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                                                                     EXHIBIT 4.1

                                   $75,000,000

                               RadiSys Corporation

             1 -3/8% Convertible Senior Notes due November 15, 2023

                          REGISTRATION RIGHTS AGREEMENT

                                                               November 13, 2003


Credit Suisse First Boston LLC
Banc of America Securities LLC
c/o Credit Suisse First Boston LLC
Eleven Madison Avenue
New York, New York 10010 3629

Dear Sirs:

      RadiSys Corporation, an Oregon corporation (the "COMPANY"), proposes to
issue and sell to Credit Suisse First Boston LLC and Banc of America Securities
LLC (each an "INITIAL PURCHASER" and collectively, the "INITIAL PURCHASERS"),
upon the terms set forth in a purchase agreement of even date herewith (the
"PURCHASE AGREEMENT"), $75,000,000 aggregate principal amount (plus up to an
additional $25,000,000 principal amount) of its 1 -3/8% Convertible Senior Notes
due November 15, 2023 (the "INITIAL SECURITIES"). The Initial Securities will be
convertible into shares of common stock, no par value, of the Company (the
"COMMON STOCK") at the conversion price set forth in the Offering Circular dated
November 13, 2003 (the "OFFERING CIRCULAR"). The Initial Securities will be
issued pursuant to an Indenture, dated as of November 19, 2003 (the
"INDENTURE"), among the Company and JPMorgan Chase Bank, as trustee (the
"TRUSTEE"). As an inducement to the Initial Purchasers to enter into the
Purchase Agreement, the Company agrees with the Initial Purchasers, for the
benefit of (i) the Initial Purchasers and (ii) the holders of the Initial
Securities and the Common Stock issuable upon conversion of the Initial
Securities (collectively, the "SECURITIES") from time to time until such time as
such Securities have been sold pursuant to a Shelf Registration Statement (as
defined below) (each of the forgoing a "HOLDER" and collectively the "HOLDERS"),
as follows:

      1.    Shelf Registration. (a) The Company shall, at its cost, prepare and,
as promptly as practicable (but in no event more than 120 days after so required
or requested pursuant to this Section 1) file with the Securities and Exchange
Commission (the "Commission") and thereafter use its reasonable best efforts to
cause to be declared effective as soon as practicable (but in no event more than
210 days after the latest date of original issuance of the Initial Securities) a
registration statement on Form S-3 (the "SHELF REGISTRATION STATEMENT" relating
to the offer and sale of the Transfer Restricted Securities (as defined in
Section 5 hereof) by the Holders thereof from time to time in accordance with
the methods of distribution set forth in the Shelf Registration Statement and
Rule 415 under the Securities Act of 1933, as amended (the "SECURITIES ACT")
(hereinafter, the "SHELF REGISTRATION"); provided, however, that no Holder
(other than an Initial Purchaser) shall be entitled to have the Securities held
by it covered by such Shelf Registration Statement unless such Holder agrees in
writing to be bound by all the provisions of this Agreement applicable to such
Holder.

            (b)   The Company shall use its reasonable best efforts to keep the
Shelf Registration Statement continuously effective in order to permit the
prospectus included therein (the "PROSPECTUS") to be lawfully delivered by the
Holders of the relevant Securities, for a period of two years (or for such
longer period if extended pursuant to Section 2(h) below) from the date of its
effectiveness or such shorter period that will terminate when all the Securities
covered by the Shelf Registration Statement (i) have been sold pursuant thereto
or (ii) are no longer restricted securities (as defined in Rule 144(k) under the
Securities Act, or any successor rule thereof), assuming for this purpose that
the Holders thereof are not affiliates of the Company (in any such case, such
period being called the "SHELF REGISTRATION PERIOD").

            (c)   Notwithstanding any other provisions of this Agreement to the
contrary, the Company shall cause the Shelf Registration Statement and the
Prospectus and any amendment or supplement thereto, as of the effective date of
the Shelf Registration Statement, amendment or supplement, (i) to comply in all
material respects with the applicable
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requirements of the Securities Act and the rules and regulations of the
Commission and (ii) not to contain any untrue statement of a material fact or
omit to state a material fact required to be stated therein or necessary in
order to make the statements therein, in light of the circumstances under which
they were made, not misleading.

      2.    Registration Procedures. In connection with the Shelf Registration
contemplated by Section 1 hereof, the following provisions shall apply:

            (a)   The Company shall (i) furnish to each Initial Purchaser, prior
to the filing thereof with the Commission, a copy of the Shelf Registration
Statement and each amendment thereto and each supplement, if any, to the
prospectus included therein and, in the event that an Initial Purchaser (with
respect to any portion of an unsold allotment from the original offering) is
participating in the Shelf Registration Statement, shall use its reasonable best
efforts to reflect in each such document, when so filed with the Commission,
such comments as such Initial Purchaser reasonably may propose; and (ii) subject
to receiving a completed questionnaire in accordance with Section 2(l), include
the names of the Holders who propose to sell Securities pursuant to the Shelf
Registration Statement as selling security holders.

            (b)   The Company shall give written notice to the Initial
Purchasers and the Holders of the Securities (which notice pursuant to clauses
(ii)-(v) of this Section 2(b) shall be accompanied by an instruction to suspend
the use of the Prospectus until the requisite changes have been made):

                  (i)   when the Shelf Registration Statement or any amendment
            thereto has been filed with the Commission and when the Shelf
            Registration Statement or any post-effective amendment thereto has
            become effective;

                  (ii)  of any request by the Commission for amendments or
            supplements to the Shelf Registration Statement or the Prospectus or
            for additional information;

                  (iii) of the issuance by the Commission of any stop order
            suspending the effectiveness of the Shelf Registration Statement or
            the initiation of any proceedings for that purpose;

                  (iv)  of the receipt by the Company or its legal counsel of
            any notification with respect to the suspension of the qualification
            of the Securities for sale in any jurisdiction or the initiation or
            threatening of any proceeding for such purpose; and

                  (v)   of the happening of any event that requires the Company
            to make changes in the Shelf Registration Statement or the
            Prospectus in order that the Shelf Registration Statement or the
            Prospectus does not contain an untrue statement of a material fact
            nor omit to state a material fact required to be stated therein or
            necessary to make the statements therein (in the case of the
            Prospectus, in light of the circumstances under which they were
            made) not misleading.

            (c)   The Company shall make every reasonable effort to obtain the
withdrawal at the earliest possible time, of any order suspending the
effectiveness of the Shelf Registration Statement.

            (d)   The Company shall furnish to each Holder of Securities
included within the coverage of the Shelf Registration, without charge, at least
one copy of the Shelf Registration Statement and any post effective amendment
thereto, including financial statements and schedules, and, if the Holder so
requests in writing, all exhibits thereto (including those, if any, incorporated
by reference).

            (e)   The Company shall, during the Shelf Registration Period,
deliver to each Holder of Securities included within the coverage of the Shelf
Registration, without charge, as many copies of the Prospectus (including each
preliminary prospectus) included in the Shelf Registration Statement and any
amendment or supplement thereto as such person may reasonably request. The
Company consents, subject to the provisions of this Agreement, to the use of the
Prospectus or any amendment or supplement thereto by each of the selling Holders
of the Securities in connection with the offering and sale of the Securities
covered by the Prospectus, or any amendment or supplement thereto, included in
the Shelf Registration Statement.

            (f)   Prior to any public offering of the Securities pursuant to the
Shelf Registration Statement, the Company shall use reasonable best efforts to
register or qualify, or cooperate with the Holders of the Securities included
therein and their respective counsel in connection with the registration or
qualification of, the Securities for offer and sale
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under the securities or "blue sky" laws of such states of the United States as
any Holder of the Securities reasonably requests in writing and do any and all
other acts or things necessary or advisable to enable the offer and sale in such
jurisdictions of the Securities covered by such Registration Statement;
provided, however, that the Company shall not be required to (i) qualify
generally to do business in any jurisdiction where it is not then so qualified
or (ii) take any action which would subject it to general service of process or
to taxation in any jurisdiction where it is not then so subject.

            (g)   The Company shall cooperate with the Holders of the Securities
to facilitate the timely preparation and delivery of certificates representing
the Securities to be sold pursuant to any Registration Statement free of any
restrictive legends and in such denominations and registered in such names as
the Holders may request within a reasonable period of time prior to sales of the
Securities pursuant to the Shelf Registration Statement.

            (h)   Upon the occurrence of any event contemplated by paragraphs
(ii) through (v) of Section 2(b) above during the period for which the Company
is required to maintain an effective Shelf Registration Statement, the Company
shall promptly prepare and file a post effective amendment to the Shelf
Registration Statement or an amendment or supplement to the Prospectus and any
other required document so that, as thereafter delivered to Holders or
purchasers of the Securities , the Prospectus will not contain an 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, in light of the
circumstances under which they were made, not misleading. If the Company
notifies the Initial Purchasers and the Holders in accordance with paragraphs
(ii) through (v) of Section 2(b) above to suspend the use of the Prospectus
until the requisite changes to the Prospectus have been made, then the Initial
Purchasers and the Holders shall suspend use of such Prospectus, and the period
of effectiveness of the Shelf Registration Statement provided for in Section
1(b) above shall be extended by the number of days from and including the date
of the giving of such notice to and including the date when the Initial
Purchasers and the Holders shall have received such amended or supplemented
prospectus pursuant to this Section 2(h). In any event, the period of any
suspension of the use of the Prospectus pursuant to paragraphs (ii) through (v)
of Section 2(b) above shall not exceed 60 days in any 100-day period or an
aggregate of 100 days in any 12-month period.

            (i)   Not later than the effective date of the Shelf Registration
Statement, the Company will provide CUSIP numbers for the Initial Securities and
the Common Stock registered under the Shelf Registration Statement, and provide
the Trustee with printed certificates for the Initial Securities, in a form
eligible for deposit with The Depository Trust Company.

            (j)   The Company will comply with all rules and regulations of the
Commission to the extent and so long as they are applicable to the Shelf
Registration and will make generally available to its security holders (or
otherwise provide in accordance with Section 11(a) of the Securities Act) an
earnings statement satisfying the provisions of Section 11(a) of the Securities
Act, no later than 45 days after the end of a 12-month period (or 90 days, if
such period is a fiscal year) beginning with the first month of the Company's
first fiscal quarter commencing after the effective date of the Shelf
Registration Statement, which statement shall cover such 12-month period.

            (k)   The Company shall cause the Indenture to be qualified under
the Trust Indenture Act of 1939, as amended, (the "TRUST INDENTURE ACT") in a
timely manner and containing such changes, if any, as shall be necessary for
such qualification. In the event that such qualification would require the
appointment of a new trustee under the Indenture, the Company shall appoint a
new trustee thereunder pursuant to the applicable provisions of the Indenture.

            (l)   The Company may require each Holder of Securities to be sold
pursuant to the Shelf Registration Statement to deliver to Company a completed
questionnaire substantially in the form attached as Annex A to the Offering
Circular and to furnish to the Company such other information regarding the
Holder and the distribution of the Securities as the Company may from time to
time reasonably require for inclusion in the Shelf Registration Statement, and
the Company may exclude from such registration the Securities of any Holder that
fails to furnish such information within a reasonable time after receiving such
request. If a Holder supplies to the Company the questionnaire described in this
Section after the Shelf Registration Statement is declared affective by the
Commission and within sixty (60) days after the date such questionnaire was
first sent to the Holder, the Company shall use its reasonable best efforts to
supplement the Shelf Registration Statement within thirty (30) days of the
Company's receipt of such questionnaire in order to name such Holder in the
Shelf Registration Statement.

            (m)   The Company shall enter into such customary agreements
(including, if requested, an underwriting agreement in customary form) and take
all such other actions, if any, as any Holder shall reasonably request in order
to facilitate the disposition of the Securities pursuant to the Shelf
Registration Statement.
<PAGE>
            (n)   The Company shall (i) make reasonably available for inspection
by the Holders, any underwriter participating in any disposition pursuant to the
Shelf Registration Statement and any attorney, accountant or other agent
retained by the Holders or any such underwriter, all relevant financial and
other records, pertinent corporate documents and properties of the Company and
(ii) cause the Company's officers, directors, employees, accountants and
auditors to supply all relevant information reasonably requested by the Holders
or any such underwriter, attorney, accountant or agent in connection with the
Shelf Registration Statement, in each case, as shall be reasonably necessary to
enable such persons to conduct a reasonable investigation within the meaning of
Section 11 of the Securities Act; provided, however, that the foregoing
inspection and information gathering shall be coordinated on behalf of the
Initial Purchasers by the Company and on behalf of the other parties, by one
counsel designated by and on behalf of such other parties as described in
Section 3 hereof; and provided further, that any records, information or
documents that are designated by the Company in writing as confidential shall be
kept confidential by such persons unless disclosure of such records, information
or documents is required by court or administrative order or such records,
information or documents become publicly available.

