(19)

(11)

EP 0 603 375 A1

(12)

(43) Date of publication: 29.06.1994 Bulletin 1994/26 (21) Application number: 93915471.0 (22) Date of filing: 25.06.1993

(51) International Patent Classification (IPC):  G06F 9/ 45( . ) (86) International application number: PCT/US1993/006049 (87) International publication number: WO 1994/000813 (06.01.1994 Gazette 1994/02)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 26.06.1992 US 19920905930 26.06.1992 US 19920904816 26.06.1992 US 19920906212 26.06.1992 US 19920905929 (60) Divisional application: 98200627.2 / 0856788 (60) Divisional application: 98200628.0 / 0856789 (71) Applicant: DIGITAL EQUIPMENT CORPORATION Maynard, MA 01754 (US)	(72) Inventor: BRETT, Bevin, R. Merrimack, NH 03054 (US) (74) Representative: Hale, Peter, et al  Kilburn & Strode 30 John Street London WC1N 2DD London WC1N 2DD (GB)