Six laboratory works of the tutorial are methodically connected by a single goal: to develop an assembly program for calculating a given function on a fixed-point digital computer that is optimal in accuracy and speed. Each work provides an example of its implementation with detailed comments. The laboriousness of the laboratory workshop corresponds to the curriculum for the direction of training "Informatics and Computer Engineering" in the profile "Computers, systems and networks." The manual can be useful for students, graduate students, engineers and professionals who want to improve their skills in low-level programming.