Hi guys, a bit of an update....after tons of research I've actually found and altered some code to suit my requirements. The problem that I'm having now is that I need a suitable program to test my code. I will be using a PICAXE-28X1, and three MAX7219s to drive my 19 digit display. Used BASIC programming language as it was fairly straight forward to use. Can you recommend a suitable program that I can use to simulate (preferable a free one)? Please see code below...