We are using the BitsyX with WinCE build 4.20.17 and SmartIO 3.1, and when using a PS2 keyboard occasionally the keys act like they are 'stuck', repeating the keystroke until I hit another key. I cannot reproduce this behavior at will, but I was wondering if anyone has seen this behavior or has any suggestion as to what might be causing this. I am going to update to the latest WinCE build (4.20.38 ?) and see if that fixes the problem.
My bet is that you are probably using ADSmartIO rev 3 (reports something like "0010 rev 3" on the debug port during boot), which should be fine.
It looks like BitsyX build 4.20.25 has a fix for interpreting the F7 key, which suggests that we did some work on the ADSmartIO driver. Updating to 4.20.38 is probably a good move.
If you can find a way to reliably reproduce the issue, it will help. Since this is a CE issue, I have moved your post to the CE Drivers forum.