UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                          FORM 10-K/A (Amendment No.1)

(Mark One)
   (X)  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
        ACT OF 1934 For thefiscal year ended December 31, 2004 or

   ( )  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
        EXCHANGE ACT OF 1934 For the period from ___________ to _____________

                           Commission File No. 0-10394

                              DATA I/O CORPORATION
             (Exact name of registrant as specified in its charter)


        Washington                                        91-0864123
(State or other Incorporation)           (I.R.S. Employer Identification Number)



     P.O. Box 97046, 10525 Willows Road N.E.,Redmond, Washington 98073-9746
                                 (425) 881-6444
  (Address, including zip code, of registrant's principle executive offices and
                     telephone number, including area code)


           Securities registered pursuant to Section 12(b) of the Act:

                                      NONE

           Securities registered pursuant to Section 12(g) of the Act:

                           Common Stock (No Par Value)
                  Series A Junior Participating Preferred Stock

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days. Yes X No

Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K is not contained  herein,  and will not be contained,  to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [ ]

Indicate  by check mark  whether  the  registrant  is an  accelerated  filer (as
defined in Rule 12b-2 of the Act). Yes __ No X
                                                                                

                Aggregate market value of voting and non-voting
                   Common Stock held by non-affiliates of the
                         registrant as of June 30, 2004

                                  $ 22,516,524


8,199,678 shares of Common Stock, no par value, outstanding as of March 21, 2005









                                                            
                              DATA I/O CORPORATION

                                   FORM 10-K/A
                   For the Fiscal Year Ended December 31, 2004
                                      INDEX


                                                                            Page


Part IV

     Item 15.   Exhibits and Financial Statement Schedules                     4


Signatures                                                                     7










                                EXPLANATORY NOTE

The certifications under section 906 of the Sarbanes-Oxley Act of 2002, filed as
Exhibits 32.1 and 32.2, respectively,  to the Annual Report on Form 10-K for the
year ended December 31, 2004 contained a typographical error. The certifications
referenced  the annual  report for the year ended  December  31, 2003 instead of
December  31,  2004 and such  certifications  are being  refiled to correct  the
typographical error.








                                     PART IV

Item 15.  Exhibits and Financial Statement Schedules

Executive Compensation Plans and Arrangements

The  following  list is a subset  of the list of  exhibits  described  below and
contains all compensatory plans, contracts or arrangements in which any director
or  executive  officer  of Data  I/O is a  participant,  unless  the  method  of
allocation of benefits  thereunder is the same for management and non-management
participants:

(1) Amended and Restated 1982 Employee Stock Purchase Plan.  See Exhibit 10.18.

(2) Amended and Restated Retirement Plan and Trust Agreement.  See Exhibit 10.2,
    10.3, 10.4, 10.8, 10.11, 10.12, and 10.13.

(3) Summary of Amended and Restated Management Incentive Compensation Plan. See
    Exhibit 10.9.

(4) Amended and Restated 1983 Stock Appreciation Rights Plan.  See Exhibit 10.1.

(5) Amended and Restated 1986 Stock Option Plan.  See Exhibit 10.15.

(6) Form of Change in Control Agreements.  See Exhibit 10.22 and 10.23.

(7) 1996 Director Fee Plan. See Exhibit 10.14.

(8) Letter Agreement with Frederick R. Hume. See Exhibit 10.17.

(9) Amended and Restated 2000 Stock Compensation Incentive Plan. 
    See Exhibit 10.19.

(10) Form of Option Agreement. See Exhibit 10.21.

(11) Data I/O Corporation Tax Deferral Retirement Plan. See Exhibit 10.20.


(a) List of Documents Filed as a Part of This Report:                       Page

     (1)  Index to Financial Statements:

               Report of Independent Registered Public Accounting Firm

               Report of Management

               Consolidated Balance Sheets as of December 31, 2004 and 2003

               Consolidated Statements of Operations for each of the three 
               years ended December 31, 2004

               Consolidated Statements of Cash Flows for each of the three 
               years ended December 31, 2004

               Consolidated Statement of Stockholders' Equity for each of 
               the three years ended December 31, 2004

               Notes to Consolidated Financial Statements


      (2) Index to Financial Statement Schedules:

               Schedule II - Consolidated Valuation and Qualifying Accounts

          All other schedules not listed above have been omitted because the
          required information is included in the consolidated financial
          statements or the notes thereto, or is not applicable or required.

