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Search Again :: Adv Search 1000 results in 0.003s
<1234567…34>
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ... planning to work on data compression. Although I quickly changed ... However I invented a new compression algorithm for [B]"ZX7"[/ ... always find the best data compression) and nearly instantaneous on ... that [B]"ZX7"[/B] uses LZ77 compression only. In practice, its " ...
    Einar Saukas Einar Saukas December 2012 Brand new software
  • rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…

    ... I put into my WIP LZ77 compression routine and tested with a ...
    Battle Bunny Battle Bunny March 2012 Development
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    [QUOTE=antoniovillena;672340]The idea is that you add an option in the compressor to avoid >255 length (an output a shorter escape secuence). So you offer 2 decrunchers, one of 68 bytes (option disabled) and other of 64 bytes (option enabled). Also you ...
    Einar Saukas Einar Saukas January 2013 Brand new software
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    I've written an LZ77 en/decoding routine as I ... its intended purpose of data compression.

    I was looking ...
    Battle Bunny Battle Bunny March 2012 Development
  • New compression method: Exomizer 2After I finished working on optimizing aPLib's decoder, I was told that pucrunch did compress better, and while looking for info about pucrunch (it t…

    ... that clearly beats both on compression: exomizer 2.

    [url ...
    Metalbrain Metalbrain December 2007 Development
  • Simple text compressionI just checked one idea about text compression. Do not take it as recomendation but rather as info which can you save some time when you are solving …

    ... checked one idea about text compression. Do not take it as ... idea:
    Need for text compression which compress well short messages ...
    Fikee Fikee May 2009 Development
  • packers / crunchers and general compressionI'm just curious where I would find such things, coming from a c64 background also , there is shedloads. I mean the obvious things like crunchers fo…

    ... maps, char packers etc also.. compression in general and perhaps things ...
    fog fog November 2009 Development
  • Z80 internal compressionThis isn't exactly a ZX Spectrum problem, but since WOS probably has some of the best Z80 coders in the world, I thought I might ask anyway. For my …

    ... have a large buffer for compression - max. 768 bytes could be ... ideas how to achieve better compression under these circumstances? Speed is ...
    utz utz May 2013 Development
  • Grammar-based data compressionI'm working on a game for the 48k Spectrum but want a way to compress a lot of screens into a small space, so I'm looking into data compression. Each…

    ... I'm looking into data compression. Each screen is an currently ... on a fast PC so compression space/time is not that ...
    i love the z80s i love the z80s May 2015 Development
  • Compression comparisonsI did some comparisons of different compression methods. To make this relevant to zx spectrum, I first gathered a corpus of relevant data: 6660 .TAP …

    ... did some comparisons of different compression methods. To make this relevant ... , also used 7z with ultra compression level; it has a large ...
    Sol_HSA Sol_HSA January 2016 Development
  • Text compression methodsI once typed in a Text compressor from INPUT magazine, it worked on a first and second most common following letters algorythm and reduced the binary…

    ... . one could get around 40% compression.

    I was thinking ... an average of over 50% compression be acheived. Of course I ...
    dmsmith dmsmith September 2022 Sinclair Basic
  • z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…

    ... use these things as a compression/decompression layer so you could ... and bitbuster basically uses LZ compression which assumes that all previous ... /> (for pucrunch which is hybrid LZ77+RLE+simply statistical compressor it ...
    Fikee Fikee October 2005 Development
  • z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…

    ... bitbuster basically uses LZ compression which assumes that all ... pucrunch which is hybrid LZ77+RLE+simply statistical compressor it ... looked into what these compression utils are doing yet. ... use, choosing between max compression and max flexibility. Personally ...
    Alcoholics Anonymous Alcoholics Anonymous October 2005 Development
  • Simple text compressionI just checked one idea about text compression. Do not take it as recomendation but rather as info which can you save some time when you are solving …

    ... tokens will clearly effect the compression. [/QUOTE]
    my compressor ... Combine it with word-based compression: While you are compressing the ... will be nice. i discarded LZ77 just because it will not ... it gives instant 75% compression and it is pretty simple ...
    Fikee Fikee May 2009 Development
  • packers / crunchers and general compressionI'm just curious where I would find such things, coming from a c64 background also , there is shedloads. I mean the obvious things like crunchers fo…

    [QUOTE=joefish;401334]Do most compression algorithms allow you to unpack ... commons methods on speccy are LZ77 (and variants), RLE and Huffman ... variants) or combinations.

