(19)

(11)

EP 0 029 834 A1

(12)

(43) Date of publication: 10.06.1981 Bulletin 1981/23 (21) Application number: 80900984.0 (22) Date of filing: 02.06.1980

(51) International Patent Classification (IPC):  G06F 7/ 78( . ) (86) International application number: PCT/GB1980/000096 (87) International publication number: WO 1980/002755 (11.12.1980 Gazette 1980/28)

(84) Designated Contracting States: DE FR GB NL (30) Priority: 05.06.1979 GB 19790019511 (71) Applicant: BURROUGHS CORPORATION (a Michigan corporation) Detroit, Michigan 48232 (US)	(72) Inventor: RITCHIE, Kenneth George William Edinburgh (GB)