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In RTX166 Tiny if all tasks are left waiting for signal simultaneously for more than a couple of minutes, the system crashes (that is, when a signal is finally issued the program jumps to an unpredictable location). I checked that both in simulator and in target hardware. In simulator it can be seen that the problem occurs only after task timers roll over from 0 to 0xFFFF. I've never reported bugs before, so I don't know if the forum is a proper place for that. Anyway, be aware! Regards, Mike.
"I've never reported bugs before, so I don't know if the forum is a proper place for that." then you should check-out the 'Overview' and 'Tips for posting messages' links Bug reports should actually go to your local support address, but it can be useful to others (eg, those without support) to see if anyone's having the same problem. Others might also be able to suggest workarounds if there is a known problem.