That's the only assembly routine I have in the code. It's all attached but if you need I'll include in the body of a post. Yeah Dave (Don't know what was happening there with attachments...thanks again). Anyway I tried CMCON=7 and CMCON=%00000111. When the code hits "high l9:high l11ause 3:"..l9 flashes (almost imperceptibly) then l11 goes high. When it gets to the next section ('High l10:low l11:high l12) then l10 goes high and l12 does nothing!!