I'd just like to say thanks to everyone who responded to this, Scott, Andy, Bob, Thomas, Olin, David et al. It's given me something to think about, and I think I need to step back and examine the options. The main trouble is I have virtualy nothing in the way of a software spec for this project, I just have to get something "working", in as short a time as possible...I'm sure others have been here!! Regards Mike -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:","[SX]:","[AVR]:" =uP ONLY! "[EE]:","[OT]:" =Other "[BUY]:","[AD]:" =Ads