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<1…20212223242526…34>
  • Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…

    ... pleased. I now have a xor sprite that moves around with ...
    48K 48K May 2006 Development
  • 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…

    ... .

    Data compression will also be added. I ... brand new MegaLZ for LZ compression. The former, of course, ... tools to do the actual compression. Pucrunch was successfully used ... block determines the degree of compression achieved, since the decompresser ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • When did Spectrum games "jump the shark"Sorry to use that hackneyed term, but there's no easier way of putting it. Basically, during the Spectrum's commercial life (roughly 1982-1992) when…

    ... />
    And of course the compression, fitting multi disk games onto ... copy protections.

    The compression often made the originals seem ...
    Digital Prawn Digital Prawn May 2006 Games
  • Background image with SP1 and Z88DKWhat is the prefered way to place an entire (or very large) image in the background when using SP1? Should I convert it to a long (32*24=768 ) list o…

    ... is to invent your own compression format to figure out where ... achieve a decent level of compression as well.

    I ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • Background image with SP1 and Z88DKWhat is the prefered way to place an entire (or very large) image in the background when using SP1? Should I convert it to a long (32*24=768 ) list o…

    ... the display file using a compression program like MegaLZ or the ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • AvatarsCan someone tell me how to reduce the size of avatars, I've got this really ace picture of my arse but it's to big, if i can't use this picture i'll …

    ... since the patents affecting the compression algorith used by GIF have ...
    robert@fm robert@fm June 2006 Chit chat
  • Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…

    ...
    ld a,r
    xor h
    ld (seed),a ... fast operations like logical and/xor with inc/dec. Or something ... 3
    INC a
    XOR 1
    DEC a
    48K 48K June 2006 Development
  • Extracting the Multiface ROM?Is there an easy way to save the contents of a real Multiface 128 ROM to tape, on a real spectrum, for the purposes of transferring it to PC for emul…

    ... quite different - mine has no compression support, doesn't support Disciple ...
    trellis trellis June 2006 Hardware
  • Checksum RoutinesHi there everybody, Does anyone have an 'off the shelf' assembler routine for generating checksums? Thanks Jim

    I've also found this example at [url]http://wikiti.denglend.net/index.php?title=Z80_Routines:Security:CRC16[/url]

    CRC16:
    ;Borrowed from [url]http://zilog.sh.cvut.cz/~base/misc/z80bits.html[/url]
    ; and moddified to be a loop
    ; ...
    jp jp June 2006 Development
  • Loading schemes18 years ago I hated loading schemes like Alcatraz and Speedlock because they were a b*tch to copy and became unreliable when the tape got older. Now…

    ... br /> ld a,c
    xor $03
    ld c,a ... br /> lff32 rl c
    xor l
    ret nz
    ld a,h
    xor l
    ld h,a ... a,($fe)
    rra
    xor c
    and $20
    Tom-Cat Tom-Cat July 2006 Games
  • A very first computer, a very first gameMaybe i'm duplicating some other posts, but... what was your first computer and game??? For me it was a rubber zx-spectrum 48k and tape with only t…

    Xor , welcome.

    Speaking for ...
    Sard Sard July 2006 Games
  • Problem with rotating procedureHi folks! I wrote a proc in z80 asm, based on: x' = x * cos (z) - y * sin (z) y' = x * sin (z) + y * cos (z) I used a precalculated table of sin a…

    [QUOTE=xor]I used a precalculated table ...
    Alcoholics Anonymous Alcoholics Anonymous July 2006 Development
  • Problem with rotating procedureHi folks! I wrote a proc in z80 asm, based on: x' = x * cos (z) - y * sin (z) y' = x * sin (z) + y * cos (z) I used a precalculated table of sin a…

    ... ]http://www.k-ow.net/~xor/zx/x_tap.png[/url]
    xor/zx/x.tap[/url]
    xor xor July 2006 Development
  • ZXLFN - storing tape header in a long file nameHi lads ;) Couple of months ago, the group of guys interested in divIDE software development has came up with an interesting idea - store tape heade…

    ... via simple:

    LOOP: xor (hl)
    cpi
    jp ...
    baze baze July 2006 Emulators
  • Prince of Persia in an actual Spectrum?Prince of Persia is one the best games programmed for our Speccy in the last 10 years, but I think originally was written for TR Dos, although there …

    ... drive. Anything smaller would require compression and adding support for disk ...
    Jmk Jmk July 2006 Games
  • Prince of Persia in an actual Spectrum?Prince of Persia is one the best games programmed for our Speccy in the last 10 years, but I think originally was written for TR Dos, although there …

