(19)

(11)

EP 0 231 240 A1

(12)

(43) Date of publication: 12.08.1987 Bulletin 1987/33 (21) Application number: 86904306.0 (22) Date of filing: 18.07.1986

(51) International Patent Classification (IPC):  G06F 3/ 14( . ) G09G 1/ 16( . ) G06F 13/ 374( . ) (86) International application number: PCT/GB1986/000422 (87) International publication number: WO 1987/000658 (29.01.1987 Gazette 1987/03)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 18.07.1985 GB 19850018130 (71) Applicant: ANAMARTIC LIMITED Milton Cambridge CB4 4AE (GB)	(72) Inventor: WESTMORE, Richard Milton Hall Milton Cambridge CB4 4AE (GB)