Hello All. I have reconstituted Jon Bentley's DFORMAT preprocessor (troff and awk source) and made it available on GitHub. See https://github.com/arnoldrobbins/dformat. This is an awk program that reads a description of data layouts, such as registers or network packets, and generates PIC descriptions. A Makefile generates PDF from the dformat.ms file using GNU troff. Jon Bentley was helpful in the final stages, including contributing his original files. Enjoy! Arnold Robbins