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The x-ray fluorescence analysis (XRFA) is a widespread method analysing chemical elements. For evaluation of the spectrum and the quantitative analysis a minicomputer and for data acquisition a multi-channel analyser are generally used. Our purpose was to solve the data acquisition and processing the XRFA with a microcomputer based on the INTEL 8080 family containing an analog to digital converter (type: Burr-Brown ADC 84KG-12). This dedicated-equipment is quite inexpensive, easy to use and the concentration of the chemical elements in percentage is shown immediately. Changing the program (that is EPROM chips) this microcomputer system can be easily modified for analysis of different specimens in perfectly different branches of science.