MSP430G2553 based DIY calculator

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Chris Chung’s entry to 2015 Hackaday Prize is a MSP430G2553 powered DIY calculator that executes microcodes for Hewlett-Packard old-time HP-21, HP-25C and HP-33C calculators.

DIY calculator that emulates HP

DIY calculator that emulates HP-21, -25C, and -33C calculators

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