> So, what do each of you keep in your prototype cases? 10F200, 12F629, 12F675,16F84A, 16F628A, 16F877A, 16F88 18F1320, 18F2520, 18F452, 18F4520, 18F4550, SX18 Some are still there from previous purchases and are replacement parts only - 84A, 628A, 877A, 452 Current design work is with the others. Which one I use depends on application. 10F and 629 for small jobs, 4550 for USB, SX18 for pure speed and so on. F88 and F1320 are probably my most- often used mid-sized starting point. If using a new family I tend to first get the one with many features and then decide which other, cheaper, ones can be used for specific jobs. As a free-lance I never know what's going to be asked for next, so having all-round parts to experiment and assess with is helpful -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist