(19)

(11)

EP 0 473 695 A1

(12)

(43) Date of publication: 11.03.1992 Bulletin 1992/11 (21) Application number: 90908815.0 (22) Date of filing: 17.05.1990

(51) International Patent Classification (IPC):  G11B 7/ 0045( . ) G11B 7/ 24( . ) G11B 7/ 245( . ) G11B 7/ 0055( . ) G11B 7/ 244( . ) G11B 7/ 258( . ) (86) International application number: PCT/US1990/002827 (87) International publication number: WO 1990/014657 (29.11.1990 Gazette 1990/27)

(84) Designated Contracting States: DE FR GB IT NL (30) Priority: 25.05.1989 US 19890357377 28.09.1989 US 19890414041 28.09.1989 US 19890414044 30.04.1990 US 19900516509 (71) Applicant: TANDY CORPORATION Fort Worth Texas 76102 (US)	(72) Inventors: CLARK, Bryan, K. Sunnyvale, CA 94086 (US) JOHNSON, Sheryl, L. Sunnyvale, CA 94086 (US) GUERRA, Robert Santa Clara, CA 95050 (US) (74) Representative: Tomlinson, Kerry John, et al  Frank B. Dehn & Co. European Patent Attorneys Imperial House 15-19 Kingsway London WC2B 6UZ London WC2B 6UZ (GB)