公开(公告)号：DE3175214D1

公开(公告)日：1986-10-02

申请号：DE3175214

申请日：1981-08-19

Applicant: IBM

Inventor： DWIRE JEROLD DENNIS

IPC: G06F3/153 ,  G06F17/21 ,  G06T11/20 ,  G09G5/00 ,  G09G5/22 ,  G09G1/16

Abstract: The display system includes a processor (50) loading the address of each line start character into the pointer area of a refresh memory (9) with variable line start addressing and a line counter (5) which counts the lines being displayed on the display (1). The RAM refresh memory (9) which contains the line start addresses and character data is first addressed by the line counter outputs (11-15) by the intermediary of a multiplexer (7). Since the refresh memory (9) is used as the line pointer register the output bus (4) for pointer data and character data is common. Once the address of the first character in a line is read from the pointer area in the refresh memory it is loaded into the address counter (6) which then controls the sequential reading of characters in that line from the refresh memory (9) onto the data bus (4). Following the reading of each line the sequence is repeated, e.g, the line counter (5) is incremented, its count used to address the pointer area and the address contained therein loaded into the address counter (6).

公开(公告)号：DE3173595D1

公开(公告)日：1986-03-13

申请号：DE3173595

申请日：1981-03-12

Applicant: IBM

Inventor： DEMKE KENT RAY ,  DWIRE JEROLD DENNIS ,  KO MICHAEL ANTHONY ,  MUMOLA JOANNE LORRAINE

IPC: G09G3/00 ,  G06T11/20 ,  G09G5/26 ,  G09G5/28 ,  G09G1/16

公开(公告)号：DE3177294D1

公开(公告)日：1993-01-28

申请号：DE3177294

申请日：1981-10-27

Applicant: IBM

Inventor： DEMKE KENT RAY ,  MUMOLA JOANNE LORRAINE ,  DWIRE JEROLD DENNIS

IPC: G06F17/21 ,  G09G1/16 ,  G09G5/08 ,  G09G5/22 ,  G09G1/02 ,  G06F15/20

公开(公告)号：DE3478825D1

公开(公告)日：1989-08-03

申请号：DE3478825

申请日：1984-04-05

Applicant: IBM

Inventor： DWIRE JEROLD DENNIS ,  CREHAN DONALD THOMAS

IPC: G09G5/20 ,  G06T11/20 ,  G09G5/22 ,  G09G1/16

Abstract: A processor controlled character box display is provided with apparatus which permits the display of curvilinear graphics. The characters used to generate the graphics display are selected from a limited character set in read only storage (46), byt by shifting the characters up or down by less than a full line index to provide additional character positions, it is possible to produce curvilinear graphics without the need for further character generation. Since the graphics display is a low resolution display, it is necessary to make a best dot selection in order to map the print bit map into the character box display.