Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!bradley
From: bradley@cs.utexas.edu (Bradley L. Richards)
Newsgroups: comp.lang.prolog
Subject: Re: Arity Prolog
Message-ID: <187@qt.cs.utexas.edu>
Date: 5 May 90 22:33:55 GMT
References: <10830@sun.udel.edu>
Organization: U. Texas CS Dept., Austin, Texas
Lines: 22

In article <10830@sun.udel.edu> mulford@sun.udel.edu (George Mulford) writes:
>
>So the bottom line is:  this is a PC Prolog that works, even on a
>production scale

I agree that Arity has a *lot* of nice features.  However, I was terribly
unimpressed to find that it only runs under DOS 4.0 if you use an
undocumented switch on ANSI.SYS.  This means, for folks who use DesqView
and the like, that Arity *will not* run under DOS 4.0.  Given that DOS 4.0
has been out for a couple of years, this doesn't give me a great impression
of how up-to-date the product is.

To be fair, though, aside from Turbo (pseudo)Prolog, none of the Prolog's
I've evaluated support even simple things like the extended screen modes
available on EGA and VGA cards.  None of them are designed to be run under
a multi-tasking system like DesqView or (gack) Windows.

What gives?  Does marketing a product to the academic market excuse
companies from supporting system features that have been around less
than 6 years?

Bradley