Work Area Allocation on Color Graphic Memory Planes
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-01
This article describes a technique for using surplus areas of three color memory planes of a color graphic display system as a single work buffer. The color memory planes contain color buffer areas used for storage of color data and mapped at the same address area, and the surplus areas are combined to constitute a single work buffer which is logically continuous as viewed from a microprocessor and mapped at the same address area as that of the color buffers. In work buffer addressing mode, the microprocessor address is translated so as to access the work area of a selected color plane. This technique facilitates utilization of the fragmentary surplus areas of the color planes for graphic processing, such as line drawing. The figure shows a color graphic CRT display system which includes color memory planes 20, 30 and 40.