Walter A Kowalski

US Patent:

40190900, Apr 19, 1977

Filed:

Dec 5, 1975

Appl. No.:

5/638123

Inventors:

David Allen Wolff - Schaumburg IL
Walter Kowalski - Franklin Park IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01J 2970

US Classification:

315 85

Abstract:

Circuitry utilizing either composite sync or separated sync data provides self-stepping capability for the vertical scan of a CRT alphanumeric display. A counter counts horizontal sync pulses for varying the vertical scan rate between rows of characters in steps, and is synchronized with the beginning of each frame by the vertical sync pulse. Alphanumeric data can be displayed with any desired spacing between rows without change of character format and with minimum effect on the size of the displayed characters.