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From: Richard Stallman <rms@gnu.org>
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Subject: Re: odd machine configs: mips-siemens, gec63, pfa50, att3b
Date: Sun, 21 Jul 2002 16:02:26 -0600 (MDT)
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    In the gec63, pfa50, and att3b config files, some configurations play
    some interesting games with VALBITS, VALMASK, and the like.  My guess
    is that this code predates DATA_SEG_BITS, and it would be enough to
    set DATA_SEG_BITS appropriately and let VALBITS and the rest be set by
    lisp.h.

You are probably right.  Those machines are quite old, and it could be
that nobody has one any more.  You may as well give this change a try
if it will help you proceed.