            (o)   The Company, if requested by any Holder of Securities covered
by the Shelf Registration Statement, shall cause (i) its counsel to deliver an
opinion and updates thereof relating to the Securities in customary form
addressed to such Holders and the managing underwriters, if any, thereof, and
dated, in the case of the initial opinion, the effective date of such Shelf
Registration Statement (it being agreed that the matters to be covered by such
opinion shall include, without limitation, the due incorporation and good
standing of the Company and its subsidiaries; the qualification of the Company
and its subsidiaries to transact business as foreign corporations; the due
authorization, execution and delivery of the relevant agreement of the type
referred to in Section 2(m) hereof; the due authorization, execution,
authentication and issuance, and the validity and enforceability, of the
Securities; the absence of material legal or governmental proceedings involving
the Company and its subsidiaries; the absence of governmental approvals required
to be obtained in connection with the Shelf Registration Statement, the offering
and sale of the Securities, or any agreement of the type referred to in Section
2(m) hereof; the compliance as to the form of the Shelf Registration Statement
and any documents incorporated by reference therein and of the Indenture with
the requirements of the Securities Act and the Trust Indenture Act,
respectively; and, as of the date of the opinion and as of the effective date of
the Shelf Registration Statement or most recent post effective amendment
thereto, as the case may be, the absence from the Shelf Registration Statement
and the Prospectus, as then amended or supplemented, and from any documents
incorporated by reference therein of an untrue statement of a material fact or
the omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading (in the case of any such
documents, in the light of the circumstances existing at the time that such
documents were filed with the Commission under the Exchange Act of 1934, as
amended (the "EXCHANGE ACT")); (ii) its officers to execute and deliver all
customary documents and certificates and updates thereof requested by any
underwriters of the Securities and (iii) its independent public accountants to
provide to the selling Holders of the applicable Securities and any underwriter
therefor a comfort letter in customary form and covering matters of the type
customarily covered in comfort letters in connection with primary underwritten
offerings, subject to receipt of appropriate documentation as contemplated, and
only if permitted, by Statement of Auditing Standards No. 72.

            (p)   In the event that any broker dealer registered under the
Exchange Act shall underwrite any Securities or participate as a member of an
underwriting syndicate or selling group or "assist in the distribution" (within
the meaning of the Conduct Rules (the "RULES") of the National Association of
Securities Dealers, Inc. ("NASD")) thereof, whether as a Holder of such
Securities or as an underwriter, a placement or sales agent or a broker or
dealer in respect thereof, or otherwise, the Company will assist such broker
dealer in complying with the requirements of such Rules, including, without
limitation, by (i) if such Rules, including Rule 2720, shall so require,
engaging a "qualified independent underwriter" (as defined in Rule 2720) to
participate in the preparation of the Shelf Registration Statement relating to
such Securities, to exercise usual standards of due diligence in respect thereto
and, if any portion of the offering contemplated by such Registration Statement
is an underwritten offering or is made through a placement or sales agent, to
recommend the yield of such Securities, (ii) indemnifying any such qualified
independent underwriter to the extent of the indemnification of underwriters
provided in Section 4 hereof and (iii) providing such information to such broker
dealer as may be required in order for such broker dealer to comply with the
requirements of the Rules.

            (q)   The Company shall use its reasonable best efforts to take all
other steps necessary to effect the registration of the Securities covered by a
Registration Statement contemplated hereby.

      3.    Registration Expenses. (a) All expenses incident to the Company's
performance of and compliance with this Agreement will be borne by the Company,
regardless of whether a Shelf Registration Statement is ever filed or becomes
effective, including without limitation;

                  (i)   all registration and filing fees and expenses;
<PAGE>
                  (ii)  all fees and expenses of compliance with federal
            securities and state "blue sky" or securities laws;

                  (iii) all expenses of printing (including printing
            certificates for the Securities to be issued and printing of
            Prospectuses), messenger and delivery services and telephone;

                  (iv)  all fees and disbursements of counsel for the Company;

                  (v)   all application and filing fees in connection with
            listing the Securities on a national securities exchange or
            automated quotation system pursuant to the requirements hereof; and

                  (vi)  all fees and disbursements of independent certified
            public accountants of the Company (including the expenses of any
            special audit and comfort letters required by or incident to such
            performance).

The Company will bear its internal expenses (including, without limitation, all
salaries and expenses of its officers and employees performing legal or
accounting duties), the expenses of any annual audit and the fees and expenses
of any person, including special experts, retained by the Company.

            (b)   In connection with the Shelf Registration Statement required
by this Agreement, the Company will reimburse the Initial Purchasers and the
Holders of Securities covered by the Shelf Registration Statement for the
reasonable fees and disbursements of not more than one counsel designated by the
Holders of a majority in principal amount of the Securities covered by the Shelf
Registration Statement (provided that Holders of Common Stock issued upon the
conversion of the Initial Securities shall be deemed to be Holders of the
aggregate principal amount of Initial Securities from which such Common Stock
was converted) to act as counsel for the Holders in connection therewith,
provided, however, that the Company shall not be required to pay more than
$25,000 in the aggregate in respect of such fees and expenses.

