can't find good price for 4Mhz crystal, but see one sell=20 for 6MHz crystal.=20 I have been test 20Mhz f877a, to 24MHz, without problem.=20 any one tried 4MHz pic under 6MHz crystal? -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist