Hi all, I'm working with RTX-51 tiny2. And when take a look in the RTX-51 tiny folder, I find some assembly files define funtions that aren't mentioned in the RTX-51 tiny manual. Those files are: os_clear_user.a51, os_send_user.a51, os_send_run.a51 and os_set_run.a51. The function's names are the same the filenames. What are those functions for? Thanks for reading.