ATmega128/2556: Reset behavior

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Hi there, hopefully someone knows:

On a system using external RAM, what happens when the reset pin drops ?
Is a running write-access to external RAM abborted asynchronously ( =
immediately ), or,
is such a bus cycle completed before ?

And, what happens to all other I/O pins/ports in this case ?
Are they driven high immediately (=asynchronously), or, are they driven high
as soon
as a bus cycle has completed ?

Thanks in advance,

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