This in many cases is not a problem, as the result shows either the
state before or after the interrupt and so the atomic variable itself is
not a problem.
Of course the user code needs to take into account that the result
already might be changed in the Pascal instruction. But I thinks this is
obvious, anyway.
To do a semaphore the state of which might be critical to be known at a
certain point you can do something like
bclr #0, (A0)
move ccr, D0
here the inverted state of the bit before the operation will be in bit 2
of D0.
-Michael
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