This package implements various Hewlett-Packard RPN calculators. This is the first beta release, designed to prototype the OO base class. Two HP RPN calculators are supplied: HP-21 Scientific (second generation HP-35, 1975 HP-16C Computer Scientist, 1981 These prerequisites, while not strictly required by the HP modules, are used by the sample program tkhpcalc: Tk::Splashscreen Tk::ProgressBar::Mac Installation follows the standard idiom: perl Makefile.PL make make test (sudo) make install Steve Lidie sol0@lehigh.edu 2003/02/15