Hello We are developing software to interact with small robots for educational purposes. To do this we need to use the serial port. SerialPort class that includes Pharo does not work on mac or linux, because it´s not able to open ports by name. It would be interesting that future versions include a SerialPort that would work in these circumstances. we are using since a time a´go the plugin that comes with Scratch, with this we just copy the plugins in the folder of the VM, the Plugin that comes with the VM Scrath, and add to the image of the image classes of Scratch , ScratchPlugin and SerialPort2.Up to date this has worked on all VM including the latest Cog. It works on Linux, Mac or Windows.We wory that future versions will lose support. The source code for the plugins can be found on: http://info.scratch.mit.edu/Source_Code ScratchPluginSrc1.4.zip Joan Güell jguell@e-citilab.eu Joan Güell jguell@e-citilab.eu