Thanks Dave,
I will try your recommendations when I get to work tomorrow. Looking at the rise time 9 ns today makes me think that that is probably not the problem. Takes a lot of 9 nsec to add up to 3 usec I am going to look at it closely so at least I understand more about what is going on and the effects of rise/fall times in general. Looks like you have a bunch of stuff I need to look at on your web site. So much to do, so little time. Thanks, again. CC