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From: Paul Rubin <no.email@nospam.invalid>
Newsgroups: comp.lang.forth
Subject: Re: Straight Forth Re: Stack Sizes
Date: Mon, 17 Oct 2016 16:40:39 -0700
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rickman <gnuarm@gmail.com> writes:
>>  : 0/1 0<> NEGATE ;
> Maybe I'm not getting what 0/1 is supposed to do.  If you are just
> trying to clean up the flag, wouldn't juse 0<> do the job? 

It's turning the flag into 0 or 1 as the name indicates.  0<> 
would turn it into 0 or -1.