Exhibit 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D and any amendments...

                                                                       Exhibit 1


                             JOINT FILING AGREEMENT


      In accordance with Rule 13d-1(k)(1)  under the Securities  Exchange Act of
1934, as amended, the persons named below agree to the joint filing on behalf of
each  of them of a  Statement  on  Schedule  13D and any  amendments  to it with
respect to the Common Shares, no par value, of Catalyst Semiconductor,  Inc. and
further  agree that this Joint  Filing  Agreement  be  included as an Exhibit to
those joint filings.


Dated:  June 22, 2007



                              J. & ▇. ▇▇▇▇▇▇▇▇ & CO. INCORPORATED



                              By /s/ ▇▇▇▇▇▇ ▇. ▇▇▇▇
                                -----------------------------
                              Name:  ▇▇▇▇▇▇ ▇. ▇▇▇▇
                              Title: CFO



                              ▇▇▇▇▇▇▇▇ SPECTRUM FOCUS (MASTER) FUND



                              By /s/ ▇▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇
                                -----------------------------
                              Name:  ▇▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇
                              Title:  Authorized Person


                              ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇
                                      By ▇▇▇▇▇ ▇. ▇▇▇▇▇,
                                      as attorney-in-fact for ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇

                              /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇
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