This work is about design, implementation, menu and communication with superior system for gamaspectrometer. The first part of the document describes basic principles of measuring of gamma spectra and their processing. The second part describes in basics software core of the spectrometer, handling of the keyboard, graphic and text output. Used algorithms are described, and their implementation. The third part contains analysis of requirements on menu, basic concepts of menu control. Next, it is described how to handle inputs from user, like numbers, date and time, and also how to solve the menu for display of values and for input of values. The forth part describes requirements for communication with superior system (PC), analyses how to do deal with this and reasons for this solution. The conclusion brings all concepts used in the previous chapters and reached goals.