(19)

(11)

EP 0 090 804 A1

(12)

(43) Date of publication: 12.10.1983 Bulletin 1983/41 (21) Application number: 81903022.0 (22) Date of filing: 13.10.1981

(51) International Patent Classification (IPC):  G06F 3/ 00( . ) G06F 11/ 34( . ) (86) International application number: PCT/US1981/001373 (87) International publication number: WO 1983/001524 (28.04.1983 Gazette 1983/10)

(84) Designated Contracting States: CH DE FR GB LI NL SE (71) Applicant: IBM INTERNATIONAL BUSINES MACHINES CORPORATION Poughkeepsie, NY 12602 (US)

(72) Inventors: CORMIER, Roger Louis Pleasant Valley, NY 12569 (US) DUGAN, Robert James Hyde Park, NY 12538 (US) GUYETTE, Richard Roland Hopewell Junction, NY 12533 (US) HANKISON, ROnald Lee Poughkeepsie, NY 12603 (US) HAO, Ming C. Chappaqua, NY 10514 (US) LEVIN, Arthur Louis Pleasant Valley, NY 12569 (US) McCLAIN, George Albert Delray Beach FL 33444 (US) WANISH, Paul John Poughkeepsie, NY 12601 (US) ZEITLER, Carl, Jr. Poughkeepsie, NY 12603 (US) (74) Representative: Barth, Carl Otto, et al  IBM Corporation Säumerstrasse 4 CH-8803 Rüschlikon CH-8803 Rüschlikon (CH)