Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION
                     906 OF THE SARBANES-OXLEY ACT OF 2002

I, Robert A. Kleist, hereby certify that this periodic report containing
financial statements fully complies with the requirements of Section 13(a) or
15(d) of the Securities Exchange Act of 1934 and that the information contained
in the periodic report fairly presents in all material respects, the financial
condition and results of operations of Printronix, Inc.

June 23, 2004

/s/ ROBERT A. KLEIST
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Robert A. Kleist
President and Chief Executive Officer