Belated reply...thanks to all who posted comments/ideas to my original query. That was only 2 weeks ago. Project is slipping into never-never land for a while due to lack of funding on my clients part. Shame. Hopefully though it will come back again and I'll be able to post the answer back here. They have found enough finances for the firmware to be overhauled (again, not by me), so there's a chance the problem may disappear when that is done. Best regards, Brent. -- Brent Brown, Electronic Design Solutions 16 English Street, Hamilton, New Zealand Ph/fax: +64 7 849 0069 Mobile/txt: 025 334 069 eMail: brent.brown@clear.net.nz -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads