Thanks for all this! It really seems Microchip would have a public document that explains their part numbers. When I started this project, I think 32kB RAM was the largest PIC32. Now they go to 128kB or so. I'm juggling RAM go get everything to fit. Harold --=20 FCC Rules Updated Daily at http://www.hallikainen.com - Advertising opportunities available! --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .