01040nas a2200169   4500000000100000008004100001100001900042700002600061700001700087700001600104700001800120245005500138856004600193300001400239490000700253520061000260       2020                            d1 aCarles Aliagas1 aMontse García-Famoso1 aRoc Meseguer1 aPere Millan1 aCarlos Molina00aA Low-Cost Multicomputer for Teaching Environments  uhttps://doi.org/10.1109/RITA.2020.3008098  a171–1820 v153 aWe propose a teaching resource that uses HardKernel boards to build an MPI server with 256 cores. Although this system has a relatively low performance, the aim is to provide access to hundreds of cores for carrying out scalability analyses, while obtaining a good trade-off between performance, price, and energy consumption. Here, we give details about the implementation of this system at both the hardware and software levels. We also explain how it was used to teach parallel programming in a university degree course, and discuss the teachers’ and students’ comments about using this new system.