1 AGREEMENT TO FILE JOINT SCHEDULE 13D

   1
                                AGREEMENT TO FILE
                               JOINT SCHEDULE 13D

         Each of the undersigned, being a record owner or "beneficial owner" of
the common stock of Power-One, Inc. ("Common Stock"), xxxxxx agrees to jointly
file a Schedule 13D with respect to their respective holdings of the Common
Stock and to include this agreement as an exhibit to such Schedule 13D.

         IN WITNESS WHEREOF, each of the undersigned has executed and delivered
this agreement as of the 8th day of June, 1998.

                                     XXXXXXXX GROUP, INC.


                                     By:      /s/ Xxxxxxx X. Xxxxxxxx
                                         ---------------------------------
                                         Xxxxxxx X. Xxxxxxxx
                                         Chairman of the Board of Directors


                                     XXXXXXX X. XXXXXXXX TRUST NO. ONE


                                     By:      /s/ Xxxxxxx X. Xxxxxxxx
                                         ---------------------------------
                                         Xxxxxxx X. Xxxxxxxx, Trustee


                                     By:      /s/ Xxxxxx X. Xxxxxxxx
                                         ---------------------------------
                                         Xxxxxx X. Xxxxxxxx, Trustee


   2

                                     XXXX X. XXXXXXXX TRUST


                                     By:      /s/ Xxxx X. Xxxxxxxx
                                         ---------------------------------
                                          Xxxx X. Xxxxxxxx, Trustee


                                     By:      /s/ Xxxxxxx X. Xxxxxxxx
                                         ---------------------------------
                                          Xxxxxxx X. Xxxxxxxx, Trustee


                                     By:      /s/ Xxxxxx X. Xxxx
                                         ---------------------------------
                                          Xxxxxx X. Xxxx, Trustee


                                     XXXXXX X. XXXXXXXX TRUST


                                     By:      /s/ Xxxxxx X. Xxxxxxxx
                                         ---------------------------------
                                          Xxxxxx X. Xxxxxxxx, Trustee


                                     XXXXXX & XXXXXXX XXXXXXXX CHILDREN'S TRUST


                                     By:      /s/ Xxx X.X. Xxxxxx
                                         ---------------------------------
                                          Xxx X.X. Xxxxxx, Trustee


                                     XXXXXXX XXXXXXX XXXXXXXX TRUST


                                     By:      /s/ Xxxxxxx X. Xxxxxxxx
                                         ---------------------------------
                                          Xxxxxxx X. Xxxxxxxx, Trustee


                                     XXXXXXXXX XXX XXXXXXXX XXXXXXXX REVOCABLE 
                                     TRUST


                                     By:    /s/ Xxxxxxxxx Xxxxxxxx Xxxxxxxx
                                         -----------------------------------
                                         Xxxxxxxxx Xxxxxxxx Xxxxxxxx, Trustee


   3

                                     X. X. XXXXXXXX, XX. REVOCABLE TRUST


                                     By:      /s/ Xxxxxx X. Xxxxxxxx, Xx.
                                         ---------------------------------
                                         Xxxxxx X. Xxxxxxxx, Xx., Trustee


                                     XXXXXXX X. XXXXXXXX GRANDCHILDRENS TRUST 
                                     AAAA


                                     By:      /s/  Xxx X.X. Xxxxxx
                                         ---------------------------------
                                         Xxx X.X. Xxxxxx, Trustee


                                     XXXXXX XXXXX XXXXXXXX TRUST ONE


                                     By:      /s/ Xxxx X. Xxxxxxxx
                                         ---------------------------------
                                         Xxxx X. Xxxxxxxx, Trustee


                                     By:      /s/  Xxxxxxxxx Xxxxxxxx Xxxxxxxx
                                         ------------------------------------
                                         Xxxxxxxxx Xxxxxxxx Xxxxxxxx, Trustee


                                     By:     /s/  Xxxxxx X. Xxxxxxxx, Xx.
                                         ---------------------------------
                                         Xxxxxx X. Xxxxxxxx, Xx., Trustee


                                     By:     /s/  Xxxxxx Xxxxx Xxxxxxxx
                                         ---------------------------------
                                             Xxxxxx Xxxxx Xxxxxxxx, Trustee


   4
                                     XXXXXX XXXXX XXXXXXX XXXXXXXX TRUST


                                     By:      /s/  Xxxxxx X. Xxxxxxxx
                                         ---------------------------------
                                          Xxxxxx X. Xxxxxxxx, Trustee

                                     XXXX XXXXXXX XXXXXXXX TRUST


                                     By:      /s/  Xxxxxx X. Xxxxxxxx
                                         ---------------------------------
                                          Xxxxxx X. Xxxxxxxx, Trustee


                                     XXXXX XXXXXXXX XXXXXXXX TRUST


                                     By:      /s/  Xxxxxx X. Xxxxxxxx
                                         ---------------------------------
                                          Xxxxxx X. Xxxxxxxx, Trustee

                                     J&J PARTNERS


                                     By:      /s/  Xxx X.X. Xxxxxx
                                         ---------------------------------
                                          Xxx X.X. Xxxxxx


                                     XXXXXX ENTERPRISES, INC.


                                     By:      /s/ Xxx X.X. Xxxxxx
                                         ---------------------------------
                                          Xxx X.X. Xxxxxx, President


                                     CORAL TWO CORPORATION


                                     By:      /s/  Xxx X.X. Xxxxxx
                                         ---------------------------------
                                          Xxx X.X. Xxxxxx, President

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                                     CORAL PARTNERS


                                     By:      /s/  Xxxxxx X. Xxxxxxxx
                                         ---------------------------------
                                          Xxxxxx X. Xxxxxxxx


                                     By:      /s/  Xxx X.X. Xxxxxx
                                         ---------------------------------
                                          Xxx X.X. Xxxxxx


                                     XXXXXXXX ENTERPRISES


                                     By:      /s/  Xxxxxx X. Xxxxxxxx, Xx.
                                         ---------------------------------
                                          Xxxxxx X. Xxxxxxxx, Xx.


                                              /s/  Xxxxxxx X. Xxxxxx
                                         ---------------------------------
                                              Xxxxxxx X. Xxxxxx


                                              /s/  Xxxxxx X. Xxxxxxxx, Xx.
                                         ---------------------------------
                                              Xxxxxx X. Xxxxxxxx, Xx.


                                              /s/ Xxxxxxx X. Xxxxxxxx
                                         ---------------------------------
                                          Xxxxxxx X. Xxxxxxxx


                                     By:      /s/  Xxxxxx X. Xxxxxxxx
                                         ---------------------------------
                                          Xxxxxx X. Xxxxxxxx


                                     By:      /s/  Xxxx X. Xxxxxxxx
                                         ---------------------------------
                                          Xxxx X. Xxxxxxxx


                                              /s/ Xxxxxx X. Xxxx
                                         ---------------------------------
                                              Xxxxxx X. Xxxx

   6


                                              /s/ Xxx X.X. Xxxxxx
                                         ---------------------------------
                                              Xxx X.X. Xxxxxx


                                              /s/ Xxxxxxx X. Xxxxxxxx
                                         ---------------------------------
                                              Xxxxxxx X. Xxxxxxxx


                                              /s/ Xxxxxxxxx Xxxxxxxx Xxxxxxxx
                                         -------------------------------------
                                              Xxxxxxxxx Xxxxxxxx Xxxxxxxx


                                              /s/ Xxxxxx X. Xxxxxxxx, Xx.
                                         ---------------------------------
                                              Xxxxxx X. Xxxxxxxx, Xx.


                                              /s/ Xxxxxx Xxxxx Xxxxxxxx
                                         ---------------------------------
                                              Xxxxxx Xxxxx Xxxxxxxx


                                              /s/ Xxxxx Xxxxxxx
                                      -----------------------------------------
                                      Xxxxx Xxxxxxx, trustee pursuant to Voting 
                                      Trust Agreement dated as of June 1, 1998