In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote: Andrew, After the assembly code changes FSR with "MOV FSR,#rxBuf" any variables in location > $0F, until FSR is reset with "BANK $00" In the code you posted rxHead and rxByte both must be in location <= $0F. Try declaring them first. Bean. ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=152738#m152805 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)