      4.    Indemnification. (a) The Company agrees to indemnify and hold
harmless each Holder and each person, if any, who controls such Holder within
the meaning of the Securities Act or the Exchange Act (each Holder, and such
controlling persons are referred to collectively as the "INDEMNIFIED PARTIES")
from and against any losses, claims, damages or liabilities, joint or several,
or any actions in respect thereof (including, but not limited to, any losses,
claims, damages, liabilities or actions relating to purchases and sales of the
Securities) to which each Indemnified Party may become subject under the
Securities Act, the Exchange Act or otherwise, insofar as such losses, claims,
damages, liabilities or actions (i) arise out of or are based upon any untrue
statement or alleged untrue statement of a material fact contained in the Shelf
Registration Statement or Prospectus including any document incorporated by
reference therein, or in any amendment or supplement thereto, or in any
preliminary prospectus relating to the Shelf Registration, or (ii) arise out of,
or are based upon, the omission or alleged omission to state therein a material
fact required to be stated therein or necessary to make the statements therein
not misleading, and shall reimburse, as incurred, the Indemnified Parties for
any legal or other expenses reasonably incurred by them in connection with
investigating or defending any such loss, claim, damage, liability or action in
respect thereof; provided, however, that (i) the Company shall not be liable in
any such case to the extent that such loss, claim, damage or liability arises
out of or is based upon any untrue statement or alleged untrue statement or
omission or alleged omission made in the Shelf Registration Statement or
Prospectus or in any amendment or supplement thereto or in any preliminary
prospectus relating to the Shelf Registration in reliance upon and in conformity
with written information pertaining to such Holder and furnished to the Company
by or on behalf of such Holder specifically for inclusion therein and (ii) with
respect to any untrue statement or omission or alleged untrue statement or
omission made in any preliminary prospectus relating to the Shelf Registration,
the indemnity agreement contained in this subsection (a) shall not inure to the
benefit of any Holder from whom the person asserting any such losses, claims,
damages or liabilities purchased the Securities concerned, to the extent that a
prospectus relating to such Securities was required to be delivered by such
Holder under the Securities Act in connection with such purchase and any such
loss, claim, damage or liability of such Holder 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 Securities to such person, a copy of the final Prospectus if
the Company had previously furnished copies thereof to such Holder; provided
further, however, that this indemnity agreement will be in addition to any
liability which the Company may otherwise have to such Indemnified Party. The
Company shall also indemnify underwriters, their officers and directors and each
person who controls such underwriters within the meaning of the Securities Act
or the Exchange Act to the same extent as provided above with respect to the
indemnification of the Holders of the Securities if requested by such Holders.

            (b)   Each Holder, severally and not jointly, will indemnify and
hold harmless the Company, its officers and directors and each person, if any,
who controls the Company within the meaning of the Securities Act or the
Exchange
<PAGE>
Act from and against any losses, claims, damages or liabilities or any actions
in respect thereof, to which the Company or any such controlling person may
become subject under the Securities Act, the Exchange Act or otherwise, insofar
as such losses, claims, damages, liabilities or actions arise out of or are
based upon any untrue statement or alleged untrue statement of a material fact
contained in the Shelf Registration Statement or Prospectus or in any amendment
or supplement thereto or in any preliminary prospectus relating to the Shelf
Registration, or arise out of or are based upon the omission or alleged omission
to state therein a material fact necessary to make the statements therein not
misleading, but in each case only to the extent that the untrue statement or
omission or alleged untrue statement or omission was made in reliance upon and
in conformity with written information pertaining to such Holder and furnished
to the Company by or on behalf of such Holder specifically for inclusion
therein; and, subject to the limitation set forth immediately preceding this
clause, shall reimburse, as incurred, the Company for any legal or other
expenses reasonably incurred by the Company or any such controlling person in
connection with investigating or defending any loss, claim, damage, liability or
action in respect thereof. This indemnity agreement will be in addition to any
liability which such Holder may otherwise have to the Company or any of its
controlling persons.

            (c)   Promptly after receipt by an indemnified party under this
Section 4 of notice of the commencement of any action or proceeding (including a
governmental investigation), such indemnified party will, if a claim in respect
thereof is to be made against the indemnifying party under this Section 4,
notify the indemnifying party of the commencement thereof; but the failure to
notify the indemnifying party shall not relieve it from any liability that it
may have under subsection (a) or (b) above except to the extent that the
indemnifying party has been materially prejudiced (through the forfeiture of
substantive rights or defenses) by such failure; provided further, that the
failure to notify the indemnifying party shall not relieve it from any liability
that it may have to an 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 reasonably 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 4 for any legal or other expenses, other than reasonable costs of
investigation, subsequently incurred by such indemnified party in connection
with the defense thereof. 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 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 any indemnified party.

