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<1234567…34>
  • Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …

    ... />
    I have used a look up table for the char address, and ... , dont let this get messed up


    LD ... and add offset based on pixel position of ycar
    ... /> LD HL,0FE00H ;BUILDING UP A TABLE WITH
    LD BC, ...
    robpearmain robpearmain September 2004 Development
  • Preferred way of determining Y co-ord in assembly?I know of 2 ways of calculating the y-cord of a pixel row for the speccy in assembly. One is to calculate the address by ways of shifting and masking…

    ... the y-cord of a pixel row for the speccy in ... a look up table I suppose that holds the Y address of each pixel ... y co-ord of a pixel row efficiently? It would be ...
    Arjun Arjun July 2007 Development
  • Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …

    ... doesn't require an address look-up table. In doing this we need ... it is closest, and the pixel line upon which it falls ... significant bits which determine the pixel position. The instruction AND 56 ... cells are further divided into pixel lines 256 bytes apart, so ...
    Jagd Tiger Jagd Tiger April 2014 Development
  • IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…

    ... /> I have also created a look up table for the "xpos" gfx offset ...
    ; based as opposed to pixel based system

    ; ********************************************< ... /> ld hl,0FE00h ;Building up a table with
    ld bc,0FDh ...
    robpearmain robpearmain August 2004 Development
  • Optimisation Needed! Is this the Fastest way to copy bytes from screen and back again?I have the screen address (say 0,0 i.e 16384) I want to copy 4 bytes wide by 32 bytes high from the screen to an area of memory. I then want to cop…

    ... of DOWN_HL code (two pixel step, maybe smart look-up table)

    but ...
    Fikee Fikee December 2005 Development
  • Preferred way of determining Y co-ord in assembly?I know of 2 ways of calculating the y-cord of a pixel row for the speccy in assembly. One is to calculate the address by ways of shifting and masking…

    ... a look up table I suppose that holds the Y address of each pixel ... HL
    FAST: LD H,TABLE/256 ; 2 / 7
    ... another 192 bytes table 64 bytes later, at TABLE+256.
    ... byte boundary, and this table is filled with the pattern ...
    Metalbrain Metalbrain July 2007 Development
  • New game - W*H*B - Help wanted!I'm currently writing a version of Cuboid/Bloxorz for the speccy, and was hoping for a little help from the WOS folk, or anybody, in designing levels…

    ... of days to get everything up & running, along with a ... so have my back-buffer, pixel-address look-up table, and the like, so ... masked, so after a clean-up that went down from 10K ...
    bobs bobs March 2009 Development
  • shifting spriteshi. have anyone experience with shifting sprites by table ? some neat tricks ? i don't want to see complete code (really don't want, it trashes thr…

    ... for the table. Pre-shifting all your sprites to pixel positions can ... by settling for 2-pixel or 4-pixel positioning.

    ... similar to using a mirror look-up table, and having half the rows ... settled for byte or 4-pixel positioning with pre-shifted ...
    joefish joefish February 2010 Development
  • New member here. And a spider! :)Hello everyone. My name is Sekrets. I'm quite a lonely individual, searching for a digital home where I might find fellow speccy enthusiasts to adopt…

    ... put a semi-annotated source up too- [URL="http://www.angel ... 'll want to use a look up table for screen address mapping, but ... I can think of is pixel level movement for the spider ... on the ROM disassembly. Well, look no further than [URL="ftp ...
    Arjun Arjun March 2010 Development
  • Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…

    ... Character to Spectrum Screen on Pixel Boundaries
    ; Registers Used - ... ;convert the Y and X pixel values to the correct Screen ... a subroutine routine to convert pixel values into an absolute ... the loops and use a look-up table to set the Screen Addressing ...
    Turkwel Turkwel June 2010 Development
  • Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…

    ... the loops and use a look-up table to set the Screen Addressing ... Attributes because you'll end up with all sorts of colour ... sprite routine needs to be pixel based.

    On the ...
    Gedlion Gedlion June 2010 Development
  • How to Write ZX Spectrum Games As some of you may know, it has long been my intention to produce a document which explains pretty much everything I have learned - and am still lea…

    ... Pixel Positions to Screen Addresses
    Using a Screen Address Look-up Table
    jonathan jonathan October 2010 Announcements
  • Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …

    ... method is to use a look-up table - or actually 8 of them ... the combinations. You would then look-up the shift of the sprite ... 2K required by the shift table above.

    [QUOTE=climacus ... black 16x16 square moving in pixel steps around the screen - but ...
    bobs bobs January 2012 Development
  • Scrolling a mapCan someone explain in idiots terms how you scroll a map. I'm not after code as such, just an explanation of how it can be done. I'd like to scroll…

    ... (8 pixel) positioning horizontally, and pixel precision vertically. Use a look-up table of the ... at any time.

    Pixel scrolling horizontally is more tricky ...
    joefish joefish May 2012 Development
  • SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…

    ... look up each byte in the mirroring table. The timing difference can mess up ... bottom half, or every other pixel line. When you draw it ... the data through your mirroring look-up table. Whichever direction you want it ...
    joefish joefish November 2014 Development
  • bmp2scrhttps://www.youtube.com/watch?v=zsjTpFR0oYQ converted for the sam coupe by using bmp2scr can anyone help Leszek Daniel Chmielewski ideally it onl…

    ... .
    CLUT is "colour look up table". It means modifying the palette ... linear framebuffer, 2 bits per pixel (4 colours).
    "All ... control part of the colour look up register addressing, "only available ... help here".

    Look on youtube, it's got ...
    1024MAK 1024MAK September 2015 Development
  • What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…

    ... that will generate a Look Up Table of screen line addresses, ... pixel line in the display file. This sort of look up table ... requires 512 bytes for the table.


    ... or wherever you located your Look up table
    LD A,(LNUM) ...
    dmsmith dmsmith March 2020 Development
  • Fast LogsAnyone know of a fast ln function I can steal? The ROM function seems to be hideously slow. I wrote a look-up table dirty and less accurate sin func…

    ... .

    I wrote a look-up table dirty and less accurate sin ... my maths isn't quite up to writing one for natural ...
    Gedlion Gedlion March 2011 Development
  • Contended Memory woes...Hello All, An iccle problem I have and was hoping one of you fine WoSers could bail me out again... :) I've noticed that my emulator is running sli…

    ... the appropriate amount from the look up table using the t-state as ... index.

    My contended table is correct.
    My t ...
    Korinel Korinel June 2013 Emulators
  • maths help 'JSW'JET SET WILLY uses a lookup table to play the opening tune (Moonlight Sonata) this is the table [code] 34299 DEFB 81,60,51,81,60,51,81,60,51,81,…

    ... SET WILLY uses a lookup table to play the opening tune ... )

    this is the table
    [code]
    34299 DEFB ... this tune the notes go up in groups of three (1 ... first 3 notes in the table are 81 , 60 , 51
    look up table.
    ASH-II ASH-II August 2015 Sinclair Basic
  • i want to start writing my own gamesi want to start writing my own games but have no idea how. is there any downloadable dummys guides or some software that teaches u how. the only expe…

    ... I use a very handy look up table in the manual itself, LOL ...
    GBNvK GBNvK January 2004 Development
  • Help required to calculate screen addressesDoes anyone have some code that calculates the screen address one pixel below the given address ? Is it best to use a lookup table ? Any examples of …

    ... that. As long as the table does not start on an ... the second method for a look-up table in the tutorial is much ...
    dmsmith dmsmith November 2004 Development
  • If you had an I.Q of 160, you would....1) be 16 years old 2) be in U.S. 3) post 6 new boring topics everyday on a forum dedicated to a brilliant home computer of the 80's 4) have Asperger'…

    ... I can easily split it up into several segments and come ... up with the answer fairly quickly ... ... to create it's own look-up table for large numbers.

    Skarpo Skarpo May 2005 Chit chat
  • how to pass arguments from Basic to MC ?can someone explain me (or give some link) how to pass arguments from basic to machine code? i mean something like this: PRINT USR xxxxx, arg1, arg2:…

    ... the image address from a look up table...
    ...then draw the image ... - 0 is first image in table
    60 PRINT USR 30000 ...
    Kiwi Kiwi April 2006 Development
  • How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…

    ... want them cleared, in a look-up table. Then, in your main code ...
    bobs bobs July 2007 Development
  • How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…

    ... want them cleared, in a look-up table. Then, in your main code ...
    Fikee Fikee July 2007 Development
  • Vector`scan anyone give me any advice or a description of vector`s... don`t mean line drawing vector`s but directional vector`s, I think there called vector`…

    ... currently using sin and cos table`s as a way of ... tables is to use a look up table of values instead of calculating ...
    Arjun Arjun July 2007 Sinclair Basic
  • Vector`scan anyone give me any advice or a description of vector`s... don`t mean line drawing vector`s but directional vector`s, I think there called vector`…

    ... tables is to use a look up table of values instead of calculating ... ]

    I got a table of sin and cos value ...
    CKay CKay July 2007 Sinclair Basic
  • He's back......and he's got a new trick! AY Chip here. I've been away far too long. I would like to announce 'HatStand': for no adequately explored reason, I h…

    ... the high byte for a look-up table of addresses. The hardware supplies ...
    Code Monkey Code Monkey August 2007 Chit chat
  • plotting and rotating wireframesCan anyone point me to an example of plotting a (2d) shape and rotating it in basic. Unfortunately my trig was never that good and I want to get a h…

    ... , games typically replace these with look up table based functions.
    I also ... the draw function could just look like this:

    [code ...
    NotANumber NotANumber September 2007 Sinclair Basic
<1234567…34>

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