(19)

(11)

EP 0 591 405 A1

(12)

(43) Date of publication: 13.04.1994 Bulletin 1994/15 (21) Application number: 92914447.0 (22) Date of filing: 19.06.1992

(51) International Patent Classification (IPC):  G06F 13/ 36( . ) G06F 15/ 16( . ) G06F 12/ 08( . ) G06F 13/ 12( . ) G06F 15/ 173( . ) (86) International application number: PCT/US1992/005079 (87) International publication number: WO 1993/000639 (07.01.1993 Gazette 1993/02)

(84) Designated Contracting States: DE FR GB (30) Priority: 20.06.1991 US 19910718899 20.06.1991 US 19910718900 (71) Applicant: UNISYS CORPORATION Blue Bell, PA 19424 (US)

(72) Inventors: HO, Kin, M. Milpitas, CA 95035 (US) KURPANEK, Dietmar, M. San Jose, CA 95126 (US) LI, Adam, W., K. San Jose, CA 95123 (US) LIU, Jonathan, W. Mountain View, CA 94040 (US) SASSONE, Brian, J. Los Gatos, CA 95032 (US) SHEIKH, Tahir, Q. Fremont, CA 94538 (US) TAM, Sam Belmont, CA 94002 (US) (74) Representative: Modiano, Guido, Dr.-Ing., et al  Modiano, Josif, Pisanty & Staub, Baaderstrasse 3 D-80469 München D-80469 München (DE)