     (3)  Index to Exhibits:

          3    Articles of Incorporation:

               3.1    Data I/O's restated Articles of Incorporation filed 
                      November 2, 1987 (Incorporated by reference to Exhibit 3.1
                      of Data I/O's 1987 Annual Report on Form 10-K (File No.
                      0-10394)).

               3.2    Data I/O's Bylaws as amended and restated as of October 
                      2003 (Incorporated by reference to Data I/O's 2003 Annual
                      Report on Form 10-K (File No. 0-10394)).

               3.3    Certification of Designation, Preferences and Rights of
                      Series A Junior Participating Preferred Stock
                      (Incorporated by reference to Exhibit 1 of Data I/O's
                      Registration Statement on Form 8-A filed March 13, 1998
                      (File No. 0-10394)).

          4    Instruments Defining the Rights of Security Holders, Including
               Indentures:

               4.1    Rights Agreement, dated as of April 4, 1998, between Data
                      I/O Corporation and ChaseMellon Shareholder Services,
                      L.L.C. as Rights Agent, which includes: as Exhibit A
                      thereto, the Form of Right Certificate; and, as Exhibit B
                      thereto, the Summary of Rights to Purchase Series A Junior
                      Participating Preferred Stock (Incorporated by reference
                      to Data I/O's Current Report on Form 8-K filed on March
                      13, 1998).

               4.2    Rights Agreement, dated as of March 31, 1988, between Data
                      I/O Corporation and First Jersey National Bank, as Rights
                      Agent, as amended by Amendment No. 1 thereto, dated as of
                      May 28, 1992 and Amendment No. 2 thereto, dated as of July
                      16, 1997 (Incorporated by reference to Data I/O's Report
                      on Form 8-K filed on March 13, 1998).

               4.3    Amendment No. 1, dated as of February 10, 1999, to Rights
                      Agreement, dated as of April 4, 1998, between Data I/O
                      Corporation and ChaseMellon Shareholder Services, L.L.C.
                      as Rights Agent (Incorporated by reference to Exhibit 4.1
                      of Data I/O's Form 8-A/A dated February 10, 1999).

          10   Material Contracts:

               10.1   Amended and Restated 1983 Stock Appreciation Rights Plan
                      dated February 3, 1993 (Incorporated by reference to
                      Exhibit 10.23 of Data I/O's 1992 Annual Report on 
                      Form 10-K (File No. 0-10394)).

               10.2   Amended and Restated Retirement Plan and Trust Agreement
                      (Incorporated by reference to Exhibit 10.26 of Data
                      I/O's 1993 Annual Report on Form 10-K (File No. 0-10394)).

               10.3   First Amendment to the Data I/O Tax Deferred Retirement 
                      Plan (Incorporated by reference to Exhibit 10.21 of Data
                      I/O's 1994 Annual Report on Form 10-K (File No. 0-10394)).

               10.4   Second Amendment to the Data I/O Tax Deferred Retirement 
                      Plan (Incorporated by reference to Exhibit 10.26 of
                      Data I/O's 1995 Annual Report on Form 10-K
                      (File No. 0-10394)).

               10.5   Purchase and Sale Agreement dated as of July 9, 1996
                      (Relating to the sale of Data I/O Corporation's
                      headquarters property in Redmond, Washington consisting of
                      approximately 79 acres of land and an approximately 96,000
                      square foot building. (Portions of this exhibit have been
                      omitted pursuant to an application for an order granting
                      confidential treatment. The omitted portions have been
                      separately filed with the Commission) (Incorporated by
                      reference to Exhibit 10.32 of Data I/O's 1996 Annual
                      Report on Form 10-K (File No. 0-10394)).

