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Enhanced Character Generator for Video Graphics Array

IP.com Disclosure Number: IPCOM000040477D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

Authors:
Genovese, PM Rackley, DP Thompson, SP [+details]

Abstract

A technique is described whereby a video character generator, as used in a video graphics array (VGA), is enhanced so as to allow the simultaneous raster display of many characters which use character generators in text mode. The enhancement is particularly useful in desk top publishing applications so as to simultaneously display multiple symbol sets in several styles, such as italic, bold, subscript, superscript, etc. (Image Omitted) The current memory map organization is shown in Fig. 1. The VGA is capable of supporting eight character generator tables loaded into the font area in Map 2. One or two character generating tables are usually selected for the simultaneous display of character shapes. Generally, this is adequate, but for some applications, it is desirable to display many more characters simultaneously.