rossw,
Are you the same rossw on thebackshed.com? Thanks for your help here. I added your code and it works for ip1 fail low but not fail high. "xor ip1 ram2 ram2" evaluates as F,F,F,F,F,F,F, for each successive scan during fail low but T,F,T,F,T,F,T,F for fail high so it never gets to...