On Sat, Feb 14, 1998 at 03:29:21AM -0500, Michael Richardson wrote:

>   I'm not sure exactly how to do edge triggered sharing: I assume that
> one just has to poll all the devices before exiting the interupt
> service routine in case another device has caused an interrupt since
> the first time entered? Or does the 8239 do something about this?

There's nothing you can do about it.  There's always a chance that two
edges occur simultaneously and you have no way of knowing that, except
polling all the devices sharing that interrupt signal.

One more thing that Motorola got right from the start..

  -jm