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  • Best place to start learning assembly on WOS ?So I'm pretty new at this forum but not the Speccy so my BASIC is pretty good. I can see lots of resources on WOS for doing machine code/assembly but…

    ... , masks and byte-packed data structures.

    Octal - Spectrum attribute values ...
    GReW GReW October 2016 Development
  • ZX GameDev tools consolidatedHello WoS! It's been a while, yet with a plenty of decent gamedev tools (including new ones!), is there a [i]single/pivot table[/i] or some datash…

    ... individually to a 8/9 byte back buffer which is then ... the top border before the attribute updater synchronizes with the raster ...
    Alcoholics Anonymous Alcoholics Anonymous January 2017 Development
  • Comp.Sys.Sinclair Crap Games Competition 2017As the creator of the second-least crap game in last year's competition (and the only mug stupid enough to agree to host it this year) I am proud/ash…

    ... itself. Both listings do simple attribute-based scrolling, either vertically or ... the buffered screen completely to attribute 0 (black).

    Note ... 22 bytes of each 32 byte strip are used, to fill ... after (and add to the byte count in 9140) to POKE ...
    joefish joefish January 2017 Games
  • Project: ZX OpusHello my friends, I have been in need of a push lately so I thought if I post some of the work for this project here you guys (and gals) can help me …

    ... one pixel (and one byte in the attributes area ... attributes, the 16-bit attribute address is constructed from this ... means "character Y,X to attribute address". The function "asm_zx_cyx2saddr. ... second one sometimes leaves attribute gaps in the rendered ...
    Alcoholics Anonymous Alcoholics Anonymous March 2017 Software
  • Graphics extrcation QIs there an easy way to extract all graphics from a game. E.G manic miner. I want to rip out out all the 'sprites' and blocks etc not the title sc…

    ... .
    The items are one byte wide and 8 pixels high ... .
    The blocks are one byte wide and 8 pixels high ... is preceded by an additional byte of attribute data.
    GReW GReW March 2017 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…

    ... br /> ;;
    ;; get control byte
    ld a,(hl) ; ... 5bits of 1st byte combined with a 2nd byte
    // ... /> store_c=store; // control byte pointer -> start of storage ... control byte
    }
    *store_c=(mlen.r[0] attribute, then ...
    TomD TomD April 2017 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…

    ... compression ratio as, generally speaking, attribute values tend to have little ... were doing it all in 'attribute space' (linearly). The 0~ ... copy >31 literals - 0 byte impact
    having length > ... ;256 - 0 byte impact. I've tested this ...
    TomD TomD April 2017 Development
  • ZX-Paintbrush and global palette and ula+ supportHello, I think I need some help for the palette issue of ZX-Paintbrush. I want to check whether the way I'm about to clear the palette handling i…

    ... is to remove the additional byte row at the end of ... 'plain ZX Spectrum 768 bytes' attribute format, roughly speaking. It shouldn ...
    Hikaru Hikaru May 2017 Software
  • Requesting permissions from authors!!![url="http://spectrumcomputing.co.uk/"]Spectrum Computing[/url] is currently hosting ZXDB, however it has chosen to only distribute files after obtai…

    ... copy of each pixel byte and corresponding attribute into an internal memory ...
    Einar Saukas Einar Saukas August 2017 Announcements
  • KLIK: Z80 snapshot to screenshot converterWith most Spectrum emulators, you can save current game screen in original ".SCR" format. This will give you a 100% perfect copy of the Spectrum scre…

    ... to remember each pixel byte and corresponding attribute that was read during ...
    Einar Saukas Einar Saukas August 2017 Announcements
  • KLIK: Z80 snapshot to screenshot converterWith most Spectrum emulators, you can save current game screen in original ".SCR" format. This will give you a 100% perfect copy of the Spectrum scre…

    ... to remember each pixel byte and corresponding attribute that was read during ... . You'd have the pixel/attribute layout and a bitmap of ...
    AndyC AndyC August 2017 Announcements
  • KLIK: Z80 snapshot to screenshot converterWith most Spectrum emulators, you can save current game screen in original ".SCR" format. This will give you a 100% perfect copy of the Spectrum scre…

    ... to remember each pixel byte and corresponding attribute that was read during ... . You'd have the pixel/attribute layout and a bitmap of ...
    Einar Saukas Einar Saukas August 2017 Announcements
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... are correct but duplicated, and attribute bytes have (as described) bit ... /> P: 1 if pixel byte, 0 if attribute
    X: character 1 ...
    Hikaru Hikaru September 2017 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... try picking a deliberately ridiculous attribute value with e.g. flash ... get two attribute bytes in succession. Otherwise, an occasional bitmap byte slips ...
    Ast_A_Moore Ast_A_Moore September 2017 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... (not from the first screen byte), although the numbers are otherwise ... 'empty' zones between the bitmap-attribute combinations, and the value of ...
    Hikaru Hikaru September 2017 Development
  • Hacking the ZX Spectrum 48K ROMHi Guys, I have modded my Speccy with a dual boot ROM loading on first bank the original ZX kernel and on the second bank an enhanced version. I h…

