公开(公告)号：CA1169578A

公开(公告)日：1984-06-19

申请号：CA385548

申请日：1981-09-09

Applicant: IBM

Inventor： CASON WILLIAM C ,  KUECKER WARD A ,  LAPLANT SUSAN D

IPC: G06F3/02 ,  G06F17/21 ,  G09G5/08 ,  G06F3/153 ,  G06F3/023 ,  G06F3/03

Abstract: MULTI-DIRECTIONAL CURSOR MOTION Operator keystrokes are processed in a text processor system to move a cursor on a display screen in either a vertical or horizontal direction or both without limitation as to the location of text. keystroke data is processed under the control of programs stored in a random access memory. For a cursor motion, the random access memory of the system is structured to include a text storage buffer and a display control block both interconnected to an applications program and a display access method program. Data is stored in the text storage buffer in an unformatted configuration and the programs equate a contextual cursor address with a spatial cursor position. After running the display access method program in accordance with application program commands, a refresh buffer provides display signals to visually present by means of the display screen a cursor at an identified position in text. AT9-80-033