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<1234567…34>
  • 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…

    ... colors games (with GFX Screen XOR buffer turned on, actually seems ... (though TD0 is saved without compression).
    [+] LoadZX.dll and LoadSP ...
    Vladimir Kladov Vladimir Kladov October 2004 Emulators
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... pathological intersection cases.
    - data compression has not yet been added ... minor variations on MASK,OR,XOR,LOAD but offering some relative ...
    Alcoholics Anonymous Alcoholics Anonymous April 2006 Development
  • XOR - dodgy magazine referenceThe magazine reference section for Logotron's XOR has a link to a Spanish(?) magazine 'MicroHobby Especial'. All well and good, but the magazine arti…

    The magazine reference section for Logotron's XOR has a link to a Spanish(?) magazine 'MicroHobby Especial'. All well and good, but the magazine article seems to about XORing bits, rather than moving chickens and fish around a maze.
    JamesW JamesW March 2007 Infoseek database
  • 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
  • Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…

    ... .jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by ... = x ^ (x > 1)
    xor e
    ld e,a ...
    Patrik Rak Patrik Rak December 2008 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
  • AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL, RR,SRA for BASICAs this was drifting away from the original INKEY$ thread I thought that I'd create a new one. So here's a routine to provide all of the above mentio…

    ... ,b"
    ;# values: AND=A, XOR=X, OR=O, BIT=B ... ^n)
    inc b
    xor a
    scf
    SETBIT ... ,a,b"
    37 PRINT "XOR ";a;TAB 9;b,"=";USR ...
    Battle Bunny Battle Bunny October 2011 Sinclair Basic
  • 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
  • LZ4 decoderI encountered the [URL="http://code.google.com/p/lz4/"]LZ4 compressor[/URL] a few weeks ago. Reading the [URL="http://fastcompression.blogspot.co.uk…

    ... ; store in byte counter
    xor 19 ; see if it's ... LZ4 is used in "high compression" mode. The LZ4 decompressor is ...
    stephenw32768 stephenw32768 October 2013 Development
  • Vertical XOR filler.. anyone?Hi, I was just wondering whether a vertical filler using XOR has ever been used on Speccy demos/games and if yes when for the first time? Just tryin…

    Hi,

    I was just wondering whether a vertical filler using XOR has ever been used on Speccy demos/games and if yes when for the first time? Just trying to find some references..
    mr.spiv mr.spiv February 2015 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
  • ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…

    ... /> // uses a modified LZF compression
    // (https://en.wikibooks ... /> // create store for compression, allocate full 6912 just in ... allocate memory to store compression\n");
    fclose( ... br /> rlca ; 4t
    xor %10000010 ; 7t
    ld ...
    TomD TomD April 2017 Development
  • XOR screenshotsXOR from 1987 is missing the loading screen and the in-game screen, Xor from 1990 has the in-game screen from another game.

    XOR from 1987 is missing the loading screen and the in-game screen, Xor from 1990 has the in-game screen from another game.
    Art Art July 2017 Infoseek database
  • 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
  • Vedic Maths Trick!So you don't have to learn your 11 times table. For any 2 numbers multiplied by 11, add them together and insert the answer between the multiple dig…

    ... functions like XOR, AND and OR used. As well as compression and ...
    FrankT FrankT December 2007 Chit chat
  • 3d vector graphicsAny1 know where to get source code for 3d vector graphics coord calculation , polygon filling , rendering priority etc etc.. thanx

    [QUOTE=Xor a;309936]i used the ... /> Where did you get the compression algorithms their awesome
    its ...
    LCD LCD October 2008 Development
  • Z88DK/SP1 library u_malloc() questionHi All, It may possibly be more appropriate for me to post this on the Z88DK forum, but I know quite a few WoSSers have used Z88DK, so here goes:- …

    ... />
    [QUOTE]2. Suitable data compression for sprites and level data ... believe that music need some compression, but since complete songs ... am already looking at huffman compression and decompression as a ... to shift many sprites in xor-mode for pure speed and ...
    Timmy Timmy December 2010 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…

    ... being little benefit of using compression from a commercial standpoint, I ... 0021744]Hrust 1.3[/url], compression ratios go all the way ... using some form of internal compression (e.g. Stormlord), and ... is by computing a 8bit XOR value across all bytes comprising ...
    Hikaru Hikaru January 2011 Sinclair Miscellaneous
  • Saving space using procedural graphicsAfter spending several hours playing around with various packers to squash the Alien8 test screen$ it occured to me that maybe bigger space savings c…

    ... simple filter allow much better compression on screens with ordered dither ... 50% then maybe a simple XOR of the three bits to ... couldn't adapt. But being XOR, the same filter could set ...
    joefish joefish July 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 …

    ... may apply some filters before compression (and after decompression).

    antoniovillena antoniovillena January 2013 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 …

    ... ).[/QUOTE]

    Using RCS+XOR+ZX7 produces larger files than ... will increase entropy (thus reduce compression) without producing many zeroes.
    Einar Saukas Einar Saukas January 2013 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 …

    ... how it works:
    [CODE]Compression format "RLE7-static":


    Using these new compression algorithms, I obtained new statistics ... +XOR|XOR+ZX7| ZX7_0 | RCS |RCS+XOR| XOR |RLE7st | RCS |RCS+XOR| XOR |RLE7dyn| RCS | RCS+XOR| XOR ...
    Einar Saukas Einar Saukas January 2013 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 …

    ... , we add redundancy with the XOR: the bits lost in the ... 't work so well regarding compression either. This is the reason ...
    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…

    ... to see if that improves compression or not.

    If ... wants to try it, you XOR those three pixels and that ... are already plotted), XOR them together, then XOR with the target pixel ...
    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…

    ... scattered dots, so standard byte-compression of the result may not ... it can be applied by XOR operations.

    It also ...
    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…

    ... [/URL] and should provide better compression than simpler, more traditional RLE ... before, except each attribute is XOR'ed with the attribute from ... , because RCS reordering should improve compression even in cases where most ...
    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…

    ... , RCS format still provides better compression than LIN (linear buffer order ... to notice that a simple XOR with previous line produced almost ...
    Einar Saukas Einar Saukas February 2013 Development
<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…
  • A logic game "XOR"I am a student from Sebastopol (Ukraine), - that's why sometimes my posts may sound funny or or something like that...<br /> 8 years ago (whan I was …
  • XOR - dodgy magazine referenceThe magazine reference section for Logotron's XOR has a link to a Spanish(?) magazine 'MicroHobby Especial'. All well and good, but the magazine arti…
  • 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…
  • Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
  • 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 …
  • AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL, RR,SRA for BASICAs this was drifting away from the original INKEY$ thread I thought that I'd create a new one. So here's a routine to provide all of the above mentio…
  • 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…
  • Vertical XOR filler.. anyone?Hi,<br /> <br /> I was just wondering whether a vertical filler using XOR has ever been used on Speccy demos/games and if yes when for the first time…

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