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(not really about) problem with ux400

    Date: Thu, 28 Jun 90 08:44 PDT
    From: Charles R. Fry <Chucko@CHARON.arc.nasa.gov>

    Yipes!!!  Any tagged computer architecture in which all-ones is a valid
    datum scares me.  (Likewise all-zeroes.)

Well, at least the all-zeroes case is invalid, at least on the 3600
series; a zero tag results in the infamous "Error: The word #<DTP-NULL
...> was read from location ...."