               10.6   Letter dated as of December 20, 1996, First Amendment and
                      extension of the Closing Date under that certain Purchase
                      and Sale Agreement dated as of July 9, 1996 (Portions of
                      this exhibit have been omitted pursuant to an application
                      for an order granting confidential treatment. The omitted
                      portions have been separately filed with the Commission)
                      (Incorporated by reference to Exhibit 10.33 of Data I/O's
                      1996 Annual Report on Form 10-K (File No. 0-10394)).

               10.7   Letter dated as of February 17, 1997, Second Amendment and
                      extension of the Closing Date under that certain Purchase
                      and Sale Agreement dated as of July 9, 1996 (Portions of
                      this exhibit have been omitted pursuant to an application
                      for an order granting confidential treatment. The omitted
                      portions have been separately filed with the Commission)
                      (Incorporated by reference to Exhibit 10.34 of Data I/O's
                      1996 Annual Report on Form 10-K (File No. 0-10394)).

               10.8   Third Amendment to the Data I/O Tax Deferred Retirement
                      Plan (Incorporated by reference to Exhibit 10.35 of Data
                      I/O's 1996 Annual Report on Form 10-K (File No. 0-10394)).

               10.9   Amended and Restated Management Incentive Compensation
                      Plan dated January 1, 1997 (Incorporated by reference to
                      Exhibit 10.25 of Data I/O's 1997 Annual Report on Form
                      10-K (File No. 0-10394)).

               10.10  Amended and Restated Performance Bonus Plan dated January
                      1, 1997 (Incorporated by reference to Exhibit 10.26 of
                      Data I/O's 1997 Annual Report on Form 10-K (File No.
                      0-10394)).

               10.11  Fourth Amendment to the Data I/O Tax Deferred Retirement
                      Plan (Incorporated by reference to Exhibit 10.27 of Data
                      I/O's 1997 Annual Report on Form 10-K (File No. 0-10394)).

               10.12  Fifth Amendment to the Data I/O Tax Deferred Retirement
                      Plan (Incorporated by reference to Exhibit 10.28 of Data
                      I/O's 1997 Annual Report on Form 10-K (File No. 0-10394)).

               10.13  Sixth Amendment to the Data I/O Tax Deferred Retirement
                      Plan (Incorporated by reference to Exhibit 10.29 of Data
                      I/O's 1997 Annual Report on Form 10-K (File No. 0-10394)).

               10.14  Amended and Restated Data I/O Corporation 1996 Director
                      Fee Plan (Incorporated by reference to Exhibit 10.32 of
                      Data I/O's 1997 Annual Report on Form 10-K (File No.
                      0-10394)).

               10.15  Amended and Restated 1986 Stock Option Plan dated May 12,
                      1998 (Incorporated by reference to Exhibit 10.37 of Data
                      I/O's 1998 Annual Report on Form 10-K (File No. 0-10394)).

               10.16  Sublease dated December 22, 1999 between Data I/O
                      Corporation and Imandi.com, Inc. (Incoporated by reference
                      to Exhibit 10.34 of Data I/O's 1999 Annual Report on Form
                      10-K (File No. 0-10394)).

               10.17  Letter Agreement with Fred R. Hume dated January 29, 1999
                      (Incorporated by reference to Exhibit 10.33 of Data I/O's
                      1999 Annual Report on Form 10-K (File No. 0-10394)).

               10.18  Amended and Restated 1982 Employee Stock Purchase Plan
                      dated May 16, 2003 (Incorporated by reference to
                      Data I/O's 2003 Proxy Statement dated March 31, 2003).

               10.19 Amended and Restated 2000 Stock Compensation Incentive Plan
                     dated May 20, 2004 (Incorporated by reference to Data I/O's
                     2004 Proxy Statement dated April 12, 2004).

               10.20 Data I/O Corporation Tax Deferral Retirement Plan, as
                     amended (Incorporated by reference to Exhibit 10.20 of Data
                     I/O's 2004 Annual Report on Form 10-K (File No. 0-10394)).

               10.21 Form of Option Agreement (Incorporated by reference to
                     Exhibit 10.21 of Data I/O's 2004 Annual Report on Form 10-K
                     (File No. 0-10394)).

               10.22  Change in Control Agreement with Fred R. Hume dated
                      April 22, 2004 (Incorporated by reference to Exhibit 10.22
                      of Data I/O's 2004 Annual Report on Form 10-K
                      (File No. 0-10394)).

               10.23  Change in Control Agreement with Joel S. Hatlen dated
                      April 22, 2004 (Incorporated by reference to Exhibit 10.23
                      of Data I/O's 2004 Annual Report on Form 10-K (File No.
                      0-10394)).

               21.1   Subsidiaries of the Registrant

               23.1   Consent of Independent Registered Public Accounting Firm

          31   Certification - Section 302:

               31.1   Chief Executive Officer Certification                    8
               31.2   Chief Financial Officer Certification                    9

          32   Certification - Section 906:

               32.1   Chief Executive Officer Certification                   10
               32.2   Chief Financial Officer Certification                   11







SIGNATURES

Pursuant to the  requirements of Section 13 or 15(d) of the Securities  Exchange
Act of 1934,  the  Registrant  has duly  caused  this report to be signed on its
behalf by the undersigned, thereunto duly authorized.

                                      DATA I/O CORPORATION
                                           (REGISTRANT)

DATED:   June 16, 2005                By: //S//Frederick R. Hume 
                                      Frederick R. Hume
                                      President and Chief Executive Officer












Exhibit 31.1
Certification by Chief Executive Officer
Pursuant to 18 U.S.C. Section 1350
As Adopted Pursuant to
Section 302(a) of the Sarbanes-Oxley Act of 2002

I, Frederick R. Hume, certify that:
1)   I have reviewed this annual report on Form 10-K/A of Data I/O Corporation;
2)   Based upon my  knowledge,  this  annual  report does not contain any untrue
     statement of material  fact or omit to state a material  fact  necessary to
     make the statements  made, in light of the  circumstances  under which such
     statements  were made, not misleading with respect to the period covered by
     this annual report;
3)   Based on my  knowledge,  the  financial  statements,  and  other  financial
     information included in this annual report,  fairly present in all material
     respects the financial  condition,  results of operations and cash flows of
     the registrant as of, and for, the periods presented in this annual report;
4)   The  registrant's  other  certifying  officer  and  I are  responsible  for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:
     a) designed such disclosure controls and procedures, or caused such
        disclosure controls and procedures to be designed under our supervision,
        to ensure that material information relating to the registrant, 
        including its consolidated subsidiaries, is made known to us by others
        within those entities, particularly during the period in which this
        annual report is being prepared;
     b) evaluated the effectiveness of the registrant's disclosure controls and
        procedures and presented in this annual report our conclusions about
        the effectiveness of the disclosure controls and procedures, as of the
        end of the period covered by this annual report based on such
        evaluation; and
     c) disclosed in this annual report any change in the registrant's internal
        control over financial reporting that occurred during the registrant's
        most recent fiscal quarter (the registrant's fourth fiscal quarter in
        the case of an annual report) that has materially affected or is
        reasonably likely to materially affect, the registrant's internal
        control over financial reporting.
5)   The registrant's other certifying  officer and I have disclosed, based on
     our most recent evaluation of internal control over financial reporting, 
     to the registrant's  auditors and the audit committee of  registrant's 
     board  of  directors  (or  persons performing the equivalent functions):
     a) all significant deficiencies and material weaknesses in the design or
        operation of internal control over financial reporting which are
        reasonably likely to adversely affect the registrant's ability to
        record, process, summarize and report financial information; and
     b) any fraud, whether or not material, that involves management or other
        employees who have a significant role in the registrant's internal
        controls over financial reporting.

