Title:
RASTER SCAN DISPLAY SYSTEM
Document Type and Number:
Japanese Patent JPS6049391
Kind Code:
A
Abstract:
In a raster scan digital display system, a display image is stored, as coded characters or a bit map, which is larger than the display image. In order to define an image, within the stored image, for display, the addressing system for the memory (or memories) storing the image include a display image defining circuit. This circuit includes an address counter which is incremented to define successive addresses of data in a line of the displayed image, or row of characters therein. The circuit includes a first register to receive the initial address of a display image and a second register to receive a value indicating the width of the stored image. For the initial line (or character row) of a displayed image, the address counter is loaded from the first register and incremented from the initial address. For each subsequent line (or character row) the address from which the counter is incremented is the sum of the initial address of the previous line (or character row) and the value in the second register.
Inventors:
DEEBITSUDO AREN KUMAA
JIESASU ANDORE SAENTSU
SUCHIIBUN UEIN TORINOSUKII
JIESASU ANDORE SAENTSU
SUCHIIBUN UEIN TORINOSUKII
Application Number:
JP14458184A
Publication Date:
March 18, 1985
Filing Date:
July 13, 1984
Export Citation:
Assignee:
IBM
International Classes:
G09G5/00; G09G5/34; G09G5/395; (IPC1-7): G09G1/02; G09G1/06
Attorney, Agent or Firm:
Toshio Sawada