Hlello,everyone, Now I use the C167 system, and when I have compiled a project with uVision, I will find the first line in the HEX file like this:":020000020000FC". In the "Intel HEX File Format" section of "C16x/ST10 Assembler and Utilities User's Guide ", it says that "The Intel HEX file contains 8086 segment address records to specify a paragraph number (one paragraph is 16 bytes).The paragraph number is used as the offset for all subsequent data records in the HEX file.". And I know that "0000" befor the "FC" is the paragraph number,but I don't understand what's the true meaning of the "paragraph number". And why a paragraph is 16 bytes? can you tell me ? Thanks .