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<1234567…34>
  • 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
  • Z80 compressorIs there one available? Is it any good? Peeps have been suggesting we should look into this, so here's a new thread! I'd do the compressor on the …

    ... compo and has amazing compression ratio and very compact ... about 4KB with relatively small entropy (hard to compress), and ... 1KB/sec.) and especially compression were not priorities. The algorithm ... br />
    The pmc compression algorithm first applies an LZ ...
    Paolo Ferraris Paolo Ferraris May 2010 Development
  • space optimisation algorithm neededScenario: * An adventure game consists of a series of locations, each of which may or may not have some text and/or graphics associated with it. * A…

    ... way too far to discuss compression techniques here, but here are ... ) small images usually have more entropy (more distinctive features), and therefore ...
    Timmy Timmy 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.…

    ... ;609145]
    Improving the text compression is more of a problem ... /> I read once that the entropy in english text was about ... a very specific beast for compression. You can do things like ...
    Gedlion Gedlion 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 …

    ... , since it will increase entropy (thus reduce compression) without producing many zeroes ...
    Einar Saukas Einar Saukas January 2013 Brand new software
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... empty characters also help improve compression.

    [QUOTE=Gedlion; ... some "entropy noise" inside the pixels sequence, thus affecting secondary compression. Perhaps ... suggestion is basically bit-based entropy compression, where most common sequences of ...
    Einar Saukas Einar Saukas January 2013 Development
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... suggestion is basically bit-based entropy compression, where most common sequences of ...
    joefish joefish January 2013 Development
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... some "entropy noise" inside the pixels sequence, thus affecting secondary compression. Perhaps ... same data, which a secondary compression system might dictionary.
    < ... suggestion is basically bit-based entropy compression, where most common sequences of ...
    Gedlion Gedlion January 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... my future adventures in de/compression easier to deal with!
    entropy encoding), so there's no ...
    stephenw32768 stephenw32768 September 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... -oriented LZ compressor with no entropy encoding)[/QUOTE]

    Not ... -based format that provides better compression and allows a smaller decompressor ... this safety offset during the compression process, or write a separate ...
    Einar Saukas Einar Saukas September 2013 Development
  • SPIN Public Beta 0.1b Available for downloadHi all, back again, and as just recently announced on CSS, SPIN has been updated. Here's the post to CSS (or the relevant parts): It's been a bu…

    ... saving.
    Fixed Z80 block compression
    Fixed a paging bug ...
    Dunny Dunny May 2002 Emulators
  • Super Wonder Boy in MonsterlandI have just noticed some graphics differences in the screenshots of the game as it was reviewed into Crash magazine. [url="ftp://ftp.worldofspectru…

    ... the artifacts of the jpg compression might misleading me to assumsions ...
    Anestis Anestis April 2003 Games
  • Basic Compilers and My Compressor CodeAs I mentioned in another thread I'm currently writing a set of compression routines for saving +3 disk space. I've done the first stage (write the …

    ... currently writing a set of compression routines for saving +3 disk ...
    BuzzinRich BuzzinRich September 2003 Sinclair Basic
  • 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…

    I'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, which compressed the text in the screen so more characters could be fitted onto one line - giving the same ...
    The Mighty Dopethrone The Mighty Dopethrone October 2003 Games
  • The biggest map everI created a map for Nonterraqueous 1 and I can truly say that it is the biggest map, which I have ever produced - 6144 x 7392 pixels, 45MB (BMP form…

    ... pixels, 45MB (BMP format - before compression) / 703 KB (PNG format - after ... compression). This game offers an unbelievably ...
    Pavero Pavero December 2003 Games
  • EmuZWin version 2.3 Final release. To be continued...This is the Final release of the version 2.3, but hope version 2.4 will be ready soon, with great new features added... Version 2.3 Release 1.99 (15…

    ... Junker), which uses the same compression which is used in popular ... it is possible to turn compression off for saving new EZX ...
    Vladimir Kladov Vladimir Kladov March 2004 Emulators
  • virtual ZX party - send Your works!!!! :)Hi there! Below You can find rules of virtual ZX party - ANTIQUE TOY 2004. Read it and send Your works to e'mail addresses contained in the rules…

    ... -ZX format with lossless
    compression. Organizers don't take any ...
    Yerz Yerz March 2004 Sinclair Miscellaneous
  • KEEP THE SPECCY ALIVE ;)I just would like to remind You, that there is virtual competition for zx-music and zx-graphic. Don't be lazy, don't wait anymore, but send Your wo…

    ... -ZX format with lossless
    compression. Organizers don't take any ...
    Yerz Yerz April 2004 Sinclair Miscellaneous
  • CSW file reading DLLMy csw.dll file is used by Electrem Future but it could be used by any Windows program. Are any emulator authors interested in using it? Csw files …

    ... using it? Csw files have compression which is not easy to ...
    Fraser Fraser July 2004 Emulators
  • Announce: EmuZWin 2.5 Release 2.2 Post-FinalEmuZWin Version 2.5 Release 2.2 post-FINAL (16-Oct-2004): [-] A small pause added between TAP blocks while loading tape from .TAP image (otherwise s…

    ... (though TD0 is saved without compression).
    [+] LoadZX.dll and LoadSP ...
    Vladimir Kladov Vladimir Kladov October 2004 Emulators
  • Compressed Loading ScreensHi everybody From my speccy memories I could swear I could remember games with loading screens that took less than normal time to load. But up until…

    ... : Thanatos! Its screen has a compression rate of two thirds! You ... ? Also, any idea of what compression methods were used?

    Erlstoned Erlstoned November 2004 Sinclair Miscellaneous
  • Compressing SCREEN$Guys I'm trying to find an MC type-in routine for the 48K which compressed the screen (including attributes) into an area of memory and also restored…

    ... memory and also restored said compression back to screen area. Any ...
    choccy48K choccy48K November 2004 Development
  • Maps made easyHi don't know if this has been suggested before (didn't find much in a search). I've come up with a nifty method for making maps and removing the unn…

    ... options and turn off Z80 compression under the
    snapshots section ...
    zster zster January 2005 Games
<1234567…34>

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Related Threads

  • 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 …
  • 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…
  • 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 …
  • Real Time TAP to OTLA/K7ZX Compression Android AppDoes anybody know of an Android app that could do OTLA/k7zx in real time?<br /> <br /> I'd like to hook my Android tablet to my spectrum and load m…
  • 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…

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