            (d)   If the indemnification provided for in this Section 4 is
unavailable or insufficient to hold harmless an indemnified party under
subsections (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 (or actions in respect thereof) referred to in
subsection (a) or (b) above in such proportion as is appropriate to reflect the
relative fault of the indemnifying party or parties on the one hand and the
indemnified party on the other in connection with the statements or omissions
that resulted in such losses, claims, damages or liabilities (or actions in
respect thereof) as well as any other relevant equitable considerations. The
relative fault of the parties 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 on the one hand or such Holder or such other indemnified
party, as the case may be, on the other, and the parties' relative intent,
knowledge, access to information and opportunity to correct or prevent such
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 any other provision of this Section 4(d), the Holders shall not
be required to contribute any amount in excess of the amount by which the net
proceeds received by such Holders from the sale of the Securities pursuant to
the Shelf Registration Statement exceeds the amount of damages which such
Holders have 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 Securities Act)
shall be entitled to contribution from any person who was not guilty of such
fraudulent misrepresentation. For purposes of this paragraph (d), each person,
if any, who controls such indemnified party within the meaning of the Securities
Act or the Exchange Act shall have the same rights to contribution as such
indemnified party and each person, if any, who controls the Company within the
meaning of the Securities Act or the Exchange Act shall have the same rights to
contribution as the Company.
<PAGE>
            (e)   The agreements contained in this Section 4 shall survive the
sale of the Securities pursuant to the Shelf Registration Statement and shall
remain in full force and effect, regardless of any termination or cancellation
of this Agreement or any investigation made by or on behalf of any indemnified
party.

      5.    Additional Interest Under Certain Circumstances. (a) Additional
interest (the "ADDITIONAL INTEREST") with respect to the Initial Securities
shall be assessed as follows if any of the following events occur (each such
event in clauses (i) through (iv) below being herein called a "REGISTRATION
DEFAULT"):

                  (i)   the Shelf Registration Statement has not been filed with
            the Commission by the 120th day after the latest date of original
            issuance of the Initial Securities;

                  (ii)  the Shelf Registration Statement has not been declared
            effective by the Commission by the 210th day after the latest date
            of original issuance of the Initial Securities; or

                  (iii) the Shelf Registration Statement is declared effective
            by the Commission but the Company fails, with respect to a Holder
            that supplies to the Company the questionnaire described in Section
            2(l) above and within sixty (60) days after such questionnaire was
            first sent to such Holder, to supplement the Shelf Registration
            Statement within thirty (30) days of the Company's receipt of such
            questionnaire in order to name such Holder in the Shelf Registration
            Statement; or

                  (iv)  the Shelf Registration Statement is declared effective
            by the Commission but (A) the Shelf Registration Statement
            thereafter ceases to be effective or (B) the Shelf Registration
            Statement or the Prospectus ceases to be usable in connection with
            resales of Transfer Restricted Securities (as defined below) during
            the periods specified herein because either (1) any event occurs as
            a result of which the Prospectus forming part of such Shelf
            Registration Statement would include any 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 (2) it shall be necessary to amend
            such Shelf Registration Statement or supplement the related
            prospectus, to comply with the Securities Act or the Exchange Act or
            the respective rules thereunder.

Each of the foregoing will constitute a Registration Default whatever the reason
for any such event and whether it is voluntary or involuntary or is beyond the
control of the Company or pursuant to operation of law or as a result of any
action or inaction by the Commission .

      Additional Interest shall accrue on the Initial Securities over and above
the interest set forth in the title of the Initial Securities from and including
the date on which any such Registration Default shall occur to but excluding the
date on which all such Registration Defaults have been cured, at a rate of 0.50%
per annum (the "ADDITIONAL INTEREST RATE") for the first 90-day period
immediately following the occurrence of such Registration Default. The
Additional Interest Rate shall increase by an additional 0.50% per annum with
respect to each subsequent 90-day period until all Registration Defaults have
been cured, up to a maximum Additional Interest Rate of 2.0% per annum. If a
Holder converts some or all of its Initial Securities into Common Stock at a
time when there exists a Registration Default, the Holder will not be entitled
to receive additional Additional Interest on such Common Stock, but will be
entitled to receive from the Company, in connection with such conversion,
additional shares of Common Stock equal to 3% of the applicable conversion rate
for each $1,000 original principal amount of the Initial Securities being
converted (except to the extent that the Company elects to deliver cash upon
conversion). In addition, such Holder will receive on the settlement date for
any Initial Securities submitted for conversion during a Registration Default,
accrued and unpaid Additional Interest on such Initial Securities to the
conversion date relating to such settlement date. If a Registration Default
occurs after a Holder has converted its Initial Securities into Common Stock,
such Holder will not be entitled to any Additional Interest with respect to such
Common Stock.

