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<1234567…34>
  • Manipulating attributes...Hi Folks, I have written a routine that allows a blue bar to be scrolled up and down a list to select an item. Each item in the list occupies two l…

    ... />
    To allow the original attributes to be restored I take ...
    Paddy Coleman Paddy Coleman November 2010 Sinclair Basic
  • Storing and displaying attributes...Hi Folks, I have a requirement to store and then redisplay a line of attributes from the screen. For example: 100 DIM a$(1,32) 110 LET line=10 120…

    ... then redisplay a line of attributes from the screen. For example ... the ability to restore the attributes in some way - another USR ...
    Paddy Coleman Paddy Coleman June 2011 Sinclair Basic
  • Fast and easy read/write of attributes?What are the fastest or easiest ways to check the attributes of tiles on the screen, in BASIC? It seems to be a great way of storing object info. …

    ... easiest ways to check the attributes of tiles on the screen ... ATTR, allowing me to apply attributes to the screen?
    Is ...
    Dock Dock June 2014 Sinclair Basic
  • Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…

    ... brightness level of non-bright attributes on classic ZX 48? Was ...
    moroz1999 moroz1999 September 2016 Hardware
  • "ZX80 Brain" RPN CalculatorIt is at times like [url=https://www.worldofspectrum.org/forums/discussion/54176/depression]when threads such as this are posted[/url] that I get the…

    ... the display file where the attributes are held. It may seem ... as the result of a calculation, d and e are both ... hold the result of a calculation before the stack is moved ...
    The Mighty Dopethrone The Mighty Dopethrone March 2017 Sinclair Basic
  • 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…

    ... assembly. I've been using attributes when writing in BASIC to ...
    ivanb303 ivanb303 November 2017 Development
  • Bubble Bobble EditI thought I might have a go at editing Bubble Bobble myself after reading this... [url]http://www.worldofspectrum.org/forums/showthread.php?t=15452[…

    ... levels the resultant column/row calculation is ever so slightly different ... catapults it out of the attributes area. It just so happens ...
    Mr. Anonymous Mr. Anonymous April 2007 Development
  • another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)

    ... 25 rows) with 50 bytes attributes, thus losing just 6 bytes ... [B]both[/B] raster and attributes) become simple inc/dec instructions ... screen. And the initial address calculation in bitmap and vector routines ...
    TVzombie TVzombie January 2008 Games
  • Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …

    ... br /> ld hl, colour_map ; set attributes
    ld de, colour_map + ... the carry flag before
    ; calculation
    sbc hl,de ; ... bc, 2048 ; offset to character attributes
    add hl, bc ; ... doesn't try to print attributes
    ; outside the ...
    chev chev May 2009 Development
  • Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…

    ... ,7 ; Value to write to attributes

    atr ld (hl ... ),d ; Write 7 to attributes
    inc hl ; Next attribute ... as data to show address calculation).


    lpt defw ...
    ASM ASM October 2010 Development
  • Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…

    ... ,7 ; Value to write to attributes

    atr ld (hl ... ),d ; Write 7 to attributes
    inc hl ; Next attribute ... as data to show address calculation).


    lpt defw ...
    sekrets sekrets November 2010 Development
  • Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…

    ... ,7 ; Value to write to attributes

    atr ld (hl ... ),d ; Write 7 to attributes
    inc hl ; Next attribute ... as data to show address calculation).


    lpt defw ...
    ASM ASM November 2010 Development
  • Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…

    ... them, ie to have two attributes per cell, or bigger screen ... /> I'm not sure two attributes per cell would be particularly ... fast and having 8x4 colour attributes rather than 8x8 doesn't ... /> It may make screen address calculation (not a slow operation at ...
    AndyC AndyC February 2011 Sinclair Basic
  • Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…

    ... 'm not sure two attributes per cell would be ... ]and having 8x4 colour attributes rather than 8x8 doesn' ... simpler vertical movement (including the attributes).

