Questions: [1] How do I tell if a button has been pressed? [2] Is the port grounded by a switch when it is pressed? [3] Can a TTL signal be accurately read from this port? Thanks in advance. P.S. Please do not respond to ask what I am doing. It is a surprise and will be announced later. Thankyou. -- To e-mail me directly please remove "NOSPAM" from the reply-to address.