In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote: Paul, Don't set the address manually. What is happening (probably, you didn't post your code) is that your interrupt code is pushing down your SUBs out of the 1st half of the code page. Do this... '----------------------------- INTERRUPT GOTO IntHandler MySub1 SUB MySub2 SUB PROGRAM Start IntHandler: ' Interrupt code RETURNINT Start: ' Program code END '--------------------------------- Bean ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=133780#m133790 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)