HP-97

The HP-67 and HP-97 were introduced as a matched set. The 97 had a printer, a larger case and a much larger battery pack. They were otherwise functionally equivalent. An HP Catalog described them as "A major leap forward in fully-programmable personal calculators. These are the most powerful personal calculators Hewlett-Packard has ever made." (Personal Calculator distinguished them from high-end calculators like the HP-9825 and "mid-range" models like the HP 9815.)