    ... drive. Anything smaller would require compression and adding support for disk ... is about 200k. Maybe with compression you can make +3 disc ...
    nekdo123 nekdo123 July 2006 Games
  • Prince of Persia in an actual Spectrum?Prince of Persia is one the best games programmed for our Speccy in the last 10 years, but I think originally was written for TR Dos, although there …

    ... is about 200k. Maybe with compression you can make +3 disc ... did do one that involved compression and support for disk flipping ...
    Jmk Jmk July 2006 Games
  • Prince of Persia in an actual Spectrum?Prince of Persia is one the best games programmed for our Speccy in the last 10 years, but I think originally was written for TR Dos, although there …

    ... did do one that involved compression and support for disk flipping ...
    nekdo123 nekdo123 July 2006 Games
  • Problem with rotating procedureHi folks! I wrote a proc in z80 asm, based on: x' = x * cos (z) - y * sin (z) y' = x * sin (z) + y * cos (z) I used a precalculated table of sin a…

    Xor:
    As for fast math... ...
    baze baze July 2006 Development
  • In Machine Code, what is the quickest way to sort bytes?I am playing around with some ordering of sprites, where I want to order them by vertical position. I used some Rodnay Zaks code to order some bytes…

    ... /> Yes :)

    [CODE]
    xor a
    ld l,256 ...
    baze baze August 2006 Development
  • In Machine Code, what is the quickest way to sort bytes?I am playing around with some ordering of sprites, where I want to order them by vertical position. I used some Rodnay Zaks code to order some bytes…

    [QUOTE=icabod]
    Of course that doesn't quite work in z80 asm, but I like to be picky. Hoorah![/QUOTE]

    Easily fixed:
    [CODE]a = a XOR b
    b = a XOR b
    a = b XOR a[/CODE]
    AndyC AndyC August 2006 Development
  • In Machine Code, what is the quickest way to sort bytes?I am playing around with some ordering of sprites, where I want to order them by vertical position. I used some Rodnay Zaks code to order some bytes…

    ... 1st value into a
    xor c ; merge with 2nd value ... result in 1st value
    xor c ; restore to 1st value ... merged 1st/2nd values
    xor c ; remove 1st value
    Kiwi Kiwi August 2006 Development
  • In Machine Code, what is the quickest way to sort bytes?I am playing around with some ordering of sprites, where I want to order them by vertical position. I used some Rodnay Zaks code to order some bytes…

    Sadly, no XOR version is shorter than simple: ld c,a; ld a,b; ld b,c :)
    baze baze August 2006 Development
  • In Machine Code, what is the quickest way to sort bytes?I am playing around with some ordering of sprites, where I want to order them by vertical position. I used some Rodnay Zaks code to order some bytes…

    [QUOTE=baze]Sadly, no XOR version is shorter than simple: ld c,a; ld a,b; ld b,c :)[/QUOTE]
    hehe, so true!
    And that ladies and gents bring us full circle back to the start. :)
    Kiwi Kiwi August 2006 Development
  • Spectaculator QuestionsI've been messing around with this great emulator, and was surprised how easy it was for me to load a game from minidisc into Spectaculator as if it …

    ... a custom loading routine and compression/tape schemes that are generated ...
    Dunny Dunny August 2006 Emulators
  • Spectaculator QuestionsI've been messing around with this great emulator, and was surprised how easy it was for me to load a game from minidisc into Spectaculator as if it …

    ... conclusively that minidisc's ATRAC compression does not affect the ability ...
    Spector Spector August 2006 Emulators
  • Crazy Spectrum Experiments. Now there?s a thought!!As a Kid I wanted to be a budding inventor and tried all sorts of things with my speckie. I remember buying a second hand reel to reel tape recorde…

    ... rate was lower that the compression of the audio may have ...
    Scottie_uk Scottie_uk August 2006 Sinclair Miscellaneous
  • Games reset sinclair 48k.I am a relative newbee to these forums and indeed spectrum emulation. I have been acquiring audio such as wavs or mps of games I own and am trying to…

    ... main program.

    FLAC compression level 1.
    Size 2 ... a) FLAC gives the best compression of audio-format type files ...
    Laser Laser September 2006 Emulators
  • Games reset sinclair 48k.I am a relative newbee to these forums and indeed spectrum emulation. I have been acquiring audio such as wavs or mps of games I own and am trying to…

    [Quote]
    FLAC compression level 1.
    Size 2. ... file... so.

    CSW2 compression:
    Size 92kb. Effective "bit ... -rate" unknown, due to the compression employed.
    Loads perfectly! :grin ...
    Dunny Dunny September 2006 Emulators
<1…20212223242526…34>

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