> http://joshworth.com/dev/pixelspace/pixelspace_solarsystem.html Someone drew up a "somewhat more to-scale" drawing of the 32bit address spa= ce of an ARM microcontroller. It's pretty sparse as well. (Interestingly, 32bits worth of kilometers is just about enough to measure = the distance from the Sun to Pluto. If it were in moon-diameters, it would= be far more than sufficient.) BillW --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .