Underwriter, the Company or any of their respective representatives,
officers or directors or any controlling person, and will survive delivery of
and payment for the Offered Securities. If this Agreement is terminated pursuant
to Section 8 or if for any reason the purchase of the Offered Securities by the
Underwriters is not consummated, the Company shall remain responsible for the
expenses to be paid or reimbursed by it pursuant to Section 5 and the respective
obligations of the Company and the Underwriters pursuant to Section 7 shall
remain in effect, and if any Offered Securities have been purchased hereunder
the representations and warranties in Section 2 and all obligations under
Section 5 shall also remain in effect. If the purchase of the Offered Securities
by the Underwriters is not consummated for any reason other than solely because
of the termination of this Agreement pursuant to Section 8 or the occurrence of
any event specified in clause (iii), (iv) or (v) of Section 6(c), the Company
will reimburse the Underwriters for all out-of-pocket expenses (including fees
and disbursements of counsel) reasonably incurred by them in connection with the
offering of the Offered Securities.

        10.  Notices. All communications hereunder will be in writing and, if
sent to the Underwriters, will be mailed, delivered or telegraphed and confirmed
to the Representatives, c/o Credit Suisse First Boston Corporation, Eleven
Madison Avenue, New York, New York 10010-3629, Attention: Investment Banking
Department--Transactions Advisory Group, or, if sent to the Company, will be
mailed, delivered or telegraphed and confirmed to it at 2300 Corporate Center
Drive, Thousand Oaks, California 91320, Attention: ; provided, however, that any
notice to an Underwriter pursuant to Section 7 will be mailed, delivered or
telegraphed and confirmed to such Underwriter.

        11.  Successors. This Agreement will inure to the benefit of and be
binding upon the parties hereto and their respective successors and the officers
and directors and controlling persons referred to in Section 7, and no other
person will have any right or obligation hereunder.

        12.  Representation of Underwriters. The Representatives will act for
the several Underwriters in connection with this financing, and any action under
this Agreement taken by the Representatives jointly or by CSFBC will be binding
upon all the Underwriters.

        13.  Counterparts.  This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original, but all such
counterparts shall together constitute one and the same Agreement.

        14.  Applicable Law. This Agreement shall be governed by, and construed
in accordance with, the laws of the State of New York, without regard to
principles of conflicts of laws.

  The Company and each Underwriter hereby submit to the non-exclusive
jurisdiction of the Federal and state courts in the Borough of Manhattan in The
City of New York in any suit or proceeding arising out of or relating to this
Agreement or the transactions contemplated hereby.

                                       17
<PAGE>

        If the foregoing is in accordance with the Representatives'
understanding of our agreement, kindly sign and return to the Company one of the
counterparts hereof, whereupon it will become a binding agreement between the
Company and the several Underwriters in accordance with its terms.

                               Very truly yours,

                                        Xircom, Inc.

                                             By........................
                                             Name......................
                                             Title.....................

The foregoing Underwriting Agreement is hereby
 confirmed and accepted as of the date first above
 written.



  Credit Suisse First Boston Corporation

  CIBC World Markets Corp.

  SG Cowen Securities Corporation


     Acting on behalf of themselves and as the
      Representatives of the several
      Underwriters

  By Credit Suisse First Boston Corporation


   By................................
   Name..............................
   Title.............................

                                       18
<PAGE>

                                  SCHEDULE A



<TABLE>
<CAPTION>
                      Underwriter                                                       Number of
                      ----------                                                     Firm Securities
                                                                                     ---------------
<S>                                                                                  <C>
Credit Suisse First Boston Corporation.....................................
CIBC World Markets Corp.
SG Cowen Securities Corporation















                                                                                     ______________

               Total.......................................................
</TABLE>

                                       19
<PAGE>

                                   EXHIBIT A

                                                                   [Insert date]

Xircom, Inc.
2300 Corporate Center Drive
Thousand Oaks, CA  91320

Credit Suisse First Boston
CIBC World Markets Corp.
SG Cowen Securities Corporation
  As Representatives of the Several Underwriters
     c/o Credit Suisse First Boston Corporation
     Eleven Madison Avenue
     New York, NY  10010-3629

Ladies and Gentlemen:

        As an inducement to the Underwriters to execute the Underwriting
Agreement, pursuant to which an offering for the common stock (the "Securities")
of Xircom, Inc. (the "Company") will be made, and in recognition of the benefit
that such an offering will confer upon the undersigned as a stockholder, and for
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the undersigned hereby agrees that from the date hereof
until 90 days after the public offering (the "Public Offering Date") of the
Securities pursuant to the Underwriting Agreement to which you are or expect to
become parties, the undersigned will not offer, sell, contract to sell, pledge
or otherwise dispose of, directly or indirectly, any shares of Securities or
securities convertible into or exchangeable or exercisable for any shares of
Securities whether now owned or hereafter acquired by the undersigned, or
publicly disclose the intention to make any such offer, sale, pledge or disposal
without the prior written consent of Credit Suisse First Boston Corporation.

        Any Securities received upon exercise of options granted to the
undersigned will also be subject to this Agreement. Any Securities acquired by
the undersigned in the open market will not be subject to this Agreement. A
transfer of Securities to a family member or trust will be permitted, provided
that the transferee agrees in writing to be bound by the terms of this
Agreement.

        In furtherance of the foregoing, the Company and its transfer agent and
registrar are hereby authorized to decline to make any transfer of shares of
Securities if such transfer would constitute a violation or breach of this
Agreement.

        This Agreement shall be binding on the undersigned and the respective
successors, heirs, personal representatives and assigns of the undersigned. This
Agreement shall lapse and become null and void if the Public Offering Date shall
not have occurred on or before _______ __, ____.

                               Very truly yours,



                               ...................................
                               [Name of stockholder]

                                       20

<PAGE>

                                                                    EXHIBIT 23.1

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the reference to our firm under the caption "Experts" in the
Registration Statement (Form S-3) and related Prospectus of Xircom, Inc., filed
on November 19, 1999, for the registration of 3,500,000 shares of its common
stock and to the incorporation by reference therein of our report dated
October 18, 1999, with respect to the consolidated financial statements and
schedule of Xircom, Inc. included in its Annual Report on Form 10-K for the
year ended September 30, 1999 and to the use of our report dated November 5,
1999, with respect to the supplemental consolidated financial statements and
schedule of Xircom, Inc. included herein and in its Current Report on Form 8-K
dated November 10, 1999, filed with the Securities and Exchange Commission.

                                          /s/ Ernst & Young LLP

Woodland Hills, California

November 18, 1999


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