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Hold Screen and Line Output Speed

From: Jan Burse
Subject: Hold Screen and Line Output Speed
Date: Sun, 22 Aug 2010 17:34:23 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; de; rv: Gecko/20100701 SeaMonkey/2.0.6

Dear All

I am playing with GNU prolog:
        GNU Prolog 1.3.1
        By Daniel Diaz
        Copyright (C) 1999-2009 Daniel Diaz
        on windows vista

I am running the following query:

?- repeat, write('Hello World!'), nl, fail.

The query will infinitely output the line
"Hello World!". This is fine.

    Ctrl-C does not work, menu item Interrupt
    does also not work. The interrupt text is
    shown, but then it scrolls away?
    This is strange.

Question 1:
    Is there some Hold Screen button?
    (A toggle where we can switch on/off the
    blocking of the output producer)

Question 2:
    Is the speed of the terminal scrolling
    just an artefact from the GUI speed, or
    is there some setting for this?


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