Design And Development Of A Computer Graphics System Based On The upd7220A Graphics Display Controller
Abstract
An interactive microcomputer graphics system is
presented. The system overcomes the drawing speed, memory
size and resolution limitations of typical 8-bit
microprocessor systems by incorporating the )JPD7220A
Graphics Display Controller (GDC). The GDC is positioned
between the microprocessor bus and the video display
memory with an RGB colour monitor acting as the display
medium. The various interfaces between these main system
components are discussed.
The video display memory is organized in three planes
of 256 x 4 kbits each. The resulting display has a
resolution of 480 x 540 pixels (interlaced) in eight
colours with four image areas accessible within the
display memory. Commands are issued by the host BBC
microcomputer in micro-coded form,and are decoded by the
GDC's internal logic to perform .the required operations.
A simulation of the Auger process has been attempted and
displayed in graphics form on the RGB monitor to validate
the system.
Citation
Master of SciencePublisher
University of Nairobi