    LZ77 family need to keep history ...
    Fikee Fikee November 2009 Development
  • Just wondering (Data compressors back in the 80s)While utilizing some sort of data compression is admittedly the norm for Speccy productions nowadays, it doesn't seem to have been the case back in t…

    [QUOTE=Ralf;505970]Compression wasn't popular in the ... slow
    * they gave little compression ratio and used only very ... />
    i would say that LZ77 (1977) and LZSS (1982) are ...
    Fikee Fikee January 2011 Sinclair Miscellaneous
  • New compression method: Exomizer 2After I finished working on optimizing aPLib's decoder, I was told that pucrunch did compress better, and while looking for info about pucrunch (it t…

    ... as you proposed.
    BUT - LZ77 works that way it replaces ... data. So, generally speaking, the LZ77 is not good choice. Still ...
    The difference is that LZ77 has sequential access to data ... which used kind of dictitonary compression.
    The purpose of ...
    Fikee Fikee January 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... ;607054]I've written an LZ77 en/decoding routine as I ... its intended purpose of data compression.

    I was looking ... long).[/QUOTE]

    Typically, LZ77 algorithms uses 1 bit to ... more. You'll only get compression if most of your data ...
    Metalbrain Metalbrain March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    This is interesting,

    I am curious as to why LZ77 and not an RLE based encoding / decoding format, the reason I ask is because I have found RLE to be one of the better compression methods on limited (RAM / CPU Power) systems.
    Zetr0 Zetr0 March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... am curious as to why LZ77 and not an RLE based ... compression methods on limited (RAM / CPU Power) systems.[/QUOTE]

    LZ77 ... you have the sequence: ABCDABCDABCDABCD, LZ77 will compress it (and RLE ...
    Metalbrain Metalbrain March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... technique to speed up LZ77 or LZSS compression is to write the ... the characters. ( [i]The Data Compression Guide[/i] )[/quote]

    compression was -53%, which is pretty ... it's getting efficient text compression which is more of a ...
    Battle Bunny Battle Bunny March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... some stats for the WIP-LZ77 routine; a SCREEN$ on the ... .

    Improving the text compression is more of a problem ... 6914 722 1912 2513
    Compression: -59% Compression: -24%
    [/code]
    Battle Bunny Battle Bunny March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... although still based on the LZ77 algorithm) and now I've ... size text file (-40% compression); unpacking just takes less than ... few ideas on improving the compression (eg. increasing the window ... up further, as improving the compression will slow it down again ...
    Battle Bunny Battle Bunny March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... 34secs @ -58%, which gets the compression back up to around what ... /> --

    Got the SCREEN$ compression down to 15secs @ -56% just ... .uk/~jg27paw4/pourri/wip-lz77.zip]WIP-LZ77[/url]. I've added ...
    Battle Bunny Battle Bunny March 2012 Development
  • House of Hell gamebook conversionAs there's potentially several people working on this I thought that I'd set up a thread in the correct section, rather than it continuing in Wanted …

    ... writing a compression routine, as covered in the LZ77 thread in the ...
    Battle Bunny Battle Bunny March 2012 New game ideas
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... , so they all give 0% compression with an average for the ... , which was giving -41%/-62% compression, although that's probably due ... more deviation from the basic LZ77 algorithm; then I'll stop ...
    Battle Bunny Battle Bunny March 2012 Development
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... /~jg27paw4/pourri/wip-lz77.zip]WIP-LZ77[/url] for reference. Compression ratios are ... features to get the extra compression (doubling the window size from ... more interested in improving the compression.

    By "stepped comparative ...
    Battle Bunny Battle Bunny April 2012 Development
  • Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …

    ... a Spectrum, as the aplib compression routines don't, and the ... .uk/~jg27paw4/pourri/wip-lz77.zip]WIP-LZ77[/url], based upon LZW ...
    Battle Bunny Battle Bunny November 2012 Development
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ... LZ77 only, i.e. it always provides the best possible compression ... for the LZ77 method according to ... format. However LZ77 is not always the best compression method, other ... well in most cases for LZ77, but other formats may ...
    Einar Saukas Einar Saukas December 2012 Brand new software
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ... optimal LZ77 only, i.e. it always provides the best possible compression ... for the LZ77 method according to the ... format. However LZ77 is not always the best compression method,[/QUOTE]
    Ralf Ralf December 2012 Brand new software
<1234567…34>

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  • Text compressionI'm sure I remember seeing a short machine code routine published in a (very random) multi-machine listings magazine way back in the mists of time, w…
  • New compression method: Exomizer 2After I finished working on optimizing aPLib's decoder, I was told that pucrunch did compress better, and while looking for info about pucrunch (it t…
  • Simple text compressionI just checked one idea about text compression. Do not take it as recomendation but rather as info which can you save some time when you are solving …
  • packers / crunchers and general compressionI'm just curious where I would find such things, coming from a c64 background also , there is shedloads.<br /> <br /> I mean the obvious things like …
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
  • Z80 internal compressionThis isn't exactly a ZX Spectrum problem, but since WOS probably has some of the best Z80 coders in the world, I thought I might ask anyway.<br /> <b…
  • Grammar-based data compressionI'm working on a game for the 48k Spectrum but want a way to compress a lot of screens into a small space, so I'm looking into data compression. Each…
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