Yes, but the HP-42 is mostly valuable for nostalgic value, later models were significantly enhanced. As an example, unit conversions (basically, convert between

Yes, but the HP-42 is mostly valuable for nostalgic value, later models were significantly enhanced. As an example, unit conversions (basically, convert between every unit known to man) is something I use every day. It takes about 6 keystrokes to convert from anything to pretty much anything on a HP-50G.