X0202 4 2006-07-26 0 0000908605 CASTELLE \CA\ CSTL 0001271640 ZEFF DANIEL 50 CALIFORNIA STREET SUITE 1500 SAN FRANCISCO CA 94111 0 0 1 0 0001311997 Zeff Holding Company, LLC 50 CALIFORNIA STREET SAN FRANCISCO CA 94111 0 0 1 0 0001311996 Zeff Capital Partners I, L.P. C/O ZEFF HOLDING COMPANY, LLC 50 CALIFORNIA STREET SAN FRANCISCO CA 94111 0 0 1 0 0001313253 Spectrum Galaxy Fund Ltd. 50 CALIFORNIA STREET SUITE 1500 SAN FRANCISCO CA 94111 0 0 1 0 Common Stock 2006-07-26 4 P 0 1000 3.02 A 388227 I See footnote Common Stock 2006-07-26 4 P 0 500 3.03 A 388727 I See footnote Common Stock 2006-07-26 4 P 0 100 3.04 A 388827 I See footnote Common Stock 2006-07-26 4 P 0 6300 3.05 A 395127 I See footnote Common Stock 2006-07-26 4 P 0 500 3.06 A 395627 I See footnote Common Stock 2006-07-26 4 P 0 600 3.07 A 396227 I See footnote Common Stock 2006-07-26 4 P 0 3900 3.09 A 400127 I See footnote Common Stock 2006-07-26 4 P 0 8500 3.10 A 408627 I See footnote Common Stock 2006-07-26 4 P 0 3000 3.15 A 411627 I See footnote This Form 4 is being filed by Daniel Zeff, Spectrum Galaxy Fund Ltd. ("Spectrum"), Zeff Capital Partners I, L.P. ("Capital") and Zeff Holding Company, LLC ("Holding"). This transaction was effected through Capital. Mr. Zeff is the sole manager and member of Holding, which in turn serves as the general partner for Capital. In accordance with Instruction 4(b)(iv) of Form 4, the entire amount of the Issuer's securities held by Capital is reported herein. Each of Mr. Zeff and Holding disclaims, for purposes of Section 16 of the Securities Exchange Act of 1934, beneficial ownership of such securities, except to the extent of its/his indirect pecuniary interest therein, and this report shall not be deemed an admission that any of Mr. Zeff or Holding is the beneficial owner of such securities for purposes of Section 16 or for any other purposes. Spectrum disclaims beneficial ownership over all shares held through Capital. Daniel Zeff 2006-07-27 Daniel Zeff for Zeff Capital Partners I, L.P. 2006-07-27 Dion R. Friedland for Spectrum Galaxy Fund Ltd. 2006-07-27 Daniel Zeff for Zeff Holding Company, LLC 2006-07-27