            (b)   A Registration Default referred to in Section 5(a)(iv) hereof
shall be deemed not to have occurred and be continuing in relation to the Shelf
Registration Statement or the related prospectus if (i) such Registration
Default has occurred solely as a result of (x) the filing of a post effective
amendment to the Shelf Registration Statement to incorporate annual audited
financial information with respect to the Company where such post effective
amendment is not yet effective and needs to be declared effective to permit
Holders to use the related prospectus or (y) other material events, with respect
to the Company that would need to be described in such Shelf Registration
Statement or the related prospectus and (ii) in the case of clause (y), the
Company is proceeding promptly and in good faith to amend or supplement the
Shelf Registration Statement and related prospectus to describe such events as
required by paragraph 2(h) hereof; provided, however, that in any case if such
Registration Default occurs for a period that exceeds 60 days in any 100-day
period or on aggregate of 100 days
<PAGE>
in any 12-month period, Additional Interest shall be payable in accordance with
the above paragraph 5(a) from the day such Registration Default occurs until
such Registration Default is cured.

            (c)   Any amounts of Additional Interest due pursuant to Section
5(a) will be payable in cash on the regular interest payment dates with respect
to the Initial Securities. The amount of Additional Interest will be determined
by multiplying the applicable Additional Interest Rate by the principal amount
of the Initial Securities, further multiplied by a fraction, the numerator of
which is the number of days such Additional Interest Rate was applicable during
such period (determined on the basis of a 360-day year comprised of twelve
30-day months), and the denominator of which is 360.

            (d)   "TRANSFER RESTRICTED SECURITIES" means each Security until (i)
the date on which such Security has been effectively registered under the
Securities Act and disposed of in accordance with the Shelf Registration
Statement or (ii) the date on which such Security is distributed to the public
pursuant to Rule 144 under the Securities Act or is saleable pursuant to Rule
144(k) under the Securities Act.

      6.    Rules 144 and 144A. The Company shall use its best efforts to file
the reports required to be filed by it under the Securities Act and the Exchange
Act in a timely manner and, if at any time the Company is not required to file
such reports, it will, upon the request of any Holder, make publicly available
other information so long as necessary to permit sales of their securities
pursuant to Rules 144 and 144A. The Company covenants that it will take such
further action as any Holder may reasonably request, all to the extent required
from time to time to enable such Holder to sell Transfer Restricted Securities
without registration under the Securities Act within the limitation of the
exemptions provided by Rules 144 and 144A (including the requirements of Rule
144A(d)(4)). The Company will provide a copy of this Agreement to prospective
purchasers of Securities identified to the Company by the Initial Purchasers
upon request. Upon the request of any Holder, the Company shall deliver to such
Holder a written statement as to whether it has complied with such requirements.
Notwithstanding the foregoing, nothing in this Section 6 shall be deemed to
require the Company to register any of its securities pursuant to the Exchange
Act.

      7.    Underwritten Registrations. If any of the Transfer Restricted
Securities covered by the Shelf Registration are to be sold in an underwritten
offering, the investment banker or investment bankers and manager or managers
that will administer the offering ("MANAGING UNDERWRITERS") will be selected by
the holders of a majority in aggregate principal amount of such Transfer
Restricted Securities to be included in such offering (provided that holders of
Common Stock issued upon conversion of the Initial Securities shall not be
deemed holders of Common Stock, but shall be deemed to be holders of the
aggregate principal amount of Initial Securities from which such Common Stock
was converted).

      No person may participate in any underwritten registration hereunder
unless such person (i) agrees to sell such person's Transfer Restricted
Securities on the basis reasonably provided in any underwriting arrangements
approved by the persons entitled hereunder to approve such arrangements and (ii)
completes and executes all questionnaires, powers of attorney, indemnities,
underwriting agreements and other documents reasonably required under the terms
of such underwriting arrangements.

      8.    Miscellaneous.

            (a)   Remedies. The Company acknowledges and agrees that any failure
by the Company to comply with its obligations under Section 1 hereof may result
in material irreparable injury to the Initial Purchasers or the Holders for
which there is no adequate remedy at law, that it will not be possible to
measure damages for such injuries precisely and that, in the event of any such
failure, the Initial Purchasers or any Holder may obtain such relief as may be
required to specifically enforce the Company's obligations under Section 1
hereof. The Company further agrees to waive the defense in any action for
specific performance that a remedy at law would be adequate.

