kernel panic with pccard insert on recent 7.0 CURRENT

[Wilkinson, Alex]

    0n Sat, Jun 16, 2007 at 11:56:59PM -0600, M. Warner Losh wrote: 

    >Yes.  I'm pretty sure that's wrong.  All ISA and PC Card devices use
    >edge triggered interrupts.  Also, it is inefficient for level
    >triggered interrupts, since two interrupt sources on the same
    >interrupt may trigger at about the same time...

What is meant by "edge triggered interrupts" ?

 -aW

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