Browse Prior Art Database

Character Erase on APA Buffer

IP.com Disclosure Number: IPCOM000035959D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 3 page(s) / 98K

Publishing Venue

IBM

Related People

Aoki, Y: AUTHOR

Abstract

The character erase operation of an APA (all-points-addressable) buffer can be performed simply by this method.

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Character Erase on APA Buffer

The character erase operation of an APA (all-points-addressable) buffer can be performed simply by this method.

When a character on the APA buffer is going to be erased, the image of that character is prepared first. Then it goes to the mask data generator, as shown in Fig. 1. The role of the mask data produced by the character image is to (a) allow the writing of the character image in its

character box and

(b) leave unchanged the other area of the character

box.

The color code generator is set to the equal color of the background of the character box to perform the erase operation.

(Image Omitted)

After the setup procedure which is described above, the write operation to the target character position is executed.

The write operation works as the font image erase, and the rest of the character box is unchanged, as shown in Fig. 2. That is, before the erase operation, there is a character image of, for example, E and a grid line, and after the erase by this method, the grid line is unchanged.

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