In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote: This line mov !rb,#$ff ; all of port B lines are output Should be mov !rb,#$00 ; all of port B lines are output Bean. ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=121474#m122108 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)