TurboPower Async Professional

APD is way less CPU intensive in the current system, in particular servicing multiple comports. At least with the various other lightweight, direct to WinAPI (readfile,writefile) methods I've tried so far.

One should be able to call GetChar without fear of bogus data.

That being said, I may have an idea. I was checking for InBuffUsed > 0 to determine if a character is ready, that's probably not the right way to do it. Changed to a test on CharReady, hopefully that will help.