Hi,

As it would happen I have addressed a Matrix Orbital Display, rather a large Graphical one, I dont remember the exact model. I tried 232 but I got the best results with I2c. Planning was the most important part of the project. I was using the display for bar graphs and custom text. So I did a layout on paper first. I also found that storing the I2C commands in a I2c memory chip saved a lot of space in the PIC