C stack frame sizes

[John Collins]

>The I/O buffers were declared as local variables in the main function....
>thus were on the stack.  Given the constraints imposed by the PDP-11
>MMU, this actually resulted in a net gain in useful data memory as
>compared to allocating buffers dynamically using sbrk.
>Mike Lutz

Yes - but that isn't the same as what I said. Fine if it is the main routine
but if you DON'T want a big stack, but early on you call (from main) a
routine which does, you eat up memory forever.
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