xp95

Hi everybody, I am working in project which aim to control 80 device through serial port. First ,I made a simulation by Proteus and virtual port Second, I used Micro C for Pic programming Third, C# 2008 for computer interface The simulation Succeeded but when i try to apply it on 8 devices in reality its failed ( LEDs open randomize) Can any on tell me the reason? Here all project files http://www.4shared.com/file/KDAOA3nY/Final.html