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DCALC - an HP-style calculator for the Psion Series 5dcalc is an RPN (Reverse Polish Notation) calculator as popularised by Hewlett-Packard. Like the HP calculators it operates much more intuitively than calculators with an equals sign. It runs on the Psion Series 5.It features nice big clunky keys (easy to hit) and a nice big display (easy on my presbyopic eyes).
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