Browse Prior Art Database

Double Scanned Raster Cursor Generation

IP.com Disclosure Number: IPCOM000056815D
Original Publication Date: 1988-Feb-01
Included in the Prior Art Database: 2005-Feb-14

Publishing Venue

IBM

Related People

Authors:
Parsons, DH Trynosky, SW [+details]

Abstract

A technique is described whereby circuitry used in high quality video display architecture is enhanced through the use of a double scanned raster cursor generator. The concept implements circuitry for double scanning cursor generation so as to be incorporated with color graphics adapters, as used in personal systems high resolution displays. In color video display applications, the vertical resolution is typically limited in the number of visual vertical lines causing text and graphics to be difficult to read, due to insufficient spacing between successive character rows. The concept described herein provides circuitry needed to control the cursor in double scanning of a raster display image and is used to place a blinking cursor on the display screen in text modes.