    But ... marginally quicker[/QUOTE]
    Address calculation for the spectrum screen is ...
    TVzombie TVzombie February 2011 Sinclair Basic
  • Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…

    ... by means of a simple calculation realised in hardware, then changing ... reason for chosing a 'simple calculation' in hardware is that two ... /> - address calculation is very simple for both raster lines and attributes
    TVzombie TVzombie February 2011 Sinclair Basic
  • SE Basic Type-ins^Pete suggested creating a sticky thread for SE Basic discussion. I thought a Type-ins thread might also be useful. Up to the mods if they want to ma…

    ... the carry flag before
    ; calculation
    sbc hl, de ; the ... af ; relevant address in the attributes file from a
    ld ...
    chev chev April 2011 Sinclair Basic
  • Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…

    ... run faster by doing this calculation outside the critical section, using ... ][/URL]

    Observe the attributes at the end of the ...
    Timmy Timmy May 2011 Sinclair Basic
  • Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…

    ... the carry flag before
    ; calculation
    sbc hl, de ; the ... the
    ld a, d ; attributes file from a given display ...
    chev chev May 2011 Sinclair Basic
  • Games featuring... relevant bugsThere was a recent improvement to the WoS database in order to classify [URL="http://www.worldofspectrum.org/forums/showthread.php?t=34261"]Games fea…

    ... tables of screen data & attributes; each pass round the inner ... for its attribute. The precursor calculation of SP sometimes overflows $FFFF ... worked out whether its the calculation which is wrong or the ...
    Battle Bunny Battle Bunny July 2011 Infoseek database
  • 40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…

    ... the carry flag before
    ; calculation
    sbc hl, de ; the ... the
    ld a, d ; attributes file from a given display ...
    chev chev August 2012 Development
  • Finders Keepers+I know a few of you are interested in this project so I thought it was about time I started a proper thread for it rather than just slipping bits int…

    ... a 'back of the envelope' calculation for my ideal new maze ... fast if if I used attributes and kept it as a ...
    David Jones David Jones September 2013 Development
  • Pac-Land: can be coloured?All versions of this game are full coloured, but not the Spectrum version. It has large sprites, but maybe the scroll is too fine to make a coloured …

    ... hack code which shows original attributes.

    As I said ... as atribute buffer
    ;easy calculation: tile buffer starts at 23296 ...
    Ralf Ralf January 2014 Games
  • Pac-Land: can be coloured?All versions of this game are full coloured, but not the Spectrum version. It has large sprites, but maybe the scroll is too fine to make a coloured …

    ... location and need to update attributes
    RET NZ ;otherwise ... don't draw attributes again

    ;paint attributes
    XOR ... extra code
    ;easy calculation: tile buffer starts at 23296 ... )
    ;hack it so attributes are also extracted
    ; ...
    Ralf Ralf February 2014 Games
  • Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…

    ... routine does not transfer the attributes, although plonking a couple of ... by 32
    rlca ; net calculation: multiply by 4
    and ... /> ld e, a ; vertical coordinate calculation done
    ; add the horizontal ...
    polomint polomint April 2014 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…

    ... about compressing pixels and attributes separately and using two ... zeros or something, but attributes typically pack well together ... and making for simpler address calculation for relative offsets. About ... for both pixels and attributes, as if you were ...
    Hikaru Hikaru 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…

    ... about compressing pixels and attributes separately and using two ... zeros or something, but attributes typically pack well together ... and making for simpler address calculation for relative offsets. About ... for both pixels and attributes, as if you were ...
    TomD TomD April 2017 Development
  • How to improve my program using oversized numbersI'd like my dice program to print out the number four times bigger than normal if possible. Anyone know how to do this? Or I could write a sub rou…

    It's scrolling the attributes, not the display, so it' ... !"
    and then change the calculation for the 'x' modifier in ...
    Battle Bunny Battle Bunny July 2017 BASIC
  • Max RAM for ZX Spectrum gamesHow much RAM can be used for single level/whole game? On tape writing.

    ... /> Just imagine piano, or some calculation only, with result put directly ... />
    Another option - use only attributes for output, thus way 6144 ...
    Bedazzle Bedazzle October 2022 Development
  • printer port redirect to (Windows) system printerIs there any emulator (+2A/+3 compatible) that can be configured to output the, say, parallel printer port to the Windows system port ? The default o…

    ... COPY EXP (screen dump, including attributes) to a .PDF file.
    secarica secarica November 2002 Emulators
<1234567…34>

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