            (b)   No Inconsistent Agreements. The Company will not on or after
the date of this Agreement enter into any agreement with respect to its
securities that is inconsistent with the rights granted to the Holders in this
Agreement or otherwise conflicts with the provisions hereof. The rights granted
to the Holders hereunder do not in any way conflict with and are not
inconsistent with the rights granted to the holders of the Company's securities
under any agreement in effect on the date hereof.

            (c)   Amendments and Waivers. The provisions of this Agreement may
not be amended, modified or supplemented, and waivers or consents to departures
from the provisions hereof may not be given, except by the Company and the
written consent of the holders of a majority in principal amount of the
Securities affected by such amendment, modification, supplement, waiver or
consents (provided that holders of Common Stock issued upon conversion of
Initial
<PAGE>
Securities shall not be deemed holders of Common Stock, but shall be deemed to
be holders of the aggregate principal amount of Initial Securities from which
such Common Stock was converted). Without the consent of the Holder of each of
the Initial Securities, however, no modification may change the provisions
relating to the payment of Additional Interest.

            (d)   Notices. All notices and other communications provided for or
permitted hereunder shall be made in writing by hand delivery, first class mail,
facsimile transmission, or air courier which guarantees overnight delivery:

                  (1)   if to a Holder of the Securities, at the most current
      address given by such Holder to the Company.

                  (2)   if to the Initial Purchasers;

                        Credit Suisse First Boston LLC
                        Eleven Madison Avenue
                        New York, NY 10010-3629
                        Fax No.:  (212) 325-8278
                        Attention:  Transactions Advisory Group
<PAGE>
      with a copy to:


                        Morrison & Foerster LLP
                        755 Page Mill Road
                        Palo Alto, California 94304
                        Attention: Justin L. Bastian

                  (3)   if to the Company, at its address as follows:


                        RadiSys Corporation
                        5445 N.E. Dawson Creek Drive
                        Hillsboro, Oregon 97124
                        Attention:  Treasurer

      with a copy to:

                        Baker & McKenzie
                        2001 Ross Avenue, Suite 2300
                        Dallas, Texas 75201
                        Attention:  Daniel W. Rabun

      All such notices and communications shall be deemed to have been duly
given: at the time delivered by hand, if personally delivered; three business
days after being deposited in the mail, postage prepaid, if mailed; when receipt
is acknowledged by recipient's facsimile machine operator, if sent by facsimile
transmission; and on the day delivered, if sent by overnight air courier
guaranteeing next day delivery.

            (e)   Third Party Beneficiaries. The Holders shall be third party
beneficiaries to the agreements made hereunder between the Company, on the one
hand, and the Initial Purchasers, on the other hand, and shall have the right to
enforce such agreements directly to the extent they may deem such enforcement
necessary or advisable to protect their rights or the rights of Holders
hereunder.

            (f)   Successors and Assigns. This Agreement shall be binding upon
the parties hereto and their respective successors and assigns.

            (g)   Counterparts. This Agreement may be executed in any number of
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

            (h)   Headings. The headings in this Agreement are for convenience
of reference only and shall not limit or otherwise affect the meaning hereof.

            (i)   Governing 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.

      By the execution and delivery of this Agreement, the Company submits to
the nonexclusive jurisdiction of any federal or state court in the State of New
York.

            (j)   Severability. If any one or more of the provisions contained
herein, or the application thereof in any circumstance, is held invalid, illegal
or unenforceable, the validity, legality and enforceability of any such
provision in every other respect and of the remaining provisions contained
herein shall not be affected or impaired thereby.

            (k)   Securities Held by the Company. Whenever the consent or
approval of Holders of a specified percentage of principal amount of Securities
is required hereunder, Securities held by the Company or its affiliates (other
than subsequent Holders of Securities if such subsequent Holders are deemed to
be affiliates solely by reason of their holdings of
<PAGE>
such Securities) shall not be counted in determining whether such consent or
approval was given by the Holders of such required percentage.
<PAGE>
      If the foregoing is in accordance with your understanding of our
agreement, please sign and return to the Company a counterpart hereof, whereupon
this instrument, along with all counterparts, will become a binding agreement
among the Initial Purchasers and the Company in accordance with its terms.

                              Very truly yours,

                              RadiSys Corporation

                              By:      /s/  Julia A. Harper
                                       -----------------------------------------
                                       Name:    Julia A. Harper
                                       Title:   Chief Financial Officer




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

CREDIT SUISSE FIRST BOSTON LLC
BANC OF AMERICA SECURITIES LLC

By:  CREDIT SUISSE FIRST BOSTON LLC


By:      /s/  John Metz
         -----------------------------------
         Name:    John Metz
         Title:   Director