[att.sys.unixpc] Spurious interurupt - what is it?

wilber@alice.UUCP (03/28/88)

What does

    Spurious interrupt - level 2

in the unix.log file mean?  I've been getting lots of these.

Bob Wilber   Work: UUCP: {allegra, mtune, ihnp4}!gauss!wilber
                   ARPA: wilber@research.att.com
             Home: UUCP: {allegra, mtune, ihnp4}!gauss!heaven!wilber
                   ARPA: heaven!wilber%gauss@att.arpa