HP 41C: A Hefty Refurbishment

The Hewlett-Packard HP 41C/CV/CX lineup of models was a remarkable quantum leap in handheld calculators: introduced in 1983 (Ref.), their modular extensability together with the consequent utilization of alphanumeric user interface made them extremely versatile, and placed them next to true microcomputer systems. Besides memory extensions, specialized program libraries, printer, and a magnet card reader --offerings that also were available for the TI 58/59 calculators-- you could plug