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Hello sir, I am using Nexys3 board along with digilent adept for bit file download. But in this board there are only 8 switches. I have seen there is possibility to extend I/O ports virtually with the help of digilent adept but how to use this feature. What is the procedure for this? If suppose i want to implement 8 bit adders i need (8+8) 16 input ports. How to achieve this with nexys3 board?