The software design for multifunction

color-variable LED matrix display controlled by a single board computer is described. The software not only can be used in the multifuction color-variable display of the LED matrix

but also can be used in the powder EL

thin film EL and other matrix displays. Using the program depicted in this paper

it is able to display alphanumeric digit

graphs and lines with three colors of the red

green and yellow.The multifuction color-variable display device having 16×50 picture elements is controlled by a TP-801B single board computer. The element of the matrix panel consists of the double-color LEDs. With the aid of a suitable hardware interface circuit

the characters or graphs

which are to be displayed

are stored into the memory of the computer and the display is controlled by the dynamic scanning program. The display has advantages of low power dissipation

low cost

high level of integration and high stability. Especially

its color

display contents and operation mode can be controlled with great ease. It can be widely used in subway stations and airports as the place name and time display

and in gymnasium and stadiums as the score display. It can also serve as the display terminal of military command systems.According to the software design Z-80 assembler language was used to make the program. The program was debugged and optimized

and then was writted into the EPROM.All the desired results have been achieved.