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There are important areas of synchrotron radiation research which would strongly benefit from the availability of energy dispersive detector arrays with high energy resolution and good spatial resolution. The goal of this developmental project is to produce a several element mercuric iodide (HgI2) submodule, which can later be multiplied and grouped into larger arrays of 100–400 elements. A prototype five-element HgI2 array detector was constructed and tested using a synchrotron radiation beam at SSRL. An energy resolution of 280 eV (FWHM) has been obtained for the MnKα line at 5.9 keV. Miniaturized processing electronics were developed in parallel with array advancement. To date, we have completed the hybridized preamplifier and finished breadboarding a computer controlled amplifier. The system integration aspects of large array detectors were studied, producing a conceptual design for both the detector array and its computerized data-acquisition and analysis system.