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Cache memories represent a core topic in all computer organization and architecture courses offered at universities around the world. As a consequence, educational proposals and textbooks address important efforts to this topic. A valuable pedagogical help when studying cache memories is to perform exercises based on simple algorithms, which allow the identification of cache accesses, for instance, a program accessing the elements of an array. These exercises, referred to as code-based exercises, have a good acceptance among instructors of computer organization courses. Nevertheless, no tool (e.g., simulator) has been developed to be used in undergraduate courses working with this kind of exercises; therefore, students perform such exercises by means of the classic paper and pencil methodology. To fill this gap, this paper proposes a new pedagogical tool, namely Spim-cache. A laboratory example is also presented for illustrative purposes.