    ... problems just by changing initial attribute values except possibly any games ... are packed into the same byte:
    [code]
    Bit 7 ... the ROM as a 768 byte (96 characters of 8 rows ...
    GReW GReW November 2017 Hardware
  • Other than using attributes what other ways to detect collisions, when using char based movement?So I'm slowly working out the bits and pieces to write a game completely in assembly. I've been using attributes when writing in BASIC to detect whet…

    ... number in a high byte and shift it 3 ... to shift the high byte right whilst repeating its ... [/u], which rotates a byte within intself. 'RR x ... add hl,bc ;Add to attribute address

    ... a,(hl) ;Get value from attribute address

    ...
    joefish joefish November 2017 Development
  • Other than using attributes what other ways to detect collisions, when using char based movement?So I'm slowly working out the bits and pieces to write a game completely in assembly. I've been using attributes when writing in BASIC to detect whet…

    ... co-ordinate in the high byte B and set C to ... know you've got one byte per character, and you don ... background; you just set the attribute, then add the difference between ... actually look like or what attribute colour they are. Then you ...
    joefish joefish November 2017 Development
  • Fast Binary to Text DisplayI've done this thing that takes some memory contents and converts it to a Binary version of 0's and 1's on screen. However, I've no idea what to use …

    ... the bitmap area and the attribute area. As far as ... $5aff. Visually, however, the attribute area starts at address $5800 ... and check when the high byte (register D) reaches the ... the address of the byte one line down, we ... one to/from the high byte. In this example, ...
    Ast_A_Moore Ast_A_Moore December 2017 Development
  • Please, convert your game to EP128The Enterprise is a Zilog Z80-based home computer first produced in 1985. It can simulate the specy screen, so most of the EP128 game is specy conver…

    ... , and the attributes, because the attribute is working different on Enterprise ... program needs only a 16 byte long header the code after ...
    Geco Geco January 2018 Brand new software
  • im looking for other games like the muncher that use double height and width graphics with colouri havent come across this type of graphics mode on the spectrum before and would like to know if there are any other games that use it.

    ... 8 horizontal pixels takes a byte however you do it, and ... and there isn’t any attribute clash at all. That’s ...
    colonel32 colonel32 June 2019 Games
  • Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…

    ... grabs a byte of pixel data and a byte of attribute data. It ... doesn't remember the attribute bytes ... you can update is one byte every 8 clock cycles. So ... it as possible into the attribute data while the beam is ...
    joefish joefish August 2019 Development
  • Fastest emulator screen renderingHi, I'm developing an algorithm for fast emulator screen rendering and here is what I came up with. 1) Use 4bpp indexed image format as target …

    ... , more than 2 colours per attribute square.[/quote]

    The ... returns the contents of last byte that the ULA read from ...
    Dunny Dunny November 2019 Development
  • Bit of fun - ToastRack , one change onlyAlthough there's an old "one change only" topic about, I was thinking about the toastyrack 128's earlier. Its actually the only Spectrum model I've n…

    ... />
    Currently we have one byte per 8x8 block of pixels ... consider this, instead of the attribute block being 8x8 , it could ...
    spider spider November 2020 Hardware
  • Paging for 64Kb of Video Ram??? What is the best way to page this?Hi all, I'm just putting together a concept card for a "Loki" style of video card, which supports shadow ( so it fits a normal Speccy ) and also t…

    ... modes though with two pixels/byte means that the data rate ... 7MHz, and only doubles for attribute modes and high resolution modes ...
    cj7hawk cj7hawk October 2021 Hardware
  • Fighting Warrior's protection systemThis is one of those bizarre cases where cracking the loading system is orders of magnitude more fun than playing the game. (Indeed, discovering I wa…

    ... cell followed by 1 byte for the attribute. This allows the screen ...
    Luny Luny October 2021 Games
  • Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…

    ... x 192 x 8-8-Attribute.
    256 x 192 x ... colour with 2 pixels per byte

    Also, 512 x ...
    cj7hawk cj7hawk October 2021 Hardware
  • How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…

    ... you say it is an attribute, ink 5, paper 2 bright ... suspect.[/quote]

    The attribute doesn't change. It's ... no longer #55 in the byte immediately after the text.
    Kotek Kotek July 2022 Development
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