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cba
Registered: Apr 2002 Posts: 935 |
History of Crunchers & Packers
I am very curious what crackers from back in the day used for crunching or packing their releases.
Self made ones I can only assume. Are any of them available here at csdb ?
I am talking about the very first ones like :
1103
ABC Crackings
Mr.Z
The period before 1986 , so before the Card Cruncher from the 1001 crew
Anyone here who knows more about this ? |
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tlr
Registered: Sep 2003 Posts: 1762 |
Quote: Not to mention that his name is ostensibly neither Lempil nor Ziv ;)
Seriously though, does anybody know which paper first described the use of bit compressed offset/length pairs?
The most common usage seems to be LZ77 with entropy coding in separate steps IIRC. |
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cba
Registered: Apr 2002 Posts: 935 |
Check : http://www.ffd2.com/fridge/chacking/c=hacking16.txt
"Milestones of C64 Data Compression"
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Mace
Registered: May 2002 Posts: 1799 |
I once had a go at some Huffmann algo myself, but failed miserably when trying to think of a way to store the 'tree' in the memory of the C64 :) |
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yago
Registered: May 2002 Posts: 332 |
morse-code can be considered one of the first packers
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SIDWAVE Account closed
Registered: Apr 2002 Posts: 2238 |
Morse code doesnt pack, it extends.
S (1 char) -> ... (3 chars) |
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Graham Account closed
Registered: Dec 2002 Posts: 990 |
No it converts a 26 character alphabet into a 3 character alphabet with character length depending on how often the letter is used.
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tlr
Registered: Sep 2003 Posts: 1762 |
That's quite similar to Huffman with a static tree when you think about it. :) |
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Catweazle Account closed
Registered: Aug 2021 Posts: 8 |
I analyzed and heavily improved the matcham time-cruncher V4 or V5 for my own demos and released it as the "News-Packer" under the fun pseudo name "Sado-Maso-Marketing" at this time Catweazle/Alcoholics.
The News-Packer could show the disc contents by pressing the $ sign to find the names, had an incredible amount of different decruncing effects and some new and improved crunch modes with much better efficiency or much better speed and you could compress files with nearly full ram usage - also the shadowed RAM.
This cruncher was far beyond of its time using a very special way of run-length encoding with some extraordinary ideas and technology never heard and seen before and this motivated myself to learn everything about compression and into creating my own crunchers with special speed-up tables later on Amiga and PC. I also developed different hyperspeed technologies (some were much quicker and more efficient than quick hashing with much better memory usage!) for compression. From time to time I also nowadays read of new technologies and try them out for comparison reasons just for fun. Cruncher Tech and encryption/decryption is still a very interesting hobby for me.
I´m rather sure the next step afterwards impressing me was the cruel cruncher. But I did never dive into its code working on my own algorithms. Perhaps someone knows more about how it worked in detail? |
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chatGPZ
Registered: Dec 2001 Posts: 11293 |
News Packer V1.0? Are you sure this isnt a textimprovement of Timercruncher v4? :) |
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Zyron
Registered: Jan 2002 Posts: 2381 |
*brings the popcorn* |
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