NetNews Usenet Archive 1993 #1/NN_1993_1.iso/spool/comp/sys/cbm/5322

Internet Message Format | 1993-01-05 | 2.5 KB

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From: [e-mail] (Michael W. Kelley)
Newsgroups: comp.sys.cbm
Subject: Re: Announcing CHARITYWARE: The best cruncher on C64 ever!
Date: 5 Jan 1993 11:34:49 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Lines: 37
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (Michael W. Kelley)
NNTP-Posting-Host: hela.ins.cwru.edu


In a previous article, [e-mail] (Alexander Schuetz) says:


>Well, the title says it and I promise it. But first, the story so far. Do
>some guys remember the (quite wellknown) DARKSQUEEZER? Yes? Good. And if
>you know other Lempel-Ziv style crunchers on the C64, you should know that
>they are very slow.
Never heard of it before, and I am our user groups founder.  Must have
been before my time.
>
>What I did is basically the following: I took an already existing cruncher
>(Darksqueezer ofcourse), checked out why he is so slow, found the reason
>and speeded him up a bit. That is, by factor 63 on a 512K ram expansion
>(Commodore 1750) or about factor 28 if you use a 1764-ram expansion (256k).
>The idea behind is, ofcourse, to make a data structure that makes searching
>for sequences faster. I simply settled down for an array of lists, which
>eats alot memory but does the job quite nicely.
>Well, this wouldn't have hurt me so much at all, but thing is, I am a real
>poor guy (both of my parents are living in retirement and I'm studying...)
>so I wanted to earn some money with my idea. Now that's gone out of the
>window I suppose. Worse, other guys might try to steal my code, claim they
>did it themselves and sell it.
But unless you are the author of Darksqueezer, didn't yoo do the same thing?
>
>Wonder why I'm the first one with this idea. The ramexpansion is out since
>atleast 1988.
By requiring an REU, you have limited the audience for 'your' product.
What I didn't see was how the compaction compares against .ARC or .LZH
on the Commodore, AND how compatible it is.
Do you have to uncrunch the file to run it, or is it runnable in
crunched form?
--
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