Mark Birks wrote: > For a start I know the 16C6x devices only have a 2-level stack > whereas the 16C84 has 8-levels. Mark: Only the 16C5x devices have a two-level stack; the others (including all the 16C6x's) have at least an eight-level stack. -Andy === Andrew Warren - fastfwd@ix.netcom.com === Fast Forward Engineering - Vista, California === http://www.geocities.com/SiliconValley/2499