>The transmit() function takes as input a 4-bit number (0x00-0x0F) and >returns a 7-bit codeword (original input unchanged in bits 0-3, three >check bits in bits 4-6, and bit 7 clear). Now that would make an interesting way to obfuscate a hex download for a bootloader :)))) -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist