In early 00's I went for cycling/drinking trips with few friends and wrote DOS program for collecting data from bicicle "computers" (manually transfetered, obviously), it produced charts in all the glory of VGA mode 12h and had export to HPGL, because the HP DesignJet we had access to (which was sold as "plotter", but in fact was giant InkJet printer) understood HPGL. Originally the input was simply text file with records separated by new line (produced as a note file on Casio data-bank), but later I wrote DOS immediate-mode GUI "spreadsheet" for capturing that data (on some random-ish mid-90's subnotebook).