> Can anyone point me where can I find some theory on the net?

The term I know is 'minimal change ordening' (referring to permutations)
and 'gray code'. This might not be exactly what you are looking for.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads