>Although I use PICS I also have an interest in the '51 range of controllers. >Does anyone know if there is a specific list for this controller or any like >minded lists? > >Sorry if this is too off topic but it seems to me to be a good place to ask. Great question - I would also like to know - thanks. In any case its conceivable for designs to utilise more than one microprocessor and they need not be from the same manufacturer. A recent feasability study for an alarm system pointed to a good benefit by using a 68HC11 (as main controller) and an AT89C2051 (as protocol controller). Rgds Mike Some say there is no magic but, all things begin with thought then it becomes academic, then some poor slob works out a practical way to implement all that theory, this is called Engineering - for most people another form of magic. Massen