My editor Mike Loukides just noticed that Sun no longer seems to make available the Java Communications API for Windows, only Linux and Solaris. This didn't use to be the case. Are the older versions for Windows available anywhere? Or are there any third party implementations? If anyone knows of anything, could you please drop me a line? Thanks. Note: I'm only interested in actual implementations of the Java Communications API, not alternative APIs for talking to the serial and parallel port such as RXTX. Update: that was fast. Ulf Dittmer found it here. Stephen Drye notes that the IBM Development Package for Eclipse includes a Windows javax.comm implementation. Update to the update: I can't seem to find that. The docs refer to it, but the file doesn't seem to be included in the archive.