Date: June 16, 2005

/s/ Frederick R. Hume
Frederick R. Hume
Chief Executive Officer
(Principal Executive Officer)





Exhibit 31.2
Certification by Chief Financial Officer
Pursuant to 18 U.S.C. Section 1350
As Adopted Pursuant to
Section 302(a) of the Sarbanes-Oxley Act of 2002

I, Joel S. Hatlen, certify that:
1)   I have reviewed this annual report on Form 10-K/A of Data I/O Corporation;
2)   Based upon my  knowledge,  this  annual  report does not contain any untrue
     statement of material  fact or omit to state a material  fact  necessary to
     make the statements  made, in light of the  circumstances  under which such
     statements  were made, not misleading with respect to the period covered by
     this annual report;
3)   Based on my  knowledge,  the  financial  statements,  and  other  financial
     information included in this annual report,  fairly present in all material
     respects the financial  condition,  results of operations and cash flows of
     the registrant as of, and for, the periods presented in this annual report;
4)   The  registrant's  other  certifying  officer  and  I are  responsible  for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:
     a) designed such disclosure controls and procedures, or caused such
        disclosure controls and procedures to be designed under our supervision,
        to ensure that material information relating to the registrant,
        including its consolidated subsidiaries, is made known to us by others
        within those entities, particularly during the period in which this
        annual report is being prepared;
     b) evaluated the effectiveness of the registrant's disclosure controls and
        procedures and presented in this annual report our conclusions about
        the effectiveness of the disclosure controls and procedures, as of the
        end of the period covered by this annual report based on such 
        evaluation; and
     c) disclosed in this annual report any change in the registrant's internal
        control over financial reporting that occurred during the registrant's
        most recent fiscal quarter (the registrant's fourth fiscal quarter in
        the case of an annual report) that has materially affected or is
        reasonably likely to materially affect, the registrant's internal
        control over financial reporting.
5)   The registrant's other certifying  officer and I have disclosed,  based on
     our most recent evaluation of internal control over financial reporting, to
     the registrant's  auditors and the audit committee of registrant's board of
     directors (or persons performing the equivalent functions):
     a) all significant deficiencies and material weaknesses in the design or
        operation of internal control over financial reporting which are
        reasonably likely to adversely affect the registrant's ability to
        record, process, summarize and report financial information; and
     b) any fraud, whether or not material, that involves management or other
        employees who have a significant role in the registrant's internal
        controls over financial reporting.

Date: June 16, 2005

/s/ Joel S. Hatlen
Joel S. Hatlen
Chief Financial Officer
(Principal Financial Officer)






Exhibit 32.1

Certification by Chief Executive Officer
Pursuant to 18 U.S.C. Section 1350
As Adopted Pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the annual report of Data I/O Corporation  (the "Company") on
Form 10-K for the period ended  December  31, 2004 as filed with the  Securities
and Exchange Commission on the date hereof (the "Report"), I, Frederick R. Hume,
Chief  Executive  Officer of the Company,  certify,  that  pursuant to 18 U.S.C.
Section 1350, as adopted  pursuant to Section 906 of the  Sarbanes-Oxley  Act of
2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d)
    of the Securities Exchange Act of 1934; and
(2) The information contained in the Report fairly presents, in all material
    respects, the financial condition and results of operations of the Company.


/s/ Frederick R. Hume
Frederick R. Hume
Chief Executive Officer
(Principal Executive Officer)
March 25, 2005







Exhibit 32.2

Certification by Chief Financial Officer
Pursuant to 18 U.S.C. Section 1350
As Adopted Pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the annual report of Data I/O Corporation  (the "Company") on
Form 10-K for the period ended  December  31, 2004 as filed with the  Securities
and Exchange  Commission on the date hereof (the  "Report"),  I, Joel S. Hatlen,
Chief  Financial  Officer of the Company,  certify,  that  pursuant to 18 U.S.C.
Section 1350, as adopted  pursuant to Section 906 of the  Sarbanes-Oxley  Act of
2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of
    the Securities Exchange Act of 1934; and
(2) The  information  contained in the Report fairly  presents,  in all material
    respects, the financial condition and results of operations of the Company.


/s/ Joel S. Hatlen
Joel S. Hatlen
Chief Financial Officer
(Principal Financial Officer)
March 25, 2005