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New Character Mode for High Frequency Display

IP.com Disclosure Number: IPCOM000058497D
Original Publication Date: 1988-Nov-01
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Related People

Authors:
Hayashi, O Watanabe, S [+details]

Abstract

This article describes a method for mapping character font images to an APA (all-points addressable) buffer in a new character mode for high frequency display. The figure shows a block diagram for the new character mode. In the character mode, the CPU (not shown) stores character codes and attribute data into code/attribute buffer 10 as usual. Font mover 12 can be activated by the CPU and it acts asynchronously with CPU operations. First, font mover 12 gets a code and attribute data from code/ attribute buffer 10 which corresponds to a particular position on the display screen. Second, font mover 12 generates a font buffer address corresponding to the code data and gets character font image data from font buffer (character generator) 14.