In the domain of software visualizations, taxonomies have been built to classify and evaluate environments for algorithm and program visualization. Taxonomies are valuable too, in the development phase of new environment. The field of computer architecture and assembly language that is at the border of the software and hardware domains has been neglected. In this paper I present a taxonomy focusing on this field with emphasis on the didactic and cognitive aspect of the visualization environment. The ECPU learning environment was developed to teach computer architecture and assembly language at introductory level. The considerations that were taken in account during the ECPU development are presented in the context of the taxonomy.
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