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mathcode of non printable characters

In plain.tex and consequently in lplain.tex there are \mathcode
assignments for control-a (ASCII 1) and the like. A while ago I
removed all these from lplain.tex (without someone noticing it, it
seems). Is there any reason why these should remain?


{\catcode`\^^Z=\active \gdef^^Z{\not=}} % ^^Z is like \ne in math

Another issue are active math characters. Currently there are:

\mathcode`\ ="8000 % \space
\mathcode`\'="8000 % ^\prime
\mathcode`\_="8000 % \_

I can see the reason for prime, but why the other two?

   Rainer Schoepf
    fuer Informationstechnik Berlin
   Heilbronner Strasse 10
   D-10711 Berlin
   Federal Republic of Germany
   <Schoepf@sc.ZIB-Berlin.de> or <Schoepf@sc.ZIB-Berlin.d400.de>