itsy bitsy Unix

Cameron> Does anyone know a true (not a homebrew hack) multitasking Cameron> environment that will run in 16K or less, preferably with Cameron> available source? Does it have to be Unix? There are some real-time OSs that fit in that sort of space. You might take a look at MicroC/OS -- which is open source and documented in full in the book by its creator, Jean Labrosse. The only drawback I noticed is that it has the somewhat peculiar limitation that every task has a different priority, which is just the opposite of what I want. Another possibility would be to use FORTH. That had (cooperative) multitasking support for a very long time. Come to think of it, cooperative multitasking is trivial, you can code your own. It looks like this: for {;;} { task1(); task2(); task3; /* etc */ } and each task simply does stuff for a while, then returns when it has nothing left to do or when it's time to give another task a shot at the CPU. That sort of system is very simple and very reliable. paul